EDMA3 pingpong例程

给你一个C64x+上的参考，L138的细节可能还不太一样，不过流程应该是一样的

/* ===========================================================================
* Copyright (c) Texas Instruments Inc 2002, 2003, 2004, 2005
*
* Use of this software is controlled by the terms and conditions found in the
* license agreement under which this software has been supplied.
* ==========================================================================
*/

/** ===========================================================================
*
* @file Edma_ping_pong_xfer_gbl_reg.c
*
* @path $(CSLPATH)\example\edma\edma_ping_pong_xfer_gbl_reg\src
*
* @desc Example of EDMA
*
* ============================================================================
* @n <b> Example Description </b>
* @n This is an example of the CSL EDMA usage for the
* Channel Initialization for ping pong buffer transfer
* where channels are opened in the global region
*
*=============================================================================
*
* <b> Test Procedure </b>
* @verbatim
* 1. Configure the CCS setup to work with the emulator being used
* 2. Please refer CCS manual for setup configuration and loading
* proper GEL file
* 3. Launch CCS window
* 4. Open project Edma_ping_pong_xfer_gbl_reg.pjt
* 5. Build the project and load the .out file of the project.
* 6. The example can be executed from the main().
*
* @endverbatim
*
*
* =============================================================================
*/

/* ============================================================================
* Revision History
* ===============
* 29-May-2004 Ruchika Kharwar File Created.
*
* ============================================================================
*/

#include <stdio.h>
#include <csl_edma3.h>
#include <soc.h>

/* Globals */
Uint8 srcBuff1[256];
Uint8 srcBuff2[256];
Uint8 dstBuff1[256];
Uint8 dstBuff2[256];
Uint32 passStatus = 1;

/* Forward declaration */
void edma_ping_pong_xfer_gbl_region (void);

/*
* =============================================================================
* @func main
*
* @desc
* This is the main routine for the file.
*
* =============================================================================
*/
void main(void)
{

/* Invoke example */
edma_ping_pong_xfer_gbl_region ();

return;
}

/*
* =============================================================================
* @func edma_ping_pong_xfer_gbl_region
*
* @arg
* NONE
*
* @desc
* This is the example routine which perform edma ping pong buffer transfer
* where channel is open in the global region.
*
* @return
* NONE
*
* =============================================================================
*/
void edma_ping_pong_xfer_gbl_region (void)
{
CSL_Edma3Handle hModule;
// CSL_Edma3HwSetup hwSetup;
CSL_Edma3Obj edmaObj;
CSL_Edma3ParamHandle hParamPing;
CSL_Edma3ParamHandle hParamPong;
CSL_Edma3ParamHandle hParamBasic;
CSL_Edma3ChannelObj chObj;
CSL_Edma3CmdIntr regionIntr;
CSL_Edma3ChannelHandle hChannel;
CSL_Edma3ParamSetup myParamSetup;
CSL_Edma3Context context;
CSL_Edma3ChannelAttr chAttr;
CSL_Status status;
// CSL_Edma3HwDmaChannelSetup dmahwSetup;
Uint32 loopIndex;


/* Initialize data */
for (loopIndex = 0; loopIndex < 256; loopIndex++) {
srcBuff1[loopIndex] = loopIndex;
srcBuff2[loopIndex] = loopIndex;
dstBuff1[loopIndex] = 0;
dstBuff2[loopIndex] = 0;
}

/* Module initialization */
status = CSL_edma3Init(&context);
if (status != CSL_SOK) {
printf ("Edma module initialization failed\n");
return;
}

/* Module level open */
hModule = CSL_edma3Open(&edmaObj,CSL_EDMA3,NULL,&status);
if ( (hModule == NULL) || (status != CSL_SOK)) {
printf ("Edma module open failed\n");
return;
}
#if 0
/* Module setup */
dmahwSetup.paramNum = 0;
dmahwSetup.que = CSL_EDMA3_QUE_0;
hwSetup.dmaChaSetup = &dmahwSetup;
hwSetup.qdmaChaSetup = NULL;
status = CSL_edma3HwSetup(hModule,&hwSetup);
if (status != CSL_SOK) {
printf ("Hardware setup failed\n");
CSL_edma3Close (hModule);
return;
}
#endif
/* Channel open */
chAttr.regionNum = CSL_EDMA3_REGION_GLOBAL;
chAttr.chaNum = CSL_EDMA3_CHA_TEVTLO0;
hChannel = CSL_edma3ChannelOpen(&chObj, CSL_EDMA3, &chAttr, &status);
if ((hChannel == NULL) || (status != CSL_SOK)) {
printf ("Edma channel open failed\n");
return;
}

CSL_edma3HwChannelSetupParam(hChannel, CSL_EDMA3_CHA_TEVTLO0);
if (status != CSL_SOK) {
printf ("Edma channel setup param failed\n");
return;
}

/* Change Channel Default queue setup from 0 to 3 */
status = CSL_edma3HwChannelSetupQue(hChannel,CSL_EDMA3_QUE_3);
if (status != CSL_SOK) {
printf ("Edma channel setup que failed\n");
return;
}

/* Obtain a handle to parameter set 0 */
hParamBasic = CSL_edma3GetParamHandle(hChannel,0,NULL);
if (hParamBasic == NULL) {
printf ("Edma get param handle for param entry 0 failed\n");
return;
}

/* Obtain a handle to parameter set 2 */
hParamPing = CSL_edma3GetParamHandle(hChannel,2,NULL);
if (hParamPing == NULL) {
printf ("Edma get param handle for param entry 2 failed\n");
return;
}

/* Obtain a handle to parameter set 1 */
hParamPong = CSL_edma3GetParamHandle(hChannel,1,NULL);
if (hParamPong == NULL) {
printf ("Edma get param handle for param entry 1 failed\n");
return;
}

/* Setup the parameter entry parameters (Ping buffer) */
myParamSetup.option = CSL_EDMA3_OPT_MAKE(CSL_EDMA3_ITCCH_DIS, \
CSL_EDMA3_TCCH_DIS, \
CSL_EDMA3_ITCINT_DIS, \
CSL_EDMA3_TCINT_EN, \
0,CSL_EDMA3_TCC_NORMAL,\
CSL_EDMA3_FIFOWIDTH_NONE, \
CSL_EDMA3_STATIC_DIS, \
CSL_EDMA3_SYNC_A, \
CSL_EDMA3_ADDRMODE_INCR, \
CSL_EDMA3_ADDRMODE_INCR );
myParamSetup.srcAddr = (Uint32)srcBuff1;
myParamSetup.aCntbCnt = CSL_EDMA3_CNT_MAKE(256,1);
myParamSetup.dstAddr = (Uint32)dstBuff1;
myParamSetup.srcDstBidx = CSL_EDMA3_BIDX_MAKE(1,1);
myParamSetup.linkBcntrld = CSL_EDMA3_LINKBCNTRLD_MAKE(hParamPong,0);
myParamSetup.srcDstCidx = CSL_EDMA3_CIDX_MAKE(0,1);
myParamSetup.cCnt = 1;
status = CSL_edma3ParamSetup(hParamBasic,&myParamSetup);
if (status != CSL_SOK) {
printf("Edma parameter entry setup is failed\n");
return;
}

/* Ping setup */
status = CSL_edma3ParamSetup(hParamPing,&myParamSetup);
if (status != CSL_SOK) {
printf("Edma ping parameter entry setup is failed\n");
return;
}

/* Pong setup */
myParamSetup.linkBcntrld = CSL_EDMA3_LINKBCNTRLD_MAKE(hParamPing,0);
myParamSetup.option = CSL_EDMA3_OPT_MAKE(CSL_EDMA3_ITCCH_DIS, \
CSL_EDMA3_TCCH_DIS, \
CSL_EDMA3_ITCINT_DIS, \
CSL_EDMA3_TCINT_EN,\
1,CSL_EDMA3_TCC_NORMAL,\
CSL_EDMA3_FIFOWIDTH_NONE, \
CSL_EDMA3_STATIC_EN, \
CSL_EDMA3_SYNC_A, \
CSL_EDMA3_ADDRMODE_INCR, \
CSL_EDMA3_ADDRMODE_INCR );
myParamSetup.srcAddr = (Uint32)srcBuff2;
myParamSetup.dstAddr = (Uint32)dstBuff2;
status = CSL_edma3ParamSetup(hParamPong,&myParamSetup);
if (status != CSL_SOK) {
printf("Edma ping parameter entry setup is failed\n");
return;
}

/* Interrupt enable (Bits 0-1) for the global region interrupts */
regionIntr.region = CSL_EDMA3_REGION_GLOBAL ;
regionIntr.intr = 0x3 ;
regionIntr.intrh = 0x0000 ;
CSL_edma3HwControl(hModule,CSL_EDMA3_CMD_INTR_ENABLE,&regionIntr);

/* Trigger channel */
CSL_edma3HwChannelControl(hChannel,CSL_EDMA3_CMD_CHANNEL_SET,NULL);
regionIntr.region = CSL_EDMA3_REGION_GLOBAL ;
regionIntr.intr = 0 ;
regionIntr.intrh = 0 ;

/* Poll on IPR bit 0 */
do {
CSL_edma3GetHwStatus(hModule,CSL_EDMA3_QUERY_INTRPEND,&regionIntr);
} while (!(regionIntr.intr & 0x1));

/* Clear the pending bit */
CSL_edma3HwControl(hModule,CSL_EDMA3_CMD_INTRPEND_CLEAR,&regionIntr);

/* Trigger Channel */
CSL_edma3HwChannelControl(hChannel,CSL_EDMA3_CMD_CHANNEL_SET,NULL);

/* Poll on IPR bit 2 */
do {
CSL_edma3GetHwStatus(hModule,CSL_EDMA3_QUERY_INTRPEND,&regionIntr);
} while (!(regionIntr.intr & 0x2));

/* Check transfer by comparing the source and destination buffers */
if(Verify_Transfer( 256, 1, 1, 0, 0, 0, 0, srcBuff1, dstBuff1, \
TRUE) == FALSE)
passStatus = 0;

if(Verify_Transfer( 256, 1, 1, 0, 0, 0, 0, srcBuff2, dstBuff2, \
TRUE) == FALSE)
passStatus = 0;

if (passStatus == 1)
printf ("<<EXAMPLE PASSED>>: Edma Ping Pong Buffer Transfer Passed\n");
else {
printf ("<<EXAMPLE FAILED>>: Edma Ping Pong Buffer Transfer Failed\n");
return;
}

/* Close channel */
status = CSL_edma3ChannelClose(hChannel);
if (status != CSL_SOK) {
printf("Edma channel close failed\n");
return;
}

/* Close edma module */
status = CSL_edma3Close(hModule);
if (status != CSL_SOK) {
printf("Edma module close failed\n");
return;
}

printf ("=============================================================\n");

return;
}

csl下的例子