fix: timer cb incorrect return

README.md

@@ -1,13 +1,25 @@
-# ESP32 ESP-IDF component for AC dimmer
+# ESP32 ESP-IDF component for AC dimmer 115V/400Hz
 
 ## Tested on
 
 1. [ESP32 ESP-IDF v5.5.1](https://docs.espressif.com/projects/esp-idf/en/v5.5.1/esp32/index.html)
 
-## Features
+## SAST Tools
 
-1. Supports frequency up to 400 Hz.
-2. Automatic frequency detection.
+[PVS-Studio](https://pvs-studio.com/pvs-studio/?utm_source=website&utm_medium=github&utm_campaign=open_source) - static analyzer for C, C++, C#, and Java code.
+
+## Attention
+
+1. Supports frequency 400Hz only.
+2. For correct operation, please enable the following settings in the menuconfig:
+
+```text
+GPIO_CTRL_FUNC_IN_IRAM
+CONFIG_GPTIMER_ISR_HANDLER_IN_IRAM
+CONFIG_GPTIMER_CTRL_FUNC_IN_IRAM
+CONFIG_GPTIMER_ISR_CACHE_SAFE
+CONFIG_GPTIMER_OBJ_CACHE_SAFE
+```
 
 ## Using
 
@@ -37,18 +49,22 @@ void app_main(void)
     config.triac_gpio = GPIO_NUM_17;
     zh_ac_dimmer_init(&config);
     zh_ac_dimmer_start();
-    for (;;)
-    {
+    uint8_t value = 0;
     for (uint8_t i = 0; i <= 100; ++i)
     {
         zh_ac_dimmer_set(i);
+        zh_ac_dimmer_get(&value);
+        printf("Dimmer value: %d.\n", value);
         vTaskDelay(100 / portTICK_PERIOD_MS);
     }
     for (uint8_t i = 100; i > 0; --i)
     {
         zh_ac_dimmer_set(i);
+        zh_ac_dimmer_get(&value);
+        printf("Dimmer value: %d.\n", value);
         vTaskDelay(100 / portTICK_PERIOD_MS);
     }
-    }
+    zh_ac_dimmer_stop();
+    zh_ac_dimmer_deinit();
 }
 ```

include/zh_ac_dimmer.h

@@ -1,3 +1,7 @@
+/**
+ * @file zh_ac_dimmer.h
+ */
+
 #pragma once
 
 #include "freertos/FreeRTOS.h"
@@ -7,21 +11,26 @@
 #include "esp_log.h"
 #include "driver/gpio.h"
 
+/**
+ * @brief AC dimmer initial default values.
+ */
 #define ZH_AC_DIMMER_INIT_CONFIG_DEFAULT() \
     {                                      \
         .zero_cross_gpio = GPIO_NUM_MAX,   \
         .triac_gpio = GPIO_NUM_MAX}
 
 #ifdef __cplusplus
-
 extern "C"
 {
 #endif
 
-    typedef struct // Structure for initial initialization of AC dimmer.
+    /**
+     * @brief Structure for initial initialization of AC dimmer.
+     */
+    typedef struct
     {
-        uint8_t zero_cross_gpio; // Zero cross GPIO.
-        uint8_t triac_gpio;      // Triac GPIO.
+        uint8_t zero_cross_gpio; /*!< Zero cross GPIO. */
+        uint8_t triac_gpio;      /*!< Triac GPIO. */
     } zh_ac_dimmer_init_config_t;
 
     /**
@@ -37,6 +46,13 @@ extern "C"
      */
     esp_err_t zh_ac_dimmer_init(const zh_ac_dimmer_init_config_t *config);
 
+    /**
+     * @brief Deinitialize AC dimmer.
+     *
+     * @return ESP_OK if success or an error code otherwise.
+     */
+    esp_err_t zh_ac_dimmer_deinit(void);
+
     /**
      * @brief Start AC dimmer.
      *
@@ -60,6 +76,15 @@ extern "C"
      */
     esp_err_t zh_ac_dimmer_set(uint8_t value);
 
+    /**
+     * @brief Get AC dimmer dimming value.
+     *
+     * @param[out] value Pointer to dimming value.
+     *
+     * @return ESP_OK if success or an error code otherwise.
+     */
+    esp_err_t zh_ac_dimmer_get(uint8_t *value);
+
 #ifdef __cplusplus
 }
 #endif

version.txt

@@ -1 +1 @@
-v1.0.0
+2.0.1

zh_ac_dimmer.c

@@ -5,10 +5,11 @@ static const char *TAG = "zh_ac_dimmer";
 #define ZH_LOGI(msg, ...) ESP_LOGI(TAG, msg, ##__VA_ARGS__)
 #define ZH_LOGE(msg, err, ...) ESP_LOGE(TAG, "[%s:%d:%s] " msg, __FILE__, __LINE__, esp_err_to_name(err), ##__VA_ARGS__)
 
-#define ZH_ERROR_CHECK(cond, err, msg, ...) \
+#define ZH_ERROR_CHECK(cond, err, cleanup, msg, ...) \
     if (!(cond))                                     \
     {                                                \
-        ZH_LOGE(msg, err);                  \
+        ZH_LOGE(msg, err, ##__VA_ARGS__);            \
+        cleanup;                                     \
         return err;                                  \
     }
 
@@ -16,43 +17,68 @@ static gptimer_handle_t _dimmer_timer = NULL;
 static gptimer_alarm_config_t _alarm_config = {0};
 
 static zh_ac_dimmer_init_config_t _init_config = {0};
-static uint64_t _prev_micros = 0;
-static uint32_t _current_frequency = 0;
-static uint32_t _prev_frequency = 0;
-static uint16_t _zero_cross_time = 0;
-static uint8_t _dimmer_value = 0;
-static bool _is_dimmer_work = false;
+static volatile uint64_t _prev_us = 0;
+static volatile uint8_t _dimmer_value = 0;
+static volatile bool _is_dimmer_work = false;
 static bool _is_initialized = false;
+static bool _is_prev_gpio_isr_handler = false;
 
 static esp_err_t _zh_ac_dimmer_validate_config(const zh_ac_dimmer_init_config_t *config);
 static esp_err_t _zh_ac_dimmer_gpio_init(const zh_ac_dimmer_init_config_t *config);
-static esp_err_t _zh_ac_dimmer_interrupt_init(const zh_ac_dimmer_init_config_t *config);
 static esp_err_t _zh_ac_dimmer_timer_init(void);
 static void _zh_ac_dimmer_isr_handler(void *arg);
 static bool _zh_ac_dimmer_timer_on_alarm_cb(gptimer_handle_t timer, const gptimer_alarm_event_data_t *edata, void *user_ctx);
 
-esp_err_t zh_ac_dimmer_init(const zh_ac_dimmer_init_config_t *config)
+esp_err_t zh_ac_dimmer_init(const zh_ac_dimmer_init_config_t *config) // -V2008
 {
     ZH_LOGI("AC dimmer initialization started.");
-    ZH_ERROR_CHECK(_is_initialized == false, ESP_ERR_INVALID_STATE, "AC dimmer initialization failed. AC dimmer is already initialized.");
+    ZH_ERROR_CHECK(_is_initialized == false, ESP_ERR_INVALID_STATE, NULL, "AC dimmer initialization failed. AC dimmer is already initialized.");
     esp_err_t err = _zh_ac_dimmer_validate_config(config);
-    ZH_ERROR_CHECK(err == ESP_OK, err, "AC dimmer initialization failed. Initial configuration check failed.");
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "AC dimmer initialization failed. Initial configuration check failed.");
     err = _zh_ac_dimmer_gpio_init(config);
-    ZH_ERROR_CHECK(err == ESP_OK, err, "AC dimmer initialization failed. GPIO initialization failed.");
-    err = _zh_ac_dimmer_interrupt_init(config);
-    ZH_ERROR_CHECK(err == ESP_OK, err, "AC dimmer initialization failed. Interrupt initialization failed.");
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "AC dimmer initialization failed. GPIO initialization failed.");
     err = _zh_ac_dimmer_timer_init();
-    ZH_ERROR_CHECK(err == ESP_OK, err, "AC dimmer initialization failed. Timer initialization failed.");
+    if (_is_prev_gpio_isr_handler == true)
+    {
+        ZH_ERROR_CHECK(err == ESP_OK, err, gpio_isr_handler_remove((gpio_num_t)config->zero_cross_gpio); gpio_reset_pin((gpio_num_t)config->triac_gpio); gpio_reset_pin((gpio_num_t)config->zero_cross_gpio), "AC dimmer initialization failed. Timer initialization failed.");
+    }
+    else
+    {
+        ZH_ERROR_CHECK(err == ESP_OK, err, gpio_isr_handler_remove((gpio_num_t)config->zero_cross_gpio); gpio_uninstall_isr_service(); gpio_reset_pin((gpio_num_t)config->triac_gpio); gpio_reset_pin((gpio_num_t)config->zero_cross_gpio), "AC dimmer initialization failed. Timer initialization failed.");
+    }
     _init_config = *config;
     _is_initialized = true;
     ZH_LOGI("AC dimmer initialization completed successfully.");
     return ESP_OK;
 }
 
+esp_err_t zh_ac_dimmer_deinit(void)
+{
+    ZH_LOGI("AC dimmer deinitialization started.");
+    ZH_ERROR_CHECK(_is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "AC dimmer deinitialization failed. AC dimmer is not initialized.");
+    gptimer_stop(_dimmer_timer);
+    gptimer_disable(_dimmer_timer);
+    gptimer_del_timer(_dimmer_timer);
+    gpio_isr_handler_remove((gpio_num_t)_init_config.zero_cross_gpio);
+    if (_is_prev_gpio_isr_handler == false)
+    {
+        gpio_uninstall_isr_service();
+    }
+    gpio_reset_pin((gpio_num_t)_init_config.triac_gpio);
+    gpio_reset_pin((gpio_num_t)_init_config.zero_cross_gpio);
+    _is_dimmer_work = false;
+    _is_initialized = false;
+    _dimmer_timer = NULL;
+    _dimmer_value = 0;
+    _prev_us = 0;
+    ZH_LOGI("AC dimmer deinitialization completed successfully.");
+    return ESP_OK;
+}
+
 esp_err_t zh_ac_dimmer_start(void)
 {
     ZH_LOGI("AC dimmer start begin.");
-    ZH_ERROR_CHECK(_is_initialized == true, ESP_ERR_INVALID_STATE, "AC dimmer start failed. AC dimmer is not initialized.");
+    ZH_ERROR_CHECK(_is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "AC dimmer start failed. AC dimmer is not initialized.");
     _is_dimmer_work = true;
     ZH_LOGI("AC dimmer start completed successfully.");
     return ESP_OK;
@@ -61,7 +87,7 @@ esp_err_t zh_ac_dimmer_start(void)
 esp_err_t zh_ac_dimmer_stop(void)
 {
     ZH_LOGI("AC dimmer stop begin.");
-    ZH_ERROR_CHECK(_is_initialized == true, ESP_ERR_INVALID_STATE, "AC dimmer stop failed. AC dimmer is not initialized.");
+    ZH_ERROR_CHECK(_is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "AC dimmer stop failed. AC dimmer is not initialized.");
     _is_dimmer_work = false;
     ZH_LOGI("AC dimmer stop completed successfully.");
     return ESP_OK;
@@ -70,23 +96,33 @@ esp_err_t zh_ac_dimmer_stop(void)
 esp_err_t zh_ac_dimmer_set(uint8_t value)
 {
     ZH_LOGI("AC dimmer setup begin.");
-    ZH_ERROR_CHECK(_is_initialized == true, ESP_ERR_INVALID_STATE, "AC dimmer stop failed. AC dimmer is not initialized.");
-    ZH_ERROR_CHECK(value <= 100, ESP_ERR_INVALID_ARG, "AC dimmer setup failed. Dimming value invalid.");
+    ZH_ERROR_CHECK(_is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "AC dimmer setup failed. AC dimmer is not initialized.");
+    ZH_ERROR_CHECK(value <= 100, ESP_ERR_INVALID_ARG, NULL, "AC dimmer setup failed. Dimming value invalid.");
     _dimmer_value = value;
     ZH_LOGI("AC dimmer setup completed successfully.");
     return ESP_OK;
 }
 
-esp_err_t _zh_ac_dimmer_validate_config(const zh_ac_dimmer_init_config_t *config)
+esp_err_t zh_ac_dimmer_get(uint8_t *value)
 {
-    ZH_ERROR_CHECK(config != NULL, ESP_ERR_INVALID_ARG, "Initial config is NULL.");
-    ZH_ERROR_CHECK((config->zero_cross_gpio >= GPIO_NUM_0 && config->zero_cross_gpio <= GPIO_NUM_MAX), ESP_ERR_INVALID_ARG, "Zero cross GPIO invalid.");
-    ZH_ERROR_CHECK((config->triac_gpio >= GPIO_NUM_0 && config->triac_gpio <= GPIO_NUM_MAX), ESP_ERR_INVALID_ARG, "Triac GPIO invalid.");
-    ZH_ERROR_CHECK((config->zero_cross_gpio != config->triac_gpio), ESP_ERR_INVALID_ARG, "Both GPIO is same.");
+    ZH_LOGI("AC dimmer getting status begin.");
+    ZH_ERROR_CHECK(value != NULL, ESP_ERR_INVALID_ARG, NULL, "AC dimmer getting status failed. Value is NULL.");
+    ZH_ERROR_CHECK(_is_initialized == true, ESP_ERR_INVALID_STATE, NULL, "AC dimmer getting status failed. AC dimmer is not initialized.");
+    *value = _dimmer_value;
+    ZH_LOGI("AC dimmer getting status completed successfully.");
     return ESP_OK;
 }
 
-esp_err_t _zh_ac_dimmer_gpio_init(const zh_ac_dimmer_init_config_t *config)
+static esp_err_t _zh_ac_dimmer_validate_config(const zh_ac_dimmer_init_config_t *config)
+{
+    ZH_ERROR_CHECK(config != NULL, ESP_ERR_INVALID_ARG, NULL, "Initial config is NULL.");
+    ZH_ERROR_CHECK(config->zero_cross_gpio < GPIO_NUM_MAX, ESP_ERR_INVALID_ARG, NULL, "Zero cross GPIO invalid.");
+    ZH_ERROR_CHECK(config->triac_gpio < GPIO_NUM_MAX, ESP_ERR_INVALID_ARG, NULL, "Triac GPIO invalid.");
+    ZH_ERROR_CHECK((config->zero_cross_gpio != config->triac_gpio), ESP_ERR_INVALID_ARG, NULL, "Both GPIO is same.");
+    return ESP_OK;
+}
+
+static esp_err_t _zh_ac_dimmer_gpio_init(const zh_ac_dimmer_init_config_t *config)
 {
     gpio_config_t triac_gpio_config = {
         .intr_type = GPIO_INTR_DISABLE,
@@ -96,30 +132,36 @@ esp_err_t _zh_ac_dimmer_gpio_init(const zh_ac_dimmer_init_config_t *config)
         .pull_up_en = GPIO_PULLUP_DISABLE,
     };
     esp_err_t err = gpio_config(&triac_gpio_config);
-    ZH_ERROR_CHECK(err == ESP_OK, err, "Triac GPIO configuration failed.");
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "Triac GPIO configuration failed.");
+    gpio_set_level((gpio_num_t)config->triac_gpio, 0);
     gpio_config_t zero_cross_gpio_config = {
         .intr_type = GPIO_INTR_POSEDGE,
         .mode = GPIO_MODE_INPUT,
         .pin_bit_mask = (1ULL << config->zero_cross_gpio),
-        .pull_down_en = GPIO_PULLDOWN_DISABLE,
+        .pull_down_en = GPIO_PULLDOWN_ENABLE,
         .pull_up_en = GPIO_PULLUP_DISABLE,
     };
     err = gpio_config(&zero_cross_gpio_config);
-    ZH_ERROR_CHECK(err == ESP_OK, err, "Zero cross GPIO configuration failed.");
-    gpio_set_level(_init_config.triac_gpio, 0);
+    ZH_ERROR_CHECK(err == ESP_OK, err, gpio_reset_pin((gpio_num_t)config->triac_gpio), "Zero cross GPIO configuration failed.");
+    err = gpio_install_isr_service(ESP_INTR_FLAG_LOWMED);
+    ZH_ERROR_CHECK(err == ESP_OK || err == ESP_ERR_INVALID_STATE, err, gpio_reset_pin((gpio_num_t)config->triac_gpio); gpio_reset_pin((gpio_num_t)config->zero_cross_gpio), "Failed install isr service.")
+    if (err == ESP_ERR_INVALID_STATE)
+    {
+        _is_prev_gpio_isr_handler = true;
+    }
+    err = gpio_isr_handler_add((gpio_num_t)config->zero_cross_gpio, _zh_ac_dimmer_isr_handler, NULL);
+    if (_is_prev_gpio_isr_handler == true)
+    {
+        ZH_ERROR_CHECK(err == ESP_OK, err, gpio_reset_pin((gpio_num_t)config->triac_gpio); gpio_reset_pin((gpio_num_t)config->zero_cross_gpio), "Failed add isr handler.");
+    }
+    else
+    {
+        ZH_ERROR_CHECK(err == ESP_OK, err, gpio_uninstall_isr_service(); gpio_reset_pin((gpio_num_t)config->triac_gpio); gpio_reset_pin((gpio_num_t)config->zero_cross_gpio), "Failed add isr handler.");
+    }
     return ESP_OK;
 }
 
-esp_err_t _zh_ac_dimmer_interrupt_init(const zh_ac_dimmer_init_config_t *config)
-{
-    esp_err_t err = gpio_install_isr_service(ESP_INTR_FLAG_LEVEL3);
-    ZH_ERROR_CHECK(err == ESP_OK, err, "Failed install isr service.")
-    err = gpio_isr_handler_add(config->zero_cross_gpio, _zh_ac_dimmer_isr_handler, NULL);
-    ZH_ERROR_CHECK(err == ESP_OK, err, "Failed add isr handler.");
-    return ESP_OK;
-}
-
-esp_err_t _zh_ac_dimmer_timer_init(void)
+static esp_err_t _zh_ac_dimmer_timer_init(void)
 {
     gptimer_config_t timer_config = {
         .clk_src = GPTIMER_CLK_SRC_DEFAULT,
@@ -127,54 +169,48 @@ esp_err_t _zh_ac_dimmer_timer_init(void)
         .resolution_hz = 1 * 1000 * 1000,
     };
     esp_err_t err = gptimer_new_timer(&timer_config, &_dimmer_timer);
-    ZH_ERROR_CHECK(err == ESP_OK, err, "Failed create dimmer timer.");
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "Failed create dimmer timer.");
     gptimer_event_callbacks_t cbs = {
         .on_alarm = _zh_ac_dimmer_timer_on_alarm_cb,
     };
     err = gptimer_register_event_callbacks(_dimmer_timer, &cbs, NULL);
-    ZH_ERROR_CHECK(err == ESP_OK, err, "Failed register dimmer timer event callbacks.");
+    ZH_ERROR_CHECK(err == ESP_OK, err, gptimer_del_timer(_dimmer_timer), "Failed register dimmer timer event callbacks.");
     err = gptimer_enable(_dimmer_timer);
-    ZH_ERROR_CHECK(err == ESP_OK, err, "Failed enable dimmer timer.");
+    ZH_ERROR_CHECK(err == ESP_OK, err, gptimer_register_event_callbacks(_dimmer_timer, NULL, NULL); gptimer_del_timer(_dimmer_timer), "Failed enable dimmer timer.");
     return ESP_OK;
 }
 
-void IRAM_ATTR _zh_ac_dimmer_isr_handler(void *arg)
+static void IRAM_ATTR _zh_ac_dimmer_isr_handler(void *arg)
 {
+    uint64_t _current_us = esp_timer_get_time();
+    if (_current_us - _prev_us <= (1250 * 0.9)) // 90% of zero crossing period (1250 µs) at 400 Hz.
+    {
+        return;
+    }
+    gpio_set_level((gpio_num_t)_init_config.triac_gpio, 0);
+    _prev_us = _current_us;
     if (_is_dimmer_work == false)
     {
         return;
     }
-    gpio_set_level(_init_config.triac_gpio, 0);
-    uint64_t _current_micros = esp_timer_get_time();
-    _current_frequency = _current_micros - _prev_micros;
-    _prev_micros = _current_micros;
-    if (_current_frequency < 1000)
-    {
-        if (_current_frequency > 50)
-        {
-            _zero_cross_time = _current_frequency;
-        }
-        _current_frequency = _prev_frequency;
-    }
-    _prev_frequency = _current_frequency;
     if (_dimmer_value != 0)
     {
         if (_dimmer_value == 100)
         {
-            gpio_set_level(_init_config.triac_gpio, 1);
+            gpio_set_level((gpio_num_t)_init_config.triac_gpio, 1);
             return;
         }
-        _alarm_config.alarm_count = ((_current_frequency / 110) * (100 - _dimmer_value)) + _zero_cross_time;
+        _alarm_config.alarm_count = (uint64_t)((((1250 - 330) / 100) * (100 - _dimmer_value)) + 330); // 330 is 50% of zero crossing time (by logic analyser).
         _alarm_config.flags.auto_reload_on_alarm = false;
         gptimer_set_alarm_action(_dimmer_timer, &_alarm_config);
         gptimer_start(_dimmer_timer);
     }
 }
 
-bool _zh_ac_dimmer_timer_on_alarm_cb(gptimer_handle_t timer, const gptimer_alarm_event_data_t *edata, void *user_ctx)
+static bool IRAM_ATTR _zh_ac_dimmer_timer_on_alarm_cb(gptimer_handle_t timer, const gptimer_alarm_event_data_t *edata, void *user_ctx)
 {
-    gpio_set_level(_init_config.triac_gpio, 1);
+    gpio_set_level((gpio_num_t)_init_config.triac_gpio, 1);
     gptimer_stop(_dimmer_timer);
     gptimer_set_raw_count(_dimmer_timer, 0);
-    return true;
+    return false;
 }