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Re: VERY URGENT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! SOMEBODY PLEEASE HELP ME!!!!!!!!!!!!!!

Started by Jeff Brower December 13, 2007
Fons-

> Hey everyone.. I have a serious serious issue right now. I have a
> project due immediately and if I don't get it done I won't graduate.
> I'm trying to program my C6713 DSK for processing an audio signal to
> create audio effects, I want to be able to pick an effect using the
> DIP switches located on the DSK board. All I need to know, is where in
> this C6713 DSK BSL example file, called dsk_app.c (shown below), that
> comes included with the C6713 DSK Code Composer Studio 3.1 package,
> could I possibly process the incoming audio signal for effects?

You can start by experimenting with code inserted prior to the copyData() function
calls. If you "do something" to data in the Rcv buffers prior to copying them to the
Xmt buffers, you should hear the results. For example, make the Rcv buffers all
zeros, you should get silence. Put in a 1 kHz sine wave, you should hear a tone. Go
from there.

Remember, you have to modify both the 'ping' and 'pong' buffers in order to get
smooth, continuous output. You should think about that carefully, for instance if
you apply a filter then in some cases the filter will "cross" the buffer boundary and
your code must deal with that.

-Jeff

PS. When replying, please post to the group, not to me.

> I have
> the effect algorithms, I just really need to implement them with this
> code because I really don't know how else to go about designing this.
> This file seems to have everything I need I just can't figure out how
> and where to insert my code to do the audio signal processing to
> create effects like echo and distortion. All this program does
> currently, is take the audio signal from line in and pass it through
> to line out. I'm becoming desperate, if anyone knows how to do this
> please can you immediately send me a message! I'm even willing to pay!
> I just need to get this dome somehow! Thank you very very much for
> your time, I greatly appreciate any and all the help I can get.
> Thanks again,
> -Fons
>
> /*
> * Copyright 2003 by Spectrum Digital Incorporated.
> * All rights reserved. Property of Spectrum Digital Incorporated.
> */
>
> /*
> * ======== dsk_app.c =======> *
> * Version 1.00
> *
> * This example digitally processes audio data from the line input on the
> * AIC23 codec and plays the result on the line output. It uses the
> McBSP
> * and EDMA to efficiently handle the data transfer without
> intervention from
> * the DSP.
> *
> * Data transfer
> *
> * Audio data is transferred back and forth from the codec through
> McBSP2,
> * a bidirectional serial port. The EDMA is configured to take every
> 16-bit
> * signed audio sample arriving on McBSP1 and store it in a buffer in
> memory
> * until it can be processed. Once it has been processed, the EDMA
> * controller sends the data back to McBSP1 for transmission.
> *
> * A second serial port, McBSP0 is used to control/configure the
> AIC23. The
> * codec receives serial commands through McBSP0 that set configuration
> * parameters such as volume, sample rate and data format.
> *
> * In addition to basic EDMA transfers, this example uses 2 special
> * techniques to make audio processing more convenient and efficient:
> *
> * 1) Ping-pong data buffering in memory
> * 2) Linked EDMA transfers
> *
> * Applications with single buffers for receive and transmit data are
> * very tricky and timing dependent because new data constantly
> overwrites
> * the data being transmitted. Ping-pong buffering is a technique
> where two
> * buffers (referred to as the PING buffer and the PONG buffer) are
> used for
> * a data transfer instead of only one. The EDMA is configured to
> fill the
> * PING buffer first, then the PONG buffer. While the PONG buffer is
> being
> * filled, the PING buffer can be processed with the knowledge that the
> * current EDMA transfer won't overwrite it. This example uses ping-pong
> * buffers on both transmit and receive ends for a total of four buffers.
> *
> * The EDMA controller must be configured slightly differently for each
> * buffer. When a buffer is filled, the EDMA controller generates an
> * interrupt. The interrupt handler must reload the configuration
> * for the next buffer before the next audio sample arrives. An EDMA
> * feature called linked transfers is used to make this event less time
> * critical. Each configuration is created in advance and the EDMA
> * controller automatically links to the next configuration when the
> * current configuration is finished. An interrupt is still generated,
> * but it serves only to signal the DSP that it can process the data.
> * The only time constraint is that all the audio data must be processed
> * before the the active buffer fills up, which is much longer than the
> * time between audio samples. It is much easier to satisfy real-time
> * constraints with this implementation.
> *
> * Program flow
> *
> * When the program is run, the individual DSP/BIOS modules are
> initialized
> * as configured in dsk_app.cdb with the DSP/BIOS configuration tool.
> The
> * main() function is then called as the main user thread. In this
> example
> * main() performs application initialization and starts the EDMA data
> * transfers. When main exits, control passes back entirely to DSP/BIOS
> * which services any interrupts or threads on an as-needed basis.
> *
> * The edmaHwi() interrupt service routine is called when a buffer
> has been
> * filled. It contains a state variable named pingOrPong that indicates
> * whether the buffer is a PING or PONG buffer. dmaHwi switches the
> buffer
> * state to the opposite buffer and calls the SWI thread processBuffer to
> * process the audio data.
> *
> * Other Functions
> *
> * The example includes a few other functions that are executed in the
> * background as examples of the multitasking that DSP/BIOS is
> capable of:
> *
> * 1) blinkLED() toggles LED #0 every 500ms if DIP switch #0 is
> depressed.
> * It is a periodic thread with a period of 500 ticks.
> *
> * 2) load() simulates a 20-25% dummy load if DIP switch #1 is
> depressed.
> * It represents other computation that may need to be done. It is a
> * periodic thread with a period of 10ms.
> *
> * Please see the 6713 DSK help file under Software/Examples for more
> * detailed information on this example.
> */
>
> /*
> * DSP/BIOS is configured using the DSP/BIOS configuration tool.
> Settings
> * for this example are stored in a configuration file called
> dsk_app.cdb.
> * At compile time, Code Composer will auto-generate DSP/BIOS related
> files
> * based on these settings. A header file called dsk_appcfg.h
> contains the
> * results of the autogeneration and must be included for proper
> operation.
> * The name of the file is taken from dsk_app.cdb and adding cfg.h.
> */
> #include "dsk_appcfg.h"
>
> /*
> * These are include files that support interfaces to BIOS and CSL
> modules
> * used by the program.
> */
> #include
> #include
> #include
> #include
> #include
> #include
> #include
> #include /*
> * The 6713 DSK Board Support Library is divided into several
> modules, each
> * of which has its own include file. The file dsk6713.h must be
> included
> * in every program that uses the BSL. This example also uses the
> * DIP, LED and AIC23 modules.
> */
> #include "dsk6713.h"
> #include "dsk6713_led.h"
> #include "dsk6713_dip.h"
> #include "aic23.h"
>
> /* Function prototypes */
> void initIrq(void);
> void initMcbsp(void);
> void initEdma(void);
> void copyData(Int16 *inbuf, Int16 *outbuf, Int16 length);
> void processBuffer(void);
> void edmaHwi(void);
>
> /* Constants for the buffered ping-pong transfer */
> #define BUFFSIZE 1000
> #define PING 0
> #define PONG 1
>
> /*
> * Data buffer declarations - the program uses four logical buffers of
> size
> * BUFFSIZE, one ping and one pong buffer on both receive and transmit
> sides.
> */
> Int16 gBufferXmtPing[BUFFSIZE]; // Transmit PING buffer
> Int16 gBufferXmtPong[BUFFSIZE]; // Transmit PONG buffer
>
> Int16 gBufferRcvPing[BUFFSIZE]; // Receive PING buffer
> Int16 gBufferRcvPong[BUFFSIZE]; // Receive PONG buffer
>
> EDMA_Handle hEdmaXmt; // EDMA channel handles
> EDMA_Handle hEdmaReloadXmtPing;
> EDMA_Handle hEdmaReloadXmtPong;
> EDMA_Handle hEdmaRcv;
> EDMA_Handle hEdmaReloadRcvPing;
> EDMA_Handle hEdmaReloadRcvPong;
>
> MCBSP_Handle hMcbsp1; // McBSP1 (codec data) handle
>
> Int16 gXmtChan; // TCC codes (see initEDMA())
> Int16 gRcvChan;
>
> /*
> * EDMA Config data structure
> */
>
> /* Transmit side EDMA configuration */
> EDMA_Config gEdmaConfigXmt = {
> EDMA_FMKS(OPT, PRI, HIGH) | // Priority
> EDMA_FMKS(OPT, ESIZE, 16BIT) | // Element size
> EDMA_FMKS(OPT, 2DS, NO) | // 2 dimensional source?
> EDMA_FMKS(OPT, SUM, INC) | // Src update mode
> EDMA_FMKS(OPT, 2DD, NO) | // 2 dimensional dest
> EDMA_FMKS(OPT, DUM, NONE) | // Dest update mode
> EDMA_FMKS(OPT, TCINT, YES) | // Cause EDMA interrupt?
> EDMA_FMKS(OPT, TCC, OF(0)) | // Transfer complete code
> EDMA_FMKS(OPT, LINK, YES) | // Enable link parameters?
> EDMA_FMKS(OPT, FS, NO), // Use frame sync?
>
> (Uint32)&gBufferXmtPing, // Src address
>
> EDMA_FMK (CNT, FRMCNT, NULL) | // Frame count
> EDMA_FMK (CNT, ELECNT, BUFFSIZE), // Element count
>
> EDMA_FMKS(DST, DST, OF(0)), // Dest address
>
> EDMA_FMKS(IDX, FRMIDX, DEFAULT) | // Frame index value
> EDMA_FMKS(IDX, ELEIDX, DEFAULT), // Element index value
>
> EDMA_FMK (RLD, ELERLD, NULL) | // Reload element
> EDMA_FMK (RLD, LINK, NULL) // Reload link
> };
>
> /* Receive side EDMA configuration */
> EDMA_Config gEdmaConfigRcv = {
> EDMA_FMKS(OPT, PRI, HIGH) | // Priority
> EDMA_FMKS(OPT, ESIZE, 16BIT) | // Element size
> EDMA_FMKS(OPT, 2DS, NO) | // 2 dimensional source?
> EDMA_FMKS(OPT, SUM, NONE) | // Src update mode
> EDMA_FMKS(OPT, 2DD, NO) | // 2 dimensional dest
> EDMA_FMKS(OPT, DUM, INC) | // Dest update mode
> EDMA_FMKS(OPT, TCINT, YES) | // Cause EDMA interrupt?
> EDMA_FMKS(OPT, TCC, OF(0)) | // Transfer complete code
> EDMA_FMKS(OPT, LINK, YES) | // Enable link parameters?
> EDMA_FMKS(OPT, FS, NO), // Use frame sync?
>
> EDMA_FMKS(SRC, SRC, OF(0)), // Src address
>
> EDMA_FMK (CNT, FRMCNT, NULL) | // Frame count
> EDMA_FMK (CNT, ELECNT, BUFFSIZE), // Element count
>
> (Uint32)&gBufferRcvPing, // Dest address
>
> EDMA_FMKS(IDX, FRMIDX, DEFAULT) | // Frame index value
> EDMA_FMKS(IDX, ELEIDX, DEFAULT), // Element index value
>
> EDMA_FMK (RLD, ELERLD, NULL) | // Reload element
> EDMA_FMK (RLD, LINK, NULL) // Reload link
> };
>
> /* McBSP codec data channel configuration */
> static MCBSP_Config mcbspCfg1 = {
> MCBSP_FMKS(SPCR, FREE, NO) |
> MCBSP_FMKS(SPCR, SOFT, NO) |
> MCBSP_FMKS(SPCR, FRST, YES) |
> MCBSP_FMKS(SPCR, GRST, YES) |
> MCBSP_FMKS(SPCR, XINTM, XRDY) |
> MCBSP_FMKS(SPCR, XSYNCERR, NO) |
> MCBSP_FMKS(SPCR, XRST, YES) |
> MCBSP_FMKS(SPCR, DLB, OFF) |
> MCBSP_FMKS(SPCR, RJUST, RZF) |
> MCBSP_FMKS(SPCR, CLKSTP, DISABLE) |
> MCBSP_FMKS(SPCR, DXENA, OFF) |
> MCBSP_FMKS(SPCR, RINTM, RRDY) |
> MCBSP_FMKS(SPCR, RSYNCERR, NO) |
> MCBSP_FMKS(SPCR, RRST, YES),
>
> MCBSP_FMKS(RCR, RPHASE, SINGLE) |
> MCBSP_FMKS(RCR, RFRLEN2, DEFAULT) |
> MCBSP_FMKS(RCR, RWDLEN2, DEFAULT) |
> MCBSP_FMKS(RCR, RCOMPAND, MSB) |
> MCBSP_FMKS(RCR, RFIG, NO) |
> MCBSP_FMKS(RCR, RDATDLY, 0BIT) |
> MCBSP_FMKS(RCR, RFRLEN1, OF(1)) |
> MCBSP_FMKS(RCR, RWDLEN1, 16BIT) |
> MCBSP_FMKS(RCR, RWDREVRS, DISABLE),
>
> MCBSP_FMKS(XCR, XPHASE, SINGLE) |
> MCBSP_FMKS(XCR, XFRLEN2, DEFAULT) |
> MCBSP_FMKS(XCR, XWDLEN2, DEFAULT) |
> MCBSP_FMKS(XCR, XCOMPAND, MSB) |
> MCBSP_FMKS(XCR, XFIG, NO) |
> MCBSP_FMKS(XCR, XDATDLY, 0BIT) |
> MCBSP_FMKS(XCR, XFRLEN1, OF(1)) |
> MCBSP_FMKS(XCR, XWDLEN1, 16BIT) |
> MCBSP_FMKS(XCR, XWDREVRS, DISABLE),
>
> MCBSP_FMKS(SRGR, GSYNC, DEFAULT) |
> MCBSP_FMKS(SRGR, CLKSP, DEFAULT) |
> MCBSP_FMKS(SRGR, CLKSM, DEFAULT) |
> MCBSP_FMKS(SRGR, FSGM, DEFAULT) |
> MCBSP_FMKS(SRGR, FPER, DEFAULT) |
> MCBSP_FMKS(SRGR, FWID, DEFAULT) |
> MCBSP_FMKS(SRGR, CLKGDV, DEFAULT),
>
> MCBSP_MCR_DEFAULT,
> MCBSP_RCER_DEFAULT,
> MCBSP_XCER_DEFAULT,
>
> MCBSP_FMKS(PCR, XIOEN, SP) |
> MCBSP_FMKS(PCR, RIOEN, SP) |
> MCBSP_FMKS(PCR, FSXM, EXTERNAL) |
> MCBSP_FMKS(PCR, FSRM, EXTERNAL) |
> MCBSP_FMKS(PCR, CLKXM, INPUT) |
> MCBSP_FMKS(PCR, CLKRM, INPUT) |
> MCBSP_FMKS(PCR, CLKSSTAT, DEFAULT) |
> MCBSP_FMKS(PCR, DXSTAT, DEFAULT) |
> MCBSP_FMKS(PCR, FSXP, ACTIVEHIGH) |
> MCBSP_FMKS(PCR, FSRP, ACTIVEHIGH) |
> MCBSP_FMKS(PCR, CLKXP, FALLING) |
> MCBSP_FMKS(PCR, CLKRP, RISING)
> };
>
> /* Codec configuration settings */
> AIC23_Params config = {
> 0x0017, // 0 DSK6713_AIC23_LEFTINVOL Left line input channel volume
> 0x0017, // 1 DSK6713_AIC23_RIGHTINVOL Right line input channel volume
> 0x00d8, // 2 DSK6713_AIC23_LEFTHPVOL Left channel headphone volume
> 0x00d8, // 3 DSK6713_AIC23_RIGHTHPVOL Right channel headphone volume
> 0x0011, // 4 DSK6713_AIC23_ANAPATH Analog audio path control
> 0x0000, // 5 DSK6713_AIC23_DIGPATH Digital audio path control
> 0x0000, // 6 DSK6713_AIC23_POWERDOWN Power down control
> 0x0043, // 7 DSK6713_AIC23_DIGIF Digital audio interface format
> 0x0001, // 8 DSK6713_AIC23_SAMPLERATE Sample rate control
> 0x0001 // 9 DSK6713_AIC23_DIGACT Digital interface activation
> };
>
> /* --------------------------- main() function
> -------------------------- */
> /*
> * main() - The main user task. Performs application initialization and
> * starts the data transfer.
> */
> void main()
> {
> /* Initialize Board Support Library */
> DSK6713_init();
>
> /* Initialize LEDs and DIP switches */
> DSK6713_LED_init();
> DSK6713_DIP_init();
>
> /* Clear buffers */
> memset((void *)gBufferXmtPing, 0, BUFFSIZE * 4 * 2);
>
> AIC23_setParams(&config); // Configure the codec
>
> initMcbsp(); // Initialize McBSP1 for audio transfers
>
> IRQ_globalDisable(); // Disable global interrupts during setup
>
> initEdma(); // Initialize the EDMA controller
>
> initIrq(); // Initialize interrupts
>
> IRQ_globalEnable(); // Re-enable global interrupts
> }
>
> /* ------------------------Helper Functions
> ----------------------------- */
>
> /*
> * initMcbsp() - Initialize the McBSP for codec data transfers using the
> * configuration define at the top of this file.
> */
> void initMcbsp()
> {
> /* Open the codec data McBSP */
> hMcbsp1 = MCBSP_open(MCBSP_DEV1, MCBSP_OPEN_RESET);
>
> /* Configure the codec to match the AIC23 data format */
> MCBSP_config(hMcbsp1, &mcbspCfg1);
>
> /* Start the McBSP running */
> MCBSP_start(hMcbsp1, MCBSP_XMIT_START | MCBSP_RCV_START |
> MCBSP_SRGR_START | MCBSP_SRGR_FRAMESYNC, 220);
> }
>
> /*
> * initIrq() - Initialize and enable the DMA receive interrupt using
> the CSL.
> * The interrupt service routine for this interrupt is
> edmaHwi.
> */
> void initIrq(void)
> {
> /* Enable EDMA interrupts to the CPU */
> IRQ_clear(IRQ_EVT_EDMAINT); // Clear any pending EDMA interrupts
> IRQ_enable(IRQ_EVT_EDMAINT); // Enable EDMA interrupt
> }
>
> /*
> * initEdma() - Initialize the DMA controller. Use linked transfers to
> * automatically transition from ping to pong and
> visa-versa.
> */
> void initEdma(void)
> {
> /* Configure transmit channel */
> hEdmaXmt = EDMA_open(EDMA_CHA_XEVT1, EDMA_OPEN_RESET); // get
> hEdmaXmt handle and reset channel
> hEdmaReloadXmtPing = EDMA_allocTable(-1); // get
> hEdmaReloadXmtPing handle
> hEdmaReloadXmtPong = EDMA_allocTable(-1); // get
> hEdmaReloadXmtPong handle
>
> gEdmaConfigXmt.dst = MCBSP_getXmtAddr(hMcbsp1); // set the
> desination address to McBSP1 DXR
>
> gXmtChan = EDMA_intAlloc(-1); // get an
> open TCC
> gEdmaConfigXmt.opt |= EDMA_FMK(OPT,TCC,gXmtChan); // set TCC
> to gXmtChan
>
> EDMA_config(hEdmaXmt, &gEdmaConfigXmt); // then
> configure the registers
> EDMA_config(hEdmaReloadXmtPing, &gEdmaConfigXmt); // and the
> reload for Ping
>
> gEdmaConfigXmt.src = EDMA_SRC_OF(gBufferXmtPong); // change
> the structure to have a source of Pong
> EDMA_config(hEdmaReloadXmtPong, &gEdmaConfigXmt); // and
> configure the reload for Pong
>
> EDMA_link(hEdmaXmt,hEdmaReloadXmtPong); // link
> the regs to Pong
> EDMA_link(hEdmaReloadXmtPong,hEdmaReloadXmtPing); // link
> Pong to Ping
> EDMA_link(hEdmaReloadXmtPing,hEdmaReloadXmtPong); // and
> link Ping to Pong
>
> /* Configure receive channel */
> hEdmaRcv = EDMA_open(EDMA_CHA_REVT1, EDMA_OPEN_RESET); // get
> hEdmaRcv handle and reset channel
> hEdmaReloadRcvPing = EDMA_allocTable(-1); // get
> hEdmaReloadRcvPing handle
> hEdmaReloadRcvPong = EDMA_allocTable(-1); // get
> hEdmaReloadRcvPong handle
>
> gEdmaConfigRcv.src = MCBSP_getRcvAddr(hMcbsp1); // and the
> desination address to McBSP1 DXR
>
> gRcvChan = EDMA_intAlloc(-1); // get an
> open TCC
> gEdmaConfigRcv.opt |= EDMA_FMK(OPT,TCC,gRcvChan); // set TCC
> to gRcvChan
>
> EDMA_config(hEdmaRcv, &gEdmaConfigRcv); // then
> configure the registers
> EDMA_config(hEdmaReloadRcvPing, &gEdmaConfigRcv); // and the
> reload for Ping
>
> gEdmaConfigRcv.dst = EDMA_DST_OF(gBufferRcvPong); // change
> the structure to have a destination of Pong
> EDMA_config(hEdmaReloadRcvPong, &gEdmaConfigRcv); // and
> configure the reload for Pong
>
> EDMA_link(hEdmaRcv,hEdmaReloadRcvPong); // link
> the regs to Pong
> EDMA_link(hEdmaReloadRcvPong,hEdmaReloadRcvPing); // link
> Pong to Ping
> EDMA_link(hEdmaReloadRcvPing,hEdmaReloadRcvPong); // and
> link Ping to Pong
>
> /* Enable interrupts in the EDMA controller */
> EDMA_intClear(gXmtChan);
> EDMA_intClear(gRcvChan); // clear
> any possible spurious interrupts
>
> EDMA_intEnable(gXmtChan); // enable
> EDMA interrupts (CIER)
> EDMA_intEnable(gRcvChan); // enable
> EDMA interrupts (CIER)
>
> EDMA_enableChannel(hEdmaXmt); // enable
> EDMA channel
> EDMA_enableChannel(hEdmaRcv); // enable
> EDMA channel
>
> /* Do a dummy write to generate the first McBSP transmit event */
> MCBSP_write(hMcbsp1, 0);
> }
>
> /*
> * copyData() - Copy one buffer with length elements to another.
> */
> void copyData(Int16 *inbuf, Int16 *outbuf, Int16 length)
> {
> Int16 i = 0;
>
> for (i = 0; i < length; i++) {
> outbuf[i] = inbuf[i];
> }
> }
>
> /* ---------------------- Interrupt Service Routines
> -------------------- */
>
> /*
> * edmaHwi() - Interrupt service routine for the DMA transfer. It is
> * triggered when a complete DMA receive frame has been
> * transferred. The edmaHwi ISR is inserted into the
> interrupt
> * vector table at compile time through a setting in the
> DSP/BIOS
> * configuration under Scheduling --> HWI --> HWI_INT8.
> edmaHwi
> * uses the DSP/BIOS Dispatcher to save register state
> and make
> * sure the ISR co-exists with other DSP/BIOS functions.
> */
> void edmaHwi(void)
> {
> static Uint32 pingOrPong = PING; // Ping-pong state variable
> static Int16 xmtdone = 0, rcvdone = 0;
>
> /* Check CIPR to see which transfer completed */
> if (EDMA_intTest(gXmtChan))
> {
> EDMA_intClear(gXmtChan);
> xmtdone = 1;
> }
> if (EDMA_intTest(gRcvChan))
> {
> EDMA_intClear(gRcvChan);
> rcvdone = 1;
> }
>
> /* If both transfers complete, signal processBufferSwi to handle */
> if (xmtdone && rcvdone)
> {
> if (pingOrPong==PING)
> {
> SWI_or(&processBufferSwi, PING);
> pingOrPong = PONG;
> } else
> {
> SWI_or(&processBufferSwi, PONG);
> pingOrPong = PING;
> }
> rcvdone = 0;
> xmtdone = 0;
> }
> }
>
> /* ------------------------------- Threads
> ------------------------------ */
>
> /*
> * processBuffer() - Process audio data once it has been received.
> */
> void processBuffer(void)
> {
> Uint32 pingPong;
>
> /* Get contents of mailbox posted by edmaHwi */
> pingPong = SWI_getmbox();
>
> /* Copy data from transmit to receive, could process audio here */
> if (pingPong == PING) {
> /* Toggle LED #3 as a visual cue */
> DSK6713_LED_toggle(3);
>
> /* Copy receive PING buffer to transmit PING buffer */
> copyData(gBufferRcvPing, gBufferXmtPing, BUFFSIZE);
> } else {
> /* Toggle LED #2 as a visual cue */
> DSK6713_LED_toggle(2);
>
> /* Copy receive PONG buffer to transmit PONG buffer */
> copyData(gBufferRcvPong, gBufferXmtPong, BUFFSIZE);
> }
> }
>
> /*
> * blinkLED() - Periodic thread (PRD) that toggles LED #0 every 500ms if
> * DIP switch #0 is depressed. The thread is configured
> * in the DSP/BIOS configuration tool under Scheduling -->
> * PRD --> PRD_blinkLed. The period is set there at 500
> * ticks, with each tick corresponding to 1ms in real
> * time.
> */
> void blinkLED(void)
> {
> /* Toggle LED #0 if DIP switch #0 is off (depressed) */
> if (!DSK6713_DIP_get(0))
> DSK6713_LED_toggle(0);
> }
>
> /*
> * load() - PRD that simulates a 20-25% dummy load on a 225MHz 6713 if
> * DIP switch #1 is depressed. The thread is configured in
> * the DSP/BIOS configuration tool under Scheduling --> PRD
> * PRD_load. The period is set there at 10 ticks, which
> each tick
> * corresponding to 1ms in real time.
> */
> void load(void)
> {
> volatile Uint32 i;
>
> if (!DSK6713_DIP_get(1))
> for (i = 0; i < 30000; i++);
> }
Thanks for the response, do you think you could possibly show me an
example of modifying the Rcvbuffers? I'm having trouble modifying them
because of how they were declared I think
(Int16 gBufferRcvPing[BUFFSIZE]).
I get these errors:
"dsk_app.c", line 505: error: expression must have integral type
"dsk_app.c", line 505: error: expression must be a modifiable lvalue

Thanks for your help.
-Fons

--- In c..., Jeff Brower wrote:
>
> Fons-

> You can start by experimenting with code inserted prior to the
copyData() function
> calls. If you "do something" to data in the Rcv buffers prior to
copying them to the
> Xmt buffers, you should hear the results. For example, make the Rcv
buffers all
> zeros, you should get silence. Put in a 1 kHz sine wave, you should
hear a tone. Go
> from there.
>
> Remember, you have to modify both the 'ping' and 'pong' buffers in
order to get
> smooth, continuous output. You should think about that carefully,
for instance if
> you apply a filter then in some cases the filter will "cross" the
buffer boundary and
> your code must deal with that.
>
> -Jeff
>
> PS. When replying, please post to the group, not to me.
Fins,

Do you know the 'C' programing language?

To modify those buffers, which are an array of 16 bit integers,

a typical statement to read a buffer entry would be:
Int16 MyInt; <-- declares a variable of the correct type
MyInt = gBufferRcvPing[5] <-- this gets the 6th entry in the buffer, as buffer offsets begin with 0.

a typical statement to write a buffer entry would be:
gBufferXmtPing[5] = MyInt;

The above makes the reasonable assumption that 'Int16' is a #define or typedef for 'short int'
Do remember that a write to one of these buffers can have a subscript no larger than (BUFFSIZE - 1).
and no less than 0 and must be a whole number (no fractions/decimal points).

R. Williams

---------- Original Message -----------
From: "fins.swiss"
To: c...
Sent: Thu, 13 Dec 2007 15:27:34 -0000
Subject: [c6x] Re: VERY URGENT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! SOMEBODY PLEEASE HELP ME!!!!!!!!!!

> Thanks for the response, do you think you could possibly show me an
> example of modifying the Rcvbuffers? I'm having trouble modifying them
> because of how they were declared I think
> (Int16 gBufferRcvPing[BUFFSIZE]).
> I get these errors:
> "dsk_app.c", line 505: error: expression must have integral type
> "dsk_app.c", line 505: error: expression must be a modifiable lvalue
>
> Thanks for your help.
> -Fons
>
> --- In c..., Jeff Brower wrote:
> >
> > Fons-
>
> > You can start by experimenting with code inserted prior to the
> copyData() function
> > calls. If you "do something" to data in the Rcv buffers prior to
> copying them to the
> > Xmt buffers, you should hear the results. For example, make the Rcv
> buffers all
> > zeros, you should get silence. Put in a 1 kHz sine wave, you should
> hear a tone. Go
> > from there.
> >
> > Remember, you have to modify both the 'ping' and 'pong' buffers in
> order to get
> > smooth, continuous output. You should think about that carefully,
> for instance if
> > you apply a filter then in some cases the filter will "cross" the
> buffer boundary and
> > your code must deal with that.
> >
> > -Jeff
> >
> > PS. When replying, please post to the group, not to me.
------- End of Original Message -------