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Added Audio Out to Soundboard app (#1748)

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Mark Thompson 2024-01-09 13:50:45 -06:00 • committed by GitHub
parent 0e6f303eec
commit 485f57d86b
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6 changed files with 38 additions and 7 deletions
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15
firmware/baseband/audio_dma.cpp
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@ -123,10 +123,10 @@ constexpr gpdma::channel::Config config_rx() {
/* TODO: Clean up terminology around "buffer", "transfer", "samples" */
constexpr size_t buffer_samples_log2n = 7;
constexpr size_t buffer_samples = (1 << buffer_samples_log2n);
constexpr size_t buffer_samples = (1 << buffer_samples_log2n); // 2^7 = 128 byte circular DMA buffer
constexpr size_t transfers_per_buffer_log2n = 2;
constexpr size_t transfers_per_buffer = (1 << transfers_per_buffer_log2n);
constexpr size_t transfer_samples = buffer_samples / transfers_per_buffer;
constexpr size_t transfers_per_buffer = (1 << transfers_per_buffer_log2n); // 2^2 = 4 transfer buffers in the circular buffer
constexpr size_t transfer_samples = buffer_samples / transfers_per_buffer; // 128/4 = 32 samples in each transfer buffer
constexpr size_t transfers_mask = transfers_per_buffer - 1;
constexpr size_t buffer_bytes = buffer_samples * sizeof(sample_t);
@ -144,6 +144,8 @@ static constexpr auto& gpdma_channel_i2s0_rx = gpdma::channels[portapack::i2s0_r
static volatile const gpdma::channel::LLI* tx_next_lli = nullptr;
static volatile const gpdma::channel::LLI* rx_next_lli = nullptr;
static bool single_tx_buffer = false;
static void tx_transfer_complete() {
tx_next_lli = gpdma_channel_i2s0_tx.next_lli();
}
@ -213,11 +215,16 @@ void disable() {
gpdma_channel_i2s0_rx.disable();
}
void shrink_tx_buffer() {
single_tx_buffer = true;
lli_tx_loop[0].lli = lli_pointer(&lli_tx_loop[0]);
}
buffer_t tx_empty_buffer() {
const auto next_lli = tx_next_lli;
if (next_lli) {
const size_t next_index = next_lli - &lli_tx_loop[0];
const size_t free_index = (next_index + transfers_per_buffer - 2) & transfers_mask;
const size_t free_index = (single_tx_buffer) ? 0 : (next_index + transfers_per_buffer - 2) & transfers_mask;
return {reinterpret_cast<sample_t*>(lli_tx_loop[free_index].srcaddr), transfer_samples};
} else {
return {nullptr, 0};