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Merge pull request #2552 from jepler/samd-stereo-single-dma 

samd: When possible, use one DMA channel for stereo AudioOut
This commit is contained in:
Scott Shawcroft 2020-01-27 14:15:26 -08:00 committed by GitHub
parent b36b2493bc c8f969feb5
commit eb0ef3726f
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 17 additions and 10 deletions
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4
ports/atmel-samd/audio_dma.c
View File

@ -203,13 +203,13 @@ audio_dma_result audio_dma_setup_playback(audio_dma_t* dma,
if (output_signed != samples_signed) {
output_spacing = 1;
max_buffer_length /= dma->spacing;
dma->first_buffer = (uint8_t*) m_malloc(max_buffer_length, false);
dma->first_buffer = (uint8_t*) m_realloc(dma->first_buffer, max_buffer_length);
if (dma->first_buffer == NULL) {
return AUDIO_DMA_MEMORY_ERROR;
}
dma->first_buffer_free = true;
if (!single_buffer) {
dma->second_buffer = (uint8_t*) m_malloc(max_buffer_length, false);
dma->second_buffer = (uint8_t*) m_realloc(dma->second_buffer, max_buffer_length);
if (dma->second_buffer == NULL) {
return AUDIO_DMA_MEMORY_ERROR;
}

23
ports/atmel-samd/common-hal/audioio/AudioOut.c
View File

@ -397,15 +397,22 @@ void common_hal_audioio_audioout_play(audioio_audioout_obj_t* self,
if (self->right_channel == &pin_PA02) {
right_channel_reg = (uint32_t) &DAC->DATABUF[0].reg;
}
result = audio_dma_setup_playback(&self->left_dma, sample, loop, true, 0,
false /* output unsigned */,
left_channel_reg,
left_channel_trigger);
if (right_channel_reg != 0 && result == AUDIO_DMA_OK) {
result = audio_dma_setup_playback(&self->right_dma, sample, loop, true, 1,
if(right_channel_reg == left_channel_reg + 2 && audiosample_bits_per_sample(sample) == 16) {
result = audio_dma_setup_playback(&self->left_dma, sample, loop, false, 0,
false /* output unsigned */,
right_channel_reg,
right_channel_trigger);
left_channel_reg,
left_channel_trigger);
} else {
result = audio_dma_setup_playback(&self->left_dma, sample, loop, true, 0,
false /* output unsigned */,
left_channel_reg,
left_channel_trigger);
if (right_channel_reg != 0 && result == AUDIO_DMA_OK) {
result = audio_dma_setup_playback(&self->right_dma, sample, loop, true, 1,
false /* output unsigned */,
right_channel_reg,
right_channel_trigger);
}
}
#endif
if (result != AUDIO_DMA_OK) {