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feat(rmt): allow the encoder to emit the EOF marker

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This commit is contained in:
morris
2025-03-20 18:19:33 +08:00
parent 4f3e64331b
commit a06dfd5f19
6 changed files with 69 additions and 51 deletions
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17
components/esp_driver_rmt/src/rmt_encoder_bytes.c
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@@ -42,7 +42,8 @@ static size_t rmt_encode_bytes(rmt_encoder_t *encoder, rmt_channel_handle_t chan
// how many symbols will be generated by the encoder
size_t mem_want = (data_size - byte_index - 1) * 8 + (8 - bit_index);
// how many symbols we can save for this round
size_t mem_have = tx_chan->mem_end - tx_chan->mem_off;
size_t symbol_off = tx_chan->mem_off_bytes / sizeof(rmt_symbol_word_t);
size_t mem_have = tx_chan->mem_end - symbol_off;
// where to put the encoded symbols? DMA buffer or RMT HW memory
rmt_symbol_word_t *mem_to_nc = NULL;
if (channel->dma_chan) {
@@ -57,7 +58,7 @@ static size_t rmt_encode_bytes(rmt_encoder_t *encoder, rmt_channel_handle_t chan
if (channel->dma_chan) {
// mark the start descriptor
if (tx_chan->mem_off < tx_chan->ping_pong_symbols) {
if (symbol_off < tx_chan->ping_pong_symbols) {
desc0 = &tx_chan->dma_nodes_nc[0];
} else {
desc0 = &tx_chan->dma_nodes_nc[1];
@@ -74,9 +75,9 @@ static size_t rmt_encode_bytes(rmt_encoder_t *encoder, rmt_channel_handle_t chan
}
while ((len > 0) && (bit_index < 8)) {
if (cur_byte & (1 << bit_index)) {
mem_to_nc[tx_chan->mem_off++] = bytes_encoder->bit1;
mem_to_nc[symbol_off++] = bytes_encoder->bit1;
} else {
mem_to_nc[tx_chan->mem_off++] = bytes_encoder->bit0;
mem_to_nc[symbol_off++] = bytes_encoder->bit0;
}
len--;
bit_index++;
@@ -89,7 +90,7 @@ static size_t rmt_encode_bytes(rmt_encoder_t *encoder, rmt_channel_handle_t chan
if (channel->dma_chan) {
// mark the end descriptor
if (tx_chan->mem_off < tx_chan->ping_pong_symbols) {
if (symbol_off < tx_chan->ping_pong_symbols) {
desc1 = &tx_chan->dma_nodes_nc[0];
} else {
desc1 = &tx_chan->dma_nodes_nc[1];
@@ -119,12 +120,14 @@ static size_t rmt_encode_bytes(rmt_encoder_t *encoder, rmt_channel_handle_t chan
}
// reset offset pointer when exceeds maximum range
if (tx_chan->mem_off >= tx_chan->ping_pong_symbols * 2) {
if (symbol_off >= tx_chan->ping_pong_symbols * 2) {
if (channel->dma_chan) {
desc1->dw0.length = tx_chan->ping_pong_symbols * sizeof(rmt_symbol_word_t);
desc1->dw0.owner = DMA_DESCRIPTOR_BUFFER_OWNER_DMA;
}
tx_chan->mem_off = 0;
tx_chan->mem_off_bytes = 0;
} else {
tx_chan->mem_off_bytes = symbol_off * sizeof(rmt_symbol_word_t);
}
*ret_state = state;