Dear experts,
I am working with DSP DM6437. The development environment included CCS 3.3, pspdrivers_1_10_03, edma3_lld_1_06_00_01, bios_5_31_02 ...
My project contains 1 idle task (main), and 3 others. 1 of 3 do the main video intelligent processing (VIP) and 2 remained threads used for SPI read / write functions. All of tasks was started correctly but whenever VIP process step into it's loop with some calculation function, the others Read/Write task was paused (freezed). Whenever the VIP was ended (escape the loop), Read/Write task work again normally. I guess the problem come from the CPU cannot schedule the task correctly to make them work in parallel. Below is my task creation and brief of VIP task.
tskAttrs.priority = 1;
tskAttrs.stacksize = 4096;
tskReader = TSK_create ((Fxn)reader, &tskAttrs, spiInHndl);
if (tskReader == NULL)
{
SYS_abort("spi reader task creation failed!\n");
}
LOG_printf(&trace, "spi reader created.\n");
tskAttrs.priority = 2;
tskAttrs.stacksize = 4096;
tskWriter = TSK_create ((Fxn)writer, &tskAttrs, spiOutHndl);
if (tskWriter == NULL)
{
SYS_abort("spi writer task creation failed!\n");
}
tskAttrs.stacksize = 16*1024;
tskAttrs.priority = 2;
if(NULL == (TSK_create((Fxn)mainAIProcess, &tskAttrs, NULL)))
{
printf("Error: Can't create the AI processing\n");
}
void mainAIProcess ()
{
...
while (1)
{
...
iStatus = videoCaptureGetFrame (InParams.CcdcHandle, &InBuffers);
if (0 != iStatus)
{
printf ("%s: Captured failed, error code : %d\r\n", __FUNCTION__, iStatus);
goto cleanup;
}
VnSUti8BitDownScaleFromYUV422I((unsigned char*)InBuffers.SwapBuffer->frame.frameBufferPtr, iWidth, iHeight, pUcVCAGrayImage, iVCADownRatio, iVCAWidth);
...
}
}
the function VnSUti8BitDownScaleFromYUV422I just extract the Y element from frame and put into another scaled image. I am sure all of the function was tested for the logic and programming errors.
void VnSUti8BitDownScaleFromYUV422I(unsigned char* iPUcOldImage, int iIOldWidth, int iIOldHeight, unsigned char* oPUcNewImage, int iIRatio, int iINewWidth)
{
int x, y;
int iMatchPos;
unsigned char* iPUcTmpOldImage = iPUcOldImage + 1;
for(y = 0; y < iIOldHeight; y++)
{
for(x = 0; x < iIOldWidth; x++, iPUcTmpOldImage = iPUcTmpOldImage + 2)
{
iMatchPos = ((int)(y / iIRatio) * iINewWidth) + (int)(x / iIRatio);
*(oPUcNewImage + iMatchPos) = *iPUcTmpOldImage;
}
}
}
Please give me a hand to step over this problem. I am a newbie with this this field.
Thank you very much!
p/s: if i comment the VnSUti8BitDownScaleFromYUV422I, all things worked correctly. again I am sure that VnSUti8BitDownScaleFromYUV422I have no problem itself.
