wip:

.gitignore

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+build
+.vscode
+.DS_Store
+sdkconfig.old

.gitmodules

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+[submodule "components/zh_pcf8574"]
+	path = components/zh_pcf8574
+	url = http://git.zh.com.ru/alexey.zholtikov/zh_pcf8574
+[submodule "components/zh_vector"]
+	path = components/zh_vector
+	url = http://git.zh.com.ru/alexey.zholtikov/zh_vector

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(ate0004)

main/CMakeLists.txt

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+idf_component_register(SRCS "main.c" INCLUDE_DIRS "" REQUIRES zh_pcf8574)

main/main.c

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+#include "zh_pcf8574.h"
+
+#define I2C_PORT (I2C_NUM_MAX - 1)
+
+#ifndef CONFIG_IDF_TARGET_ESP8266
+i2c_master_bus_handle_t i2c_bus_handle = NULL;
+#endif
+
+zh_pcf8574_handle_t pcf8574_handle = {0};
+
+void zh_pcf8574_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data); // Required only if used input GPIO interrupts.
+
+void print_gpio_status(const char *message, uint8_t reg)
+{
+    printf("%s", message);
+    for (uint8_t i = 0; i < 8; ++i)
+    {
+        printf("%c", (reg & 0x80) ? '1' : '0');
+        reg <<= 1;
+    }
+    printf(".\n");
+}
+
+void app_main(void)
+{
+    esp_log_level_set("zh_pcf8574", ESP_LOG_NONE); // For ESP8266 first enable "Component config -> Log output -> Enable log set level" via menuconfig.
+    esp_log_level_set("zh_vector", ESP_LOG_NONE);  // For ESP8266 first enable "Component config -> Log output -> Enable log set level" via menuconfig.
+#ifdef CONFIG_IDF_TARGET_ESP8266
+    i2c_config_t i2c_config = {
+        .mode = I2C_MODE_MASTER,
+        .sda_io_num = GPIO_NUM_4, // In accordance with used chip.
+        .sda_pullup_en = GPIO_PULLUP_ENABLE,
+        .scl_io_num = GPIO_NUM_5, // In accordance with used chip.
+        .scl_pullup_en = GPIO_PULLUP_ENABLE,
+    };
+    i2c_driver_install(I2C_PORT, i2c_config.mode);
+    i2c_param_config(I2C_PORT, &i2c_config);
+#else
+    i2c_master_bus_config_t i2c_bus_config = {
+        .clk_source = I2C_CLK_SRC_DEFAULT,
+        .i2c_port = I2C_PORT,
+        .scl_io_num = GPIO_NUM_22, // In accordance with used chip.
+        .sda_io_num = GPIO_NUM_21, // In accordance with used chip.
+        .glitch_ignore_cnt = 7,
+        .flags.enable_internal_pullup = true,
+    };
+    i2c_new_master_bus(&i2c_bus_config, &i2c_bus_handle);
+#endif
+    esp_event_loop_create_default(); // Required only if used input GPIO interrupts.
+#ifdef CONFIG_IDF_TARGET_ESP8266
+    esp_event_handler_register(ZH_PCF8574, ESP_EVENT_ANY_ID, &zh_pcf8574_event_handler, NULL); // Required only if used input GPIO interrupts.
+#else
+    esp_event_handler_instance_register(ZH_PCF8574, ESP_EVENT_ANY_ID, &zh_pcf8574_event_handler, NULL, NULL); // Required only if used input GPIO interrupts.
+#endif
+    zh_pcf8574_init_config_t pcf8574_init_config = ZH_PCF8574_INIT_CONFIG_DEFAULT();
+#ifdef CONFIG_IDF_TARGET_ESP8266
+    pcf8574_init_config.i2c_port = I2C_PORT;
+#else
+    pcf8574_init_config.i2c_handle = i2c_bus_handle;
+#endif
+    pcf8574_init_config.i2c_address = 0x38;
+    pcf8574_init_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.
+    zh_pcf8574_init(&pcf8574_init_config, &pcf8574_handle);
+    uint8_t reg = 0;
+    zh_pcf8574_read(&pcf8574_handle, &reg);
+    print_gpio_status("GPIO status: ", reg);
+    printf("Set P7 to 1, P1 to 1 and P0 to 0.\n");
+    zh_pcf8574_write(&pcf8574_handle, 0b10000010); // GPIO P0 will not be changed because it is operating in input mode.
+    zh_pcf8574_read(&pcf8574_handle, &reg);
+    print_gpio_status("GPIO status: ", reg);
+    printf("Sets P0 to 0.\n");
+    zh_pcf8574_write_gpio(&pcf8574_handle, 0, false); // GPIO P0 will not be changed because it is operating in input mode.
+    bool gpio = 0;
+    zh_pcf8574_read_gpio(&pcf8574_handle, 0, &gpio);
+    printf("P0 status: %d.\n", gpio);
+    printf("Set P1 to 0.\n");
+    zh_pcf8574_write_gpio(&pcf8574_handle, 1, false);
+    zh_pcf8574_read_gpio(&pcf8574_handle, 1, &gpio);
+    printf("P1 status: %d.\n", gpio);
+    zh_pcf8574_read(&pcf8574_handle, &reg);
+    print_gpio_status("GPIO status: ", reg);
+    printf("Reset all GPIO.\n");
+    zh_pcf8574_reset(&pcf8574_handle);
+    zh_pcf8574_read(&pcf8574_handle, &reg);
+    print_gpio_status("GPIO status: ", reg);
+}
+
+void zh_pcf8574_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data) // Required only if used input GPIO interrupts.
+{
+    zh_pcf8574_event_on_isr_t *event = event_data;
+    printf("Interrupt happened on device address 0x%02X on GPIO number %d at level %d.\n", event->i2c_address, event->gpio_number, event->gpio_level);
+}

version.txt

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+1.0.0