/**
* \brief Start DMAC Multiple Buffer Transfer.
*/
static uint8_t _start_dma_transfer(void)
{
uint32_t i;
/* Prepare source data to be transfered. */
for (i = 0 ; i < BUFFER_LEN ; i++) {
src_buf[i] = i;
dest_buf[i] = 0xFF;
}
printf("-I- The Source Buffer content before transfer\n\r");
_dump_buffer(src_buf);
/* Start transfer */
transfer_complete = false;
cache_clean_region(src_buf, BUFFER_LEN);
cache_clean_region(dest_buf, BUFFER_LEN);
xdmad_start_transfer(xdmad_channel);
/* Wait for completion */
while (!transfer_complete) {
/* always call xdmad_poll, it will do nothing if polling mode
* is disabled */
xdmad_poll();
}
printf("-I- The Destination Buffer content after transfer\n\r");
cache_invalidate_region(dest_buf, BUFFER_LEN);
_dump_buffer(dest_buf);
return 0;
}
/**
* \brief Play demonstration audio music with DMA.
*/
static void _playback_with_dma(uint8_t attn)
{
uint32_t* audio = (uint32_t*)(music_data + sizeof(struct _wav_header));
uint32_t audio_length = ((struct _wav_header*)music_data)->subchunk2_size;
volatile bool done = false;
_playback_start();
_setup_dma_transfer(audio, audio_length);
xdmad_set_callback(dma_channel, _dma_callback, (void *)&done);
xdmad_start_transfer(dma_channel);
while (!done);
_playback_stop();
}