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Bluetooth Audio Module Command Reference User's Guide

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1. 2014 Microchip Technology Inc DS50002154A page 27 Bluetooth Audio Module Command Reference User s Guide 2 2 6 SC lt 24 bit her value gt This command sets the service class field in the Class of Device COD where lt 24 bit hex value represents the COD Bluetooth master devices use the COD when scan ning for available devices to determine whether a device in a given class offers the type of service that they want The service class consists of the most significant 11 bits in the COD This command sets the MSW to create the 24 bit device class number The inquiring device interprets the service class to determine the service A complete listing of available Bluetooth ser vice classes is available on the Bluetooth SIG web site https www bluetooth org apps content The default COD 240704 represents the following device e Service class rendering audio e Major device class wearable e Minor device class wrist watch Default 240704 Example sc 240710 II Service class rendering audio Major device class wearable Minor device class helmet 2 2 7 SD lt 8 bit hex value gt This command sets the discovery mask where lt 8 bit hex value gt represents the pro files enabled for discovery The Bluetooth profiles are represented by an 8 bit hex value as shown in Table 2 5 TABLE 2 5 BLUETOOTH PROFILE BITMASK VALUES Bit Position Value Profile 0 01 iAP 1 02 SPP 2 04
2. Default RN52 Example s MCHIP Set module s name to MCHIP XXXX 2 2 3 S lt dec gt The command sets automatic shutdown on idle time in seconds 0 Feature disable on forever 1 600 seconds of idle time not connected Default 0 Example s 30 DS50002154A page 26 2014 Microchip Technology Inc Command Reference 2 2 4 S lt 16 bit hex value gt This command sets the extended features The bit mapping for the extended features is Bit 0 Enable AVRCP buttons for EK Bit 1 Enable reconnect on power on Bit 2 Discoverable on start up Bit 3 Codec indicators PIO7 AAC and PIO6 aptX Bit 4 Reboot after disconnect Bit 5 Mute volume up down tones Bit 6 Enable voice command button on PIO4 Bit 7 Disable system tones Bit 8 Power off after pairing timeout Bit 9 Reset after power off Bit 10 Enable list reconnect after panic Bit 11 Enable latch event indicator PIO2 Bit 12 Enable track change event Bit 13 Enable tones playback at fixed volume Bit 14 Enable auto accept passkey in Keyboard I O Authentication mode Default 0 Example S 0087 2 2 5 SA lt dec gt The set authentication command forces authentication when a remote device attempts to connect where lt value gt is a decimal value shown in Table 2 4 Regardless of this setting if a remote device forces authentication this device responds with the stored pin code Once a remote
3. MICROCHIP Bluetooth Audio Module Command Reference User s Guide DS50002154A Note the following details of the code protection feature on Microchip devices Microchip products meet the specification contained in their particular Microchip Data Sheet Microchip believes that its family of products is one of the most secure families of its kind on the market today when used in the intended manner and under normal conditions There are dishonest and possibly illegal methods used to breach the code protection feature All of these methods to our knowledge require using the Microchip products in a manner outside the operating specifications contained in Microchip s Data Sheets Most likely the person doing so is engaged in theft of intellectual property Microchip is willing to work with the customer who is concerned about the integrity of their code Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code Code protection does not mean that we are guaranteeing the product as unbreakable Code protection is constantly evolving We at Microchip are committed to continuously improving the code protection features of our products Attempts to break Microchip s code protection feature may be a violation of the Digital Millennium Copyright Act If such acts allow unauthorized access to your software or other copyrighted work you may have a right to sue for relief under that Ac
4. 38400 bps 04 57600 bps 05 115200 bps 06 230400 bps 07 460800 bps Default 05 Example SU 01 2 3 GET COMMANDS Get commands retrieve and display the device s stored information These commands do not have a keyword or character and do not take any parameters except as noted Commands are not case sensitive All commands respond with aox lt optional mes sage gt r n for success or ERR lt optional message gt r n if the command fails 2 3 1 D This command displays basic settings or the active configuration Figure 2 1 shows an example of the output Example D II Display basic settings Active Configuration Legend BTA Bluetooth address of the module BTAC Bluetooth address of the connected device BTName Friendly Bluetooth name of the module Authen Active authentication mode COD Class of device DiscoveryMask Active discovery mask ConnectionMask Active connection mask PinCode Assigned pin code for legacy pairing AudioRoute Active audio route DS50002154A page 30 2014 Microchip Technology Inc Command Reference AudioConfig Current audio configuration CodecsEnabled Active codecs ExtFeatures Extended features selected FIGURE 2 1 DISPLAY COMMAND EXAMPLE OUTPUT fo OR EE 2 3 2 G lt command gt This command displays the stored settings for a set command where lt command gt is the second character of a set co
5. Westborough MA Tel 774 760 0087 Fax 774 760 0088 Chicago Itasca IL Tel 630 285 0071 Fax 630 285 0075 Cleveland Independence OH Tel 216 447 0464 Fax 216 447 0643 Dallas Addison TX Tel 972 818 7423 Fax 972 818 2924 Detroit Novi MI Tel 248 848 4000 Houston TX Tel 281 894 5983 Indianapolis Noblesville IN Tel 317 773 8323 Fax 317 773 5453 Los Angeles Mission Viejo CA Tel 949 462 9523 Fax 949 462 9608 New York NY Tel 631 435 6000 San Jose CA Tel 408 735 9110 Canada Toronto Tel 905 673 0699 Fax 905 673 6509 DS50002154A page 40 Worldwide Sales and Service ASIA PACIFIC Asia Pacific Office Suites 3707 14 37th Floor Tower 6 The Gateway Harbour City Kowloon Hong Kong Tel 852 2943 5100 Fax 852 2401 3431 Australia Sydney Tel 61 2 9868 6733 Fax 61 2 9868 6755 China Beijing Tel 86 10 8569 7000 Fax 86 10 8528 2104 China Chengdu Tel 86 28 8665 5511 Fax 86 28 8665 7889 China Chongqing Tel 86 23 8980 9588 Fax 86 23 8980 9500 China Hangzhou Tel 86 571 8792 8115 Fax 86 571 8792 8116 China Hong Kong SAR Tel 852 2943 5100 Fax 852 2401 3431 China Nanjing Tel 86 25 8473 2460 Fax 86 25 8473 2470 China Qingdao Tel 86 532 8502 7355 Fax 86 532 8502 7205 China Shanghai Tel 86 21 5407 5533 Fax 86 21 5407 5066 China Shenyang Tel 86 24 2334 2829 Fax 86 24 2334 2393 China Shenzhen Tel 86 755 8864 2200 Fax
6. foo AN WW oo NE DS50002154A page 18 2014 Microchip Technology Inc Overview and Getting Started 1 6 GPIO PINS The Bluetooth audio module has 11 GPIO pins Several of these pins are reserved for specific functions during bootup and runtime As a demonstration the RN 52 EK board uses various GPIO pins to control the board s audio playback Table 1 3 describes the RN 52 EK GPIO pin demo function TABLE 1 3 RN52 PIN ASSIGNMENTS AND FUNCTIONS GPIO Pin RN 52 EK Demo Function Use Direction Default GPIO2 Toggles from high to low for 100 ms to indicate that the module s Runtime Output High state has changed A microcontroller can enter Command mode and Reserved poll the state register using the 9 action command Alternately the pin can also be configured to remain latched low after it gets asserted low for each new event until the 0 command unlatches it back to high Reserved Not available for reconfiguring as a general purpose IO pin GPIO3 Driving the pin high at boot time will put the module in DFU MODE Bootup Input Low The device will enter DFU mode in three seconds The PIO3 should Runtime be asserted high only before the device enters DFU mode and not Reserved after For USB DFU the USB device powers VBUS PIO3 requires 47K to ground and 22K to USB VBUS if USB VBUS is supplying power to main board During runtime driving the pin high will reset
7. 86 755 8203 1760 China Wuhan Tel 86 27 5980 5300 Fax 86 27 5980 5118 China Xian Tel 86 29 8833 7252 Fax 86 29 8833 7256 China Xiamen Tel 86 592 2388138 Fax 86 592 2388130 China Zhuhai Tel 86 756 3210040 Fax 86 756 3210049 ASIA PACIFIC India Bangalore Tel 91 80 3090 4444 Fax 91 80 3090 4123 India New Delhi Tel 91 11 4160 8631 Fax 91 11 4160 8632 India Pune Tel 91 20 3019 1500 Japan Osaka Tel 81 6 6152 7160 Fax 81 6 6152 9310 Japan Tokyo Tel 81 3 6880 3770 Fax 81 3 6880 3771 Korea Daegu Tel 82 53 744 4301 Fax 82 53 744 4302 Korea Seoul Tel 82 2 554 7200 Fax 82 2 558 5932 or 82 2 558 5934 Malaysia Kuala Lumpur Tel 60 3 6201 9857 Fax 60 3 6201 9859 Malaysia Penang Tel 60 4 227 8870 Fax 60 4 227 4068 Philippines Manila Tel 63 2 634 9065 Fax 63 2 634 9069 Singapore Tel 65 6334 8870 Fax 65 6334 8850 Taiwan Hsin Chu Tel 886 3 5778 366 Fax 886 3 5770 955 Taiwan Kaohsiung Tel 886 7 213 7830 Taiwan Taipei Tel 886 2 2508 8600 Fax 886 2 2508 0102 Thailand Bangkok Tel 66 2 694 1351 Fax 66 2 694 1350 EUROPE Austria Wels Tel 43 7242 2244 39 Fax 43 7242 2244 393 Denmark Copenhagen Tel 45 4450 2828 Fax 45 4485 2829 France Paris Tel 33 1 69 53 63 20 Fax 33 1 69 30 90 79 Germany Dusseldorf Tel 49 2129 3766400 Germany Munich Tel 49 89 627 144 0 Fax 49 89 627 144 44 Germany Pforzheim Te
8. A 1 provides an overview of the set commands Table A 2 describes the get or display commands and Table A 3 describes the action commands TABLE A 1 SET COMMANDS Command Description Factory Settings S lt hex16 gt Audio output routing 0002 S lt string gt Sets the normalized name RN52 S lt dec gt Automatic Shutdown on Idle 0 3 lt hex16 gt Extended Features 0000 for RN52 modules 0007 for RN52 EK SA lt 0 1 2 4 gt Authentication enable disable 2 SC lt hex24 gt Service class 240704 SD lt hex8 gt Discovery profile mask FF SF Factory defaults N A SK lt hex8 gt Connection profile mask FF SM lt hex32 gt Microphone LINEIN gain 00000909 SN lt string gt Device name RN52 XXXX SS lt hex8 gt Speaker Level OA ST lt hex8 gt Tone Level 16 STA lt dec gt Connection Delay 100 STP lt dec gt Pairing Timeout 0 SU lt hex8 gt UART Baudrate 05 TABLE A 2 GET DISPLAY COMMANDS Command Description D Basic settings G lt command gt Displays setting for the set command indicated by lt command gt GB AG Battery Status H Display help V Display the firmware version DS50002154A page 37 2014 Microchip Technology Inc Bluetooth Audio Module Command Reference User s Guide TABLE A 3 ACTION COMMANDS Command Description Toggle the local echo of RX characters in Command m
9. A2DP 3 08 HFP Default FF Example 5D 01 II Set the discovery profile to iAP 2 2 8 SF 1 This command sets all module parameters to the factory defaults The changes do not take effect until you reboot the module Note When performing a factory reset using a microcontroller send the sF 1 command wait for 20 ms send the R 1 command and wait for the module to return reboot Then drive GPIO9 high to exit Command mode Example sF 1 Invoke factory defaults R 1 II Reboot DS50002154A page 28 2014 Microchip Technology Inc Command Reference 2 2 9 SK lt 8 bit her value gt This command sets the connection mask where lt 8 bit hex value represents the pro files enabled for connection The Bluetooth profiles are represented by an 8 bit hex value as shown in Table 2 6 TABLE 2 6 BLUETOOTH PROFILE BITMASK VALUES Bit Position Value Profile 0 01 iAP 1 02 SPP 2 04 A2DP 3 08 HFP Default FF Example SK 08 II Set the connection profile to HFP 2 2 10 SM lt 32 bit her value gt The command sets microphone and line in gain levels The speaker level can be set from 00 through 1F Format of the command parameter is lt resresMBMA gt MA gain of microphone A MB gain of microphone B Default 00000909 Example SM 00000A0A 2 2 11 SN lt string gt This command sets the device name where lt string gt is up to 20 alphanumeric charac ters Default RN52 XXXX where X
10. EE eee ney 2014 Microchip Technology Inc DS50002154A page 21 Bluetooth Audio Module Command Reference User s Guide DEVICE FIRMWARE UPGRADE FOR FIRMWARE VERSIONS 1 16 AND HIGHER 1 9 Device Firmware Update DFU uses the UART port to update the firmware in the RN52 Implementing the DFU feature is highly encouraged as firmware updates offer new features which enhance the functions of the RN52 module Follow the reference design in Figure 1 13 When an external USB host is plugged into UART USB bridge DFU port the bridge enumerates as a virtual COM port Then atthe command window execute the command and the RN52 enters DFU mode Use the DFU wizard to then perform DFU on the RN52 module FIGURE 1 13 UART DFU PORT USING UART USB BRIDGE G UART RX R70 2k2 UART_TX vec VCCIO UART_CTS UART_RTS D MTAB P 1 10 STATUS LEDS The module can drive status LEDs that give you a visual confirmation that the module or board is powered up and operating Table 1 4 describes the status LEDs TABLE 1 4 STATUS LED FUNCTIONS Blue LED Red LED Description Flashing Flashing The RN52 module is discoverable Off Flashing The module is connected Flashing Off The module is connectable EVALUATION BOARDS AND REFERENCE DESIGNS Microchip s provides a variety of evaluation kits and reference designs for evaluation and prototyping The RN 52 EK evaluatio
11. Inc Preface CUSTOMER SUPPORT Users of Microchip products can receive assistance through several channels e Distributor or Representative e Local Sales Office e Field Application Engineer FAE e Technical Support Customers should contact their distributor representative or Field Application Engineer FAE for support Local sales offices are also available to help customers A listing of sales offices and locations is included in the back of this document Technical support is available through the web site at http support microchip com DOCUMENT REVISION HISTORY Revision A May 2014 This is the initial released version of this document 2014 Microchip Technology Inc DS50002154A page 9 Bluetooth Audio Module Command Reference User s Guide NOTES DS50002154A page 10 2014 Microchip Technology Inc BLUETOOTH AUDIO MODULE COMMAND REFERENCE MICROCHIP USER S GUIDE Chapter 1 Overview and Getting Started 1 1 OVERVIEW This document contains the software command reference and advanced configuration settings for Microchip s Bluetooth audio modules Commands and settings that are specific to a single product or product family are identified as such in the document NOTICE TO CUSTOMERS The commands and applications described in this document apply to Microchip s Bluetooth audio modules e g the RN52 They do not apply to Microchip s Bluetooth data modules such as the RN41 or R
12. and reboot the device Reserved Not available for reconfiguring as a general purpose IO pin Note During runtime the device will reset within 500 ms after the IO is driven high A reset pulse of 100 ms is recommended If the IO continues to be driven high after reset the device will naturally enter DFU mode The device will enter DFU mode in three seconds The PIO3 should be asserted high only before the device enters DFU mode and not after GPIO4 Driving this pin high during bootup will put the module in Factory Bootup Input Low Reset mode To reset the module to the factory defaults this pin Runtime should be high on power up and then toggle low high low high with Reserved a 1 second wait between the transitions During runtime the module will enter voice command mode if this pin is driven low Reserved Not available for reconfiguring as a general purpose IO pin GPIO5 The RN52 EK uses this pin for the volume up button This pin is Runtime Input High active low Configuration GPIO6 Available for input or output configuration at runtime Runtime I O High Configuration GPIO7 Driving this pin low sets the UART baud rate to 9 600 bps By default Bootup Input High the pin is high and the UART has a baud rate of 115200 bps Configuration GPIO9 Driving this pin low puts the module s UART into Command mode Runtime Input High Driving this pin high puts the module s UART into Data mode Reserved Reserved Not available for use a
13. connection status in the event status register It returns an encoded byte stream of ASCII hex values terminated by r n to describe the status of the currently connected profile s The module drives GPIO2 low for 100 ms to notify attached equipment that the event status register has been changed See Section 1 6 1 Using GPIO2 to Monitor the Event or Status Register for more information DS50002154A page 34 2014 Microchip Technology Inc Command Reference Byte 0 of the byte stream indicates which profiles are connected as shown Table 2 8 TABLE 2 8 BYTE 0 BIT FORMAT Bit Description iAP wireless active connection to remote device SPP active connection to remote device A2DP active connection to remote device HFP HSP active connection to remote device Caller ID notification event from audio gateway Oo Track change event notification 6 7 Reserved Table 2 9 describes the bits in byte 1 Note that e The connection state values bits 0 3 only change when the module s status changes e The event bits 4 6 in byte 0 are cleared when you issue the 0 command TABLE 2 9 BYTE 1 BIT FORMAT Bit Description 0 3 These bits indicate the connection state See Table 2 10 for a listing of the possible states 4 HFP audio volume level change from audio gateway phone Use the Y 0 command to retrieve the volume level The module clears this bit when you read t
14. device has exchanged pin codes with this device a link key is stored for future use The device stores up to 8 keys in Flash memory in a first in first out fashion TABLE 2 4 SET AUTHENTICATION VALUES Value Description 0 Open Authentication is not required The device accepts pin code mode 1 SSP Keyboard I O mode is an association model of Secure Simple Pairing SSP default This mode is for scenarios where both devices are capable of displaying a passkey and are capable of providing an accept reject response on a keyboard If this option is set the remote host receives a prompt reply yes to pair The host posts a message asking for confirmation the module can respond yes or no Using console command the module can be configured to automatically respond yes or can be configured for the user to issue a yes or no confirmation 2 SSP just works mode is an association model of SSP This mode is for end applications where at least one of the devices does not have a display capable of displaying the passkey information or keyboard capability to provide a response 4 Pin Code mode is part of legacy pairing Forces pin code mode which requires the host device to enter a pin code that matches the stored pin code Note Modes 0 and 4 are legacy modes that do not support Secure Simple Pairing SSP Bluetooth version 2 0 Default 1 II Keyboard mode Example sa 4 II Set to pin code mode
15. information refer to the Bluetooth Data Module Command Reference and Advanced Information User s Guide COMMAND SYNTAX To issue commands to the module you send a keyword followed by optional parameters via the UART All commands are one or two characters and can be upper or lower case e Delimit command arguments with a comma Commands use decimal input except where noted e Text data such as the Bluetooth name and pin code is case sensitive There are three general command categories as shown in Table 2 1 TABLE 2 1 COMMAND TYPES Command Type Description Set commands Store information to Flash memory Changes take effect after a power cycle or reboot Get commands Retrieve and display the stored information Action commands Perform actions such as controlling the audio playback performing inquiries connecting etc Set commands only take effect AFTER reboot except where noted Get and action commands take effect immediately Each command terminates with the carriage return r SET COMMANDS Set commands specify configuration settings and take effect after power cycling or rebooting Commands are not case sensitive All commands respond with AOK lt optional message gt r n for success or ERR lt optional message gt r n if the command fails 2 21 S lt hex16 gt This command sets the routing for the A2DP audio output where lt value gt is a value shown in Tabl
16. microchip com web site DS50002154A page 20 2014 Microchip Technology Inc Overview and Getting Started FIGURE 1 11 CONNECTING THE RN52 TO A MICROCONTROLLER Command 8 Control Streaming Audio Out RX Left TK Right 4 Speaker Microcontroller CTS RN52 RTS Ground GPIO2 GPIO9 Ground 3 3 VDC 1 8 DEVICE FIRMWARE UPGRADE FOR FIRMWARE VERSIONS 1 10 AND LOWER The module supports the Device Firmware Update DFU mode in which you use the module s USB interface to update the firmware Implementing the DFU feature is rec ommended highly because firmware updates offer new features and enhance the mod ule s functionality Follow the reference design shown in Figure 1 12 to support this mode Note A 47 KO pull down resistor R2 in Figure 1 12 is required on GPIO3 even if you do not use the USB for DFU FIGURE 1 12 USB DFU PORT AND GPIO3 SCHEMATIC C4 f D1 VBUS 3 3V Wo 10nF GPIO3 RI 4 MBR120 22k i J2 USBD A USBD 3j p MTAB 55 gt GND 47k z USB Mini B Connector JAE DX2RO05HN2E700 When you connect an external USB host into the DFU port and power vBus the module enters DFU mode when you reboot or power it If your board is not powered by vBus you do not need to include the C4 and D1 to vBus inputs on the voltage regulator
17. the module to accept an incoming voice call You use the 0 command to retrieve the call status bits 8 10 value The module returns an error ERR if the call status is not set to incoming calls Example c Il Accept incoming call 2 4 15 E This command terminates an active call or rejects an incoming call The module returns an error ERR if the call status is not an incoming call or active call Example E Terminate call 2 4 16 F This command releases terminates all held calls or sets user busy for waiting call Example F 2 4 17 J This command releases terminates all active calls and accepts other held or waiting calls Example J 2 4 18 L This command places all active calls on hold and accepts other held or waiting calls Example L 2 4 19 N This command adds a held call to the active conversation Example N 2 4 20 O This command connects the two calls and disconnects the subscriber from both calls Example O 2014 Microchip Technology Inc DS50002154A page 33 Bluetooth Audio Module Command Reference User s Guide 2 4 21 X lt 0 1 gt This command transfers the active call between HF and AG Example x 1 Transfer active call from AG to HF 2 4 22 P This command activates the voice command application on the media device if avail able and allows sending voice commands over Bluetooth Example P 2423 1 This command configures GPIO direction 16 bit mask is used to set
18. DSCs KEELOQ code hopping devices Serial EEPROMs microperipherals nonvolatile memory and analog products In addition Microchip s quality system for the design and manufacture of development systems is ISO 9001 2000 certified DS50002154A page 2 2014 Microchip Technology Inc BLUETOOTH AUDIO MODULE COMMAND REFERENCE MICROCHIP USER S GUIDE Table of Contents RSR WE cee WANASA NANA KAA NANASI 5 Chapter 1 Overview and Getting Started II OVERVIEW AA 11 1 2 Audio and Data Bluetooth Profiles 12 AUD SENGS Se ne 13 1 4 Making a Bluetooth Connection wwwwwwwmmamwwwwwumanananaww mwa aananamiwaa 13 1 5 Command Mode vs Data Mode cccceeeeeeeeeeeneeeeeeeeeeeeeeeeeeeeeneneeneeees 15 TP IIPS AA re ES 19 1 7 Connecting with a Microcontroller 20 1 8 Device Firmware Upgrade for Firmware Versions 1 10 and Lower 21 1 9 Device Firmware Upgrade for Firmware Versions 1 16 and Higher 21 1 10 Status LEDS waa 22 1 11 Evaluation Boards and Reference Designs wwwwamamamwmwaaaanaamwwaa 22 Chapter 2 Command Reference 2 1 Command Syntax a3 cuca ctcmetcatiatarcancecectentaudatoenilanneeusel anonedscxadadiedcancetategwiangasse 25 2 2 Set Commands sense 25 2 3 Get Commands sise 30 2 4 Action COMMANAS seen 32 Appendix A Command Quick Reference Guide Appe
19. FP Audio The Hands Free Profile HFP is commonly used in car hands free kits to communicate with mobile phones in the vehicle HSP Audio The headset profile provides support for using Bluetooth headsets with mobile phones This profile is dependent on and used with the HFP profile SPP Data SPP defines a virtual serial port between two Bluetooth enabled devices SPP emulates a bidirectional serial link iAP Data The RN52 supports Wireless iAP discovery by MFi devices and provides a low level RFCOMM connection to the MFi device An external host controller with an MFi library is required to perform authentication and iAP protocol implementation Figure 1 2 shows a block diagram of the RN52 with Bluetooth audio and data profiles and GPIO pins FIGURE 1 2 RN52 PROFILE CONNECTION BLOCK DIAGRAM 1285S l2s SPDIF SPDIF AUDIO Analog Audio 45X Codec Speaker MIC RN52 Bluetooth Module UART UART GPIO GPIO Control Status EE DS50002154A page 12 2014 Microchip Technology Inc Overview and Getting Started 1 3 AUDIO SETTINGS The module s settings can be controlled through the UART interface using a simple ASCII command language For example you can change the audio routing and or pro file Set commands configure the module and get commands echo the current config uration Because the module reads the configuration into RAM once at boot time configuration settings modified
20. GPIO direction bit on for output and bit off for input If no argument is specified the current configura tion is returned 2 4 24 18 This command configures GPIO level and input pull up configuration Bit on is logical high bit off logical low If no argument is specified the current levels are returned The 16 bit lt hex16 gt value is PIO bit map bit4 PIO4 When PIO is configured as an out put 1 amp lt hex16 gt drives the level high for PIO specified in lt hex16 gt When PIO is con figured as an input 18 configures the PIO to use a pull up bit set or pull down bit clear 2 4 25 K lt 8 bit hex value gt This command disconnects the currently active connection where lt 8 bit hex value gt represents the profile to disconnect The characters KILL lt cr gt lt lf gt are echoed to the local UART once the connection is broken The Bluetooth profiles are represented by an 8 bit hex value as shown in Table 2 7 TABLE 2 7 BLUETOOTH PROFILE BITMASK VALUES Bit Position Value Profile 0 01 iAP 1 02 SPP 2 04 A2DP 3 08 HFP Example xK 01 II Disconnect the iAP profile 24 26 M lt flag gt This command controls the hold mute function for the current telephone call where lt flag gt is 0 or 1 If lt flag gt is 1 the module mutes the call if lt flag gt is 0 the call is unmuted Example m 1 Mute the call 2 4 27 Q This command queries the current
21. N42 For data module configuration information refer to the Bluetooth Data Module Command Reference and Advanced Information User s Guide Microchip s RN52 Bluetooth audio module offers multiple Bluetooth services in a com pact form factor that can be controlled via a simple ASCII command set The RN52 pro vides the following functions A2DP sink HFP HSP SPP and AVRCP The A2DP sink function receives high quality stereo audio from a Bluetooth audio source such as a smartphone or MP3 media player In addition to audio the RN52 s HFP HSP service accepts voice calls from an Audio Gateway AG such as a smartphone or VOIP host software The AVRCP profile allows the RN52 to control the volume level and to track the A2DP audio s information The SPP profile allows asynchronous serial data be transferred from the RN52 to a remote Bluetooth device An example RN52 use case is provided below in Figure 1 1 This example shows an implementation of Bluetooth wireless speakers using the RN52 FIGURE 1 1 EXAMPLE OF BLUETOOTH WIRELESS SPEAKERS USING THE RN52 MODULE Bluetooth T Left Right Speaker RN52 Ground Ground 3 3 VDC This document assumes that you have a working knowledge of Bluetooth operation and communications To configure Microchip s modules you need a Bluetooth enabled smartphone or PC either built in or using a USB Bluetooth dongle You ca
22. N52 UART RX i CMD r n 0 END For applications in which a microcontroller controls GPIO9 and sends commands over the UART the microcontroller should monitor the UART RX line for the following strings immediately after driving GPIO9 e CMD r n e END r n Use the state diagram shown in Figure 1 7 as a guideline when designing code to mon itor GPIO9 and command states FIGURE 1 7 STATE DIAGRAM FOR ENTERING AND EXITING COMMAND MODE Wait for CMD r n GPIO9 CMD r n Set Low Received Data Mode Ready Timeout END r n GPIO9 Received Set High Wait for END r n While in Command mode the device accepts ASCII bytes as commands When you enter a valid command the module returns Aok It returns ERR for an invalid command and for unrecognized commands Type h lt cr gt to see a list of commands Send Command Wait for Command Receive Reply Timeout A quick check to confirm that you are in Command mode is to type the D lt cr gt command after entering Command mode This command shows the a summary of the module s current settings such as the Bluetooth name device class and serial port settings 2014 Microchip Technology Inc DS50002154A page 17 Bluetooth Audio Module Command Reference User s Guide See Figure 1 8 To return to Data mode drive GPIO9 high When leaving Command mode the module sends End to the UART FIGURE 1 8 VIEW CURRENT SETTINGS
23. XXX is the last 4 digits of the module s MAC address When you set the name the XXXX is not appended to lt string gt Example SN MyDevice Set the device name to MyDevice 2 2 12 SP lt string gt This command sets the security pin code where lt string gt is up to 20 alphanumeric characters Each time the device pairs successfully it saves the Bluetooth address The device can store up to eight addresses on a first in first out basis Using this com mand also erases all stored pairings You can use the same value that is already set You cannot erase the pin code however you can overwrite the default pin code Default 1234 Example sp 0123 II Set pin code to 0123 2 2 13 SS lt 8 bit hex value gt The command sets speaker gain levels The speaker level can be set from 00 through OF Default 0A Example SS 0A 2014 Microchip Technology Inc DS50002154A page 29 Bluetooth Audio Module Command Reference User s Guide 2 2 4 ST lt 8 bit hex value gt The command sets tone gain levels The tone level can be set from 00 through 1F Default 16 Example ST 10 2 2 15 STA lt dec gt The command sets the delay between connection tries in milliseconds Default 100 Example STA 1000 2 2 16 STP lt dec gt The command sets the pairing timeout in seconds Default 0 Example STP 30 2 2 17 SU lt 8 bit hex value gt The command sets the UART baudrate 01 9600 bps 02 19200 bps 03
24. c Comparison using Yes No Keyboard IO The RN52 module can be configured through the UART command console to use either of the above pairing methods To pair with the module click its name in the Bluetooth device scan list The default authentication mode is Just Works which requires no user interaction The link key is generated stored and a connection gets established For subsequent connections the stored link keys are compared and the connection is established The module s firm ware automatically stores up to 8 pairings from remote hosts in a first in first out fash ion If the remote Bluetooth device does not require authentication a connection can occur without the pairing process However the Bluetooth specification requires that if either device involved in the pairing process requires authentication the other device must participate to ensure a secure link Microchip s modules default to Just Works mode In numeric comparison using yes no keyboard IO mode the user is shown a 6 digit number on both the module console and the pairing device display The user has to verify that the numbers match or don t match on both devices by entering a yes or no response A command is provided to enter a yes or no response on the module command console The module can also be configured to send an accept response automatically In legacy pairing mode the pairing device requests a 4 digit fixed PIN for authentica tion In this case use t
25. e 2 2 HSP HFP voice calls are routed through analog speaker and microphone Sets the route for audio output AU the audio bit resolution W and sam ple rate R Values are lt AUWR gt 2014 Microchip Technology Inc DS50002154A page 25 Bluetooth Audio Module Command Reference User s Guide TABLE 2 2 A2DP AUDIO ROUTING VALUES AU Value Description 00 Analog output default 01 Set the output for 12S See Table 2 3 for the 128 settings the RN52 interface supports 02 Set the output for S PDIF 03 Intercom DAC mode TABLE 2 3 RN52 125 SETTINGS Parameter Value Configuration Master mode Supported sample rates Variable Sample width 24 bits Synchronous data Data is right channel with word select WS high The SD data MSB occurs in the second SCLK period Justification Left justified WR Sample Rate and Sample Width W Bits Per Sample 0 24 1 32 R Sample Rate Samples Per Second 0 8K 1 32K 2 44K1 3 48K Default 0002 Example s 0102 II Set the audio output to 12S 2 2 2 S lt string gt This command sets the module s normalized name where lt string gt is a prefix of up to 15 alphanumeric characters The module s name is set to lt string gt XXXX where XXXX is the last four digits of the module s MAC address This setting is useful for situations in which you want to set up multiple modules with similar but unique identifiers
26. ecific data sheets contain current information on the module specifications Other useful documents are listed below The following Microchip documents are available at www microchip com and recommended as supplemental reference resources RN52 Bluetooth Audio Module Data Sheet DS70005120 This document provides the technical specifications for the RN52 module RN52 Evaluation Kit User s Guide DS50002153 This document describes how to use the RN52 Evaluation Kit and provides an audio demonstration 2014 Microchip Technology Inc DS50002154A page 7 Bluetooth Audio Module Command Reference User s Guide THE MICROCHIP WEB SITE Microchip provides online support via our web site at www microchip com This web site is used as a means to make files and information easily available to customers Accessible by using your favorite Internet browser the web site contains the following information Product Support Data sheets and errata application notes and sample programs design resources user s guides and hardware support documents latest software releases and archived software General Technical Support Frequently Asked Questions FAQs technical support requests online discussion groups Microchip consultant program member listing Business of Microchip Product selector and ordering guides latest Microchip press releases listing of seminars and events listings of Microchip sales offices distributors and factory r
27. epresentatives DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE Microchip s customer notification service helps keep customers current on Microchip products Subscribers will receive e mail notification whenever there are changes updates revisions or errata related to a specified product family or development tool of interest To register access the Microchip web site at www microchip com click on Customer Change Notification and follow the registration instructions The Development Systems product group categories are Compilers The latest information on Microchip C compilers and other language tools These include the MPLAB C compiler MPASM and MPLAB 16 bit assemblers MPLINK and MPLAB 16 bit object linkers and MPLIB and MPLAB 16 bit object librarians Emulators The latest information on the Microchip MPLAB REAL ICE in circuit emulator In Circuit Debuggers The latest information on the Microchip in circuit debugger MPLAB ICD 3 MPLAB IDE The latest information on Microchip MPLAB IDE the Windows Integrated Development Environment for development systems tools This list is focused on the MPLAB IDE MPLAB SIM simulator MPLAB IDE Project Manager and general editing and debugging features Programmers The latest information on Microchip programmers These include the MPLAB PM3 device programmer and the PICkit 3 development programmers DS50002154A page 8 2014 Microchip Technology
28. es the user data to the UART When data is written to the UART the module constructs the Bluetooth packet protocol and sends it out over the Bluetooth connection Thus the entire process of sending receiv ing data to the host is transparent to the end microprocessor See Figure 1 4 Note While in Command mode the module can be configured for specific fea tures using a serial terminal emulator over UART The terminal emulator behaves as a command console in Command mode 2014 Microchip Technology Inc DS50002154A page 15 Bluetooth A udio Module Command Reference User s Guide FIGURE 1 4 DATA AND COMMAND MODES GPIO9 gt m RN52 Bluetooth Module Bluetooth Protocol Data CMD You can only configure the Bluetooth audio module locally using your computer s serial port using the RN52 Command mode You cannot configure the module remotely over the Bluetooth link Note 1 5 1 Default Configuration and Serial Port Settings Table 1 2 shows the default configuration for the Bluetooth module TABLE 1 2 DEFAULT CONFIGURATION AND SERIAL PORT SETTINGS Option Setting Bluetooth mode Slave 1234 Bluetooth pin code for legacy pairing mode can be changed Baud rate 115 200 Kbps Bits 8 Parity None Stop bits 1 Flow control Enabled 1 5 2 Configuring the Module over the UART Connect the module to your computer For example if you are u
29. gister s data is overwritten with the new event information Some bits are cleared when you read the data See Section 2 4 26 Q for details Figure 1 9 illustrates three event notifications FIGURE 1 9 GPI02 EVENT NOTIFICATION GPIO High 100 ms 100 ms 100 ms Starting with firmware 1 16 and later a new option was added to use a latched event notifications PI02 can also be configured to be held LOW for each new event and to remain latched LOW until the o command unlatches PIO2 back to HIGH If this noti fication scheme is not desired then the module can be reconfigured to 100 ms low pulse notification on an event FIGURE 1 10 GPIO2 LATCHED EVENT NOTIFICATION High PIO2 Low Event Latched Event Unlatched Event Latch Unlatched RN S2 UART TX aeeteese cee ocean ns N eee ee Wee 2 1 7 CONNECTING WITH A MICROCONTROLLER Figure 1 11 shows a simple schematic in which a microcontroller controls the RN52 module This schematic shows the bare minimum configuration required for the microcontroller to perform the following functions e Configure and control the module e Get module s status information see Section 2 4 26 Q for more details Stream audio over the Bluetooth link For a more complex example of how to control the RN52 refer to the RN52 Evaluation Kit schematic in the RN52 Evaluation Kit User s Guide available online at Microchip http www
30. he event status register with the 0 command 5 HFP audio microphone level change from audio gateway phone Use the y 1 command to retrieve the volume level The module clears this bit when you read the event status register with the 0 command 6 7 Reserved Table 2 3 describes the connection states in bits 0 3 of byte 1 TABLE 2 10 BYTE 1 CONNECTION STATES Value State Description 0 Limbo Logically off but physically on 1 Connectable The module is connectable page scanning 2 Connectable and discoverable The module is connectable and discoverable page and inquiry scanning 3 Connected The module is connected to an audio gateway 4 Outgoing call established The connected audio gateway has an outgoing call in progress 5 Incoming call established The connected audio gateway has an active call in progress and the audio is in the headset 6 Active call The connected audio gateway has an active call in progress and the audio is in the headset 7 Test mode The headset is in Test mode 8 Three way call waiting The connected audio gateway has an active call and a second call on hold 9 Three way call on hold The connected audio gateway has an active call and a second call on hold 10 Three way call multi call The connected audio gateway has an active call and a second call on hold 11 Incoming call on hold The connected audio gateway has an incoming call on hold 12 Ac
31. he module s default PIN code 1234 as the pass key After you enter the PIN code the Bluetooth devices compare them If they match a link key is generated and stored Usually but not always the remote device stores the link key For subsequent connections the devices compare link keys If they are correct you do not need to re enter the pin code The PIN code can be set as desired using the com mand console To remove the stored link key on the remote device you typically unpair or remove the device from the Bluetooth manager The pairing information can be reset by exe cuting the reset Paired Device List PDL command on the command console You can change the pin code to remove the link key on the Bluetooth adapter forcing a new pin code exchange to occur upon subsequent connection attempts Figure 1 3 shows examples of Bluetooth devices discovered list and pair connect inter faces DS50002154A page 14 2014 Microchip Technology Inc Overview and Getting Started FIGURE 1 3 PAIRING CONNECTING WITH THE BLUETOOTH MODULE Windows 7 Android 2 3 4 iOS 5 1 1 r at ATET 10 49 AM 20 PA Bluetoott wy lt Devi gt Bluetoo 4 Add a device 2 o gt Bluetooth ar 4 Devices 2 Devices RN52 3C Connected za CHN LT C15137 Not Paired LS SVDC LT C15131 Not Paired N iRemote D209 RNS2 65 MSOME W Y 2 items JI Sej 1 4 3 Connecting After pairing w
32. ip Web Site Development Systems Customer Change Notification Service Customer Support Document Revision History DOCUMENT LAYOUT This user s guide describes how to use the Bluetooth Audio Module Command Reference The document is organized as follows e Chapter 1 Overview and Getting Started This chapter introduces the Blue tooth Audio Module Command Reference and provides an overview of various features Chapter 2 Command Reference This chapter describes the command ref erence and syntax of the Bluetooth Audio Module Command Reference Appendix A Command Quick Reference Guide This appendix displays tables of firmware commands and factory defaults for the Bluetooth Audio Module Command Reference Appendix B Firmware Revision History This appendix is a revision history of the firmware 2014 Microchip Technology Inc DS50002154A page 5 Bluetooth Audio Module Command Reference User s Guide CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions DOCUMENTATION CONVENTIONS Description Represents Examples Arial font Italic characters Referenced books MPLAB IDE User s Guide Emphasized text is the only compiler Initial caps A window the Output window A dialog the Settings dialog A menu selection select Enable Programmer Quotes A field name in a window or __ Save project before build dia
33. ith the device is successful the module can now connect to the device Click connect using the pair connect interface to establish a connection Once connected the module enables the Advanced Audio Distribution Profile A2DP for audio playback and the Audio Video Remote Control Profile AVRCP for player control Additionally a Serial Port Profile SPP link can be established by opening the virtual COM port available on the RN52 module from a PC over its Bluetooth device When you connect to a PC for using SPP after the Bluetooth device manager com pletes pairing connecting it issues a message that the Bluetooth device is installed on COM port X where the specific COM port is unique to your computer After connecting successfully the data can be transmitted and received on the Bluetooth COM port link in Data mode In some cases the Bluetooth device manager creates two COM ports In this situation use the incoming port to wait for the module to initiate a connection Open the outgoing port to establish a connection to the module Note Only one Bluetooth master can connect to an RN52 Bluetooth slave device at a time 1 5 COMMAND MODE VS DATA MODE The RN52 UART has two modes Data mode default and Command mode While in Data mode and connected over Bluetooth SPP or iAP the module is essentially a data pipe When the module receives data over the wireless Bluetooth connection it strips the Bluetooth headers and trailers and pass
34. l 49 7231 424750 Italy Milan Tel 39 0331 742611 Fax 39 0331 466781 Italy Venice Tel 39 049 7625286 Netherlands Drunen Tel 31 416 690399 Fax 31 416 690340 Poland Warsaw Tel 48 22 3325737 Spain Madrid Tel 34 91 708 08 90 Fax 34 91 708 08 91 Sweden Stockholm Tel 46 8 5090 4654 UK Wokingham Tel 44 118 921 5800 Fax 44 118 921 5820 03 25 14 2014 Microchip Technology Inc
35. log Underlined italic text with A menu path File gt Save right angle bracket Bold characters A dialog button Click OK A tab Click the Power tab N Rnnnn A number in verilog format 4 b0010 2 hF1 where N is the total number of digits Ris the radix and nis a digit Text in angle brackets lt gt A key on the keyboard Press lt Enter gt lt F1 gt Courier New font Plain Courier New Sample source code define START Filenames autoexec bat File paths e mecl8 h Keywords _asm endasm static Command line options Opa Opa Bit values Oral Constants OxFF A Italic Courier New A variable argument file o Where file can be any valid filename Square brackets Optional arguments mcci8 options file options Curly brackets and pipe Choice of mutually exclusive errorlevel 011 character arguments an OR selection Ellipses Replaces repeated text var_name var_name Represents code supplied by void main void user DS50002154A page 6 2014 Microchip Technology Inc Preface WARRANTY REGISTRATION Please complete the enclosed Warranty Registration Card and mail it promptly Sending in the Warranty Registration Card entitles users to receive new product updates Interim software releases are available at the Microchip web site RECOMMENDED READING This user s guide describes how to configure Microchip Bluetooth modules The mod ule sp
36. mmand Example GA Display the authentication mode GP II Display the pin code 2 3 3 GB This command retrieves and displays the battery status level of the Audio Gateway AG Example GB AGBatteryLevel 80 2 3 4 H The help command displays a list of commands and their basic syntax Example H II Display help 2 3 5 V This command displays the firmware version Example v Show the firmware version 2014 Microchip Technology Inc DS50002154A page 31 Bluetooth Audio Module Command Reference User s Guide 2 4 ACTION COMMANDS Action commands perform actions such as audio playback inquiries connecting and entering exiting Command mode Commands are not case sensitive 2 4 1 This command toggles the local echo on and off If you send the command in Com mand mode all typed characters are echoed to the output Typing a second time turns local echo off Default Off Example II Turn local echo on 2 4 2 lt flag gt This command toggles whether the module is discoverable where lt flag gt is 1 discov erable or 0 not discoverable Example 1 Make the module discoverable 2 4 3 lt 0 1 gt This command accepts rejects pairing in keyboard IO authentication mode lt y n gt or lt Y N gt also work Example 1 II Accept pairing pass key 2 4 4 This command will put the RN52 module into Device Firmware Upgrade DFU mode Example 2 4 5 A lt telephone number g
37. n kit is a prototyping platform for the RN52 module The board contains buttons to control audio playback volume up down next previous track pause play and connections for plugging in external speakers The board has the flexibility to connect directly to PCs via a standard USB interface or to embedded processors through the TTL UART interface The status LEDs switches and signal headers enable rapid prototyping and integration into existing systems Figure 1 14 shows the board 1 11 ES DS50002154A page 22 2014 Microchip Technology Inc Overview and Getting Started FIGURE 1 14 RN 52 EK EVALUATION KIT For more information on available evaluation boards and reference designs refer to the Microchip http www microchip com web site 2014 Microchip Technology Inc DS50002154A page 23 Bluetooth Audio Module Command Reference User s Guide NOTES DS50002154A page 24 2014 Microchip Technology Inc BLUETOOTH AUDIO MODULE COMMAND REFERENCE MICROCHIP USER S GUIDE Chapter 2 Command Reference Microchip s Bluetooth modules support a variety of commands for configuration This section describes these commands in detail and provides examples The commands and applications described in this document apply to Microchip s Bluetooth audio modules e g the RN52 They do not apply to Microchip s Bluetooth data modules such as the RN41 or RN42 For data module configuration
38. n only con figure one device at a time Once configured device settings are saved independent of power down until they are explicitly changed or the factory defaults are restored 2014 Microchip Technology Inc DS50002154A page 11 Bluetooth Audio Module Command Reference User s Guide 1 2 AUDIO AND DATA BLUETOOTH PROFILES The audio module supports several Bluetooth profiles as described in Table 1 1 Upon power up the module is configured as a slave and is ready to pair and connect The A2DP AVRCP profile is enabled and connected to the negotiated codec and analog l O Bluetooth master devices can discover and use the profiles listed in Table 1 1 You con figure each profile to be discoverable by using ASCII commands in Command mode over the data interface The module can enable multiple profile connections simultane ously and broadcast the profiles it has available When you pair the module with a smartphone the smartphone decides which profile connection s to use TABLE 1 1 SUPPORTED BLUETOOTH PROFILES Profile Type Comments A2DP Audio The advanced audio distribution profile A2DP defines how high quality audio stereo or mono can be streamed from one device to another over a Bluetooth connection AVRCP Audio The audio video remote control profile provides a standard interface to control audio video equip ment such as TVs and high fidelity equipment This profile is dependent on and used with the A2DP profile H
39. ndix B Firmware Revision History Worldwide Sales and Servir tennis 40 2014 Microchip Technology Inc DS50002154A page 3 Bluetooth Audio Module Command Reference User s Guide NOTES DS50002154A page 4 2014 Microchip Technology Inc BLUETOOTH AUDIO MODULE COMMAND REFERENCE MICROCHIP USER S GUIDE Preface NOTICE TO CUSTOMERS All documentation becomes dated and this manual is no exception Microchip tools and documentation are constantly evolving to meet customer needs so some actual dialogs and or tool descriptions may differ from those in this document Please refer to our web site www microchip com to obtain the latest documentation available Documents are identified with a DS number This number is located on the bottom of each page in front of the page number The numbering convention for the DS number is DSXXXXXA where XXXXX is the document number and A is the revision level of the document For the most up to date information on development tools see the MPLAB IDE on line help Select the Help menu and then Topics to open a list of available on line help files INTRODUCTION This chapter contains general information that will be useful to know before using the Bluetooth Audio Module Command Reference Items discussed in this chapter include Document Layout Conventions Used in this Guide Warranty Registration Recommended Reading The Microch
40. ode lt flag gt Toggle whether the module is discoverable lt 0 1 gt Accept reject pairing Put the module into DFU mode A lt telephone number gt Initial a voice call to lt telephone number gt AD Retrieve track metadata information AR Redial last dialed number AV Increase the volume AVRCP command AV Decrease the volume AVRCP command AT Play the next track AVRCP command AT Play the previous track AVRCP command AP Pause or start playback AVRCP command Reconnect Bluetooth profiles to the most recently paired and connected device Accept an incoming voice call E Terminate an active call or reject an incoming call F Release all held calls 16 Read GPIO configuration I lt hex16 gt Set GPIO configuration I amp Reads current GPIO levels for input I amp lt hex16 gt Set GPIO levels for output J Accept waiting calls and release active calls K lt hex8 gt Kill the currently active connection L Accept waiting calls and hold active calls lt flag gt Toggle the on hold mute function Add held call Connect two calls and disconnect the subscriber Activate Voice Command Query the current connection status Reboot Reset Paired Device List PDL Retrieves caller ID information Transfer call between HF and AG DS50002154A page 38 2014 Microchip Technolog
41. rated in the U S A Silicon Storage Technology is a registered trademark of Microchip Technology Inc in other countries Analog for the Digital Age Application Maestro BodyCom chipK IT chipKIT logo CodeGuard dsPICDEM dsPICDEM net dsPICworks dsSPEAK ECAN ECONOMONITOR FanSense HI TIDE In Circuit Serial Programming ICSP Mindi MiWi MPASM MPF MPLAB Certified logo MPLIB MPLINK mTouch Omniscient Code Generation PICC PICC 18 PICDEM PICDEM net PICkit PICtail REAL ICE rfLAB Select Mode SQI Serial Quad I O Total Endurance TSHARC UniWinDriver WiperLock ZENA and Z Scale are trademarks of Microchip Technology Incorporated in the U S A and other countries SQTP is a service mark of Microchip Technology Incorporated in the U S A GestIC and ULPP are registered trademarks of Microchip Technology Germany II GmbH amp Co KG a subsidiary of Microchip Technology Inc in other countries All other trademarks mentioned herein are property of their respective companies 2014 Microchip Technology Incorporated Printed in the U S A All Rights Reserved LI Printed on recycled paper ISBN 978 1 63276 243 6 Microchip received ISO TS 16949 2009 certification for its worldwide headquarters design and wafer fabrication facilities in Chandler and Tempe Arizona Gresham Oregon and design centers in California and India The Company s quality system processes and procedures are for its PIC MCUs and dsPIC
42. sing the RN 52 EK evaluation board connect the UART to USB connector on the RN52 EK to your com puter using a mini B USB cable With the Bluetooth module connected and powered on run a terminal emulator and open the COM port to which the cable is connected The terminal emulator s communication settings should match the Bluetooth module s default serial port settings Once configuration is complete reset the device 1 5 3 Command Mode and GPIO9 Launch a terminal emulator and specify the module s default settings see Table 1 2 The module monitors GPIO9 as an input to determine whether data traversing the UART should be routed to the active Bluetooth SPP connection or to the command console When you hold GPIO9 low the UART enters Command mode The module returns the string cmp to the UART console to indicate that the module is in Command mode Figure 1 5 shows a logical diagram of the GPIO9 function DS50002154A page 16 2014 Microchip Technology Inc Overview and Getting Started FIGURE 1 5 GPIO9 CONTROLLING COMMAND MODE DATA UART CMD GPIO9 In Command mode the module routes all data entering the UART to the command con sole In the command console you configure the module and query its status using ASCII commands See Figure 1 6 FIGURE 1 6 PULLING GPIO9 LOW ROUTES UART TRAFFIC TO THE COMMAND CONSOLE GPIO9 High eee L Wa Low Data Mode Command Mode Data Mode R
43. t Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates It is your responsibility to ensure that your application meets with your specifications MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED WRITTEN OR ORAL STATUTORY OR OTHERWISE RELATED TO THE INFORMATION INCLUDING BUT NOT LIMITED TO ITS CONDITION QUALITY PERFORMANCE MERCHANTABILITY OR FITNESS FOR PURPOSE Microchip disclaims all liability arising from this information and its use Use of Microchip devices in life support and or safety applications is entirely at the buyer s risk and the buyer agrees to defend indemnify and hold harmless Microchip from any and all damages claims suits or expenses resulting from such use No licenses are conveyed implicitly or otherwise under any Microchip intellectual property rights QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV ISO TS 16949 Trademarks The Microchip name and logo the Microchip logo dsPIC FlashFlex KEELOQ KEELOQ logo MPLAB PIC PlCmicro PICSTART PIC logo rfPIC SST SST Logo SuperFlash and UNI O are registered trademarks of Microchip Technology Incorporated in the U S A and other countries FilterLab Hampshire HI TECH C Linear Active Thermistor MTP SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorpo
44. t This command initiates a voice call to a telephone where lt telephone number is a decimal telephone number up to 25 digits The module returns an error ERR if the call status is not idle Example a 14083955300 II Call 1 408 395 5300 2 4 6 AD This command shows track metadata information which includes Track Title Artist Album Genre Number Total Count Duration ms 2 4 7 AR This command will redial last dialed number Example ar II Redial last dialed number 2 4 8 AV This command increases the volume 2 4 9 AV This command reduces the volume 2 4 10 ATF This command plays the next track by sending an AVRCP volume previous track command to the host DS50002154A page 32 2014 Microchip Technology Inc Command Reference 2 4 11 AT This command plays the previous track by sending an AVRCP volume previous track command to the host 2 4 12 AP This command pauses or starts playback by sending an AVRCP volume pause play command to the host 2413 B The module attempts to reconnect the Bluetooth profiles specified in the connection mask to the most recently paired device Section 2 2 9 SK lt 8 bit hex value gt Use the 0 command to retrieve the Bluetooth profile connection status in byte 0 bits 0 3 The module returns an error if it has not been previously connected or if the connection mask is set to 00 meaning the module is not connectable 2 4 14 C This command instructs
45. t runtime GPIO10 The RN52 EK uses this pin for the volume down button This pin is Runtime Input High active low Configuration GPIO11 The RN52 EK uses this pin for the previous track button This pin is Runtime Input High active low Configuration GPIO12 The RN52 EK uses this pin for the previous track button This pin is Runtime Input High active low Configuration GPIO13 The RN52 EK uses this pin for the previous track button This pin is Runtime Input High active low Configuration 2014 Microchip Technology Inc DS50002154A page 19 Bluetooth Audio Module Command Reference User s Guide 1 6 1 Using GPIO2 to Monitor the Event or Status Register The module contains an event or status register which you can read to determine sta tus changes Status changes include changes to profile connections or voice call con nections You access the register with the o command When you issue this command the module responds with an encoded 2 byte stream of ASCII hex data terminated by the r n characters See Section 2 4 26 Q for more information on using the 0 command The module drives GPIO2 as an output to notify an external microcontroller of an event or status change The microcontroller should enter Command mode and issue the 0 command and parse the response to retrieve the current status The module holds GPIO2 low for 100 ms to indicate a change or event has occurred If a new event occurs the re
46. tail 1 4 1 Discovery Upon power up the module can be set to enter discoverable mode See Figure 1 3 for Bluetooth device scanning examples Bluetooth devices such as smartphones and PCs can discover the module Discovery using a smartphone Open the Bluetooth settings on your smartphone and scan for devices available to pair and connect The device discovers the mod ule and displays it as RN52 XXXX where XXXX is the last 4 digits of the module s MAC address If not already paired the module displays in the available devices list as Not Paired Discovery using a PC Open your PC s Bluetooth device manager and choose to add a new device The Bluetooth device manager s icon is generally located in the bottom right corner of your screen in the taskbar for Windows and in the upper right corner for Mac OS X The Bluetooth device manager displays a list of discov erable Bluetooth devices The module displays as RN52 XXXX where XXXX is the last 4 digits of the module s MAC address 2014 Microchip Technology Inc DS50002154A page 13 Bluetooth Audio Module Command Reference User s Guide The module s label also shows its MAC address The display active configuration com mand also displays the MAC address of the module and the MAC address of the con nected device 1 4 2 Pairing The module supports the following pairing methods e Legacy Pairing using PIN code e Secure Simple Pairing SSP Just Works Numeri
47. tive call The connected audio gateway has an active call and the audio is in the handset 13 Audio streaming The headset is streaming A2DP audio 14 Low battery The system has a low battery 2014 Microchip Technology Inc DS50002154A page 35 Bluetooth Audio Module Command Reference User s Guide Example 0C16 r n Indicates that the A2DP and HFP profiles are connected the call status is active and that an audio mute hold event was received from the phone 2 4 28 R 1 This command forces a complete device reboot similar to a power cycle After you send this command the module responds reboot Note When performing a factory reset using a microcontroller send the R 1 com mand and then wait for the module to return reboot Then drive GPIO9 high to exit Command mode Example R 1 II Reboot the device 2 4 29 T The command displays the caller ID information which includes the name and number of the calling line Use Q to retrieve the caller ID notification event in byte 0 bit 4 value Example T 2 4 30 U This command resets and clears all the previously paired devices in the Paired Device List Example U DS50002154A page 36 2014 Microchip Technology Inc BLUETOOTH AUDIO MODULE COMMAND REFERENCE MICROCHIP USER S GUIDE Appendix A Command Quick Reference Guide This section provides a quick reference of the firmware commands as well as the factory defaults Table
48. with the set command do not take effect until the mod ule has been rebooted unless otherwise noted even though the get command may show otherwise Some example commands are SK 0008 Set the connection profile to HFP GA Display the authentication mode GP Display the pin code Turn on local echo V Display the firmware version D Display the current settings Q Show the connection status 1 4 MAKING A BLUETOOTH CONNECTION By default the Bluetooth module acts as a Bluetooth slave and the PC or smartphone is the Bluetooth master You connect to the Bluetooth module using the Bluetooth device manager which varies depending on your smartphone or computer s operating system In all cases the process is the same e Discovery In the discovery phase the Bluetooth module broadcasts its name profile support and Bluetooth address It is ready for other devices to pair with it Pairing During pairing the Bluetooth module and the Bluetooth master validate the pin code If the pin code validates successfully they exchange security keys and a channel hopping pseudo random sequence Successful pairing results in the module and master establishing link keys Connecting Before connecting the Bluetooth devices must have paired suc cessfully The master initiates a connection the master and slave validate the link keys and a Bluetooth link is established The following sections describe these processes in de
49. y Inc BLUETOOTH AUDIO MODULE COMMAND REFERENCE MICROCHIP USER S GUIDE Appendix B Firmware Revision History The following table provides the firmware revision history TABLE B 1 FIRMWARE RELEASE REVISION Version Description Date 1 08 First release on RN52 EK March 2013 1 09 Added new commands April 2013 IG action command to configure GPIO I amp action command to set get GPIO levels to configure extended features 1 10 Modified s extended features to avoid factory default via SF 1 April 2013 command Extended features must be set with S lt byte gt com mand This was done to support RN52EK configuration on produc tion line 1 11 Fixed an issue with B command not reconnection iAP profile April 2013 1 12 Changed GPIO2 from pulse to latched unlatch mechanism April 2013 1 13 Hardened K FF and B a May 2013 1 16 Added support for optional decoders May 2014 Added UART DFU support HFP wideband support Added HFP three way calling and caller ID support Added audio track meta data support 2014 Microchip Technology Inc DS50002154A page 39 MICROCHIP AMERICAS Corporate Office 2355 West Chandler Blvd Chandler AZ 85224 6199 Tel 480 792 7200 Fax 480 792 7277 Technical Support http www microchip com support Web Address www microchip com Atlanta Duluth GA Tel 678 957 9614 Fax 678 957 1455 Austin TX Tel 512 257 3370 Boston

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