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

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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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components/esp_driver_rmt/src/rmt_encoder_copy.c
+11 -8
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@@ -20,11 +20,11 @@ static esp_err_t rmt_copy_encoder_reset(rmt_encoder_t *encoder)
}
static size_t rmt_encode_copy(rmt_encoder_t *encoder, rmt_channel_handle_t channel,
const void *primary_data, size_t data_size, rmt_encode_state_t *ret_state)
const void *input_symbols, size_t data_size, rmt_encode_state_t *ret_state)
{
rmt_copy_encoder_t *copy_encoder = __containerof(encoder, rmt_copy_encoder_t, base);
rmt_tx_channel_t *tx_chan = __containerof(channel, rmt_tx_channel_t, base);
rmt_symbol_word_t *symbols = (rmt_symbol_word_t *)primary_data;
rmt_symbol_word_t *symbols = (rmt_symbol_word_t *)input_symbols;
rmt_encode_state_t state = RMT_ENCODING_RESET;
rmt_dma_descriptor_t *desc0 = NULL;
rmt_dma_descriptor_t *desc1 = NULL;
@@ -33,7 +33,8 @@ static size_t rmt_encode_copy(rmt_encoder_t *encoder, rmt_channel_handle_t chann
// how many symbols will be copied by the encoder
size_t mem_want = (data_size / 4 - symbol_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) {
@@ -48,7 +49,7 @@ static size_t rmt_encode_copy(rmt_encoder_t *encoder, rmt_channel_handle_t chann
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];
@@ -57,13 +58,13 @@ static size_t rmt_encode_copy(rmt_encoder_t *encoder, rmt_channel_handle_t chann
size_t len = encode_len;
while (len > 0) {
mem_to_nc[tx_chan->mem_off++] = symbols[symbol_index++];
mem_to_nc[symbol_off++] = symbols[symbol_index++];
len--;
}
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];
@@ -91,12 +92,14 @@ static size_t rmt_encode_copy(rmt_encoder_t *encoder, rmt_channel_handle_t chann
}
// 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;