执行CSL_edma3Open()函数的问题

ZhengTian Wang

执行CSL_edma3Open()函数后hModule是空，导致无法EDMA功能。不知道为什么出现这个问题？
CSL_EDMA3的值是1。

void EDMAInit()
{
    CSL_Edma3ChannelAttr     chParam;
    CSL_Edma3Context         edmaContext;
    CSL_Edma3QueryInfo       info;
    CSL_Edma3CmdIntr         regionIntr;
    CSL_Edma3CmdDrae         regionAccess;
    CSL_Status               status;

/* Edma Module Initialization */
CSL_edma3Init(&edmaContext); //初始化edma上下文对象变量，返回状态CSL_SOK

/* Edma Module Level Open, 得到EDMA寄存器组的首地址,赋给edmaObj->regs,最后返回的指针hModule实际上指向edmaObj*/
hModule = CSL_edma3Open(&edmaObj,CSL_EDMA3,NULL,&status);

/* Query Module Info ,得到EDMA控制器的状态,实际上就是把PID和CCCFG寄存器的值读出到info*/
CSL_edma3GetHwStatus(hModule,CSL_EDMA3_QUERY_INFO, &info);
......
}

12 年多前

0 noaming 12 年多前

Guru 52751 points

你测试到CSL_edma3Init(&edmaContext); 返回值是什么？对于这个函数的参数，文档中说明是：

pContext    Pointer to module-context. As EDMA doesn't have
                        any context based information user is expected 
                        to pass NULL

0 ZhengTian Wang 12 年多前回复 noaming

Intellectual 902 points

问题已解决，将CSL_EDMA的值设为2就可以了，其他数值就不行，原因是什么？

0 James Li2 12 年多前回复 ZhengTian Wang

TI__Intellectual 1385 points

可以把CSL的source code加到你的工程里debug一下。例如下面是CSL_edma3Open的函数体，有多处条件判断都可能导致返回NULL。

CSL_Edma3Handle CSL_edma3Open
(
CSL_Edma3Obj* pEdmaObj,
CSL_InstNum edmaNum,
CSL_Edma3ModuleAttr* pAttr,
CSL_Status* pStatus
)
{
CSL_Edma3ModuleBaseAddress baseAddress;
CSL_Edma3CfgInfo cfgInfo;
CSL_Edma3Handle hEdma = (CSL_Edma3Handle)NULL;

/* Parameter Validation: Ensure that there is a placeholder to hold the status of the API */
if (pStatus == NULL)
return NULL;

/* Parameter Validation: Ensure that there a valid parameter EDMA object is passed. */
if (pEdmaObj == NULL)
{
*pStatus = CSL_ESYS_INVPARAMS;
return NULL;
}

/* Get the EDMA Base Address. */
*pStatus = CSL_edma3ccGetModuleBaseAddr(edmaNum, pAttr, &baseAddress, &cfgInfo);
if (*pStatus == CSL_SOK)
{
/* Success: Initialize the parameters here. */
pEdmaObj->regs = baseAddress.regs;
pEdmaObj->instNum = (CSL_InstNum)edmaNum;
pEdmaObj->cfgInfo = cfgInfo;

/* Return the handle */
hEdma = (CSL_Edma3Handle)pEdmaObj;
}
else
{
/* Error: Failed to get the base address for the Instance; report failure. */
pEdmaObj->regs = (CSL_Edma3ccRegsOvly)NULL;
pEdmaObj->instNum = (CSL_InstNum) -1;
}
return (hEdma);
}

0 ZhengTian Wang 12 年多前回复 James Li2

Intellectual 902 points

之前不行是因为执行到

*pStatus = CSL_edma3ccGetModuleBaseAddr(edmaNum, pAttr, &baseAddress, &cfgInfo);

时*pStatus不等于CSL_SOK。

处理器

处理器论坛

执行CSL_edma3Open()函数的问题