DMA example

Hi John,

Check out BIOSPSP Software Packages for your device,

http://software-dl.ti.com/dsps/dsps_public_sw/psp/BIOSPSP/02_10_01/index_FDS.html

After installing you will find example project configured with DMA mode, you can change it as per your requirement.

~\biospsp_03_00_01_00\drivers\examples\evm6748\audio

Hi Arvind,

I tried to implement the example 1 (Async) from this link

http://processors.wiki.ti.com/index.php/Programming_the_EDMA3_using_the_Low-Level_Driver_%28LLD%29

I code this in the server as an algorithm where different codecs are able to call.
I set up the link to the 3 .lib in the link.cmd and is able to compile and test.
I manage to create the edma3 instance but is not able to open it. Same with my release method, I am able to delete and not able to close it.
Can you assist to see which part I might be missing out?

void EDMAConfig(EDMA_Object *EdmaObj)
{ 
EDMA3_DRV_Result edma3Result = EDMA3_DRV_SOK;

// set global config to defaults in sample Params (located in bios_edma3_drv_sample_C6455_cfg.c)
EDMA3_DRV_GblConfigParams *globalConfig = &sampleEdma3GblCfgParams; 

// used in DRV_create() function to specify master/slave
EDMA3_DRV_MiscParam miscParam; 

// used for EDMA3_DRV_open() API and initCfg structure, defined in <edma3_drv.h>
EDMA3_DRV_InitConfig initCfg;

// located in bios_edma3_drv_sample_C6455_cfg.c
EDMA3_DRV_InstanceInitConfig *instanceConfig = &sampleInstInitConfig; 

if (EdmaObj->hEdma == NULL)
{
// Declare Config structure used to initialize the Driver Instance (needed by DRV_open)
initCfg.isMaster = TRUE; 
initCfg.regionId = (EDMA3_RM_RegionId)1u; 
initCfg.drvSemHandle = NULL; 
initCfg.drvInstInitConfig = instanceConfig; 
initCfg.gblerrCb = NULL; 
initCfg.gblerrData = NULL; 
miscParam.isSlave = FALSE; 

// EDMA3 Driver Create (called only once for each EDMA3 hardware instance) 
edma3Result = EDMA3_DRV_create(edma3InstanceId, globalConfig, (void *)&miscParam);
if (edma3Result != EDMA3_DRV_SOK)
{ 
// print create failed
}
else
{
//print success

/* Open the Driver Instance */
EdmaObj->hEdma = EDMA3_DRV_open (edma3InstanceId, (void *) &initCfg, &edma3Result);
if(EdmaObj->hEdma == NULL)
{
//print open failed
}
else
{
// print open success
}
}
}
else
{ 
// print exists
}
}

Okay. I figured out that I'm missing an OS Semaphore, so I need to create it and parse in initCfg.drvSemHandle.

I tried running and it is able to create, open, request channel, enable transfer, free channel and clean up properly.

The issue comes when I print out the buffer that I am trying to copy. There is no change in terms of the initial and the final buffer.

Please help.

#define BUFFSIZE 32
int16_t SrcBuf[BUFFSIZE]; // Src of transfer int16_t DstBuf[BUFFSIZE]; // Dst of transfer

void init_buffers(void)
{
	memset(SrcBuf, 0xAD, sizeof(SrcBuf)); // convenient to init Src to a value
	memset(DstBuf, 0, sizeof(DstBuf));
}

void edma_createChan(edma_object_t *EdmaObj, int16_t *Src, int16_t *Dst)
{
//.....
EDMA3_RM_EventQueue eventQ = 0;

EDMA3_RM_TccCallback tccCb = 0;

edma3Result = EDMA3_DRV_requestChannel (EdmaObj->hEdma, &EdmaObj->iChannel, &EdmaObj->iTcc, eventQ, tccCb, NULL);

EDMA3_DRV_setSrcParams (EdmaObj->hEdma, EdmaObj->iChannel, (unsigned int) (Src), EDMA3_DRV_ADDR_MODE_INCR, EDMA3_DRV_W8BIT);

EDMA3_DRV_setDestParams (EdmaObj->hEdma, EdmaObj->iChannel, (unsigned int) (Dst), EDMA3_DRV_ADDR_MODE_INCR, EDMA3_DRV_W8BIT); 

EDMA3_DRV_setSrcIndex(EdmaObj->hEdma, EdmaObj->iChannel, 2, 0); // set SRCBIDX to 2, SRCCIDX to 0 (single AB transfer)

EDMA3_DRV_setDestIndex(EdmaObj->hEdma, EdmaObj->iChannel, 2, 0);// set DSTBIDX to 2, DSTCIDX to 0

EDMA3_DRV_setTransferParams(EdmaObj->hEdma, EdmaObj->iChannel, 2,BUFFSIZE,1,0,EDMA3_DRV_SYNC_AB); //ACNT=2, BCNT=BUFFSIZE, CCNT=1, BCNTRLD=0, SYNC=AB

EDMA3_DRV_setOptField (EdmaObj->hEdma,EdmaObj->iChannel, EDMA3_DRV_OPT_FIELD_TCINTEN, EDMA3_DRV_TCINTEN_EN);
//....
}