i2c_cmd_device.c

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#include "i2c_cmd_device.h"
 
#include "driver/i2c_master.h"
#include "esp_check.h"
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "i2c_bus.h"
 
static const char *TAG = "i2c_cmd";
 
#define I2C_DEVICE_ADDR         0x20
#define CMD_INTERVAL_MS         1000
 
static uint8_t s_commands[] = {
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
    0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
    0x10, 0x11
};
 
static i2c_master_dev_handle_t s_i2c_dev;
static bool s_initialized;
 
static esp_err_t i2c_cmd_send(uint8_t *data, size_t data_len)
{
    return i2c_master_transmit(s_i2c_dev, data, data_len, I2C_BUS_TIMEOUT_MS);
}
 
esp_err_t i2c_cmd_device_init(void)
{
    if (s_initialized) {
        return ESP_OK;
    }
 
    ESP_RETURN_ON_ERROR(i2c_bus_init(), TAG, "shared bus init failed");
    ESP_RETURN_ON_ERROR(i2c_bus_add_device(I2C_DEVICE_ADDR, &s_i2c_dev),
                        TAG, "add LCM device failed");
 
    s_initialized = true;
    ESP_LOGI(TAG, "LCM device 0x%02X on shared I2C bus", I2C_DEVICE_ADDR);
    return ESP_OK;
}
 
static void i2c_cmd_task(void *arg)
{
    size_t idx = 0;
    esp_err_t err = ESP_OK;
 
    (void)arg;
 
    while (true) {
        err = i2c_cmd_send(s_commands + idx, 1);
 
        if (err == ESP_OK) {
            ESP_LOGI(TAG, "Sent command 0x%02X", s_commands[idx]);
        } else {
            ESP_LOGW(TAG, "Send 0x%02X failed: %s", s_commands[idx], esp_err_to_name(err));
        }
 
        idx = (idx + 1) % (sizeof(s_commands) / sizeof(s_commands[0]));
        vTaskDelay(pdMS_TO_TICKS(CMD_INTERVAL_MS));
    }
}
 
esp_err_t i2c_cmd_device_start(void)
{
    static bool started = false;
 
    ESP_RETURN_ON_FALSE(s_initialized, ESP_ERR_INVALID_STATE, TAG, "not initialized");
 
    if (started) {
        return ESP_OK;
    }
 
    BaseType_t created = xTaskCreate(i2c_cmd_task, "i2c_cmd", 2048, NULL, 5, NULL);
    ESP_RETURN_ON_FALSE(created == pdPASS, ESP_ERR_NO_MEM, TAG, "task create failed");
 
    started = true;
    ESP_LOGI(TAG, "LCM command task started (every %d ms)", CMD_INTERVAL_MS);
    return ESP_OK;
}