MP3 Trigger v2 User Guide
Contents
1. Both responses will be preceded by the character MP3 Trigger Outgoing Message Summary The MP3 Trigger sends the following ASCII messages X When the currently playing track finishes x When the currently playing track is cancelled by a new command E When a requested track doesn t exist error In response to a Status Request Command data byte 0 the MP3 Trigger sends an 18 byte version string e g MP3 Trigger v1 00 In response to a Status Request Command data byte 1 the MP3 Trigger sends the number of MP3 tracks on the currently installed microSD card e g 14 Bootloader The MP3 Trigger v2 has a resident boot loader that allows updating the firmware directly from the microSD card alleviating the need for a hardware programmer Because this boot loader is in located in protected sectors of the PSoC s flash memory it cannot overwrite itself The boot loader will always run on power up thus making it possible to recover from a bad firmware load IMPORTANT NOTE Use of a hardware programmer such as the Cypress MiniProg to program the MP3 Trigger v2 with anything other than the boot loader image will erase the boot loader Don t do it Using the boot loader To update the MP3 Trigger v2 firmware copy the new firmware hex file to a FAT16 formatted micro SD card and re name the file to MP3TRIGR HEX It doesn t matter if it s the only file on the microSD card or not th2. P2 will be started where NNN is the ASCII equivalent of the data byte n Command Play binary Number of bytes 2 Command byte p Data byte n 0 to 255 Comments If it exists the nth track in the directory will be played The total number of available tracks in the directory can be retrieved using Status Request command below 2009 SparkFun Electronics Inc All Rights Reserved Product features specifications system requirements and availability are subject to change without notice MP3 4 Trigger WIG 09356 is a trademark of SparkFun Electronics Inc All other trademarks contained herein are the property of their respective owners A MP3TRIGGER_UG_090917 X ROHS s spar A n sparkfun com p kpa 6175 LONGBOW DRIVE SUITE 200 zP cove 80301 ZIP CODE ze cove 80301 303 LECT NICS BOULDER COLORADO USA MP3 Trigger v2 User Guide 2010 04 16 Command Set Volume binary Number of bytes 2 Command byte v Data byte n 0 to 255 Comments The VS1053 volume will be set to the value n Per the VS1053 datasheet maximum volume is 0x00 and values much above 0x40 are too low to be audible Command Status Request ASCII Number of bytes 2 Command byte S Data byte N ASCII 0 through 1 Comments If N 0 the MP3 Trigger will respond with a version string If N 1 the MP3 Trigger will respond with the total number of tracks on the installed microSD card in ASCII
3. The MP3 Trigger provides 18 input pins TRIGO1 TRIG18 that can be used to trigger specific MP3 tracks on the microSD card Use the following file naming convention to associate a particular track with a trigger TRIGO1 filename TRACKO01 MP3 TRIGO2 filename TRACKO02 MP3 TRIG18 filename TRACK018 MP3 These inputs are active low and pulled high internally Therefore they can be activated either by digital outputs from another microcontroller such as an Arduino or by a simple contact closure switch to ground The inputs support voltage levels of either 5V or 3 3V The trigger inputs are made available on the even numbered pins of a dual row connector and all the opposing odd numbered pins are ground making it easy to wire individual switches or contact closures directly to the MP3 Trigger board Activation of a trigger immediately causes the corresponding track to play if it exists Installing a 36 pin dual row header allows shunt jumpers to be installed on the trigger inputs to automatically sequence and loop tracks on power up as follows When a triggered track reaches the end the MP3 Trigger looks to see if any trigger inputs are active and will automatically start another track if so If only the same trigger is active then that track will restart loop If other triggers are active the MP3 Trigger will always start the next higher trigger track wrapping back to 1 after 18 This combined with the
4. can be typed on a keyboard 2 byte commands starting with a lower case character require a binary value 0 255 as the second byte Bytes sent to the MP3 Trigger are not echoed If echoing is required set your terminal program to echo locally Command Summary Command Navigation Start Stop Number of bytes 1 Command byte O Data byte none Comments This command performs the same function as pushing the on board nav switch center position If the current track is playing it stops If the current track is stopped it will restart from the beginning Command Navigation Forward Number of bytes 1 Command byte F Data byte none Comments This command performs the same function as pushing the on board nav switch right position The next MP3 track in the directory will be started Command Navigation Reverse Number of bytes 1 Command byte R Data byte none Comments This command performs the same function as pushing the on board nav switch left position The previous MP3 track in the directory will be started Command Trigger ASCII Number of bytes 2 Command byte T Data byte N ASCII 1 through 9 Comments If it exists the track with the filename TRACKOON MP3 will be started where N is the data byte Command Trigger binary Number of bytes 2 Command byte t Data byte n 1 to 255 Comments If it exists the track with the filename TRACKNNN M
5. doesn t exist on the card it will blink the status LED very rapidly forever If it finds and is able to open the file it begins to program the PSoC Flash with the contents of the firmware file The status LED will illuminate for each hex record programmed If it successfully programs the entire file the status LED will turn solid upon completion You can then power cycle the MP3 Trigger and you will be running the new firmware don t hold the nav switch down again or you will simply re enter the boot loader If there s a flash memory programming error or you pull the microSD card out before it finishes for example the sta tus LED will indicate a bad programming cycle by blinking briefly at about 1 Hz This looks very different than the blinking for programming records You need to cycle the power again holding the nav switch to re enter the boot loader The key is that the boot loader cannot over write any part of itself no matter what s in the firmware image file The worst thing that can happen is you load bad firmware and the board won t run But you can always hold the nav switch down on power up and get into the boot loader to load new firmware 2009 SparkFun Electronics Inc All Rights Reserved Product features specifications system requirements and availability are subject to change without notice MP3 6 Trigger WIG 09356 is a trademark of SparkFun Electronics Inc All other trademarks contained herein are the property of their re
6. e boot loader will find it as long as it has this exact filename Insert the microSD card into the MP3 Trigger v2 with the power off Hold down the center nav switch while turning on the power Wait for the status LED to go solid then power cycle the MP3 Trigger to run the new firmware 2009 SparkFun Electronics Inc All Rights Reserved Product features specifications system requirements and availability are subject to change without notice MP3 5 Trigger WIG 09356 is a trademark of SparkFun Electronics Inc All other trademarks contained herein are the property of their respective owners A MP3TRIGGER_UG_090917 X ROHS s spa fun sparkfun com u gt 6175 LONGBOW DRIVE SUITE 200 zip cone 80301 303 ELECTRONICS BOULDER COLORADO USA MP3 Trigger v2 User Guide 2010 04 16 Here s how the boot loader works in more detail The boot loader is always entered whenever the board powers up The first thing it does is look to see if the center nav switch is being held down If not it immediately vectors to the start of the firmware Note that if you have previ ously loaded bad firmware the board will simply halt or do whatever your bad code tells it to do possibly with no ac tivity other than the power LED This is normal if there s no good firmware loaded If the center nav switch is being held on power up the boot loader searches the microSD card directory for a file named MP3TRIGR HEX If there s no card installed or the file
7. fa ip 4 sd Fa G G AA a EN w 1 WAH UL 2009 SparkFun Electronics Inc All Rights Reserved Product features specifications system requirements and availability are subject to change without notice MP3 1 Trigger WIG 09356 is a trademark of SparkFun Electronics Inc All other trademarks contained herein are the property of their respective owners MP3TRIGGER_UG_090917 X a gt fu sparkfun com l i 6175 LONGBOW DRIVE SUITE 200 303 LECTRONICS BOULDER COLORADO USA 00 80801 MP3 Trigger v2 User Guide 2010 04 16 Specifications Input Voltage Range 4 5V to 12 0V DC or regulated 3 3V jumper selectable Current Consumption Approximately 45mA idle 85mA playing File system FAT16 Audio output Line level stereo 1 8 stereo jack Trigger inputs Logic level 3 3V 5 0V active low inputs w internal pull ups Connector provides individual grounds allowing switches or jumpers to be connected directly to each trigger input Serial Full duplex 8 bit 38 4Kbaud Figure 2 Basic Operation Simply transfer the desired MP3 files onto a microSD flash card using a PC The MP3 Trigger currently supports only FAT16 formatting Most microSD cards of 2GB or less are pre formatted with FAT16 Cards larger than 2G and smaller cards formatted with FAT32 will need to be reformatted to work with the MP3 Trigger The MP3 Trigger does not currently support hot swapping of the microSD Card While this w
8. fact that the MP3 Trigger will automatically start the lowest numbered active trigger on power up means that by installing shunt jumpers on the trigger inputs the MP3 Trigger can be set to automatically sequence and loop from 1 to 18 tracks on power up with no externally programming or control required Serial Control Protocol The MP8 Trigger comes with a full duplex 3 3 5V serial TTL interface that allows for control of all the MP3 tracks up to 256 on the microSD card as well as volume You can use our FTDI Basic DEV 09115 or connect to any serial interface that uses the format 38 4Kbps 8 bits 1 start 1 stop no parity flow control none All commands to the MP3 Trigger are 1 or 2 bytes in length 1 byte commands are upper case ASCII characters 2009 SparkFun Electronics Inc All Rights Reserved Product features specifications system requirements and availability are subject to change without notice MP3 3 Trigger WIG 09356 is a trademark of SparkFun Electronics Inc All other trademarks contained herein are the property of their respective owners A MP3TRIGGER_UG_090917 X ROHS s spar fun sparkfun com E RO gt 6175 LONGBOW DRIVE SUITE 200 a cone 80301 Pa ze cove 80301 303 LECT NICS BOULDER COLORADO USA MP3 Trigger v2 User Guide 2010 04 16 2 byte commands start with an ASCII character Those starting with an upper case character use an ASCII value 0 9 as the second byte These commands
9. ill not damage anything the microSD media is only initialized during power up So whenever the card is changed or updated be sure to power cycle the MP3 Trigger after installing the card When power is applied the MP3 Trigger the on board green status LED indicates the state of the installed media as follows 1 long blink No formatted microSD media found 1 long blink followed by 1 short blink microSD media found no MP3 files located Constant short blinks Hardware problem with MP3 Decoder 3 short blinks microSD media found at least 1 MP3 file located 2009 SparkFun Electronics Inc All Rights Reserved Product features specifications system requirements and availability are subject to change without notice MP3 2 Trigger WIG 09356 is a trademark of SparkFun Electronics Inc All other trademarks contained herein are the property of their respective owners A MP3TRIGGER_UG_090917 X ROHS s spar A n sparkfun com p kpa 6175 LONGBOW DRIVE SUITE 200 zP cove 80301 ZIP CODE ze cove 80301 303 LECT NICS BOULDER COLORADO USA MP3 Trigger v2 User Guide 2010 04 16 As soon as the MP3 Trigger powers up with 3 short blinks the on board navigation switch can be used to play all of the tracks on the card regardless of the filenames Left Plays the previous MP3 file in the directory Right Plays the next MP3 file in the directory Center Starts Stops the current MP3 file Using the Trigger Inputs
10. spa sparkfun com l i 6175 LONGBOW DRIVE SUITE 200 303 ELECTRONICS BOULDER COLORADO USA PE 80301 MP3 Trigger v2 User Guide 2010 04 16 Overview The MP3 Trigger v2 is a versatile low cost low power embedded audio unit that plays MP3 tracks directly from a FAT16 formatted microSD flash card to a stereo line level 1 8 output jack supporting up to 192Kbps stereo playback The board has 18 external input pins that when pulled to ground trigger pre selected MP3 tracks anda full duplex serial control port that provides real time volume control as well remote triggering for up to 255 tracks There is also an on board navigation switch for local access and playback of all MP3 tracks on the flash card The MP3 Trigger v2 has a resident permanent boot loader that enables firmware upgrades directly from the microSD card without the need for a hardware programming device The basic layout of the MP3 Trigger can be seen in Figure 1 below 1 USB or external power switch 2 External power connector 5 5x2 1mm center positive 3 UART and USB power interface for the FTDI Basic DEV 091 15 4 Power selection jumper 5 Trigger pins 6 1 8 stereo jack 7 Navigation switch 8 microSD socket Figure 1 rr wri Xx v2 f a e Maddog Gee AL yl Y O TRIGI7 Vas pice TIP Sholmigger ee WY 10 ere robepeean i ds es SOR Ges re LLL N OO TRIGA ges NM Mix DOme 0 iiiiiiiiiiiiii usBucc O St aSr oF 5 sb 4 SUA a
11. spective owners A MP3TRIGGER_UG_090917 X ROHS s
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