C6748 USB DMA Bulk

Hi:

We are using C6748 in our project and have looked at the starterware examples(C6748_StarterWare_1_20_03_03\examples \lcdkC6748\usb_dev_bulk). We use one of the USB controller of the C6748 as a USB bulk device. The cppi DMA mode is to be used by refer to another example (C:\C6748_StarterWare_1_20_03_03\examples\lcdkC6748\usb_dev_msc),but it seems doesn't work very well. I change some codes:

 /*************************************************************************************/

 usbdbulk.c

const tFIFOConfig g_sUSBbulkFIFOConfig = {     //     // IN endpoints.     //     {         { 1, false, USB_EP_DEV_IN | USB_EP_DMA_MODE_1 | USB_EP_AUTO_SET },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN },         { 1, false, USB_EP_DEV_IN }     },

    //     // OUT endpoints.     //     {         { 1, false, USB_EP_DEV_OUT | USB_EP_DMA_MODE_1 | USB_EP_AUTO_CLEAR },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT },         { 1, false, USB_EP_DEV_OUT }     }, };

tDeviceInfo g_sBulkDeviceInfo :

      &g_sUSBDefaultFIFOConfig----->&g_sUSBbulkFIFOConfig

 /****************************************************************************************/

 usb_dev_bulk.c add:

 endpointInfo epInfo[]=  {   {    USB_EP_TO_INDEX(USB_EP_1),    CPDMA_DIR_RX,    CPDMA_MODE_SET_TRANSPARENT,   },      {    USB_EP_TO_INDEX(USB_EP_1),    CPDMA_DIR_TX,    CPDMA_MODE_SET_GRNDIS,   }

 };

 Cppi41DmaInit(USB_INSTANCE, epInfo, NUMBER_OF_ENDPOINTS);

for(;g_bufferIndex < NUM_OF_RX_BDs; g_bufferIndex++)

 {

  dataBuffer = (unsigned char *)cppiDmaAllocBuffer();

 doDmaRxTransfer(USB_INSTANCE, USB_MSC_BUFER_SIZE, dataBuffer, g_sBulkDevice.psPrivateBulkData->ucOUTEndpoint);

}

when I use CPPI DMA to test: it can send the first 20 bytes successfully,and then no data can be send. Can anyone from TI help us to solve this problem?

for(i=0; i<3; i++)

{

 enableCoreTxDMA(USB_INSTANCE, psInst->ucINEndpoint);

 cmdBuffer = (unsigned int)cppiDmaAllocBuffer();  

memcpy((unsigned char*)cmdBuffer, temp_buf, 20);  

doDmaTxTransfer(USB_INSTANCE, (unsigned char*)cmdBuffer, 20, psInst->ucINEndpoint);  

}