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esp-idf/components/driver/rmt/rmt_tx.c

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/*
* SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <string.h>
#include <sys/cdefs.h>
#include <sys/param.h>
#include "sdkconfig.h"
#if CONFIG_RMT_ENABLE_DEBUG_LOG
// The local log level must be defined before including esp_log.h
// Set the maximum log level for this source file
#define LOG_LOCAL_LEVEL ESP_LOG_DEBUG
#endif
#include "esp_log.h"
#include "esp_check.h"
#include "esp_rom_gpio.h"
#include "soc/rmt_periph.h"
#include "soc/rtc.h"
#include "hal/rmt_ll.h"
#include "hal/gpio_hal.h"
#include "driver/gpio.h"
#include "driver/rmt_tx.h"
#include "rmt_private.h"
#include "esp_memory_utils.h"
static const char *TAG = "rmt";
struct rmt_sync_manager_t {
rmt_group_t *group; // which group the synchro belongs to
uint32_t channel_mask; // Mask of channels that are managed
size_t array_size; // Size of the `tx_channel_array`
rmt_channel_handle_t tx_channel_array[]; // Array of TX channels that are managed
};
static esp_err_t rmt_del_tx_channel(rmt_channel_handle_t channel);
static esp_err_t rmt_tx_modulate_carrier(rmt_channel_handle_t channel, const rmt_carrier_config_t *config);
static esp_err_t rmt_tx_enable(rmt_channel_handle_t channel);
static esp_err_t rmt_tx_disable(rmt_channel_handle_t channel);
static void rmt_tx_default_isr(void *args);
static void rmt_tx_do_transaction(rmt_tx_channel_t *tx_chan, rmt_tx_trans_desc_t *t);
#if SOC_RMT_SUPPORT_DMA
static bool rmt_dma_tx_eof_cb(gdma_channel_handle_t dma_chan, gdma_event_data_t *event_data, void *user_data);
static esp_err_t rmt_tx_init_dma_link(rmt_tx_channel_t *tx_channel, const rmt_tx_channel_config_t *config)
{
rmt_symbol_word_t *dma_mem_base = heap_caps_calloc(1, sizeof(rmt_symbol_word_t) * config->mem_block_symbols, RMT_MEM_ALLOC_CAPS | MALLOC_CAP_DMA);
ESP_RETURN_ON_FALSE(dma_mem_base, ESP_ERR_NO_MEM, TAG, "no mem for tx DMA buffer");
tx_channel->base.dma_mem_base = dma_mem_base;
for (int i = 0; i < RMT_DMA_NODES_PING_PONG; i++) {
// each descriptor shares half of the DMA buffer
tx_channel->dma_nodes[i].buffer = dma_mem_base + tx_channel->ping_pong_symbols * i;
tx_channel->dma_nodes[i].dw0.size = tx_channel->ping_pong_symbols * sizeof(rmt_symbol_word_t);
// the ownership will be switched to DMA in `rmt_tx_do_transaction()`
tx_channel->dma_nodes[i].dw0.owner = DMA_DESCRIPTOR_BUFFER_OWNER_CPU;
// each node can generate the DMA eof interrupt, and the driver will do a ping-pong trick in the eof callback
tx_channel->dma_nodes[i].dw0.suc_eof = 1;
}
gdma_channel_alloc_config_t dma_chan_config = {
.direction = GDMA_CHANNEL_DIRECTION_TX,
};
ESP_RETURN_ON_ERROR(gdma_new_channel(&dma_chan_config, &tx_channel->base.dma_chan), TAG, "allocate TX DMA channel failed");
gdma_strategy_config_t gdma_strategy_conf = {
.auto_update_desc = true,
.owner_check = true,
};
gdma_apply_strategy(tx_channel->base.dma_chan, &gdma_strategy_conf);
gdma_tx_event_callbacks_t cbs = {
.on_trans_eof = rmt_dma_tx_eof_cb,
};
gdma_register_tx_event_callbacks(tx_channel->base.dma_chan, &cbs, tx_channel);
return ESP_OK;
}
#endif // SOC_RMT_SUPPORT_DMA
static esp_err_t rmt_tx_register_to_group(rmt_tx_channel_t *tx_channel, const rmt_tx_channel_config_t *config)
{
size_t mem_block_num = 0;
// start to search for a free channel
// a channel can take up its neighbour's memory block, so the neighbour channel won't work, we should skip these "invaded" ones
int channel_scan_start = RMT_TX_CHANNEL_OFFSET_IN_GROUP;
int channel_scan_end = RMT_TX_CHANNEL_OFFSET_IN_GROUP + SOC_RMT_TX_CANDIDATES_PER_GROUP;
if (config->flags.with_dma) {
// for DMA mode, the memory block number is always 1; for non-DMA mode, memory block number is configured by user
mem_block_num = 1;
// Only the last channel has the DMA capability
channel_scan_start = RMT_TX_CHANNEL_OFFSET_IN_GROUP + SOC_RMT_TX_CANDIDATES_PER_GROUP - 1;
tx_channel->ping_pong_symbols = config->mem_block_symbols / 2;
} else {
// one channel can occupy multiple memory blocks
mem_block_num = config->mem_block_symbols / SOC_RMT_MEM_WORDS_PER_CHANNEL;
if (mem_block_num * SOC_RMT_MEM_WORDS_PER_CHANNEL < config->mem_block_symbols) {
mem_block_num++;
}
tx_channel->ping_pong_symbols = mem_block_num * SOC_RMT_MEM_WORDS_PER_CHANNEL / 2;
}
tx_channel->base.mem_block_num = mem_block_num;
// search free channel and then register to the group
// memory blocks used by one channel must be continuous
uint32_t channel_mask = (1 << mem_block_num) - 1;
rmt_group_t *group = NULL;
int channel_id = -1;
for (int i = 0; i < SOC_RMT_GROUPS; i++) {
group = rmt_acquire_group_handle(i);
ESP_RETURN_ON_FALSE(group, ESP_ERR_NO_MEM, TAG, "no mem for group (%d)", i);
portENTER_CRITICAL(&group->spinlock);
for (int j = channel_scan_start; j < channel_scan_end; j++) {
if (!(group->occupy_mask & (channel_mask << j))) {
group->occupy_mask |= (channel_mask << j);
// the channel ID should index from 0
channel_id = j - RMT_TX_CHANNEL_OFFSET_IN_GROUP;
group->tx_channels[channel_id] = tx_channel;
break;
}
}
portEXIT_CRITICAL(&group->spinlock);
if (channel_id < 0) {
// didn't find a capable channel in the group, don't forget to release the group handle
rmt_release_group_handle(group);
group = NULL;
} else {
tx_channel->base.channel_id = channel_id;
tx_channel->base.channel_mask = channel_mask;
tx_channel->base.group = group;
break;
}
}
ESP_RETURN_ON_FALSE(channel_id >= 0, ESP_ERR_NOT_FOUND, TAG, "no free tx channels");
return ESP_OK;
}
static void rmt_tx_unregister_from_group(rmt_channel_t *channel, rmt_group_t *group)
{
portENTER_CRITICAL(&group->spinlock);
group->tx_channels[channel->channel_id] = NULL;
group->occupy_mask &= ~(channel->channel_mask << (channel->channel_id + RMT_TX_CHANNEL_OFFSET_IN_GROUP));
portEXIT_CRITICAL(&group->spinlock);
// channel has a reference on group, release it now
rmt_release_group_handle(group);
}
static esp_err_t rmt_tx_create_trans_queue(rmt_tx_channel_t *tx_channel, const rmt_tx_channel_config_t *config)
{
tx_channel->queue_size = config->trans_queue_depth;
// the queue only saves transaction description pointers
tx_channel->queues_storage = heap_caps_calloc(config->trans_queue_depth * RMT_TX_QUEUE_MAX, sizeof(rmt_tx_trans_desc_t *), RMT_MEM_ALLOC_CAPS);
ESP_RETURN_ON_FALSE(tx_channel->queues_storage, ESP_ERR_NO_MEM, TAG, "no mem for queue storage");
rmt_tx_trans_desc_t **pp_trans_desc = (rmt_tx_trans_desc_t **)tx_channel->queues_storage;
for (int i = 0; i < RMT_TX_QUEUE_MAX; i++) {
tx_channel->trans_queues[i] = xQueueCreateStatic(config->trans_queue_depth, sizeof(rmt_tx_trans_desc_t *),
(uint8_t *)pp_trans_desc, &tx_channel->trans_queue_structs[i]);
pp_trans_desc += config->trans_queue_depth;
// sanity check
assert(tx_channel->trans_queues[i]);
}
// initialize the ready queue
rmt_tx_trans_desc_t *p_trans_desc = NULL;
for (int i = 0; i < config->trans_queue_depth; i++) {
p_trans_desc = &tx_channel->trans_desc_pool[i];
ESP_RETURN_ON_FALSE(xQueueSend(tx_channel->trans_queues[RMT_TX_QUEUE_READY], &p_trans_desc, 0) == pdTRUE,
ESP_ERR_INVALID_STATE, TAG, "ready queue full");
}
return ESP_OK;
}
static esp_err_t rmt_tx_destroy(rmt_tx_channel_t *tx_channel)
{
if (tx_channel->base.intr) {
ESP_RETURN_ON_ERROR(esp_intr_free(tx_channel->base.intr), TAG, "delete interrupt service failed");
}
if (tx_channel->base.pm_lock) {
ESP_RETURN_ON_ERROR(esp_pm_lock_delete(tx_channel->base.pm_lock), TAG, "delete pm_lock failed");
}
#if SOC_RMT_SUPPORT_DMA
if (tx_channel->base.dma_chan) {
ESP_RETURN_ON_ERROR(gdma_del_channel(tx_channel->base.dma_chan), TAG, "delete dma channel failed");
}
#endif // SOC_RMT_SUPPORT_DMA
for (int i = 0; i < RMT_TX_QUEUE_MAX; i++) {
if (tx_channel->trans_queues[i]) {
vQueueDelete(tx_channel->trans_queues[i]);
}
}
if (tx_channel->queues_storage) {
free(tx_channel->queues_storage);
}
if (tx_channel->base.dma_mem_base) {
free(tx_channel->base.dma_mem_base);
}
if (tx_channel->base.group) {
// de-register channel from RMT group
rmt_tx_unregister_from_group(&tx_channel->base, tx_channel->base.group);
}
free(tx_channel);
return ESP_OK;
}
esp_err_t rmt_new_tx_channel(const rmt_tx_channel_config_t *config, rmt_channel_handle_t *ret_chan)
{
#if CONFIG_RMT_ENABLE_DEBUG_LOG
esp_log_level_set(TAG, ESP_LOG_DEBUG);
#endif
esp_err_t ret = ESP_OK;
rmt_tx_channel_t *tx_channel = NULL;
// Check if priority is valid
if (config->intr_priority) {
ESP_RETURN_ON_FALSE((config->intr_priority) > 0, ESP_ERR_INVALID_ARG, TAG, "invalid interrupt priority:%d", config->intr_priority);
ESP_RETURN_ON_FALSE(1 << (config->intr_priority) & RMT_ALLOW_INTR_PRIORITY_MASK, ESP_ERR_INVALID_ARG, TAG, "invalid interrupt priority:%d", config->intr_priority);
}
ESP_GOTO_ON_FALSE(config && ret_chan && config->resolution_hz && config->trans_queue_depth, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
ESP_GOTO_ON_FALSE(GPIO_IS_VALID_GPIO(config->gpio_num), ESP_ERR_INVALID_ARG, err, TAG, "invalid GPIO number");
ESP_GOTO_ON_FALSE((config->mem_block_symbols & 0x01) == 0 && config->mem_block_symbols >= SOC_RMT_MEM_WORDS_PER_CHANNEL,
ESP_ERR_INVALID_ARG, err, TAG, "mem_block_symbols must be even and at least %d", SOC_RMT_MEM_WORDS_PER_CHANNEL);
#if SOC_RMT_SUPPORT_DMA
// we only support 2 nodes ping-pong, if the configured memory block size needs more than two DMA descriptors, should treat it as invalid
ESP_GOTO_ON_FALSE(config->mem_block_symbols <= RMT_DMA_DESC_BUF_MAX_SIZE * RMT_DMA_NODES_PING_PONG / sizeof(rmt_symbol_word_t),
ESP_ERR_INVALID_ARG, err, TAG, "mem_block_symbols can't exceed %d",
RMT_DMA_DESC_BUF_MAX_SIZE * RMT_DMA_NODES_PING_PONG / sizeof(rmt_symbol_word_t));
#else
ESP_GOTO_ON_FALSE(config->flags.with_dma == 0, ESP_ERR_NOT_SUPPORTED, err, TAG, "DMA not supported");
#endif
// malloc channel memory
uint32_t mem_caps = RMT_MEM_ALLOC_CAPS;
if (config->flags.with_dma) {
// DMA descriptors must be placed in internal SRAM
mem_caps |= MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA;
}
tx_channel = heap_caps_calloc(1, sizeof(rmt_tx_channel_t) + sizeof(rmt_tx_trans_desc_t) * config->trans_queue_depth, mem_caps);
ESP_GOTO_ON_FALSE(tx_channel, ESP_ERR_NO_MEM, err, TAG, "no mem for tx channel");
// create transaction queues
ESP_GOTO_ON_ERROR(rmt_tx_create_trans_queue(tx_channel, config), err, TAG, "install trans queues failed");
// register the channel to group
ESP_GOTO_ON_ERROR(rmt_tx_register_to_group(tx_channel, config), err, TAG, "register channel failed");
rmt_group_t *group = tx_channel->base.group;
rmt_hal_context_t *hal = &group->hal;
int channel_id = tx_channel->base.channel_id;
int group_id = group->group_id;
// reset channel, make sure the TX engine is not working, and events are cleared
portENTER_CRITICAL(&group->spinlock);
rmt_hal_tx_channel_reset(&group->hal, channel_id);
portEXIT_CRITICAL(&group->spinlock);
// install tx interrupt
// --- install interrupt service
// interrupt is mandatory to run basic RMT transactions, so it's not lazy installed in `rmt_tx_register_event_callbacks()`
// 1-- Set user specified priority to `group->intr_priority`
bool priority_conflict = rmt_set_intr_priority_to_group(group, config->intr_priority);
ESP_GOTO_ON_FALSE(!priority_conflict, ESP_ERR_INVALID_ARG, err, TAG, "intr_priority conflict");
// 2-- Get interrupt allocation flag
int isr_flags = rmt_get_isr_flags(group);
// 3-- Allocate interrupt using isr_flag
ret = esp_intr_alloc_intrstatus(rmt_periph_signals.groups[group_id].irq, isr_flags,
(uint32_t) rmt_ll_get_interrupt_status_reg(hal->regs),
RMT_LL_EVENT_TX_MASK(channel_id), rmt_tx_default_isr, tx_channel,
&tx_channel->base.intr);
ESP_GOTO_ON_ERROR(ret, err, TAG, "install tx interrupt failed");
// install DMA service
#if SOC_RMT_SUPPORT_DMA
if (config->flags.with_dma) {
ESP_GOTO_ON_ERROR(rmt_tx_init_dma_link(tx_channel, config), err, TAG, "install tx DMA failed");
}
#endif
// select the clock source
ESP_GOTO_ON_ERROR(rmt_select_periph_clock(&tx_channel->base, config->clk_src), err, TAG, "set group clock failed");
// set channel clock resolution, find the divider to get the closest resolution
uint32_t real_div = (group->resolution_hz + config->resolution_hz / 2) / config->resolution_hz;
rmt_ll_tx_set_channel_clock_div(hal->regs, channel_id, real_div);
// resolution lost due to division, calculate the real resolution
tx_channel->base.resolution_hz = group->resolution_hz / real_div;
if (tx_channel->base.resolution_hz != config->resolution_hz) {
ESP_LOGW(TAG, "channel resolution loss, real=%"PRIu32, tx_channel->base.resolution_hz);
}
rmt_ll_tx_set_mem_blocks(hal->regs, channel_id, tx_channel->base.mem_block_num);
// set limit threshold, after transmit ping_pong_symbols size, an interrupt event would be generated
rmt_ll_tx_set_limit(hal->regs, channel_id, tx_channel->ping_pong_symbols);
// disable carrier modulation by default, can reenable by `rmt_apply_carrier()`
rmt_ll_tx_enable_carrier_modulation(hal->regs, channel_id, false);
// idle level is determined by register value
rmt_ll_tx_fix_idle_level(hal->regs, channel_id, 0, true);
// always enable tx wrap, both DMA mode and ping-pong mode rely this feature
rmt_ll_tx_enable_wrap(hal->regs, channel_id, true);
// GPIO Matrix/MUX configuration
tx_channel->base.gpio_num = config->gpio_num;
gpio_config_t gpio_conf = {
.intr_type = GPIO_INTR_DISABLE,
// also enable the input path if `io_loop_back` is on, this is useful for bi-directional buses
.mode = (config->flags.io_od_mode ? GPIO_MODE_OUTPUT_OD : GPIO_MODE_OUTPUT) | (config->flags.io_loop_back ? GPIO_MODE_INPUT : 0),
.pull_down_en = false,
.pull_up_en = true,
.pin_bit_mask = 1ULL << config->gpio_num,
};
ESP_GOTO_ON_ERROR(gpio_config(&gpio_conf), err, TAG, "config GPIO failed");
esp_rom_gpio_connect_out_signal(config->gpio_num,
rmt_periph_signals.groups[group_id].channels[channel_id + RMT_TX_CHANNEL_OFFSET_IN_GROUP].tx_sig,
config->flags.invert_out, false);
portMUX_INITIALIZE(&tx_channel->base.spinlock);
atomic_init(&tx_channel->base.fsm, RMT_FSM_INIT);
tx_channel->base.direction = RMT_CHANNEL_DIRECTION_TX;
tx_channel->base.hw_mem_base = &RMTMEM.channels[channel_id + RMT_TX_CHANNEL_OFFSET_IN_GROUP].symbols[0];
// polymorphic methods
tx_channel->base.del = rmt_del_tx_channel;
tx_channel->base.set_carrier_action = rmt_tx_modulate_carrier;
tx_channel->base.enable = rmt_tx_enable;
tx_channel->base.disable = rmt_tx_disable;
// return general channel handle
*ret_chan = &tx_channel->base;
ESP_LOGD(TAG, "new tx channel(%d,%d) at %p, gpio=%d, res=%"PRIu32"Hz, hw_mem_base=%p, dma_mem_base=%p, ping_pong_size=%zu, queue_depth=%zu",
group_id, channel_id, tx_channel, config->gpio_num, tx_channel->base.resolution_hz,
tx_channel->base.hw_mem_base, tx_channel->base.dma_mem_base, tx_channel->ping_pong_symbols, tx_channel->queue_size);
return ESP_OK;
err:
if (tx_channel) {
rmt_tx_destroy(tx_channel);
}
return ret;
}
static esp_err_t rmt_del_tx_channel(rmt_channel_handle_t channel)
{
ESP_RETURN_ON_FALSE(atomic_load(&channel->fsm) == RMT_FSM_INIT,
ESP_ERR_INVALID_STATE, TAG, "channel not in init state");
rmt_tx_channel_t *tx_chan = __containerof(channel, rmt_tx_channel_t, base);
rmt_group_t *group = channel->group;
int group_id = group->group_id;
int channel_id = channel->channel_id;
ESP_LOGD(TAG, "del tx channel(%d,%d)", group_id, channel_id);
// recycle memory resource
ESP_RETURN_ON_ERROR(rmt_tx_destroy(tx_chan), TAG, "destroy tx channel failed");
return ESP_OK;
}
esp_err_t rmt_new_sync_manager(const rmt_sync_manager_config_t *config, rmt_sync_manager_handle_t *ret_synchro)
{
#if !SOC_RMT_SUPPORT_TX_SYNCHRO
ESP_RETURN_ON_FALSE(false, ESP_ERR_NOT_SUPPORTED, TAG, "sync manager not supported");
#else
esp_err_t ret = ESP_OK;
rmt_sync_manager_t *synchro = NULL;
ESP_GOTO_ON_FALSE(config && ret_synchro && config->tx_channel_array && config->array_size, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
synchro = heap_caps_calloc(1, sizeof(rmt_sync_manager_t) + sizeof(rmt_channel_handle_t) * config->array_size, RMT_MEM_ALLOC_CAPS);
ESP_GOTO_ON_FALSE(synchro, ESP_ERR_NO_MEM, err, TAG, "no mem for sync manager");
for (size_t i = 0; i < config->array_size; i++) {
synchro->tx_channel_array[i] = config->tx_channel_array[i];
}
synchro->array_size = config->array_size;
int group_id = config->tx_channel_array[0]->group->group_id;
// acquire group handle, increase reference count
rmt_group_t *group = rmt_acquire_group_handle(group_id);
// sanity check
assert(group);
synchro->group = group;
// calculate the mask of the channels to be managed
uint32_t channel_mask = 0;
rmt_channel_handle_t channel = NULL;
for (size_t i = 0; i < config->array_size; i++) {
channel = config->tx_channel_array[i];
ESP_GOTO_ON_FALSE(channel->direction == RMT_CHANNEL_DIRECTION_TX, ESP_ERR_INVALID_ARG, err, TAG, "sync manager supports TX channel only");
ESP_GOTO_ON_FALSE(channel->group == group, ESP_ERR_INVALID_ARG, err, TAG, "channels to be managed should locate in the same group");
ESP_GOTO_ON_FALSE(atomic_load(&channel->fsm) == RMT_FSM_ENABLE, ESP_ERR_INVALID_STATE, err, TAG, "channel not in enable state");
channel_mask |= 1 << channel->channel_id;
}
synchro->channel_mask = channel_mask;
// search and register sync manager to group
bool new_synchro = false;
portENTER_CRITICAL(&group->spinlock);
if (group->sync_manager == NULL) {
group->sync_manager = synchro;
new_synchro = true;
}
portEXIT_CRITICAL(&group->spinlock);
ESP_GOTO_ON_FALSE(new_synchro, ESP_ERR_NOT_FOUND, err, TAG, "no free sync manager in the group");
// enable sync manager
portENTER_CRITICAL(&group->spinlock);
rmt_ll_tx_enable_sync(group->hal.regs, true);
rmt_ll_tx_sync_group_add_channels(group->hal.regs, channel_mask);
rmt_ll_tx_reset_channels_clock_div(group->hal.regs, channel_mask);
// ensure the reading cursor of each channel is pulled back to the starting line
for (size_t i = 0; i < config->array_size; i++) {
rmt_ll_tx_reset_pointer(group->hal.regs, config->tx_channel_array[i]->channel_id);
}
portEXIT_CRITICAL(&group->spinlock);
*ret_synchro = synchro;
ESP_LOGD(TAG, "new sync manager at %p, with channel mask:%02"PRIx32, synchro, synchro->channel_mask);
return ESP_OK;
err:
if (synchro) {
if (synchro->group) {
rmt_release_group_handle(synchro->group);
}
free(synchro);
}
return ret;
#endif // !SOC_RMT_SUPPORT_TX_SYNCHRO
}
esp_err_t rmt_sync_reset(rmt_sync_manager_handle_t synchro)
{
#if !SOC_RMT_SUPPORT_TX_SYNCHRO
ESP_RETURN_ON_FALSE(false, ESP_ERR_NOT_SUPPORTED, TAG, "sync manager not supported");
#else
ESP_RETURN_ON_FALSE(synchro, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
rmt_group_t *group = synchro->group;
portENTER_CRITICAL(&group->spinlock);
rmt_ll_tx_reset_channels_clock_div(group->hal.regs, synchro->channel_mask);
for (size_t i = 0; i < synchro->array_size; i++) {
rmt_ll_tx_reset_pointer(group->hal.regs, synchro->tx_channel_array[i]->channel_id);
}
portEXIT_CRITICAL(&group->spinlock);
return ESP_OK;
#endif // !SOC_RMT_SUPPORT_TX_SYNCHRO
}
esp_err_t rmt_del_sync_manager(rmt_sync_manager_handle_t synchro)
{
#if !SOC_RMT_SUPPORT_TX_SYNCHRO
ESP_RETURN_ON_FALSE(false, ESP_ERR_NOT_SUPPORTED, TAG, "sync manager not supported");
#else
ESP_RETURN_ON_FALSE(synchro, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
rmt_group_t *group = synchro->group;
int group_id = group->group_id;
portENTER_CRITICAL(&group->spinlock);
group->sync_manager = NULL;
// disable sync manager
rmt_ll_tx_enable_sync(group->hal.regs, false);
rmt_ll_tx_sync_group_remove_channels(group->hal.regs, synchro->channel_mask);
portEXIT_CRITICAL(&group->spinlock);
free(synchro);
ESP_LOGD(TAG, "del sync manager in group(%d)", group_id);
rmt_release_group_handle(group);
return ESP_OK;
#endif // !SOC_RMT_SUPPORT_TX_SYNCHRO
}
esp_err_t rmt_tx_register_event_callbacks(rmt_channel_handle_t channel, const rmt_tx_event_callbacks_t *cbs, void *user_data)
{
ESP_RETURN_ON_FALSE(channel && cbs, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
ESP_RETURN_ON_FALSE(channel->direction == RMT_CHANNEL_DIRECTION_TX, ESP_ERR_INVALID_ARG, TAG, "invalid channel direction");
rmt_tx_channel_t *tx_chan = __containerof(channel, rmt_tx_channel_t, base);
#if CONFIG_RMT_ISR_IRAM_SAFE
if (cbs->on_trans_done) {
ESP_RETURN_ON_FALSE(esp_ptr_in_iram(cbs->on_trans_done), ESP_ERR_INVALID_ARG, TAG, "on_trans_done callback not in IRAM");
}
if (user_data) {
ESP_RETURN_ON_FALSE(esp_ptr_internal(user_data), ESP_ERR_INVALID_ARG, TAG, "user context not in internal RAM");
}
#endif
tx_chan->on_trans_done = cbs->on_trans_done;
tx_chan->user_data = user_data;
return ESP_OK;
}
esp_err_t rmt_transmit(rmt_channel_handle_t channel, rmt_encoder_t *encoder, const void *payload, size_t payload_bytes, const rmt_transmit_config_t *config)
{
ESP_RETURN_ON_FALSE(channel && encoder && payload && payload_bytes && config, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
ESP_RETURN_ON_FALSE(channel->direction == RMT_CHANNEL_DIRECTION_TX, ESP_ERR_INVALID_ARG, TAG, "invalid channel direction");
#if !SOC_RMT_SUPPORT_TX_LOOP_COUNT
ESP_RETURN_ON_FALSE(config->loop_count <= 0, ESP_ERR_NOT_SUPPORTED, TAG, "loop count is not supported");
#endif // !SOC_RMT_SUPPORT_TX_LOOP_COUNT
#if CONFIG_RMT_ISR_IRAM_SAFE
// payload is retrieved by the encoder, we should make sure it's still accessible even when the cache is disabled
ESP_RETURN_ON_FALSE(esp_ptr_internal(payload), ESP_ERR_INVALID_ARG, TAG, "payload not in internal RAM");
#endif
TickType_t queue_wait_ticks = portMAX_DELAY;
if (config->flags.queue_nonblocking) {
queue_wait_ticks = 0;
}
rmt_tx_channel_t *tx_chan = __containerof(channel, rmt_tx_channel_t, base);
rmt_tx_trans_desc_t *t = NULL;
// acquire one transaction description from ready queue or complete queue
if (xQueueReceive(tx_chan->trans_queues[RMT_TX_QUEUE_READY], &t, 0) != pdTRUE) {
if (xQueueReceive(tx_chan->trans_queues[RMT_TX_QUEUE_COMPLETE], &t, queue_wait_ticks) == pdTRUE) {
tx_chan->num_trans_inflight--;
}
}
ESP_RETURN_ON_FALSE(t, ESP_ERR_INVALID_STATE, TAG, "no free transaction descriptor, please consider increasing trans_queue_depth");
// fill in the transaction descriptor
memset(t, 0, sizeof(rmt_tx_trans_desc_t));
t->encoder = encoder;
t->payload = payload;
t->payload_bytes = payload_bytes;
t->loop_count = config->loop_count;
t->remain_loop_count = t->loop_count;
t->flags.eot_level = config->flags.eot_level;
// send the transaction descriptor to queue
if (xQueueSend(tx_chan->trans_queues[RMT_TX_QUEUE_PROGRESS], &t, 0) == pdTRUE) {
tx_chan->num_trans_inflight++;
} else {
// put the trans descriptor back to ready_queue
ESP_RETURN_ON_FALSE(xQueueSend(tx_chan->trans_queues[RMT_TX_QUEUE_READY], &t, 0) == pdTRUE,
ESP_ERR_INVALID_STATE, TAG, "ready queue full");
}
// check if we need to start one pending transaction
rmt_fsm_t expected_fsm = RMT_FSM_ENABLE;
if (atomic_compare_exchange_strong(&channel->fsm, &expected_fsm, RMT_FSM_RUN_WAIT)) {
// check if we need to start one transaction
if (xQueueReceive(tx_chan->trans_queues[RMT_TX_QUEUE_PROGRESS], &t, 0) == pdTRUE) {
atomic_store(&channel->fsm, RMT_FSM_RUN);
rmt_tx_do_transaction(tx_chan, t);
} else {
atomic_store(&channel->fsm, RMT_FSM_ENABLE);
}
}
return ESP_OK;
}
esp_err_t rmt_tx_wait_all_done(rmt_channel_handle_t channel, int timeout_ms)
{
ESP_RETURN_ON_FALSE(channel, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
rmt_tx_channel_t *tx_chan = __containerof(channel, rmt_tx_channel_t, base);
TickType_t wait_ticks = timeout_ms < 0 ? portMAX_DELAY : pdMS_TO_TICKS(timeout_ms);
// recycle all transaction that are on the fly
rmt_tx_trans_desc_t *t = NULL;
size_t num_trans_inflight = tx_chan->num_trans_inflight;
for (size_t i = 0; i < num_trans_inflight; i++) {
ESP_RETURN_ON_FALSE(xQueueReceive(tx_chan->trans_queues[RMT_TX_QUEUE_COMPLETE], &t, wait_ticks) == pdTRUE,
ESP_ERR_TIMEOUT, TAG, "flush timeout");
ESP_RETURN_ON_FALSE(xQueueSend(tx_chan->trans_queues[RMT_TX_QUEUE_READY], &t, 0) == pdTRUE,
ESP_ERR_INVALID_STATE, TAG, "ready queue full");
tx_chan->num_trans_inflight--;
}
return ESP_OK;
}
static void IRAM_ATTR rmt_tx_mark_eof(rmt_tx_channel_t *tx_chan)
{
rmt_channel_t *channel = &tx_chan->base;
rmt_group_t *group = channel->group;
int channel_id = channel->channel_id;
rmt_symbol_word_t *mem_to = channel->dma_chan ? channel->dma_mem_base : channel->hw_mem_base;
rmt_tx_trans_desc_t *cur_trans = tx_chan->cur_trans;
dma_descriptor_t *desc = NULL;
// a RMT word whose duration is zero means a "stop" pattern
mem_to[tx_chan->mem_off++] = (rmt_symbol_word_t) {
.duration0 = 0,
.level0 = cur_trans->flags.eot_level,
.duration1 = 0,
.level1 = cur_trans->flags.eot_level,
};
size_t off = 0;
if (channel->dma_chan) {
if (tx_chan->mem_off <= tx_chan->ping_pong_symbols) {
desc = &tx_chan->dma_nodes[0];
off = tx_chan->mem_off;
} else {
desc = &tx_chan->dma_nodes[1];
off = tx_chan->mem_off - tx_chan->ping_pong_symbols;
}
desc->dw0.owner = DMA_DESCRIPTOR_BUFFER_OWNER_DMA;
desc->dw0.length = off * sizeof(rmt_symbol_word_t);
// break down the DMA descriptor link
desc->next = NULL;
} else {
portENTER_CRITICAL_ISR(&group->spinlock);
// This is the end of a sequence of encoding sessions, disable the threshold interrupt as no more data will be put into RMT memory block
rmt_ll_enable_interrupt(group->hal.regs, RMT_LL_EVENT_TX_THRES(channel_id), false);
portEXIT_CRITICAL_ISR(&group->spinlock);
}
}
static size_t IRAM_ATTR rmt_encode_check_result(rmt_tx_channel_t *tx_chan, rmt_tx_trans_desc_t *t)
{
rmt_encode_state_t encode_state = RMT_ENCODING_RESET;
rmt_encoder_handle_t encoder = t->encoder;
size_t encoded_symbols = encoder->encode(encoder, &tx_chan->base, t->payload, t->payload_bytes, &encode_state);
if (encode_state & RMT_ENCODING_COMPLETE) {
t->flags.encoding_done = true;
// inserting EOF symbol if there's extra space
if (!(encode_state & RMT_ENCODING_MEM_FULL)) {
rmt_tx_mark_eof(tx_chan);
encoded_symbols += 1;
}
}
// for loop transaction, the memory block should accommodate all encoded RMT symbols
if (t->loop_count != 0) {
if (unlikely(encoded_symbols > tx_chan->base.mem_block_num * SOC_RMT_MEM_WORDS_PER_CHANNEL)) {
ESP_DRAM_LOGE(TAG, "encoding artifacts can't exceed hw memory block for loop transmission");
}
}
return encoded_symbols;
}
static void IRAM_ATTR rmt_tx_do_transaction(rmt_tx_channel_t *tx_chan, rmt_tx_trans_desc_t *t)
{
rmt_channel_t *channel = &tx_chan->base;
rmt_group_t *group = channel->group;
rmt_hal_context_t *hal = &group->hal;
int channel_id = channel->channel_id;
// update current transaction
tx_chan->cur_trans = t;
#if SOC_RMT_SUPPORT_DMA
if (channel->dma_chan) {
gdma_reset(channel->dma_chan);
// chain the descritpros into a ring, and will break it in `rmt_encode_eof()`
for (int i = 0; i < RMT_DMA_NODES_PING_PONG; i++) {
tx_chan->dma_nodes[i].next = &tx_chan->dma_nodes[i + 1];
tx_chan->dma_nodes[i].dw0.owner = DMA_DESCRIPTOR_BUFFER_OWNER_CPU;
}
tx_chan->dma_nodes[1].next = &tx_chan->dma_nodes[0];
}
#endif // SOC_RMT_SUPPORT_DMA
// set transaction specific parameters
portENTER_CRITICAL_SAFE(&channel->spinlock);
rmt_ll_tx_reset_pointer(hal->regs, channel_id); // reset pointer for new transaction
rmt_ll_tx_enable_loop(hal->regs, channel_id, t->loop_count != 0);
#if SOC_RMT_SUPPORT_TX_LOOP_AUTO_STOP
rmt_ll_tx_enable_loop_autostop(hal->regs, channel_id, true);
#endif // SOC_RMT_SUPPORT_TX_LOOP_AUTO_STOP
#if SOC_RMT_SUPPORT_TX_LOOP_COUNT
rmt_ll_tx_reset_loop_count(hal->regs, channel_id);
rmt_ll_tx_enable_loop_count(hal->regs, channel_id, t->loop_count > 0);
// transfer loops in batches
if (t->remain_loop_count > 0) {
uint32_t this_loop_count = MIN(t->remain_loop_count, RMT_LL_MAX_LOOP_COUNT_PER_BATCH);
rmt_ll_tx_set_loop_count(hal->regs, channel_id, this_loop_count);
t->remain_loop_count -= this_loop_count;
}
#endif // SOC_RMT_SUPPORT_TX_LOOP_COUNT
portEXIT_CRITICAL_SAFE(&channel->spinlock);
// enable/disable specific interrupts
portENTER_CRITICAL_SAFE(&group->spinlock);
#if SOC_RMT_SUPPORT_TX_LOOP_COUNT
rmt_ll_enable_interrupt(hal->regs, RMT_LL_EVENT_TX_LOOP_END(channel_id), t->loop_count > 0);
#endif // SOC_RMT_SUPPORT_TX_LOOP_COUNT
// in DMA mode, DMA eof event plays the similar functionality to this threshold interrupt, so only enable it for non-DMA mode
if (!channel->dma_chan) {
// don't enable threshold interrupt with loop mode on
// threshold interrupt will be disabled in `rmt_encode_eof()`
rmt_ll_enable_interrupt(hal->regs, RMT_LL_EVENT_TX_THRES(channel_id), t->loop_count == 0);
// Threshold interrupt will be generated by accident, clear it before starting new transmission
rmt_ll_clear_interrupt_status(hal->regs, RMT_LL_EVENT_TX_THRES(channel_id));
}
// don't generate trans done event for loop transmission
rmt_ll_enable_interrupt(hal->regs, RMT_LL_EVENT_TX_DONE(channel_id), t->loop_count == 0);
portEXIT_CRITICAL_SAFE(&group->spinlock);
// at the beginning of a new transaction, encoding memory offset should start from zero.
// It will increase in the encode function e.g. `rmt_encode_copy()`
tx_chan->mem_off = 0;
// use the full memory block for the beginning encoding session
tx_chan->mem_end = tx_chan->ping_pong_symbols * 2;
// perform the encoding session, return the number of encoded symbols
t->transmitted_symbol_num = rmt_encode_check_result(tx_chan, t);
// we're going to perform ping-pong operation, so the next encoding end position is the middle
tx_chan->mem_end = tx_chan->ping_pong_symbols;
#if SOC_RMT_SUPPORT_DMA
if (channel->dma_chan) {
gdma_start(channel->dma_chan, (intptr_t)tx_chan->dma_nodes);
// delay a while, wait for DMA data going to RMT memory block
esp_rom_delay_us(1);
}
#endif
// turn on the TX machine
portENTER_CRITICAL_SAFE(&channel->spinlock);
rmt_ll_tx_fix_idle_level(hal->regs, channel_id, t->flags.eot_level, true);
rmt_ll_tx_start(hal->regs, channel_id);
portEXIT_CRITICAL_SAFE(&channel->spinlock);
}
static esp_err_t rmt_tx_enable(rmt_channel_handle_t channel)
{
// can enable the channel when it's in "init" state
rmt_fsm_t expected_fsm = RMT_FSM_INIT;
ESP_RETURN_ON_FALSE(atomic_compare_exchange_strong(&channel->fsm, &expected_fsm, RMT_FSM_ENABLE_WAIT),
ESP_ERR_INVALID_STATE, TAG, "channel not in init state");
rmt_tx_channel_t *tx_chan = __containerof(channel, rmt_tx_channel_t, base);
// acquire power manager lock
if (channel->pm_lock) {
esp_pm_lock_acquire(channel->pm_lock);
}
#if SOC_RMT_SUPPORT_DMA
rmt_group_t *group = channel->group;
rmt_hal_context_t *hal = &group->hal;
int channel_id = channel->channel_id;
if (channel->dma_chan) {
// enable the DMA access mode
portENTER_CRITICAL(&channel->spinlock);
rmt_ll_tx_enable_dma(hal->regs, channel_id, true);
portEXIT_CRITICAL(&channel->spinlock);
gdma_connect(channel->dma_chan, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_RMT, 0));
}
#endif // SOC_RMT_SUPPORT_DMA
atomic_store(&channel->fsm, RMT_FSM_ENABLE);
// check if we need to start one pending transaction
rmt_tx_trans_desc_t *t = NULL;
expected_fsm = RMT_FSM_ENABLE;
if (atomic_compare_exchange_strong(&channel->fsm, &expected_fsm, RMT_FSM_RUN_WAIT)) {
if (xQueueReceive(tx_chan->trans_queues[RMT_TX_QUEUE_PROGRESS], &t, 0) == pdTRUE) {
// sanity check
assert(t);
atomic_store(&channel->fsm, RMT_FSM_RUN);
rmt_tx_do_transaction(tx_chan, t);
} else {
atomic_store(&channel->fsm, RMT_FSM_ENABLE);
}
}
return ESP_OK;
}
static esp_err_t rmt_tx_disable(rmt_channel_handle_t channel)
{
rmt_tx_channel_t *tx_chan = __containerof(channel, rmt_tx_channel_t, base);
rmt_group_t *group = channel->group;
rmt_hal_context_t *hal = &group->hal;
int channel_id = channel->channel_id;
// can disable the channel when it's in `enable` or `run` state
bool valid_state = false;
rmt_fsm_t expected_fsm = RMT_FSM_ENABLE;
if (atomic_compare_exchange_strong(&channel->fsm, &expected_fsm, RMT_FSM_INIT_WAIT)) {
valid_state = true;
}
expected_fsm = RMT_FSM_RUN;
if (atomic_compare_exchange_strong(&channel->fsm, &expected_fsm, RMT_FSM_INIT_WAIT)) {
valid_state = true;
// disable the hardware
portENTER_CRITICAL(&channel->spinlock);
rmt_ll_tx_enable_loop(hal->regs, channel->channel_id, false);
#if SOC_RMT_SUPPORT_TX_ASYNC_STOP
rmt_ll_tx_stop(hal->regs, channel->channel_id);
#endif
portEXIT_CRITICAL(&channel->spinlock);
portENTER_CRITICAL(&group->spinlock);
rmt_ll_enable_interrupt(hal->regs, RMT_LL_EVENT_TX_MASK(channel_id), false);
#if !SOC_RMT_SUPPORT_TX_ASYNC_STOP
// we do a trick to stop the undergoing transmission
// stop interrupt, insert EOF marker to the RMT memory, polling the trans_done event
channel->hw_mem_base[0].val = 0;
while (!(rmt_ll_tx_get_interrupt_status_raw(hal->regs, channel_id) & RMT_LL_EVENT_TX_DONE(channel_id))) {}
#endif
rmt_ll_clear_interrupt_status(hal->regs, RMT_LL_EVENT_TX_MASK(channel_id));
portEXIT_CRITICAL(&group->spinlock);
}
ESP_RETURN_ON_FALSE(valid_state, ESP_ERR_INVALID_STATE, TAG, "channel can't be disabled in state %d", expected_fsm);
// disable the DMA
#if SOC_RMT_SUPPORT_DMA
if (channel->dma_chan) {
gdma_stop(channel->dma_chan);
gdma_disconnect(channel->dma_chan);
// disable DMA access mode
portENTER_CRITICAL(&channel->spinlock);
rmt_ll_tx_enable_dma(hal->regs, channel_id, false);
portEXIT_CRITICAL(&channel->spinlock);
}
#endif
// recycle the interrupted transaction
if (tx_chan->cur_trans) {
xQueueSend(tx_chan->trans_queues[RMT_TX_QUEUE_COMPLETE], &tx_chan->cur_trans, 0);
// reset corresponding encoder
rmt_encoder_reset(tx_chan->cur_trans->encoder);
}
tx_chan->cur_trans = NULL;
// release power manager lock
if (channel->pm_lock) {
ESP_RETURN_ON_ERROR(esp_pm_lock_release(channel->pm_lock), TAG, "release pm_lock failed");
}
// finally we switch to the INIT state
atomic_store(&channel->fsm, RMT_FSM_INIT);
return ESP_OK;
}
static esp_err_t rmt_tx_modulate_carrier(rmt_channel_handle_t channel, const rmt_carrier_config_t *config)
{
rmt_group_t *group = channel->group;
rmt_hal_context_t *hal = &group->hal;
int group_id = group->group_id;
int channel_id = channel->channel_id;
uint32_t real_frequency = 0;
if (config && config->frequency_hz) {
// carrier module works base on group clock
uint32_t total_ticks = group->resolution_hz / config->frequency_hz; // Note this division operation will lose precision
uint32_t high_ticks = total_ticks * config->duty_cycle;
uint32_t low_ticks = total_ticks - high_ticks;
portENTER_CRITICAL(&channel->spinlock);
rmt_ll_tx_set_carrier_level(hal->regs, channel_id, !config->flags.polarity_active_low);
rmt_ll_tx_set_carrier_high_low_ticks(hal->regs, channel_id, high_ticks, low_ticks);
#if SOC_RMT_SUPPORT_TX_CARRIER_DATA_ONLY
rmt_ll_tx_enable_carrier_always_on(hal->regs, channel_id, config->flags.always_on);
#endif
portEXIT_CRITICAL(&channel->spinlock);
// save real carrier frequency
real_frequency = group->resolution_hz / total_ticks;
}
// enable/disable carrier modulation
portENTER_CRITICAL(&channel->spinlock);
rmt_ll_tx_enable_carrier_modulation(hal->regs, channel_id, real_frequency > 0);
portEXIT_CRITICAL(&channel->spinlock);
if (real_frequency > 0) {
ESP_LOGD(TAG, "enable carrier modulation for channel(%d,%d), freq=%"PRIu32"Hz", group_id, channel_id, real_frequency);
} else {
ESP_LOGD(TAG, "disable carrier modulation for channel(%d,%d)", group_id, channel_id);
}
return ESP_OK;
}
static bool IRAM_ATTR rmt_isr_handle_tx_threshold(rmt_tx_channel_t *tx_chan)
{
// continue ping-pong transmission
rmt_tx_trans_desc_t *t = tx_chan->cur_trans;
size_t encoded_symbols = t->transmitted_symbol_num;
// encoding finished, only need to send the EOF symbol
if (t->flags.encoding_done) {
rmt_tx_mark_eof(tx_chan);
encoded_symbols += 1;
} else {
encoded_symbols += rmt_encode_check_result(tx_chan, t);
}
t->transmitted_symbol_num = encoded_symbols;
tx_chan->mem_end = tx_chan->ping_pong_symbols * 3 - tx_chan->mem_end; // mem_end equals to either ping_pong_symbols or ping_pong_symbols*2
return false;
}
static bool IRAM_ATTR rmt_isr_handle_tx_done(rmt_tx_channel_t *tx_chan)
{
rmt_channel_t *channel = &tx_chan->base;
BaseType_t awoken = pdFALSE;
rmt_tx_trans_desc_t *trans_desc = NULL;
bool need_yield = false;
rmt_fsm_t expected_fsm = RMT_FSM_RUN;
if (atomic_compare_exchange_strong(&channel->fsm, &expected_fsm, RMT_FSM_ENABLE_WAIT)) {
trans_desc = tx_chan->cur_trans;
// move current finished transaction to the complete queue
xQueueSendFromISR(tx_chan->trans_queues[RMT_TX_QUEUE_COMPLETE], &trans_desc, &awoken);
if (awoken == pdTRUE) {
need_yield = true;
}
tx_chan->cur_trans = NULL;
atomic_store(&channel->fsm, RMT_FSM_ENABLE);
// invoke callback
rmt_tx_done_callback_t done_cb = tx_chan->on_trans_done;
if (done_cb) {
rmt_tx_done_event_data_t edata = {
.num_symbols = trans_desc->transmitted_symbol_num,
};
if (done_cb(channel, &edata, tx_chan->user_data)) {
need_yield = true;
}
}
}
// let's try start the next pending transaction
expected_fsm = RMT_FSM_ENABLE;
if (atomic_compare_exchange_strong(&channel->fsm, &expected_fsm, RMT_FSM_RUN_WAIT)) {
if (xQueueReceiveFromISR(tx_chan->trans_queues[RMT_TX_QUEUE_PROGRESS], &trans_desc, &awoken) == pdTRUE) {
// sanity check
assert(trans_desc);
atomic_store(&channel->fsm, RMT_FSM_RUN);
// begin a new transaction
rmt_tx_do_transaction(tx_chan, trans_desc);
if (awoken == pdTRUE) {
need_yield = true;
}
} else {
atomic_store(&channel->fsm, RMT_FSM_ENABLE);
}
}
return need_yield;
}
#if SOC_RMT_SUPPORT_TX_LOOP_COUNT
static bool IRAM_ATTR rmt_isr_handle_tx_loop_end(rmt_tx_channel_t *tx_chan)
{
rmt_channel_t *channel = &tx_chan->base;
rmt_group_t *group = channel->group;
rmt_hal_context_t *hal = &group->hal;
uint32_t channel_id = channel->channel_id;
BaseType_t awoken = pdFALSE;
rmt_tx_trans_desc_t *trans_desc = NULL;
bool need_yield = false;
trans_desc = tx_chan->cur_trans;
if (trans_desc) {
#if !SOC_RMT_SUPPORT_TX_LOOP_AUTO_STOP
portENTER_CRITICAL_ISR(&channel->spinlock);
// This is a workaround for chips that don't support loop auto stop
// Although we stop the transaction immediately in ISR handler, it's still possible that some rmt symbols have sneaked out
rmt_ll_tx_stop(hal->regs, channel_id);
portEXIT_CRITICAL_ISR(&channel->spinlock);
#endif // SOC_RMT_SUPPORT_TX_LOOP_AUTO_STOP
// continue unfinished loop transaction
if (trans_desc->remain_loop_count) {
uint32_t this_loop_count = MIN(trans_desc->remain_loop_count, RMT_LL_MAX_LOOP_COUNT_PER_BATCH);
trans_desc->remain_loop_count -= this_loop_count;
portENTER_CRITICAL_ISR(&channel->spinlock);
rmt_ll_tx_set_loop_count(hal->regs, channel_id, this_loop_count);
rmt_ll_tx_reset_pointer(hal->regs, channel_id);
// continue the loop transmission, don't need to fill the RMT symbols again, just restart the engine
rmt_ll_tx_start(hal->regs, channel_id);
portEXIT_CRITICAL_ISR(&channel->spinlock);
return need_yield;
}
// loop transaction finished
rmt_fsm_t expected_fsm = RMT_FSM_RUN;
if (atomic_compare_exchange_strong(&channel->fsm, &expected_fsm, RMT_FSM_ENABLE_WAIT)) {
// move current finished transaction to the complete queue
xQueueSendFromISR(tx_chan->trans_queues[RMT_TX_QUEUE_COMPLETE], &trans_desc, &awoken);
if (awoken == pdTRUE) {
need_yield = true;
}
tx_chan->cur_trans = NULL;
atomic_store(&channel->fsm, RMT_FSM_ENABLE);
// invoke callback
rmt_tx_done_callback_t done_cb = tx_chan->on_trans_done;
if (done_cb) {
rmt_tx_done_event_data_t edata = {
.num_symbols = trans_desc->transmitted_symbol_num,
};
if (done_cb(channel, &edata, tx_chan->user_data)) {
need_yield = true;
}
}
}
// let's try start the next pending transaction
expected_fsm = RMT_FSM_ENABLE;
if (atomic_compare_exchange_strong(&channel->fsm, &expected_fsm, RMT_FSM_RUN_WAIT)) {
if (xQueueReceiveFromISR(tx_chan->trans_queues[RMT_TX_QUEUE_PROGRESS], &trans_desc, &awoken) == pdTRUE) {
// sanity check
assert(trans_desc);
atomic_store(&channel->fsm, RMT_FSM_RUN);
// begin a new transaction
rmt_tx_do_transaction(tx_chan, trans_desc);
if (awoken == pdTRUE) {
need_yield = true;
}
} else {
atomic_store(&channel->fsm, RMT_FSM_ENABLE);
}
}
}
if (awoken == pdTRUE) {
need_yield = true;
}
return need_yield;
}
#endif // SOC_RMT_SUPPORT_TX_LOOP_COUNT
static void IRAM_ATTR rmt_tx_default_isr(void *args)
{
rmt_tx_channel_t *tx_chan = (rmt_tx_channel_t *)args;
rmt_channel_t *channel = &tx_chan->base;
rmt_group_t *group = channel->group;
rmt_hal_context_t *hal = &group->hal;
uint32_t channel_id = channel->channel_id;
bool need_yield = false;
uint32_t status = rmt_ll_tx_get_interrupt_status(hal->regs, channel_id);
rmt_ll_clear_interrupt_status(hal->regs, status);
// Tx threshold interrupt
if (status & RMT_LL_EVENT_TX_THRES(channel_id)) {
if (rmt_isr_handle_tx_threshold(tx_chan)) {
need_yield = true;
}
}
// Tx end interrupt
if (status & RMT_LL_EVENT_TX_DONE(channel_id)) {
if (rmt_isr_handle_tx_done(tx_chan)) {
need_yield = true;
}
}
#if SOC_RMT_SUPPORT_TX_LOOP_COUNT
// Tx loop end interrupt
if (status & RMT_LL_EVENT_TX_LOOP_END(channel_id)) {
if (rmt_isr_handle_tx_loop_end(tx_chan)) {
need_yield = true;
}
}
#endif // SOC_RMT_SUPPORT_TX_LOOP_COUNT
if (need_yield) {
portYIELD_FROM_ISR();
}
}
#if SOC_RMT_SUPPORT_DMA
static bool IRAM_ATTR rmt_dma_tx_eof_cb(gdma_channel_handle_t dma_chan, gdma_event_data_t *event_data, void *user_data)
{
rmt_tx_channel_t *tx_chan = (rmt_tx_channel_t *)user_data;
dma_descriptor_t *eof_desc = (dma_descriptor_t *)event_data->tx_eof_desc_addr;
// if the DMA descriptor link is still a ring (i.e. hasn't broken down by `rmt_tx_mark_eof()`), then we treat it as a valid ping-pong event
if (eof_desc->next && eof_desc->next->next) {
// continue pingpong transmission
rmt_tx_trans_desc_t *t = tx_chan->cur_trans;
size_t encoded_symbols = t->transmitted_symbol_num;
if (t->flags.encoding_done) {
rmt_tx_mark_eof(tx_chan);
encoded_symbols += 1;
} else {
encoded_symbols += rmt_encode_check_result(tx_chan, t);
}
t->transmitted_symbol_num = encoded_symbols;
tx_chan->mem_end = tx_chan->ping_pong_symbols * 3 - tx_chan->mem_end; // mem_end equals to either ping_pong_symbols or ping_pong_symbols*2
// tell DMA that we have a new descriptor attached
gdma_append(dma_chan);
}
return false;
}
#endif // SOC_RMT_SUPPORT_DMA
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