77 lines
2.7 KiB
C
77 lines
2.7 KiB
C
#include <stdio.h>
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#include <string.h>
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#include "esp_log.h"
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#include "driver/i2c.h"
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#include "driver/gpio.h"
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static const char *TAG = "i2c-slave";
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#define LED_PIN 2
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#define I2C_SLAVE_SCL_IO 22 /*!< gpio number for I2C master clock */
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#define I2C_SLAVE_SDA_IO 21 /*!< gpio number for I2C master data */
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#define I2C_SLAVE_FREQ_HZ 100000 /*!< I2C master clock frequency */
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#define I2C_SLAVE_TX_BUF_LEN 255 /*!< I2C master doesn't need buffer */
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#define I2C_SLAVE_RX_BUF_LEN 255 /*!< I2C master doesn't need buffer */
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#define ESP_SLAVE_ADDR 0x0A
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#define WRITE_BIT I2C_MASTER_WRITE /*!< I2C master write */
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#define READ_BIT I2C_MASTER_READ /*!< I2C master read */
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#define ACK_CHECK_EN 0x1 /*!< I2C master will check ack from slave*/
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#define ACK_CHECK_DIS 0x0 /*!< I2C master will not check ack from slave */
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#define ACK_VAL 0x0 /*!< I2C ack value */
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#define NACK_VAL 0x1 /*!< I2C nack value */
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int i2c_slave_port = 0;
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static esp_err_t i2c_slave_init(void)
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{
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i2c_config_t conf_slave = {
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.sda_io_num = I2C_SLAVE_SDA_IO, // select GPIO specific to your project
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.sda_pullup_en = GPIO_PULLUP_ENABLE,
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.scl_io_num = I2C_SLAVE_SCL_IO, // select GPIO specific to your project
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.scl_pullup_en = GPIO_PULLUP_ENABLE,
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.mode = I2C_MODE_SLAVE,
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.slave.addr_10bit_en = 0,
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.slave.slave_addr = ESP_SLAVE_ADDR, // address of your project
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.clk_flags = 0,
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};
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esp_err_t err = i2c_param_config(i2c_slave_port, &conf_slave);
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if (err != ESP_OK) {
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return err;
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}
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return i2c_driver_install(i2c_slave_port, conf_slave.mode, I2C_SLAVE_RX_BUF_LEN, I2C_SLAVE_TX_BUF_LEN, 0);
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}
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void app_main(void)
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{
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uint8_t received_data[I2C_SLAVE_RX_BUF_LEN] = {0};
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uint8_t on_command[] = "LED_ON";
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esp_rom_gpio_pad_select_gpio(LED_PIN);
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gpio_set_direction(LED_PIN, GPIO_MODE_OUTPUT);
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ESP_ERROR_CHECK(i2c_slave_init());
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ESP_LOGI(TAG, "I2C Slave initialized successfully");
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while(1)
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{
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i2c_slave_read_buffer(i2c_slave_port, received_data, I2C_SLAVE_RX_BUF_LEN, 100 / portTICK_PERIOD_MS);
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i2c_reset_rx_fifo(i2c_slave_port);
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if(strncmp((const char*)received_data, "LED_ON", 6) == 0)
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{
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ESP_LOGI(TAG, "Data Recived = %s", received_data);
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gpio_set_level(LED_PIN, 1);
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}
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else if(strncmp((const char*)received_data, "LED_OFF", 7) == 0)
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{
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ESP_LOGI(TAG, "Data Recived = %s", received_data);
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gpio_set_level(LED_PIN, 0);
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}
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memset(received_data, 0, I2C_SLAVE_RX_BUF_LEN);
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}
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}
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