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esp-idf/components/driver/twai.c
Darian Leung f3a8a911c0 twai: Add errata workaround for listen only mode 
This commit adds a workaround for the TWAI listen only mode errata which is
present on the ESP32, ESP32-S2, ESP32-S3, and ESP32-C3. twai_get_status_info()
has also been updated to account for the fact that TEC/REC are frozen in
listen only mode.

Errata Description:

When the TWAI controller is put into listen only mode, it should not influence
the TWAI bus in any way (i.e., should never send a dominant bit). However,
on the targets listed above, the TWAI controller will send dominant bits in an
error frame (i.e., active error frame), even if the controller is set to listen
only mode.

Workaround:

We can force the TWAI controller into the error passive state on startup (by
setting the REC to >= 128). Since the TEC/REC are frozen in listen only mode,
the TWAI controller will remain error passive and only send recessive bits
(i.e., passive error frames), thus will not influence the TWAI bus.

Closes https://github.com/espressif/esp-idf/issues/9157
2023-02-24 20:38:37 +08:00

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// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "freertos/semphr.h"
#include "esp_types.h"
#include "esp_log.h"
#include "esp_intr_alloc.h"
#include "esp_pm.h"
#include "esp_attr.h"
#include "esp_heap_caps.h"
#include "driver/gpio.h"
#include "driver/periph_ctrl.h"
#include "driver/twai.h"
#include "soc/soc_caps.h"
#include "soc/twai_periph.h"
#include "hal/twai_hal.h"
/* ---------------------------- Definitions --------------------------------- */
//Internal Macros
#define TWAI_CHECK(cond, ret_val) ({ \
if (!(cond)) { \
return (ret_val); \
} \
})
#define TWAI_CHECK_FROM_CRIT(cond, ret_val) ({ \
if (!(cond)) { \
TWAI_EXIT_CRITICAL(); \
return ret_val; \
} \
})
#define TWAI_SET_FLAG(var, mask) ((var) |= (mask))
#define TWAI_RESET_FLAG(var, mask) ((var) &= ~(mask))
#ifdef CONFIG_TWAI_ISR_IN_IRAM
#define TWAI_ISR_ATTR IRAM_ATTR
#define TWAI_MALLOC_CAPS (MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT)
#else
#define TWAI_TAG "TWAI"
#define TWAI_ISR_ATTR
#define TWAI_MALLOC_CAPS MALLOC_CAP_DEFAULT
#endif //CONFIG_TWAI_ISR_IN_IRAM
#define DRIVER_DEFAULT_INTERRUPTS 0xE7 //Exclude data overrun (bit[3]) and brp_div (bit[4])
#define ALERT_LOG_LEVEL_WARNING TWAI_ALERT_ARB_LOST //Alerts above and including this level use ESP_LOGW
#define ALERT_LOG_LEVEL_ERROR TWAI_ALERT_TX_FAILED //Alerts above and including this level use ESP_LOGE
/* ------------------ Typedefs, structures, and variables ------------------- */
//Control structure for TWAI driver
typedef struct {
//Control and status members
twai_state_t state;
twai_mode_t mode;
uint32_t rx_missed_count;
uint32_t rx_overrun_count;
uint32_t tx_failed_count;
uint32_t arb_lost_count;
uint32_t bus_error_count;
intr_handle_t isr_handle;
//TX and RX
#ifdef CONFIG_TWAI_ISR_IN_IRAM
void *tx_queue_buff;
void *tx_queue_struct;
void *rx_queue_buff;
void *rx_queue_struct;
void *semphr_struct;
#endif
QueueHandle_t tx_queue;
QueueHandle_t rx_queue;
int tx_msg_count;
int rx_msg_count;
//Alerts
SemaphoreHandle_t alert_semphr;
uint32_t alerts_enabled;
uint32_t alerts_triggered;
#ifdef CONFIG_PM_ENABLE
//Power Management
esp_pm_lock_handle_t pm_lock;
#endif
} twai_obj_t;
static twai_obj_t *p_twai_obj = NULL;
static portMUX_TYPE twai_spinlock = portMUX_INITIALIZER_UNLOCKED;
#define TWAI_ENTER_CRITICAL_ISR() portENTER_CRITICAL_ISR(&twai_spinlock)
#define TWAI_EXIT_CRITICAL_ISR() portEXIT_CRITICAL_ISR(&twai_spinlock)
#define TWAI_ENTER_CRITICAL() portENTER_CRITICAL(&twai_spinlock)
#define TWAI_EXIT_CRITICAL() portEXIT_CRITICAL(&twai_spinlock)
static twai_hal_context_t twai_context;
/* -------------------- Interrupt and Alert Handlers ------------------------ */
TWAI_ISR_ATTR static void twai_alert_handler(uint32_t alert_code, int *alert_req)
{
if (p_twai_obj->alerts_enabled & alert_code) {
//Signify alert has occurred
TWAI_SET_FLAG(p_twai_obj->alerts_triggered, alert_code);
*alert_req = 1;
#ifndef CONFIG_TWAI_ISR_IN_IRAM //Only log if ISR is not in IRAM
if (p_twai_obj->alerts_enabled & TWAI_ALERT_AND_LOG) {
if (alert_code >= ALERT_LOG_LEVEL_ERROR) {
ESP_EARLY_LOGE(TWAI_TAG, "Alert %d", alert_code);
} else if (alert_code >= ALERT_LOG_LEVEL_WARNING) {
ESP_EARLY_LOGW(TWAI_TAG, "Alert %d", alert_code);
} else {
ESP_EARLY_LOGI(TWAI_TAG, "Alert %d", alert_code);
}
}
#endif //CONFIG_TWAI_ISR_IN_IRAM
}
}
static inline void twai_handle_rx_buffer_frames(BaseType_t *task_woken, int *alert_req)
{
#ifdef TWAI_SUPPORTS_RX_STATUS
uint32_t msg_count = twai_hal_get_rx_msg_count(&twai_context);
for (uint32_t i = 0; i < msg_count; i++) {
twai_hal_frame_t frame;
if (twai_hal_read_rx_buffer_and_clear(&twai_context, &frame)) {
//Valid frame copied from RX buffer
if (xQueueSendFromISR(p_twai_obj->rx_queue, &frame, task_woken) == pdTRUE) {
p_twai_obj->rx_msg_count++;
} else { //Failed to send to queue
p_twai_obj->rx_missed_count++;
twai_alert_handler(TWAI_ALERT_RX_QUEUE_FULL, alert_req);
}
} else { //Failed to read from RX buffer because message is overrun
p_twai_obj->rx_overrun_count++;
twai_alert_handler(TWAI_ALERT_RX_FIFO_OVERRUN, alert_req);
}
}
#else //TWAI_SUPPORTS_RX_STATUS
uint32_t msg_count = twai_hal_get_rx_msg_count(&twai_context);
bool overrun = false;
//Clear all valid RX frames
for (int i = 0; i < msg_count; i++) {
twai_hal_frame_t frame;
if (twai_hal_read_rx_buffer_and_clear(&twai_context, &frame)) {
//Valid frame copied from RX buffer
if (xQueueSendFromISR(p_twai_obj->rx_queue, &frame, task_woken) == pdTRUE) {
p_twai_obj->rx_msg_count++;
} else {
p_twai_obj->rx_missed_count++;
twai_alert_handler(TWAI_ALERT_RX_QUEUE_FULL, alert_req);
}
} else {
overrun = true;
break;
}
}
//All remaining frames are treated as overrun. Clear them all
if (overrun) {
p_twai_obj->rx_overrun_count += twai_hal_clear_rx_fifo_overrun(&twai_context);
twai_alert_handler(TWAI_ALERT_RX_FIFO_OVERRUN, alert_req);
}
#endif //TWAI_SUPPORTS_RX_STATUS
}
static inline void twai_handle_tx_buffer_frame(BaseType_t *task_woken, int *alert_req)
{
//Handle previously transmitted frame
if (twai_hal_check_last_tx_successful(&twai_context)) {
twai_alert_handler(TWAI_ALERT_TX_SUCCESS, alert_req);
} else {
p_twai_obj->tx_failed_count++;
twai_alert_handler(TWAI_ALERT_TX_FAILED, alert_req);
}
//Update TX message count
p_twai_obj->tx_msg_count--;
assert(p_twai_obj->tx_msg_count >= 0); //Sanity check
//Check if there are more frames to transmit
if (p_twai_obj->tx_msg_count > 0 && p_twai_obj->tx_queue != NULL) {
twai_hal_frame_t frame;
int res = xQueueReceiveFromISR(p_twai_obj->tx_queue, &frame, task_woken);
if (res == pdTRUE) {
twai_hal_set_tx_buffer_and_transmit(&twai_context, &frame);
} else {
assert(false && "failed to get a frame from TX queue");
}
} else {
//No more frames to transmit
twai_alert_handler(TWAI_ALERT_TX_IDLE, alert_req);
}
}
TWAI_ISR_ATTR static void twai_intr_handler_main(void *arg)
{
BaseType_t task_woken = pdFALSE;
int alert_req = 0;
uint32_t events;
TWAI_ENTER_CRITICAL_ISR();
if (p_twai_obj == NULL) { //In case intr occurs whilst driver is being uninstalled
TWAI_EXIT_CRITICAL_ISR();
return;
}
events = twai_hal_get_events(&twai_context); //Get the events that triggered the interrupt
#if defined(CONFIG_TWAI_ERRATA_FIX_RX_FRAME_INVALID) || defined(CONFIG_TWAI_ERRATA_FIX_RX_FIFO_CORRUPT)
if (events & TWAI_HAL_EVENT_NEED_PERIPH_RESET) {
twai_hal_prepare_for_reset(&twai_context);
periph_module_reset(PERIPH_TWAI_MODULE);
twai_hal_recover_from_reset(&twai_context);
p_twai_obj->rx_missed_count += twai_hal_get_reset_lost_rx_cnt(&twai_context);
twai_alert_handler(TWAI_ALERT_PERIPH_RESET, &alert_req);
}
#endif
if (events & TWAI_HAL_EVENT_RX_BUFF_FRAME) {
//Note: This event will never occur if there is a periph reset event
twai_handle_rx_buffer_frames(&task_woken, &alert_req);
}
if (events & TWAI_HAL_EVENT_TX_BUFF_FREE) {
twai_handle_tx_buffer_frame(&task_woken, &alert_req);
}
//Handle events that only require alerting (i.e. no handler)
if (events & TWAI_HAL_EVENT_BUS_OFF) {
p_twai_obj->state = TWAI_STATE_BUS_OFF;
twai_alert_handler(TWAI_ALERT_BUS_OFF, &alert_req);
}
if (events & TWAI_HAL_EVENT_BUS_RECOV_CPLT) {
p_twai_obj->state = TWAI_STATE_STOPPED;
twai_alert_handler(TWAI_ALERT_BUS_RECOVERED, &alert_req);
}
if (events & TWAI_HAL_EVENT_BUS_ERR) {
p_twai_obj->bus_error_count++;
twai_alert_handler(TWAI_ALERT_BUS_ERROR, &alert_req);
}
if (events & TWAI_HAL_EVENT_ARB_LOST) {
p_twai_obj->arb_lost_count++;
twai_alert_handler(TWAI_ALERT_ARB_LOST, &alert_req);
}
if (events & TWAI_HAL_EVENT_BUS_RECOV_PROGRESS) {
//Bus-recovery in progress. TEC has dropped below error warning limit
twai_alert_handler(TWAI_ALERT_RECOVERY_IN_PROGRESS, &alert_req);
}
if (events & TWAI_HAL_EVENT_ERROR_PASSIVE) {
//Entered error passive
twai_alert_handler(TWAI_ALERT_ERR_PASS, &alert_req);
}
if (events & TWAI_HAL_EVENT_ERROR_ACTIVE) {
//Returned to error active
twai_alert_handler(TWAI_ALERT_ERR_ACTIVE, &alert_req);
}
if (events & TWAI_HAL_EVENT_ABOVE_EWL) {
//TEC or REC surpassed error warning limit
twai_alert_handler(TWAI_ALERT_ABOVE_ERR_WARN, &alert_req);
}
if (events & TWAI_HAL_EVENT_BELOW_EWL) {
//TEC and REC are both below error warning
twai_alert_handler(TWAI_ALERT_BELOW_ERR_WARN, &alert_req);
}
TWAI_EXIT_CRITICAL_ISR();
if (p_twai_obj->alert_semphr != NULL && alert_req) {
//Give semaphore if alerts were triggered
xSemaphoreGiveFromISR(p_twai_obj->alert_semphr, &task_woken);
}
if (task_woken == pdTRUE) {
portYIELD_FROM_ISR();
}
}
/* -------------------------- Helper functions ----------------------------- */
static void twai_configure_gpio(gpio_num_t tx, gpio_num_t rx, gpio_num_t clkout, gpio_num_t bus_status)
{
//Set TX pin
gpio_set_pull_mode(tx, GPIO_FLOATING);
gpio_matrix_out(tx, TWAI_TX_IDX, false, false);
gpio_pad_select_gpio(tx);
//Set RX pin
gpio_set_pull_mode(rx, GPIO_FLOATING);
gpio_matrix_in(rx, TWAI_RX_IDX, false);
gpio_pad_select_gpio(rx);
gpio_set_direction(rx, GPIO_MODE_INPUT);
//Configure output clock pin (Optional)
if (clkout >= 0 && clkout < GPIO_NUM_MAX) {
gpio_set_pull_mode(clkout, GPIO_FLOATING);
gpio_matrix_out(clkout, TWAI_CLKOUT_IDX, false, false);
gpio_pad_select_gpio(clkout);
}
//Configure bus status pin (Optional)
if (bus_status >= 0 && bus_status < GPIO_NUM_MAX) {
gpio_set_pull_mode(bus_status, GPIO_FLOATING);
gpio_matrix_out(bus_status, TWAI_BUS_OFF_ON_IDX, false, false);
gpio_pad_select_gpio(bus_status);
}
}
static void twai_free_driver_obj(twai_obj_t *p_obj)
{
//Free driver object and any dependent SW resources it uses (queues, semaphores etc)
#ifdef CONFIG_PM_ENABLE
if (p_obj->pm_lock != NULL) {
ESP_ERROR_CHECK(esp_pm_lock_delete(p_obj->pm_lock));
}
#endif
//Delete queues and semaphores
if (p_obj->tx_queue != NULL) {
vQueueDelete(p_obj->tx_queue);
}
if (p_obj->rx_queue != NULL) {
vQueueDelete(p_obj->rx_queue);
}
if (p_obj->alert_semphr != NULL) {
vSemaphoreDelete(p_obj->alert_semphr);
}
#ifdef CONFIG_TWAI_ISR_IN_IRAM
//Free memory used by static queues and semaphores. free() allows freeing NULL pointers
free(p_obj->tx_queue_buff);
free(p_obj->tx_queue_struct);
free(p_obj->rx_queue_buff);
free(p_obj->rx_queue_struct);
free(p_obj->semphr_struct);
#endif //CONFIG_TWAI_ISR_IN_IRAM
free(p_obj);
}
static twai_obj_t *twai_alloc_driver_obj(uint32_t tx_queue_len, uint32_t rx_queue_len)
{
//Allocates driver object and any dependent SW resources it uses (queues, semaphores etc)
//Create a TWAI driver object
twai_obj_t *p_obj = heap_caps_calloc(1, sizeof(twai_obj_t), TWAI_MALLOC_CAPS);
if (p_obj == NULL) {
return NULL;
}
#ifdef CONFIG_TWAI_ISR_IN_IRAM
//Allocate memory for queues and semaphores in DRAM
if (tx_queue_len > 0) {
p_obj->tx_queue_buff = heap_caps_calloc(tx_queue_len, sizeof(twai_hal_frame_t), TWAI_MALLOC_CAPS);
p_obj->tx_queue_struct = heap_caps_calloc(1, sizeof(StaticQueue_t), TWAI_MALLOC_CAPS);
if (p_obj->tx_queue_buff == NULL || p_obj->tx_queue_struct == NULL) {
goto cleanup;
}
}
p_obj->rx_queue_buff = heap_caps_calloc(rx_queue_len, sizeof(twai_hal_frame_t), TWAI_MALLOC_CAPS);
p_obj->rx_queue_struct = heap_caps_calloc(1, sizeof(StaticQueue_t), TWAI_MALLOC_CAPS);
p_obj->semphr_struct = heap_caps_calloc(1, sizeof(StaticSemaphore_t), TWAI_MALLOC_CAPS);
if (p_obj->rx_queue_buff == NULL || p_obj->rx_queue_struct == NULL || p_obj->semphr_struct == NULL) {
goto cleanup;
}
//Create static queues and semaphores
if (tx_queue_len > 0) {
p_obj->tx_queue = xQueueCreateStatic(tx_queue_len, sizeof(twai_hal_frame_t), p_obj->tx_queue_buff, p_obj->tx_queue_struct);
if (p_obj->tx_queue == NULL) {
goto cleanup;
}
}
p_obj->rx_queue = xQueueCreateStatic(rx_queue_len, sizeof(twai_hal_frame_t), p_obj->rx_queue_buff, p_obj->rx_queue_struct);
p_obj->alert_semphr = xSemaphoreCreateBinaryStatic(p_obj->semphr_struct);
if (p_obj->rx_queue == NULL || p_obj->alert_semphr == NULL) {
goto cleanup;
}
#else //CONFIG_TWAI_ISR_IN_IRAM
if (tx_queue_len > 0) {
p_obj->tx_queue = xQueueCreate(tx_queue_len, sizeof(twai_hal_frame_t));
}
p_obj->rx_queue = xQueueCreate(rx_queue_len, sizeof(twai_hal_frame_t));
p_obj->alert_semphr = xSemaphoreCreateBinary();
if ((tx_queue_len > 0 && p_obj->tx_queue == NULL) || p_obj->rx_queue == NULL || p_obj->alert_semphr == NULL) {
goto cleanup;
}
#endif //CONFIG_TWAI_ISR_IN_IRAM
#ifdef CONFIG_PM_ENABLE
esp_err_t pm_err = esp_pm_lock_create(ESP_PM_APB_FREQ_MAX, 0, "twai", &(p_obj->pm_lock));
if (pm_err != ESP_OK ) {
goto cleanup;
}
#endif
return p_obj;
cleanup:
twai_free_driver_obj(p_obj);
return NULL;
}
/* ---------------------------- Public Functions ---------------------------- */
esp_err_t twai_driver_install(const twai_general_config_t *g_config, const twai_timing_config_t *t_config, const twai_filter_config_t *f_config)
{
//Check arguments
TWAI_CHECK(g_config != NULL, ESP_ERR_INVALID_ARG);
TWAI_CHECK(t_config != NULL, ESP_ERR_INVALID_ARG);
TWAI_CHECK(f_config != NULL, ESP_ERR_INVALID_ARG);
TWAI_CHECK(g_config->rx_queue_len > 0, ESP_ERR_INVALID_ARG);
TWAI_CHECK(g_config->tx_io >= 0 && g_config->tx_io < GPIO_NUM_MAX, ESP_ERR_INVALID_ARG);
TWAI_CHECK(g_config->rx_io >= 0 && g_config->rx_io < GPIO_NUM_MAX, ESP_ERR_INVALID_ARG);
#if (CONFIG_ESP32_REV_MIN >= 2)
TWAI_CHECK(t_config->brp >= TWAI_BRP_MIN && t_config->brp <= TWAI_BRP_MAX_ECO, ESP_ERR_INVALID_ARG);
#else
TWAI_CHECK(t_config->brp >= TWAI_BRP_MIN && t_config->brp <= TWAI_BRP_MAX, ESP_ERR_INVALID_ARG);
#endif
#ifndef CONFIG_TWAI_ISR_IN_IRAM
TWAI_CHECK(!(g_config->intr_flags & ESP_INTR_FLAG_IRAM), ESP_ERR_INVALID_ARG);
#endif
TWAI_ENTER_CRITICAL();
TWAI_CHECK_FROM_CRIT(p_twai_obj == NULL, ESP_ERR_INVALID_STATE);
TWAI_EXIT_CRITICAL();
esp_err_t ret;
twai_obj_t *p_twai_obj_dummy;
//Create a TWAI object (including queues and semaphores)
p_twai_obj_dummy = twai_alloc_driver_obj(g_config->tx_queue_len, g_config->rx_queue_len);
TWAI_CHECK(p_twai_obj_dummy != NULL, ESP_ERR_NO_MEM);
//Initialize flags and variables. All other members are already set to zero by twai_alloc_driver_obj()
p_twai_obj_dummy->state = TWAI_STATE_STOPPED;
p_twai_obj_dummy->mode = g_config->mode;
p_twai_obj_dummy->alerts_enabled = g_config->alerts_enabled;
//Initialize TWAI peripheral registers, and allocate interrupt
TWAI_ENTER_CRITICAL();
if (p_twai_obj == NULL) {
p_twai_obj = p_twai_obj_dummy;
} else {
//Check if driver is already installed
TWAI_EXIT_CRITICAL();
ret = ESP_ERR_INVALID_STATE;
goto err;
}
periph_module_reset(PERIPH_TWAI_MODULE);
periph_module_enable(PERIPH_TWAI_MODULE); //Enable APB CLK to TWAI peripheral
bool init = twai_hal_init(&twai_context);
assert(init);
twai_hal_configure(&twai_context, t_config, f_config, DRIVER_DEFAULT_INTERRUPTS, g_config->clkout_divider);
TWAI_EXIT_CRITICAL();
//Allocate GPIO and Interrupts
twai_configure_gpio(g_config->tx_io, g_config->rx_io, g_config->clkout_io, g_config->bus_off_io);
ESP_ERROR_CHECK(esp_intr_alloc(ETS_TWAI_INTR_SOURCE, g_config->intr_flags, twai_intr_handler_main, NULL, &p_twai_obj->isr_handle));
#ifdef CONFIG_PM_ENABLE
ESP_ERROR_CHECK(esp_pm_lock_acquire(p_twai_obj->pm_lock)); //Acquire pm_lock to keep APB clock at 80MHz
#endif
return ESP_OK; //TWAI module is still in reset mode, users need to call twai_start() afterwards
err:
twai_free_driver_obj(p_twai_obj_dummy);
return ret;
}
esp_err_t twai_driver_uninstall(void)
{
twai_obj_t *p_twai_obj_dummy;
TWAI_ENTER_CRITICAL();
//Check state
TWAI_CHECK_FROM_CRIT(p_twai_obj != NULL, ESP_ERR_INVALID_STATE);
TWAI_CHECK_FROM_CRIT(p_twai_obj->state == TWAI_STATE_STOPPED || p_twai_obj->state == TWAI_STATE_BUS_OFF, ESP_ERR_INVALID_STATE);
//Clear registers by reading
twai_hal_deinit(&twai_context);
periph_module_disable(PERIPH_TWAI_MODULE); //Disable TWAI peripheral
p_twai_obj_dummy = p_twai_obj; //Use dummy to shorten critical section
p_twai_obj = NULL;
TWAI_EXIT_CRITICAL();
ESP_ERROR_CHECK(esp_intr_free(p_twai_obj_dummy->isr_handle)); //Free interrupt
#ifdef CONFIG_PM_ENABLE
//Release and delete power management lock
ESP_ERROR_CHECK(esp_pm_lock_release(p_twai_obj_dummy->pm_lock));
#endif
//Free can driver object
twai_free_driver_obj(p_twai_obj_dummy);
return ESP_OK;
}
esp_err_t twai_start(void)
{
//Check state
TWAI_ENTER_CRITICAL();
TWAI_CHECK_FROM_CRIT(p_twai_obj != NULL, ESP_ERR_INVALID_STATE);
TWAI_CHECK_FROM_CRIT(p_twai_obj->state == TWAI_STATE_STOPPED, ESP_ERR_INVALID_STATE);
//Reset RX queue, RX message count, amd TX queue
xQueueReset(p_twai_obj->rx_queue);
if (p_twai_obj->tx_queue != NULL) {
xQueueReset(p_twai_obj->tx_queue);
}
p_twai_obj->rx_msg_count = 0;
p_twai_obj->tx_msg_count = 0;
twai_hal_start(&twai_context, p_twai_obj->mode);
p_twai_obj->state = TWAI_STATE_RUNNING;
TWAI_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t twai_stop(void)
{
//Check state
TWAI_ENTER_CRITICAL();
TWAI_CHECK_FROM_CRIT(p_twai_obj != NULL, ESP_ERR_INVALID_STATE);
TWAI_CHECK_FROM_CRIT(p_twai_obj->state == TWAI_STATE_RUNNING, ESP_ERR_INVALID_STATE);
twai_hal_stop(&twai_context);
//Reset TX Queue and message count
if (p_twai_obj->tx_queue != NULL) {
xQueueReset(p_twai_obj->tx_queue);
}
p_twai_obj->tx_msg_count = 0;
p_twai_obj->state = TWAI_STATE_STOPPED;
TWAI_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t twai_transmit(const twai_message_t *message, TickType_t ticks_to_wait)
{
//Check arguments
TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE);
TWAI_CHECK(message != NULL, ESP_ERR_INVALID_ARG);
TWAI_CHECK((message->data_length_code <= TWAI_FRAME_MAX_DLC) || message->dlc_non_comp, ESP_ERR_INVALID_ARG);
TWAI_ENTER_CRITICAL();
//Check State
TWAI_CHECK_FROM_CRIT(!(p_twai_obj->mode == TWAI_MODE_LISTEN_ONLY), ESP_ERR_NOT_SUPPORTED);
TWAI_CHECK_FROM_CRIT(p_twai_obj->state == TWAI_STATE_RUNNING, ESP_ERR_INVALID_STATE);
//Format frame
esp_err_t ret = ESP_FAIL;
twai_hal_frame_t tx_frame;
twai_hal_format_frame(message, &tx_frame);
//Check if frame can be sent immediately
if (p_twai_obj->tx_msg_count == 0) {
//No other frames waiting to transmit. Bypass queue and transmit immediately
twai_hal_set_tx_buffer_and_transmit(&twai_context, &tx_frame);
p_twai_obj->tx_msg_count++;
ret = ESP_OK;
}
TWAI_EXIT_CRITICAL();
if (ret != ESP_OK) {
if (p_twai_obj->tx_queue == NULL) {
//TX Queue is disabled and TX buffer is occupied, message was not sent
ret = ESP_FAIL;
} else if (xQueueSend(p_twai_obj->tx_queue, &tx_frame, ticks_to_wait) == pdTRUE) {
//Copied to TX Queue
TWAI_ENTER_CRITICAL();
if ((!twai_hal_check_state_flags(&twai_context, TWAI_HAL_STATE_FLAG_TX_BUFF_OCCUPIED)) && uxQueueMessagesWaiting(p_twai_obj->tx_queue) > 0) {
//If the TX buffer is free but the TX queue is not empty. Check if we need to manually start a transmission
if (twai_hal_check_state_flags(&twai_context, TWAI_HAL_STATE_FLAG_BUS_OFF) || !twai_hal_check_state_flags(&twai_context, TWAI_HAL_STATE_FLAG_RUNNING)) {
//TX buffer became free due to bus-off or is no longer running. No need to start a transmission
ret = ESP_ERR_INVALID_STATE;
} else {
//Manually start a transmission
int res = xQueueReceive(p_twai_obj->tx_queue, &tx_frame, 0);
assert(res == pdTRUE);
twai_hal_set_tx_buffer_and_transmit(&twai_context, &tx_frame);
p_twai_obj->tx_msg_count++;
ret = ESP_OK;
}
} else {
//Frame was copied to queue, waiting to be transmitted
p_twai_obj->tx_msg_count++;
ret = ESP_OK;
}
TWAI_EXIT_CRITICAL();
} else {
//Timed out waiting for free space on TX queue
ret = ESP_ERR_TIMEOUT;
}
}
return ret;
}
esp_err_t twai_receive(twai_message_t *message, TickType_t ticks_to_wait)
{
//Check arguments and state
TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE);
TWAI_CHECK(message != NULL, ESP_ERR_INVALID_ARG);
//Get frame from RX Queue or RX Buffer
twai_hal_frame_t rx_frame;
if (xQueueReceive(p_twai_obj->rx_queue, &rx_frame, ticks_to_wait) != pdTRUE) {
return ESP_ERR_TIMEOUT;
}
TWAI_ENTER_CRITICAL();
p_twai_obj->rx_msg_count--;
TWAI_EXIT_CRITICAL();
//Decode frame
twai_hal_parse_frame(&rx_frame, message);
return ESP_OK;
}
esp_err_t twai_read_alerts(uint32_t *alerts, TickType_t ticks_to_wait)
{
//Check arguments and state
TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE);
TWAI_CHECK(alerts != NULL, ESP_ERR_INVALID_ARG);
//Wait for an alert to occur
if (xSemaphoreTake(p_twai_obj->alert_semphr, ticks_to_wait) == pdTRUE) {
TWAI_ENTER_CRITICAL();
*alerts = p_twai_obj->alerts_triggered;
p_twai_obj->alerts_triggered = 0; //Clear triggered alerts
TWAI_EXIT_CRITICAL();
return ESP_OK;
} else {
*alerts = 0;
return ESP_ERR_TIMEOUT;
}
}
esp_err_t twai_reconfigure_alerts(uint32_t alerts_enabled, uint32_t *current_alerts)
{
TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE);
TWAI_ENTER_CRITICAL();
//Clear any unhandled alerts
if (current_alerts != NULL) {
*current_alerts = p_twai_obj->alerts_triggered;;
}
p_twai_obj->alerts_triggered = 0;
p_twai_obj->alerts_enabled = alerts_enabled; //Update enabled alerts
TWAI_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t twai_initiate_recovery(void)
{
TWAI_ENTER_CRITICAL();
//Check state
TWAI_CHECK_FROM_CRIT(p_twai_obj != NULL, ESP_ERR_INVALID_STATE);
TWAI_CHECK_FROM_CRIT(p_twai_obj->state == TWAI_STATE_BUS_OFF, ESP_ERR_INVALID_STATE);
//Reset TX Queue/Counters
if (p_twai_obj->tx_queue != NULL) {
xQueueReset(p_twai_obj->tx_queue);
}
p_twai_obj->tx_msg_count = 0;
//Trigger start of recovery process
twai_hal_start_bus_recovery(&twai_context);
p_twai_obj->state = TWAI_STATE_RECOVERING;
TWAI_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t twai_get_status_info(twai_status_info_t *status_info)
{
//Check parameters and state
TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE);
TWAI_CHECK(status_info != NULL, ESP_ERR_INVALID_ARG);
TWAI_ENTER_CRITICAL();
if (p_twai_obj->mode == TWAI_MODE_LISTEN_ONLY) {
//Error counters are frozen under listen only mode thus are meaningless. Simply return 0 in this case.
status_info->tx_error_counter = 0;
status_info->rx_error_counter = 0;
} else {
status_info->tx_error_counter = twai_hal_get_tec(&twai_context);
status_info->rx_error_counter = twai_hal_get_rec(&twai_context);
}
status_info->msgs_to_tx = p_twai_obj->tx_msg_count;
status_info->msgs_to_rx = p_twai_obj->rx_msg_count;
status_info->tx_failed_count = p_twai_obj->tx_failed_count;
status_info->rx_missed_count = p_twai_obj->rx_missed_count;
status_info->rx_overrun_count = p_twai_obj->rx_overrun_count;
status_info->arb_lost_count = p_twai_obj->arb_lost_count;
status_info->bus_error_count = p_twai_obj->bus_error_count;
status_info->state = p_twai_obj->state;
TWAI_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t twai_clear_transmit_queue(void)
{
//Check State
TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE);
TWAI_CHECK(p_twai_obj->tx_queue != NULL, ESP_ERR_NOT_SUPPORTED);
TWAI_ENTER_CRITICAL();
//If a message is currently undergoing transmission, the tx interrupt handler will decrement tx_msg_count
p_twai_obj->tx_msg_count = twai_hal_check_state_flags(&twai_context, TWAI_HAL_STATE_FLAG_TX_BUFF_OCCUPIED) ? 1 : 0;
xQueueReset(p_twai_obj->tx_queue);
TWAI_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t twai_clear_receive_queue(void)
{
//Check State
TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE);
TWAI_ENTER_CRITICAL();
p_twai_obj->rx_msg_count = 0;
xQueueReset(p_twai_obj->rx_queue);
TWAI_EXIT_CRITICAL();
return ESP_OK;
}
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