void DMAInit(void)
{
DMA_disableTransferDuringReadModifyWrite();
DMA_initParam initParam = {0};
initParam.channelSelect = DMA_CHANNEL_0;
initParam.transferModeSelect = DMA_TRANSFER_REPEATED_BLOCK;
initParam.transferSize = 3;
initParam.triggerSourceSelect = DMA_TRIGGERSOURCE_24;
initParam.transferUnitSelect = DMA_SIZE_SRCWORD_DSTWORD;
initParam.triggerTypeSelect = DMA_TRIGGER_RISINGEDGE;
DMA_init(&initParam);
DMA_setSrcAddress(DMA_CHANNEL_0,
ADC12_A_getMemoryAddressForDMA(ADC12_A_BASE,
ADC12_A_MEMORY_0),
DMA_DIRECTION_INCREMENT);
DMA_setDstAddress(DMA_CHANNEL_0,
(uint32_t)&DMA_DST,
DMA_DIRECTION_INCREMENT);
//Enable DMA channel 0 interrupt
DMA_clearInterrupt(DMA_CHANNEL_0);
DMA_enableInterrupt(DMA_CHANNEL_0);
//Enable transfers on DMA channel 0
DMA_enableTransfers(DMA_CHANNEL_0);
}
void * memcpyDMA (void * dest, const void * source, size_t count)
{
if (count == 0){ //do nothing if zero bytes to transfer
return (dest);
}
//DMA4 workaround - disable DMA transfers during read-modify-write CPU
//operations
#ifndef DRIVERLIB_LEGACY_MODE
DMA_disableTransferDuringReadModifyWrite();
DMA_setSrcAddress(USB_DMA_CHAN, (uint32_t)source, DMA_DIRECTION_INCREMENT);
DMA_setDstAddress(USB_DMA_CHAN, (uint32_t)dest, DMA_DIRECTION_INCREMENT);
//DMA4 workaround - re-enable DMA transfers during read-modify-write CPU
//operations
DMA_enableTransferDuringReadModifyWrite();
DMA_setTransferSize(USB_DMA_CHAN, count);
DMA_enableTransfers(USB_DMA_CHAN);
DMA_startTransfer(USB_DMA_CHAN);
while (DMA_getInterruptStatus(USB_DMA_CHAN) == DMA_INT_INACTIVE);
DMA_disableTransfers(USB_DMA_CHAN);
#else
DMA_disableTransferDuringReadModifyWrite(DMA_BASE);
DMA_setSrcAddress(DMA_BASE, USB_DMA_CHAN, (uint32_t)source, DMA_DIRECTION_INCREMENT);
DMA_setDstAddress(DMA_BASE, USB_DMA_CHAN, (uint32_t)dest, DMA_DIRECTION_INCREMENT);
//DMA4 workaround - re-enable DMA transfers during read-modify-write CPU
//operations
DMA_enableTransferDuringReadModifyWrite(DMA_BASE);
DMA_setTransferSize(DMA_BASE, USB_DMA_CHAN, count);
DMA_enableTransfers(DMA_BASE, USB_DMA_CHAN);
DMA_startTransfer(DMA_BASE, USB_DMA_CHAN);
while (DMA_getInterruptStatus(DMA_BASE, USB_DMA_CHAN) == DMA_INT_INACTIVE);
DMA_disableTransfers(DMA_BASE, USB_DMA_CHAN);
#endif
return (dest);
}
