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esp-idf/components/driver/parlio/parlio_tx.c

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/*
* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <string.h>
#include <stdatomic.h>
#include <sys/cdefs.h>
#include <sys/param.h>
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "freertos/idf_additions.h"
#if CONFIG_PARLIO_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_attr.h"
#include "esp_err.h"
#include "esp_rom_gpio.h"
#include "esp_intr_alloc.h"
#include "esp_pm.h"
#include "soc/parlio_periph.h"
#include "hal/parlio_ll.h"
#include "hal/gpio_hal.h"
#include "driver/gpio.h"
#include "driver/parlio_tx.h"
#include "parlio_private.h"
#include "esp_memory_utils.h"
#include "esp_clk_tree.h"
#include "esp_private/gdma.h"
static const char *TAG = "parlio-tx";
typedef struct {
uint32_t idle_value; // Parallel IO bus idle value
const void *payload; // payload to be transmitted
size_t payload_bits; // payload size in bits
} parlio_tx_trans_desc_t;
typedef struct parlio_tx_unit_t {
int unit_id; // unit id
parlio_dir_t dir;
parlio_group_t *group; // group handle
size_t data_width; // data width
intr_handle_t intr; // allocated interrupt handle
esp_pm_lock_handle_t pm_lock; // power management lock
gdma_channel_handle_t dma_chan; // DMA channel
#if CONFIG_PM_ENABLE
char pm_lock_name[PARLIO_PM_LOCK_NAME_LEN_MAX]; // pm lock name
#endif
portMUX_TYPE spinlock; // prevent resource accessing by user and interrupt concurrently
uint32_t out_clk_freq_hz; // output clock frequency
size_t max_transfer_bits; // maximum transfer size in bits
size_t queue_depth; // size of transaction queue
size_t num_trans_inflight; // indicates the number of transactions that are undergoing but not recycled to ready_queue
QueueHandle_t trans_queues[PARLIO_TX_QUEUE_MAX]; // transaction queues
parlio_tx_trans_desc_t *cur_trans; // points to current transaction
uint32_t idle_value_mask; // mask of idle value
_Atomic parlio_tx_fsm_t fsm; // Driver FSM state
parlio_tx_done_callback_t on_trans_done; // callback function when the transmission is done
void *user_data; // user data passed to the callback function
parlio_dma_desc_t *dma_nodes; // DMA descriptor nodes
parlio_tx_trans_desc_t trans_desc_pool[]; // transaction descriptor pool
} parlio_tx_unit_t;
static void parlio_tx_default_isr(void *args);
static esp_err_t parlio_tx_create_trans_queue(parlio_tx_unit_t *tx_unit, const parlio_tx_unit_config_t *config)
{
esp_err_t ret;
tx_unit->queue_depth = config->trans_queue_depth;
// Allocate transaction queues. Each queue only holds pointers to the transaction descriptors
for (int i = 0; i < PARLIO_TX_QUEUE_MAX; i++) {
tx_unit->trans_queues[i] = xQueueCreateWithCaps(config->trans_queue_depth, sizeof(parlio_tx_trans_desc_t *), PARLIO_MEM_ALLOC_CAPS);
ESP_GOTO_ON_FALSE(tx_unit->trans_queues[i], ESP_ERR_NO_MEM, exit, TAG, "no mem for queue");
}
// Initialize the ready queue
parlio_tx_trans_desc_t *p_trans_desc = NULL;
for (int i = 0; i < config->trans_queue_depth; i++) {
p_trans_desc = &tx_unit->trans_desc_pool[i];
ESP_GOTO_ON_FALSE(xQueueSend(tx_unit->trans_queues[PARLIO_TX_QUEUE_READY], &p_trans_desc, 0) == pdTRUE,
ESP_ERR_INVALID_STATE, exit, TAG, "ready queue full");
}
return ESP_OK;
exit:
for (int i = 0; i < PARLIO_TX_QUEUE_MAX; i++) {
if (tx_unit->trans_queues[i]) {
vQueueDeleteWithCaps(tx_unit->trans_queues[i]);
tx_unit->trans_queues[i] = NULL;
}
}
return ret;
}
static esp_err_t parlio_destroy_tx_unit(parlio_tx_unit_t *tx_unit)
{
if (tx_unit->intr) {
ESP_RETURN_ON_ERROR(esp_intr_free(tx_unit->intr), TAG, "delete interrupt service failed");
}
if (tx_unit->pm_lock) {
ESP_RETURN_ON_ERROR(esp_pm_lock_delete(tx_unit->pm_lock), TAG, "delete pm lock failed");
}
if (tx_unit->dma_chan) {
ESP_RETURN_ON_ERROR(gdma_disconnect(tx_unit->dma_chan), TAG, "disconnect dma channel failed");
ESP_RETURN_ON_ERROR(gdma_del_channel(tx_unit->dma_chan), TAG, "delete dma channel failed");
}
for (int i = 0; i < PARLIO_TX_QUEUE_MAX; i++) {
if (tx_unit->trans_queues[i]) {
vQueueDeleteWithCaps(tx_unit->trans_queues[i]);
}
}
if (tx_unit->group) {
// de-register from group
parlio_unregister_unit_from_group((parlio_unit_base_handle_t)tx_unit);
}
free(tx_unit->dma_nodes);
free(tx_unit);
return ESP_OK;
}
static esp_err_t parlio_tx_unit_configure_gpio(parlio_tx_unit_t *tx_unit, const parlio_tx_unit_config_t *config)
{
int group_id = tx_unit->group->group_id;
int unit_id = tx_unit->unit_id;
gpio_config_t gpio_conf = {
.intr_type = GPIO_INTR_DISABLE,
.mode = config->flags.io_loop_back ? GPIO_MODE_INPUT_OUTPUT : GPIO_MODE_OUTPUT,
.pull_down_en = false,
.pull_up_en = true,
};
// connect peripheral signals via GPIO matrix
for (size_t i = 0; i < config->data_width; i++) {
if (config->data_gpio_nums[i] >= 0) {
gpio_conf.pin_bit_mask = BIT64(config->data_gpio_nums[i]);
ESP_RETURN_ON_ERROR(gpio_config(&gpio_conf), TAG, "config data GPIO failed");
esp_rom_gpio_connect_out_signal(config->data_gpio_nums[i],
parlio_periph_signals.groups[group_id].tx_units[unit_id].data_sigs[i], false, false);
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[config->data_gpio_nums[i]], PIN_FUNC_GPIO);
}
}
// Note: the valid signal will override TXD[PARLIO_LL_TX_DATA_LINE_AS_VALID_SIG]
if (config->valid_gpio_num >= 0) {
gpio_conf.pin_bit_mask = BIT64(config->valid_gpio_num);
ESP_RETURN_ON_ERROR(gpio_config(&gpio_conf), TAG, "config valid GPIO failed");
esp_rom_gpio_connect_out_signal(config->valid_gpio_num,
parlio_periph_signals.groups[group_id].tx_units[unit_id].data_sigs[PARLIO_LL_TX_DATA_LINE_AS_VALID_SIG],
false, false);
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[config->valid_gpio_num], PIN_FUNC_GPIO);
}
if (config->clk_out_gpio_num >= 0) {
gpio_conf.pin_bit_mask = BIT64(config->clk_out_gpio_num);
ESP_RETURN_ON_ERROR(gpio_config(&gpio_conf), TAG, "config clk out GPIO failed");
esp_rom_gpio_connect_out_signal(config->clk_out_gpio_num,
parlio_periph_signals.groups[group_id].tx_units[unit_id].clk_out_sig, false, false);
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[config->clk_out_gpio_num], PIN_FUNC_GPIO);
}
if (config->clk_in_gpio_num >= 0) {
gpio_conf.mode = config->flags.io_loop_back ? GPIO_MODE_INPUT_OUTPUT : GPIO_MODE_INPUT;
gpio_conf.pin_bit_mask = BIT64(config->clk_in_gpio_num);
ESP_RETURN_ON_ERROR(gpio_config(&gpio_conf), TAG, "config clk in GPIO failed");
esp_rom_gpio_connect_in_signal(config->clk_in_gpio_num,
parlio_periph_signals.groups[group_id].tx_units[unit_id].clk_in_sig, false);
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[config->clk_in_gpio_num], PIN_FUNC_GPIO);
}
return ESP_OK;
}
static esp_err_t parlio_tx_unit_init_dma(parlio_tx_unit_t *tx_unit)
{
gdma_channel_alloc_config_t dma_chan_config = {
.direction = GDMA_CHANNEL_DIRECTION_TX,
};
ESP_RETURN_ON_ERROR(PARLIO_GDMA_NEW_CHANNEL(&dma_chan_config, &tx_unit->dma_chan), TAG, "allocate TX DMA channel failed");
gdma_connect(tx_unit->dma_chan, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_PARLIO, 0));
gdma_strategy_config_t gdma_strategy_conf = {
.auto_update_desc = true,
.owner_check = true,
};
gdma_apply_strategy(tx_unit->dma_chan, &gdma_strategy_conf);
return ESP_OK;
}
static esp_err_t parlio_select_periph_clock(parlio_tx_unit_t *tx_unit, const parlio_tx_unit_config_t *config)
{
parlio_hal_context_t *hal = &tx_unit->group->hal;
parlio_clock_source_t clk_src = config->clk_in_gpio_num >= 0 ? PARLIO_CLK_SRC_EXTERNAL : config->clk_src;
uint32_t periph_src_clk_hz = 0;
// if the source clock is input from the GPIO, then we're in the slave mode
if (clk_src == PARLIO_CLK_SRC_EXTERNAL) {
periph_src_clk_hz = config->input_clk_src_freq_hz;
} else {
// get the internal clock source frequency
esp_clk_tree_src_get_freq_hz((soc_module_clk_t)clk_src, ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED, &periph_src_clk_hz);
}
ESP_RETURN_ON_FALSE(periph_src_clk_hz, ESP_ERR_INVALID_ARG, TAG, "invalid clock source frequency");
#if CONFIG_PM_ENABLE
if (clk_src != PARLIO_CLK_SRC_EXTERNAL) {
// XTAL and PLL clock source will be turned off in light sleep, so we need to create a NO_LIGHT_SLEEP lock
sprintf(tx_unit->pm_lock_name, "parlio_tx_%d_%d", tx_unit->group->group_id, tx_unit->unit_id); // e.g. parlio_tx_0_0
esp_err_t ret = esp_pm_lock_create(ESP_PM_NO_LIGHT_SLEEP, 0, tx_unit->pm_lock_name, &tx_unit->pm_lock);
ESP_RETURN_ON_ERROR(ret, TAG, "create NO_LIGHT_SLEEP lock failed");
}
#endif
hal_utils_clk_div_t clk_div = {};
hal_utils_clk_info_t clk_info = {
.src_freq_hz = periph_src_clk_hz,
.exp_freq_hz = config->output_clk_freq_hz,
.max_integ = PARLIO_LL_TX_MAX_CLK_INT_DIV,
.min_integ = 1,
.round_opt = HAL_DIV_ROUND,
};
#if PARLIO_LL_TX_MAX_CLK_FRACT_DIV
clk_info.max_fract = PARLIO_LL_TX_MAX_CLK_FRACT_DIV;
tx_unit->out_clk_freq_hz = hal_utils_calc_clk_div_frac_accurate(&clk_info, &clk_div);
#else
tx_unit->out_clk_freq_hz = hal_utils_calc_clk_div_integer(&clk_info, &clk_div.integer);
#endif
PARLIO_CLOCK_SRC_ATOMIC() {
parlio_ll_tx_set_clock_source(hal->regs, clk_src);
// set clock division
parlio_ll_tx_set_clock_div(hal->regs, &clk_div);
}
// precision lost due to division
if (tx_unit->out_clk_freq_hz != config->output_clk_freq_hz) {
ESP_LOGW(TAG, "precision loss, real output frequency: %"PRIu32, tx_unit->out_clk_freq_hz);
}
return ESP_OK;
}
esp_err_t parlio_new_tx_unit(const parlio_tx_unit_config_t *config, parlio_tx_unit_handle_t *ret_unit)
{
#if CONFIG_PARLIO_ENABLE_DEBUG_LOG
esp_log_level_set(TAG, ESP_LOG_DEBUG);
#endif
esp_err_t ret = ESP_OK;
parlio_tx_unit_t *unit = NULL;
ESP_GOTO_ON_FALSE(config && ret_unit, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
size_t data_width = config->data_width;
// data_width must be power of 2 and less than or equal to SOC_PARLIO_TX_UNIT_MAX_DATA_WIDTH
ESP_GOTO_ON_FALSE(data_width && (data_width <= SOC_PARLIO_TX_UNIT_MAX_DATA_WIDTH) && ((data_width & (data_width - 1)) == 0),
ESP_ERR_INVALID_ARG, err, TAG, "invalid data width");
// data_width must not conflict with the valid signal
ESP_GOTO_ON_FALSE(!(config->valid_gpio_num >= 0 && data_width > PARLIO_LL_TX_DATA_LINE_AS_VALID_SIG),
ESP_ERR_INVALID_ARG, err, TAG, "valid signal conflicts with data signal");
ESP_GOTO_ON_FALSE(config->max_transfer_size && config->max_transfer_size <= PARLIO_LL_TX_MAX_BITS_PER_FRAME / 8,
ESP_ERR_INVALID_ARG, err, TAG, "invalid max transfer size");
#if SOC_PARLIO_TX_CLK_SUPPORT_GATING
// clock gating is controlled by either the MSB bit of data bus or the valid signal
ESP_GOTO_ON_FALSE(!(config->flags.clk_gate_en && config->valid_gpio_num < 0 && config->data_width <= PARLIO_LL_TX_DATA_LINE_AS_CLK_GATE),
ESP_ERR_INVALID_ARG, err, TAG, "no gpio can control the clock gating");
#else
ESP_GOTO_ON_FALSE(config->flags.clk_gate_en == 0, ESP_ERR_NOT_SUPPORTED, err, TAG, "clock gating is not supported");
#endif // SOC_PARLIO_TX_CLK_SUPPORT_GATING
// malloc unit memory
unit = heap_caps_calloc(1, sizeof(parlio_tx_unit_t) + sizeof(parlio_tx_trans_desc_t) * config->trans_queue_depth, PARLIO_MEM_ALLOC_CAPS);
ESP_GOTO_ON_FALSE(unit, ESP_ERR_NO_MEM, err, TAG, "no memory for tx unit");
size_t dma_nodes_num = config->max_transfer_size / DMA_DESCRIPTOR_BUFFER_MAX_SIZE + 1;
// DMA descriptors must be placed in internal SRAM
unit->dma_nodes = heap_caps_aligned_calloc(PARLIO_DMA_DESC_ALIGNMENT, dma_nodes_num, sizeof(parlio_dma_desc_t), MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA);
ESP_GOTO_ON_FALSE(unit->dma_nodes, ESP_ERR_NO_MEM, err, TAG, "no memory for DMA nodes");
// Link the descriptors
for (int i = 0; i < dma_nodes_num; i++) {
unit->dma_nodes[i].next = (i == dma_nodes_num - 1) ? NULL : &(unit->dma_nodes[i+1]);
}
unit->max_transfer_bits = config->max_transfer_size * 8;
unit->dir = PARLIO_DIR_TX;
unit->data_width = data_width;
//create transaction queue
ESP_GOTO_ON_ERROR(parlio_tx_create_trans_queue(unit, config), err, TAG, "create transaction queue failed");
// register the unit to a group
ESP_GOTO_ON_ERROR(parlio_register_unit_to_group((parlio_unit_base_handle_t)unit), err, TAG, "register unit to group failed");
parlio_group_t *group = unit->group;
parlio_hal_context_t *hal = &group->hal;
// select the clock source
ESP_GOTO_ON_ERROR(parlio_select_periph_clock(unit, config), err, TAG, "set clock source failed");
// install interrupt service
int isr_flags = PARLIO_INTR_ALLOC_FLAG;
ret = esp_intr_alloc_intrstatus(parlio_periph_signals.groups[group->group_id].tx_irq_id, isr_flags,
(uint32_t)parlio_ll_get_interrupt_status_reg(hal->regs),
PARLIO_LL_EVENT_TX_EOF, parlio_tx_default_isr, unit, &unit->intr);
ESP_GOTO_ON_ERROR(ret, err, TAG, "install interrupt failed");
// install DMA service
ESP_GOTO_ON_ERROR(parlio_tx_unit_init_dma(unit), err, TAG, "install tx DMA failed");
// reset fifo and core clock domain
PARLIO_RCC_ATOMIC() {
parlio_ll_tx_reset_clock(hal->regs);
}
parlio_ll_tx_reset_fifo(hal->regs);
PARLIO_CLOCK_SRC_ATOMIC() {
// stop output clock
parlio_ll_tx_enable_clock(hal->regs, false);
}
// clock gating
parlio_ll_tx_enable_clock_gating(hal->regs, config->flags.clk_gate_en);
// set data width
parlio_ll_tx_set_bus_width(hal->regs, data_width);
unit->idle_value_mask = (1 << data_width) - 1;
// whether to use the valid signal
if (config->valid_gpio_num >= 0) {
parlio_ll_tx_treat_msb_as_valid(hal->regs, true);
unit->idle_value_mask &= ~(1 << PARLIO_LL_TX_DATA_LINE_AS_VALID_SIG);
} else {
parlio_ll_tx_treat_msb_as_valid(hal->regs, false);
}
// set data byte packing order
if (data_width < 8) {
parlio_ll_tx_set_bit_pack_order(hal->regs, config->bit_pack_order);
}
// set sample clock edge
parlio_ll_tx_set_sample_clock_edge(hal->regs, config->sample_edge);
#if SOC_PARLIO_TX_SIZE_BY_DMA
// Always use DMA EOF as the Parlio TX EOF
parlio_ll_tx_set_eof_condition(hal->regs, PARLIO_LL_TX_EOF_COND_DMA_EOF);
#endif // SOC_PARLIO_TX_SIZE_BY_DMA
// clear any pending interrupt
parlio_ll_clear_interrupt_status(hal->regs, PARLIO_LL_EVENT_TX_MASK);
// GPIO Matrix/MUX configuration
ESP_GOTO_ON_ERROR(parlio_tx_unit_configure_gpio(unit, config), err, TAG, "configure gpio failed");
portMUX_INITIALIZE(&unit->spinlock);
atomic_init(&unit->fsm, PARLIO_TX_FSM_INIT);
// return TX unit handle
*ret_unit = unit;
ESP_LOGD(TAG, "new tx unit(%d,%d) at %p, out clk=%"PRIu32"Hz, queue_depth=%zu, idle_mask=%"PRIx32,
group->group_id, unit->unit_id, unit, unit->out_clk_freq_hz, unit->queue_depth, unit->idle_value_mask);
return ESP_OK;
err:
if (unit) {
parlio_destroy_tx_unit(unit);
}
return ret;
}
esp_err_t parlio_del_tx_unit(parlio_tx_unit_handle_t unit)
{
ESP_RETURN_ON_FALSE(unit, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
ESP_RETURN_ON_FALSE(atomic_load(&unit->fsm) == PARLIO_TX_FSM_INIT, ESP_ERR_INVALID_STATE, TAG, "unit not in init state");
ESP_LOGD(TAG, "del tx unit(%d,%d)", unit->group->group_id, unit->unit_id);
return parlio_destroy_tx_unit(unit);
}
static void IRAM_ATTR parlio_tx_mount_dma_data(parlio_dma_desc_t *desc_head, const void *buffer, size_t len)
{
size_t prepared_length = 0;
uint8_t *data = (uint8_t *)buffer;
parlio_dma_desc_t *desc = desc_head;
while (len) {
parlio_dma_desc_t *non_cache_desc = PARLIO_GET_NON_CACHED_DESC_ADDR(desc);
uint32_t mount_bytes = len > DMA_DESCRIPTOR_BUFFER_MAX_SIZE ? DMA_DESCRIPTOR_BUFFER_MAX_SIZE : len;
len -= mount_bytes;
non_cache_desc->dw0.suc_eof = len == 0; // whether the last frame
non_cache_desc->dw0.size = mount_bytes;
non_cache_desc->dw0.length = mount_bytes;
non_cache_desc->dw0.owner = DMA_DESCRIPTOR_BUFFER_OWNER_DMA;
non_cache_desc->buffer = &data[prepared_length];
desc = desc->next; // move to next descriptor
prepared_length += mount_bytes;
}
#if CONFIG_IDF_TARGET_ESP32P4
// Write back to cache to synchronize the cache before DMA start
Cache_WriteBack_Addr(CACHE_MAP_L1_DCACHE, (uint32_t)buffer, len);
#endif // CONFIG_IDF_TARGET_ESP32P4
}
esp_err_t parlio_tx_unit_wait_all_done(parlio_tx_unit_handle_t tx_unit, int timeout_ms)
{
ESP_RETURN_ON_FALSE(tx_unit, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
TickType_t wait_ticks = timeout_ms < 0 ? portMAX_DELAY : pdMS_TO_TICKS(timeout_ms);
// recycle all pending transactions
parlio_tx_trans_desc_t *t = NULL;
size_t num_trans_inflight = tx_unit->num_trans_inflight;
for (size_t i = 0; i < num_trans_inflight; i++) {
ESP_RETURN_ON_FALSE(xQueueReceive(tx_unit->trans_queues[PARLIO_TX_QUEUE_COMPLETE], &t, wait_ticks) == pdTRUE,
ESP_ERR_TIMEOUT, TAG, "flush timeout");
ESP_RETURN_ON_FALSE(xQueueSend(tx_unit->trans_queues[PARLIO_TX_QUEUE_READY], &t, 0) == pdTRUE,
ESP_ERR_INVALID_STATE, TAG, "ready queue full");
tx_unit->num_trans_inflight--;
}
return ESP_OK;
}
esp_err_t parlio_tx_unit_register_event_callbacks(parlio_tx_unit_handle_t tx_unit, const parlio_tx_event_callbacks_t *cbs, void *user_data)
{
ESP_RETURN_ON_FALSE(tx_unit && cbs, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
#if CONFIG_PARLIO_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_unit->on_trans_done = cbs->on_trans_done;
tx_unit->user_data = user_data;
return ESP_OK;
}
static void IRAM_ATTR parlio_tx_do_transaction(parlio_tx_unit_t *tx_unit, parlio_tx_trans_desc_t *t)
{
parlio_hal_context_t *hal = &tx_unit->group->hal;
tx_unit->cur_trans = t;
// DMA transfer data based on bytes not bits, so convert the bit length to bytes, round up
parlio_tx_mount_dma_data(tx_unit->dma_nodes, t->payload, (t->payload_bits + 7) / 8);
parlio_ll_tx_reset_fifo(hal->regs);
PARLIO_RCC_ATOMIC() {
parlio_ll_tx_reset_clock(hal->regs);
}
parlio_ll_tx_set_idle_data_value(hal->regs, t->idle_value);
parlio_ll_tx_set_trans_bit_len(hal->regs, t->payload_bits);
gdma_start(tx_unit->dma_chan, (intptr_t)tx_unit->dma_nodes);
// wait until the data goes from the DMA to TX unit's FIFO
while (parlio_ll_tx_is_ready(hal->regs) == false);
// turn on the core clock after we start the TX unit
parlio_ll_tx_start(hal->regs, true);
PARLIO_CLOCK_SRC_ATOMIC() {
parlio_ll_tx_enable_clock(hal->regs, true);
}
}
esp_err_t parlio_tx_unit_enable(parlio_tx_unit_handle_t tx_unit)
{
ESP_RETURN_ON_FALSE(tx_unit, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
parlio_tx_fsm_t expected_fsm = PARLIO_TX_FSM_INIT;
if (atomic_compare_exchange_strong(&tx_unit->fsm, &expected_fsm, PARLIO_TX_FSM_ENABLE_WAIT)) {
// acquire power management lock
if (tx_unit->pm_lock) {
esp_pm_lock_acquire(tx_unit->pm_lock);
}
parlio_hal_context_t *hal = &tx_unit->group->hal;
parlio_ll_enable_interrupt(hal->regs, PARLIO_LL_EVENT_TX_EOF, true);
atomic_store(&tx_unit->fsm, PARLIO_TX_FSM_ENABLE);
} else {
ESP_RETURN_ON_FALSE(false, ESP_ERR_INVALID_STATE, TAG, "unit not in init state");
}
// check if we need to start one pending transaction
parlio_tx_trans_desc_t *t = NULL;
expected_fsm = PARLIO_TX_FSM_ENABLE;
if (atomic_compare_exchange_strong(&tx_unit->fsm, &expected_fsm, PARLIO_TX_FSM_RUN_WAIT)) {
// check if we need to start one transaction
if (xQueueReceive(tx_unit->trans_queues[PARLIO_TX_QUEUE_PROGRESS], &t, 0) == pdTRUE) {
// sanity check
assert(t);
atomic_store(&tx_unit->fsm, PARLIO_TX_FSM_RUN);
parlio_tx_do_transaction(tx_unit, t);
} else {
atomic_store(&tx_unit->fsm, PARLIO_TX_FSM_ENABLE);
}
}
return ESP_OK;
}
esp_err_t parlio_tx_unit_disable(parlio_tx_unit_handle_t tx_unit)
{
ESP_RETURN_ON_FALSE(tx_unit, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
bool valid_state = false;
// check the supported states, and switch to intermediate state: INIT_WAIT
parlio_tx_fsm_t expected_fsm = PARLIO_TX_FSM_ENABLE;
if (atomic_compare_exchange_strong(&tx_unit->fsm, &expected_fsm, PARLIO_TX_FSM_INIT_WAIT)) {
valid_state = true;
}
expected_fsm = PARLIO_TX_FSM_RUN;
if (atomic_compare_exchange_strong(&tx_unit->fsm, &expected_fsm, PARLIO_TX_FSM_INIT_WAIT)) {
valid_state = true;
assert(tx_unit->cur_trans);
// recycle the interrupted transaction
if (xQueueSend(tx_unit->trans_queues[PARLIO_TX_QUEUE_COMPLETE], &tx_unit->cur_trans, 0) == pdFALSE) {
// this should never happen
valid_state = false;
}
tx_unit->cur_trans = NULL;
}
ESP_RETURN_ON_FALSE(valid_state, ESP_ERR_INVALID_STATE, TAG, "unit can't be disabled in state %d", expected_fsm);
// stop the TX engine
parlio_hal_context_t *hal = &tx_unit->group->hal;
gdma_stop(tx_unit->dma_chan);
parlio_ll_tx_start(hal->regs, false);
parlio_ll_enable_interrupt(hal->regs, PARLIO_LL_EVENT_TX_EOF, false);
// release power management lock
if (tx_unit->pm_lock) {
esp_pm_lock_release(tx_unit->pm_lock);
}
// finally we switch to the INIT state
atomic_store(&tx_unit->fsm, PARLIO_TX_FSM_INIT);
return ESP_OK;
}
esp_err_t parlio_tx_unit_transmit(parlio_tx_unit_handle_t tx_unit, const void *payload, size_t payload_bits, const parlio_transmit_config_t *config)
{
ESP_RETURN_ON_FALSE(tx_unit && payload && payload_bits, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
ESP_RETURN_ON_FALSE((payload_bits % tx_unit->data_width) == 0, ESP_ERR_INVALID_ARG, TAG, "payload bit length must align to bus width");
ESP_RETURN_ON_FALSE(payload_bits <= tx_unit->max_transfer_bits, ESP_ERR_INVALID_ARG, TAG, "payload bit length too large");
#if !SOC_PARLIO_TRANS_BIT_ALIGN
ESP_RETURN_ON_FALSE((payload_bits % 8) == 0, ESP_ERR_INVALID_ARG, TAG, "payload bit length must be multiple of 8");
#endif // !SOC_PARLIO_TRANS_BIT_ALIGN
// acquire one transaction description from ready queue or complete queue
parlio_tx_trans_desc_t *t = NULL;
if (xQueueReceive(tx_unit->trans_queues[PARLIO_TX_QUEUE_READY], &t, 0) != pdTRUE) {
if (xQueueReceive(tx_unit->trans_queues[PARLIO_TX_QUEUE_COMPLETE], &t, 0) == pdTRUE) {
tx_unit->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(parlio_tx_trans_desc_t));
t->payload = payload;
t->payload_bits = payload_bits;
t->idle_value = config->idle_value & tx_unit->idle_value_mask;
// send the transaction descriptor to progress queue
ESP_RETURN_ON_FALSE(xQueueSend(tx_unit->trans_queues[PARLIO_TX_QUEUE_PROGRESS], &t, 0) == pdTRUE,
ESP_ERR_INVALID_STATE, TAG, "failed to send transaction descriptor to progress queue");
tx_unit->num_trans_inflight++;
// check if we need to start one pending transaction
parlio_tx_fsm_t expected_fsm = PARLIO_TX_FSM_ENABLE;
if (atomic_compare_exchange_strong(&tx_unit->fsm, &expected_fsm, PARLIO_TX_FSM_RUN_WAIT)) {
// check if we need to start one transaction
if (xQueueReceive(tx_unit->trans_queues[PARLIO_TX_QUEUE_PROGRESS], &t, 0) == pdTRUE) {
atomic_store(&tx_unit->fsm, PARLIO_TX_FSM_RUN);
parlio_tx_do_transaction(tx_unit, t);
} else {
atomic_store(&tx_unit->fsm, PARLIO_TX_FSM_ENABLE);
}
}
return ESP_OK;
}
static void IRAM_ATTR parlio_tx_default_isr(void *args)
{
parlio_tx_unit_t *tx_unit = (parlio_tx_unit_t *)args;
parlio_group_t *group = tx_unit->group;
parlio_hal_context_t *hal = &group->hal;
BaseType_t high_task_woken = pdFALSE;
bool need_yield = false;
uint32_t status = parlio_ll_tx_get_interrupt_status(hal->regs);
if (status & PARLIO_LL_EVENT_TX_EOF) {
parlio_ll_clear_interrupt_status(hal->regs, PARLIO_LL_EVENT_TX_EOF);
PARLIO_CLOCK_SRC_ATOMIC() {
parlio_ll_tx_enable_clock(hal->regs, false);
}
parlio_ll_tx_start(hal->regs, false);
parlio_tx_trans_desc_t *trans_desc = NULL;
parlio_tx_fsm_t expected_fsm = PARLIO_TX_FSM_RUN;
if (atomic_compare_exchange_strong(&tx_unit->fsm, &expected_fsm, PARLIO_TX_FSM_ENABLE_WAIT)) {
trans_desc = tx_unit->cur_trans;
// move current finished transaction to the complete queue
xQueueSendFromISR(tx_unit->trans_queues[PARLIO_TX_QUEUE_COMPLETE], &trans_desc, &high_task_woken);
if (high_task_woken == pdTRUE) {
need_yield = true;
}
tx_unit->cur_trans = NULL;
atomic_store(&tx_unit->fsm, PARLIO_TX_FSM_ENABLE);
}
// invoke callback
parlio_tx_done_callback_t done_cb = tx_unit->on_trans_done;
if (done_cb) {
if (done_cb(tx_unit, NULL, tx_unit->user_data)) {
need_yield = true;
}
}
// if the tx unit is till in enable state (i.e. not disabled by user), let's try start the next pending transaction
expected_fsm = PARLIO_TX_FSM_ENABLE;
if (atomic_compare_exchange_strong(&tx_unit->fsm, &expected_fsm, PARLIO_TX_FSM_RUN_WAIT)) {
if (xQueueReceiveFromISR(tx_unit->trans_queues[PARLIO_TX_QUEUE_PROGRESS], &trans_desc, &high_task_woken) == pdTRUE) {
// sanity check
assert(trans_desc);
atomic_store(&tx_unit->fsm, PARLIO_TX_FSM_RUN);
parlio_tx_do_transaction(tx_unit, trans_desc);
if (high_task_woken == pdTRUE) {
need_yield = true;
}
} else {
atomic_store(&tx_unit->fsm, PARLIO_TX_FSM_ENABLE);
}
}
if (need_yield) {
portYIELD_FROM_ISR();
}
}
}
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