update

Slave/main/main.c

@@ -0,0 +1,76 @@
+#include <stdio.h>
+#include <string.h>
+#include "esp_log.h"
+#include "driver/i2c.h"
+#include "driver/gpio.h"
+
+static const char *TAG = "i2c-slave";
+
+#define LED_PIN 2
+
+#define I2C_SLAVE_SCL_IO 22               /*!< gpio number for I2C master clock */
+#define I2C_SLAVE_SDA_IO 21               /*!< gpio number for I2C master data  */
+#define I2C_SLAVE_FREQ_HZ 100000        /*!< I2C master clock frequency */
+#define I2C_SLAVE_TX_BUF_LEN 255                        /*!< I2C master doesn't need buffer */
+#define I2C_SLAVE_RX_BUF_LEN 255                           /*!< I2C master doesn't need buffer */
+#define ESP_SLAVE_ADDR 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_slave_port = 0;
+static esp_err_t i2c_slave_init(void)
+{
+  
+    i2c_config_t conf_slave = {
+    .sda_io_num = I2C_SLAVE_SDA_IO,          // select GPIO specific to your project
+    .sda_pullup_en = GPIO_PULLUP_ENABLE,
+    .scl_io_num = I2C_SLAVE_SCL_IO,          // select GPIO specific to your project
+    .scl_pullup_en = GPIO_PULLUP_ENABLE,
+    .mode = I2C_MODE_SLAVE,
+    .slave.addr_10bit_en = 0,
+    .slave.slave_addr = ESP_SLAVE_ADDR,      // address of your project
+    .clk_flags = 0,
+    };
+    esp_err_t err = i2c_param_config(i2c_slave_port, &conf_slave);
+    if (err != ESP_OK) {
+        return err;
+    }
+    return i2c_driver_install(i2c_slave_port, conf_slave.mode, I2C_SLAVE_RX_BUF_LEN, I2C_SLAVE_TX_BUF_LEN, 0);
+}
+
+void app_main(void)
+{
+    uint8_t  received_data[I2C_SLAVE_RX_BUF_LEN] = {0};
+    uint8_t  on_command[] = "LED_ON";
+
+    esp_rom_gpio_pad_select_gpio(LED_PIN);
+    gpio_set_direction(LED_PIN, GPIO_MODE_OUTPUT);
+
+    ESP_ERROR_CHECK(i2c_slave_init());
+    ESP_LOGI(TAG, "I2C Slave initialized successfully");
+    
+    while(1)
+    {
+    i2c_slave_read_buffer(i2c_slave_port, received_data, I2C_SLAVE_RX_BUF_LEN, 100 / portTICK_PERIOD_MS);
+    i2c_reset_rx_fifo(i2c_slave_port);
+
+    if(strncmp((const char*)received_data, "LED_ON", 6) == 0)
+    {   
+    ESP_LOGI(TAG, "Data Recived = %s", received_data);
+    gpio_set_level(LED_PIN, 1);
+    }
+    else if(strncmp((const char*)received_data, "LED_OFF", 7) == 0)
+    {
+    ESP_LOGI(TAG, "Data Recived = %s", received_data);   
+    gpio_set_level(LED_PIN, 0);
+    }
+
+    memset(received_data, 0, I2C_SLAVE_RX_BUF_LEN);
+    }
+
+}