pioduino/esp-idf
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source
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
Download Patch File Download Diff File Expand all files Collapse all files
components/esp_driver_rmt/src/rmt_encoder_simple.c
+12 -9
View File
@@ -37,6 +37,7 @@ static size_t rmt_encode_simple(rmt_encoder_t *encoder, rmt_channel_handle_t cha
rmt_encode_state_t state = RMT_ENCODING_RESET;
rmt_dma_descriptor_t *desc0 = NULL;
rmt_dma_descriptor_t *desc1 = NULL;
size_t symbol_off = tx_chan->mem_off_bytes / sizeof(rmt_symbol_word_t);
// where to put the encoded symbols? DMA buffer or RMT HW memory
rmt_symbol_word_t *mem_to_nc = NULL;
@@ -48,7 +49,7 @@ static size_t rmt_encode_simple(rmt_encoder_t *encoder, rmt_channel_handle_t cha
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];
@@ -69,11 +70,11 @@ static size_t rmt_encode_simple(rmt_encoder_t *encoder, rmt_channel_handle_t cha
// when then called with a larger buffer.
size_t encode_len = 0; //total amount of symbols written to rmt memory
bool is_done = false;
while (tx_chan->mem_off < tx_chan->mem_end) {
while (symbol_off < tx_chan->mem_end) {
if (simple_encoder->ovf_buf_parsed_pos < simple_encoder->ovf_buf_fill_len) {
// Overflow buffer has data from the previous encoding call. Copy one entry
// from that.
mem_to_nc[tx_chan->mem_off++] = simple_encoder->ovf_buf[simple_encoder->ovf_buf_parsed_pos++];
mem_to_nc[symbol_off++] = simple_encoder->ovf_buf[simple_encoder->ovf_buf_parsed_pos++];
encode_len++;
} else {
// Overflow buffer is empty, so we don't need to empty that first.
@@ -87,11 +88,11 @@ static size_t rmt_encode_simple(rmt_encoder_t *encoder, rmt_channel_handle_t cha
// Try to have the callback write the data directly into RMT memory.
size_t enc_size = simple_encoder->callback(data, data_size,
simple_encoder->last_symbol_index,
tx_chan->mem_end - tx_chan->mem_off,
&mem_to_nc[tx_chan->mem_off],
tx_chan->mem_end - symbol_off,
&mem_to_nc[symbol_off],
&is_done, simple_encoder->arg);
encode_len += enc_size;
tx_chan->mem_off += enc_size;
symbol_off += enc_size;
simple_encoder->last_symbol_index += enc_size;
if (is_done) {
break; // we're done, no more data to write to RMT memory.
@@ -130,7 +131,7 @@ static size_t rmt_encode_simple(rmt_encoder_t *encoder, rmt_channel_handle_t cha
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];
@@ -153,12 +154,14 @@ static size_t rmt_encode_simple(rmt_encoder_t *encoder, rmt_channel_handle_t cha
}
// 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;