How to Resolve Synchronization Issues in Multi-Threaded ESP32 FreeRTOS Application?
I am developing a multi-threaded ESP32 application using FreeRTOS to manage multiple sensor data streams (temperature, humidity, motion) and control signals. I face synchronization issues leading to race conditions and data corruption. Despite using mutexes and semaphores, the application behaves unpredictably under heavy load, with tasks occasionally accessing shared resources simultaneously, causing inconsistent data states and crashes. Specifically, I am seeing error messages like "Task watchdog got triggered" and "Guru Meditation Error: Core 0 panic'ed (LoadProhibited)" when tasks attempt to read sensor data concurrently. How can I diagnose and resolve these issues to maintain system reliability and performance?
Code:
// Example of using mutex for thread safety in FreeRTOS on ESP32
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <freertos/semphr.h>
#include "driver/gpio.h"
#define SENSOR_PIN GPIO_NUM_4
SemaphoreHandle_t Mutex;
void sensorTask(void *pvParameters) {
while (true) {
// Acquire the mutex before accessing the sensor
if (xSemaphoreTake(Mutex, portMAX_DELAY) == pdTRUE) {
int sensorValue = gpio_get_level(SENSOR_PIN);
// Process the sensor value
xSemaphoreGive(Mutex); // Release the mutex
}
vTaskDelay(pdMS_TO_TICKS(100)); // Delay to simulate periodic task
}
}
void app_main() {
Mutex = xSemaphoreCreateMutex();
if (Mutex != NULL) {
xTaskCreate(sensorTask, "Sensor Task", 2048, NULL, 5, NULL);
}
}
Code:
// Example of using mutex for thread safety in FreeRTOS on ESP32
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <freertos/semphr.h>
#include "driver/gpio.h"
#define SENSOR_PIN GPIO_NUM_4
SemaphoreHandle_t Mutex;
void sensorTask(void *pvParameters) {
while (true) {
// Acquire the mutex before accessing the sensor
if (xSemaphoreTake(Mutex, portMAX_DELAY) == pdTRUE) {
int sensorValue = gpio_get_level(SENSOR_PIN);
// Process the sensor value
xSemaphoreGive(Mutex); // Release the mutex
}
vTaskDelay(pdMS_TO_TICKS(100)); // Delay to simulate periodic task
}
}
void app_main() {
Mutex = xSemaphoreCreateMutex();
if (Mutex != NULL) {
xTaskCreate(sensorTask, "Sensor Task", 2048, NULL, 5, NULL);
}
}
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