doc: updated readme

README.md

@@ -16,6 +16,14 @@
 2. All the INT GPIO's on the extenders must be connected to the one GPIO on ESP.
 3. The input GPIO's are always pullup to the power supply.
 
+## Attention
+
+For correct operation, please enable the following settings in the menuconfig:
+
+```text
+GPIO_CTRL_FUNC_IN_IRAM
+```
+
 ## Dependencies
 
 1. [zh_vector](http://git.zh.com.ru/esp_components/zh_vector)
@@ -76,12 +84,12 @@ void app_main(void)
     i2c_new_master_bus(&i2c_bus_config, &i2c_bus_handle);
     esp_event_loop_create_default();                                                                          // Required only if used input GPIO interrupts.
     esp_event_handler_instance_register(ZH_PCF8574, ESP_EVENT_ANY_ID, &zh_pcf8574_event_handler, NULL, NULL); // Required only if used input GPIO interrupts.
-    zh_pcf8574_init_config_t pcf8574_init_config = ZH_PCF8574_INIT_CONFIG_DEFAULT();
+    zh_pcf8574_init_config_t config = ZH_PCF8574_INIT_CONFIG_DEFAULT();
-    pcf8574_init_config.i2c_handle = i2c_bus_handle;
+    config.i2c_handle = i2c_bus_handle;
-    pcf8574_init_config.i2c_address = 0x38;
+    config.i2c_address = 0x38;
-    pcf8574_init_config.p0_gpio_work_mode = true;     // Required only for input GPIO.
+    config.p0_gpio_work_mode = true;     // Required only for input GPIO.
-    pcf8574_init_config.interrupt_gpio = GPIO_NUM_14; // Required only if used input GPIO interrupts.
+    config.interrupt_gpio = GPIO_NUM_14; // Required only if used input GPIO interrupts.
-    zh_pcf8574_init(&pcf8574_init_config, &pcf8574_handle);
+    zh_pcf8574_init(&config, &pcf8574_handle);
     uint8_t reg = 0;
     zh_pcf8574_read(&pcf8574_handle, &reg);
     print_gpio_status("GPIO status: ", reg);

zh_pcf8574.c

@@ -61,7 +61,7 @@ esp_err_t zh_pcf8574_init(const zh_pcf8574_init_config_t *config, zh_pcf8574_han
 esp_err_t zh_pcf8574_read(zh_pcf8574_handle_t *handle, uint8_t *reg)
 {
     ZH_LOGI("PCF8574 read register started.");
-    ZH_ERROR_CHECK(handle != NULL || reg != NULL, ESP_ERR_INVALID_ARG, NULL, "PCF8574 read register failed. Invalid argument.");
+    ZH_ERROR_CHECK(handle != NULL && reg != NULL, ESP_ERR_INVALID_ARG, NULL, "PCF8574 read register failed. Invalid argument.");
     ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_NOT_FOUND, NULL, "PCF8574 read register failed. PCF8574 not initialized.");
     esp_err_t err = _zh_pcf8574_read_register(handle, reg);
     ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "PCF8574 read register failed.");
@@ -94,7 +94,7 @@ esp_err_t zh_pcf8574_reset(zh_pcf8574_handle_t *handle)
 esp_err_t zh_pcf8574_read_gpio(zh_pcf8574_handle_t *handle, uint8_t gpio, bool *status)
 {
     ZH_LOGI("PCF8574 read GPIO started.");
-    ZH_ERROR_CHECK(handle != NULL || status != NULL, ESP_ERR_INVALID_ARG, NULL, "PCF8574 read GPIO failed. Invalid argument.");
+    ZH_ERROR_CHECK(handle != NULL && status != NULL, ESP_ERR_INVALID_ARG, NULL, "PCF8574 read GPIO failed. Invalid argument.");
     ZH_ERROR_CHECK(gpio <= 7, ESP_FAIL, NULL, "PCF8574 read GPIO failed. Invalid GPIO number.")
     ZH_ERROR_CHECK(handle->is_initialized == true, ESP_ERR_NOT_FOUND, NULL, "PCF8574 read GPIO failed. PCF8574 not initialized.");
     uint8_t gpio_temp = _gpio_matrix[gpio];
@@ -175,7 +175,7 @@ static esp_err_t _zh_pcf8574_i2c_init(const zh_pcf8574_init_config_t *config, zh
     };
     i2c_master_dev_handle_t _dev_handle = NULL;
     esp_err_t err = i2c_master_bus_add_device(config->i2c_handle, &pcf8574_config, &_dev_handle);
-    ZH_ERROR_CHECK(err == ESP_OK, err, NULL;, "Failed to add I2C device.");
+    ZH_ERROR_CHECK(err == ESP_OK, err, NULL, "Failed to add I2C device.");
     err = i2c_master_probe(config->i2c_handle, config->i2c_address, 1000 / portTICK_PERIOD_MS);
     ZH_ERROR_CHECK(err == ESP_OK, err, i2c_master_bus_rm_device(_dev_handle), "Expander not connected or not responding.");
     handle->dev_handle = _dev_handle;