update

Master/main/main.c

@@ -0,0 +1,74 @@
+#include <stdio.h>
+#include <string.h>
+#include "esp_log.h"
+#include "driver/i2c.h"
+
+static const char *TAG = "i2c-master";
+
+
+#define I2C_MASTER_SCL_IO 22               /*!< gpio number for I2C master clock */
+#define I2C_MASTER_SDA_IO 21               /*!< gpio number for I2C master data  */
+#define I2C_MASTER_FREQ_HZ 100000        /*!< I2C master clock frequency */
+#define I2C_MASTER_TX_BUF_DISABLE 0                           /*!< I2C master doesn't need buffer */
+#define I2C_MASTER_RX_BUF_DISABLE 0                           /*!< I2C master doesn't need buffer */
+#define SLAVE_ADDRESS 0x0A
+
+#define WRITE_BIT I2C_MASTER_WRITE              /*!< I2C master write */
+#define READ_BIT I2C_MASTER_READ                /*!< I2C master read */
+#define ACK_CHECK_EN 0x1                        /*!< I2C master will check ack from slave*/
+#define ACK_CHECK_DIS 0x0                       /*!< I2C master will not check ack from slave */
+#define ACK_VAL 0x0                             /*!< I2C ack value */
+#define NACK_VAL 0x1                            /*!< I2C nack value */
+
+int i2c_master_port = 0;
+static esp_err_t i2c_master_init(void)
+{
+  
+    i2c_config_t conf = {
+        .mode = I2C_MODE_MASTER,
+        .sda_io_num = I2C_MASTER_SDA_IO,
+        .sda_pullup_en = GPIO_PULLUP_ENABLE,
+        .scl_io_num = I2C_MASTER_SCL_IO,
+        .scl_pullup_en = GPIO_PULLUP_ENABLE,
+        .master.clk_speed = I2C_MASTER_FREQ_HZ,
+        // .clk_flags = 0,          /*!< Optional, you can use I2C_SCLK_SRC_FLAG_* flags to choose i2c source clock here. */
+    };
+    esp_err_t err = i2c_param_config(i2c_master_port, &conf);
+    if (err != ESP_OK) {
+        return err;
+    }
+    return i2c_driver_install(i2c_master_port, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
+}
+
+static esp_err_t i2c_master_send(uint8_t message[], int len)
+{
+    ESP_LOGI(TAG, "Sending Message = %s", message);   
+    
+    esp_err_t ret; 
+    i2c_cmd_handle_t cmd = i2c_cmd_link_create();    
+    i2c_master_start(cmd);
+    i2c_master_write_byte(cmd, SLAVE_ADDRESS << 1 | WRITE_BIT, ACK_CHECK_EN);
+    i2c_master_write(cmd, message, len, ACK_CHECK_EN);
+    i2c_master_stop(cmd);
+    
+    ret = i2c_master_cmd_begin(i2c_master_port, cmd, 1000 / portTICK_PERIOD_MS);
+    i2c_cmd_link_delete(cmd);
+    return ret;
+}
+
+void app_main(void)
+{
+    const uint8_t  on_command[] = "LED_ON";
+    const uint8_t  off_command[] = "LED_OFF";
+    ESP_ERROR_CHECK(i2c_master_init());
+    ESP_LOGI(TAG, "I2C initialized successfully");
+
+    while(1)
+    {
+        i2c_master_send(on_command, sizeof(on_command));
+        vTaskDelay(1000/ portTICK_PERIOD_MS);
+        i2c_master_send(off_command, sizeof(off_command));
+        vTaskDelay(1000/ portTICK_PERIOD_MS);  
+    }
+    
+}