RX610 Group RX-Stick FPU Bouncing Ball Demo
Contents
1. channels are used to drive the display and audio playback D A Converter The DAC is used to drive the speaker for audio output REU05B0149 100 Rev 1 00 Page 2 of 4 Jan 11 2011 RENESAS RX 610 Group RX Stick FPU Bouncing Ball Demo 4 Application Overview A simple floating point calculation is performed to determine the current position of two balls bouncing around the RX Stick s LED display One ball is moved using calculations performed by the FPU while the other is moved using the software floating point library An identical formula is used to compute the location of both balls X position X position X velocity Y position Y position Y velocity 4 1 Position Calculations Each ball is given a three millisecond 0 003 seconds time slice to compute as many position updates as it can The display is then updated to show the new positions of the balls The more calculations completed during the 3 ms time slice the farther the ball travels on each display update providing a visual contrast between the speed of the native FPU hardware and software floating point The number of position updates for each ball is recorded during each time slice and these counts can be viewed in the Watch Window in the debugger Connect the RX Stick to your PC open the HEW workspace and select Build Build All from the menu Once the program builds it is downloaded to the RX Stick and ready for execution Press the Reset Go button on the to2. registers in the FPU to perform floating point math This application note details running the RX Stick FPU Bouncing Ball Demo The demo contrasts the speed of the FPU hardware versus identical calculations carried out with software floating point emulation 2 Application Highlights e Highlights performance of RX Floating Point Unit FPU e Direct comparison of equivalent code running with FPU versus software floating point emulation e The RX has a sophisticated DMA controller that is used to automatically refresh the LED display without requiring any processor overhead e Results are displayed in HEW s watch window 3 References The user manual for the RX Stick is REJ10J2168 RX Stick User Manual The hardware manual for the RX610 is REJ09B0460 RX610 Group Hardware Manual The software manual for the RX610 is REJ09B0435 RX Family Software Manual 3 1 Hardware Manual Relevant Chapters Address Space for details on the memory map of the RX V O Registers provides a complete listing of all registers Clock Generation Circuit for details on how to setup the bus and peripheral clock on the RX Interrupt Control Unit for details on the enabling interrupts from the interrupt controller to the CPU and DMAC DMA Controller DMAC for information on the DMAC used to drive the LED display T O Ports provides information on how to configure port pins for GPIO or peripheral use 16 Bit Timer Pulse Unit TPU a number of timer
3. RENESAS 7 aPPLeaTonnorE RX610 Group REUO5B0149 100 Rev 1 00 RX Stick FPU Bouncing Ball Demo Jan 11 2011 Introduction The following document describes how to run the FPU Bouncing Ball benchmark RX Stick Quick Demo Target Device RX610 Contents 1 ainser e lt Nease a Sin ee a nern Mens een 2 2 Application Highlighis 22 Hs 228 een e aA E EAE EA RAAE 2 2 Rofe N AE ics cn ee ae a aa E a N ad a a e raa aidaa aain 2 d Application Overview sss eee eee eee eee eee eee ee 3 REU05B0149 100 Rev 1 00 Page 1 of 4 Jan 11 2011 RENESAS RX 610 Group RX Stick FPU Bouncing Ball Demo 1 Introduction The RX architecture sets a new benchmark for MCU performance offering 1 65 DMIPS MHz and incorporating powerful features such as an on chip Floating Point Unit FPU DSP like instructions and execution from zero wait state flash memory up to 100 MHz These features make it possible to use the RX for demanding applications that previously were the domain of DSP s Single precision floating point capability is built into the RX in the form of its FPU and native IEEE 754 support General purpose CPU registers store single precision values in IEEE 754 format where floating point instructions in the RX instruction set allow the FPU to operate on them directly dramatically reducing the amount of time necessary to setup and perform floating point operations Other FPU s require the application code to copy operands to and from working
4. able export control laws and regulations and follow the procedures required by such laws and regulations You should not use Renesas Electronics products or the technology described in this document for any purpose relating to military applications or use by the military including but not limited to the development of weapons of mass destruction Renesas Electronics products and technology may not be used for or incorporated into any products or systems whose manufacture use or sale is prohibited under any applicable domestic or foreign laws or regulations 6 Renesas Electronics has used reasonable care in preparing the information included in this document but Renesas Electronics does not warrant that such information is error free Renesas Electronics assumes no liability whatsoever for any damages incurred by you resulting from errors in or omissions from the information included herein 7 Renesas Electronics products are classified according to the following three quality grades Standard High Quality and Specific The recommended applications for each Renesas Electronics product depends on the product s quality grade as indicated below You must check the quality grade of each Renesas Electronics product before using it in a particular application You may not use any Renesas Electronics product for any application categorized as Specific without the prior written consent of Renesas Electronics Further you may not use any Renesas Electronics
5. andle unused pins in accord with the directions given under Handling of Unused Pins in the manual The input pins of CMOS products are generally in the high impedance state In operation with an unused pin in the open circuit state extra electromagnetic noise is induced in the vicinity of LSI an associated shoot through current flows internally and malfunctions occur due to the false recognition of the pin state as an input signal become possible Unused pins should be handled as described under Handling of Unused Pins in the manual 2 Processing at Power on The state of the product is undefined at the moment when power is supplied The states of internal circuits in the LSI are indeterminate and the states of register settings and pins are undefined at the moment when power is supplied In a finished product where the reset signal is applied to the external reset pin the states of pins are not guaranteed from the moment when power is supplied until the reset process is completed In a similar way the states of pins in a product that is reset by an on chip power on reset function are not guaranteed from the moment when power is supplied until the power reaches the level at which resetting has been specified 3 Prohibition of Access to Reserved Addresses Access to reserved addresses is prohibited The reserved addresses are provided for the possible future expansion of functions Do not access these addresses the correct operation
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7. hange without any prior notice Before purchasing or using any Renesas Electronics products listed herein please confirm the latest product information with a Renesas Electronics sales office Also please pay regular and careful attention to additional and different information to be disclosed by Renesas Electronics such as that disclosed through our website 2 Renesas Electronics does not assume any liability for infringement of patents copyrights or other intellectual property rights of third parties by or arising from the use of Renesas Electronics products or technical information described in this document No license express implied or otherwise is granted hereby under any patents copyrights or other intellectual property rights of Renesas Electronics or others You should not alter modify copy or otherwise misappropriate any Renesas Electronics product whether in whole or in part Descriptions of circuits software and other related information in this document are provided only to illustrate the operation of semiconductor products and application examples You are fully responsible for the incorporation of these circuits software and information in the design of your equipment Renesas Electronics assumes no responsibility for any losses incurred by you or third parties arising from the use of these circuits software or information 5 When exporting the products or technology described in this document you should comply with the applic
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9. of LSI is not guaranteed if they are accessed 4 Clock Signals After applying a reset only release the reset line after the operating clock signal has become stable When switching the clock signal during program execution wait until the target clock signal has stabilized When the clock signal is generated with an external resonator or from an external oscillator during a reset ensure that the reset line is only released after full stabilization of the clock signal Moreover when switching to a clock signal produced with an external resonator or by an external oscillator while program execution is in progress wait until the target clock signal is stable 5 Differences between Products Before changing from one product to another i e to a product with a different part number confirm that the change will not lead to problems The characteristics of an MPU or MCU in the same group but having a different part number may differ in terms of the internal memory capacity layout pattern and other factors which can affect the ranges of electrical characteristics such as characteristic values operating margins immunity to noise and amount of radiated noise When changing to a product with a different part number implement a system evaluation test for the given product Notice 1 All information included in this document is current as of the date this document is issued Such information however is subject to c
10. olbar to run the program After a few seconds the ball demo starts The faster ball is being moved by the FPU the slower one by the software floating point library A number of variables can be watched in the watch window to observe the performance of the demo JpuOps shows the number of position updates calculated in the 3 ms time slice using the hardware FPU swOps shows the number of position updates calculated in the 3 ms time slice using software emulation The fpuBall and theBall structures show the current X and Y position and velocity of the balls totalSpeedup is computed after each ball has been given 1 000 time slices and shows the relative performance of the FPU over of the software floating point library It is updated roughly every 6 seconds Try setting a breakpoint on the line of code that calculates totalSpeedup to periodically stop the program and update the watch window The position calculations are identical for both balls but the module Ball c is compiled with the nofpu switch which disables hardware floating point support By contrast Ball_FPU c moves the faster ball and is compiled with native floating point enabled 4 2 LED Display The LED display is used to show the positions of the balls At start up the RX logo is displayed for a few seconds while the intro sound plays The demo program maintains a screen buffer where it plots the bouncing balls A TPU timer channel triggers DMA transfers from the LED
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13. screen buffer to the port pins that drive the LED s updating the display without taking any processing time away from the CPU 4 3 ADPCM Audio Playback When the demo starts and introduction sound is played by decoding ADPCM audio data stored in the RX s flash memory and copying it to the DAC using interrupts triggered by a TPU timer The timer fires at 11 kHz and during each interrupt a single audio sample is decoded using the ADPCM decoder and written to the DAC to drive the speaker through an op amp For a more complete explanation of audio decoding possibilities on the RX see the ADPCM RX Stick Quick Demo REU05B0149 100 Rev 1 00 Page 3 of 4 Jan 11 2011 RENESAS RX 610 Group RX Stick FPU Bouncing Ball Demo Website and Support Renesas Electronics Website http www renesas com Inquiries http www renesas com inquiry All trademarks and registered trademarks are the property of their respective owners REU05B0149 100 Rev 1 00 Page 4 of 4 Jan 11 2011 RENESAS Revision Record Description Rev Date Page Summary 1 0 Jan 11 2011 First edition issued General Precautions in the Handling of MPU MCU Products The following usage notes are applicable to all MPU MCU products from Renesas For detailed usage notes on the products covered by this document refer to the relevant sections of the document as well as any technical updates that have been issued for the products 1 Handling of Unused Pins H
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