//*****************************************************************************
//
//! Stop the DMA transfer
//!
//! \param None
//!
//! This function
//! 1. Stops the uDMA transfer on specified channel
//!
//! \return None.
//
//*****************************************************************************
void UDMAStopTransfer(unsigned long ulChannel)
{
//
// Disable the channel
//
MAP_uDMAChannelDisable(ulChannel);
}
//*****************************************************************************
//
// USBLibDMAChannelDisable() for USB controllers that use uDMA.
//
//*****************************************************************************
static void
uDMAUSBChannelDisable(tUSBDMAInstance *psUSBDMAInst, uint32_t ui32Channel)
{
//
// Disable DMA for the endpoint.
//
if(UDMAConfigIsRx(psUSBDMAInst->pui32Config[ui32Channel - 1]))
{
MAP_USBEndpointDMADisable(psUSBDMAInst->ui32Base,
psUSBDMAInst->pui8Endpoint[ui32Channel - 1],
USB_EP_DEV_OUT);
}
else
{
MAP_USBEndpointDMADisable(psUSBDMAInst->ui32Base,
psUSBDMAInst->pui8Endpoint[ui32Channel - 1],
USB_EP_DEV_IN);
}
//
// Disable the DMA channel in the uDMA controller.
//
MAP_uDMAChannelDisable(ui32Channel - 1);
//
// Clear out any pending or complete flag set for this DMA channel.
//
psUSBDMAInst->ui32Pending &= ~(1 << (ui32Channel - 1));
psUSBDMAInst->ui32Complete &= ~(1 << (ui32Channel - 1));
}
/*
* ======== CameraCC3200DMA_hwiIntFxn ========
* Hwi function that processes Camera interrupts.
*
* The Frame end,DMA interrupts is enabled for the camera.
* The DMA interrupt is triggered for every 64 elements.
* The ISR will check for Frame end interrupt to trigger the callback
* in the non-blocking mode/post a semaphore in the blocking mode to
* indicate capture complete.
*
* @param(arg) The Camera_Handle for this Hwi.
*/
static void CameraCC3200DMA_hwiIntFxn(uintptr_t arg)
{
uint32_t status;
CameraCC3200DMA_Object *object = ((Camera_Handle)arg)->object;
CameraCC3200DMA_HWAttrs const *hwAttrs = ((Camera_Handle)arg)->hwAttrs;
unsigned long **bufferPtr = (unsigned long**)&object->captureBuf;
status = MAP_CameraIntStatus(hwAttrs->baseAddr);
if ((object->cameraDMAxIntrRcvd > 1) && (status & (CAM_INT_FE))) {
DebugP_log2("Camera:(%p) Interrupt with mask 0x%x",
hwAttrs->baseAddr,status);
MAP_CameraIntClear(hwAttrs->baseAddr, CAM_INT_FE);
object->captureCallback((Camera_Handle)arg, *bufferPtr,
object->frameLength);
DebugP_log2("Camera:(%p) capture finished, %d bytes written",
hwAttrs->baseAddr, object->frameLength);
object->inUse = 0;
MAP_CameraCaptureStop(hwAttrs->baseAddr, true);
Power_releaseConstraint(PowerCC3200_DISALLOW_DEEPSLEEP);
}
if (status & CAM_INT_DMA) {
// Camera DMA Done clear
MAP_CameraIntClear(hwAttrs->baseAddr, CAM_INT_DMA);
object->cameraDMAxIntrRcvd++;
object->frameLength +=
(CameraCC3200DMA_DMA_TRANSFER_SIZE*sizeof(unsigned long));
if (object->frameLength < object->bufferlength) {
if (object->cameraDMA_PingPongMode == 0) {
MAP_uDMAChannelControlSet(hwAttrs->channelIndex,
UDMA_SIZE_32 | UDMA_SRC_INC_32 | UDMA_DST_INC_32 | UDMA_ARB_8);
MAP_uDMAChannelAttributeEnable(hwAttrs->channelIndex,
UDMA_ATTR_USEBURST);
MAP_uDMAChannelTransferSet(hwAttrs->channelIndex,
UDMA_MODE_PINGPONG,
(void *)CAM_BUFFER_ADDR,
(void *)*bufferPtr,
CameraCC3200DMA_DMA_TRANSFER_SIZE);
MAP_uDMAChannelEnable(hwAttrs->channelIndex);
*bufferPtr += CameraCC3200DMA_DMA_TRANSFER_SIZE;
object->cameraDMA_PingPongMode = 1;
}
else {
MAP_uDMAChannelControlSet(hwAttrs->channelIndex | UDMA_ALT_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_32 | UDMA_DST_INC_32 | UDMA_ARB_8);
MAP_uDMAChannelAttributeEnable(
hwAttrs->channelIndex | UDMA_ALT_SELECT,
UDMA_ATTR_USEBURST);
MAP_uDMAChannelTransferSet(
hwAttrs->channelIndex | UDMA_ALT_SELECT,
UDMA_MODE_PINGPONG,
(void *)CAM_BUFFER_ADDR, (void *)*bufferPtr,
CameraCC3200DMA_DMA_TRANSFER_SIZE);
MAP_uDMAChannelEnable(hwAttrs->channelIndex | UDMA_ALT_SELECT);
*bufferPtr += CameraCC3200DMA_DMA_TRANSFER_SIZE;
object->cameraDMA_PingPongMode = 0;
}
}
else {
// Disable DMA
MAP_UtilsDelay(20000);
MAP_uDMAChannelDisable(hwAttrs->channelIndex);
MAP_CameraIntDisable(hwAttrs->baseAddr, CAM_INT_DMA);
object->cameraDMA_PingPongMode = 0;
object->captureCallback((Camera_Handle)arg, *bufferPtr,
object->frameLength);
DebugP_log2("Camera:(%p) capture finished, %d bytes written",
hwAttrs->baseAddr, object->frameLength);
MAP_CameraCaptureStop(hwAttrs->baseAddr, true);
Power_releaseConstraint(PowerCC3200_DISALLOW_DEEPSLEEP);
}
}
}
