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ESP-Nodes/ESP32-IDF_BMP280/main/main.c
Alexandre B 7aaccd79af .
2024-07-10 10:26:02 -04:00

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/* ESP32 Module I2C Master Device
Author: Alexander Bobkov
Date: July 3, 2024
Modified: July 9, 2024
Adopted from i2c - Simple example
Simple I2C example that shows how to initialize I2C
as well as reading and writing from and to registers for a sensor connected over I2C.
The sensor used in this example is a MPU9250 inertial measurement unit.
For other examples please check:
https://github.com/espressif/esp-idf/tree/master/examples
See README.md file to get detailed usage of this example.
This example code is in the Public Domain (or CC0 licensed, at your option.)
Unless required by applicable law or agreed to in writing, this
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.
*/
#include <stdio.h>
#include "esp_log.h"
#include "driver/i2c.h"
#include "bme280.h"
static const char *TAG = "i2c-simple-example";
#define I2C_MASTER_SCL_IO CONFIG_I2C_MASTER_SCL /*!< GPIO number used for I2C master clock */
#define I2C_MASTER_SDA_IO CONFIG_I2C_MASTER_SDA /*!< GPIO number used for I2C master data */
#define I2C_MASTER_NUM I2C_NUM_0 /*!< I2C master i2c port number, the number of i2c peripheral interfaces available will depend on the chip */
#define I2C_MASTER_FREQ_HZ 400000 /*!< 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 I2C_MASTER_TIMEOUT_MS 1000
#define I2C_ACKS 0x1
#define I2C_ACKM 0x0
#define I2C_NOACKM 0x1 // I2C NACK value
#define I2C_WRITE_BIT I2C_MASTER_WRITE
#define I2C_RED_BIT I2C_MASTER_READ
#define MPU9250_SENSOR_ADDR 0x76 /*!< Slave address of the MPU9250 sensor */
#define MPU9250_WHO_AM_I_REG_ADDR 0xD0 /*!< Register addresses of the "who am I" register */
#define MPU9250_PWR_MGMT_1_REG_ADDR 0x88 /*!< Register addresses of the power managment register */
#define MPU9250_RESET_BIT 7
/**
* @brief Read a sequence of bytes from a MPU9250 sensor registers
*/
static esp_err_t mpu9250_register_read(uint8_t reg_addr, uint8_t *data, size_t len)
{
return i2c_master_write_read_device(I2C_MASTER_NUM, MPU9250_SENSOR_ADDR, &reg_addr, 1, data, len, I2C_MASTER_TIMEOUT_MS / portTICK_PERIOD_MS);
}
/*static esp_err_t bme280_I2C_burst_read(uint8_t device_address, uint8_t register_address, uint8_t *registers_data, size_t count)
{
int command_result = 0;
//unsigned char array[BME280_I2C_BUFFER_LEN];
unsigned char pos;
array[0] = register_address;
command_result = i2c_master_write_read_device(0, device_address, write_buffer, write_size, *array, read_size, I2C_MASTER_TIMEOUT_MS / portTICK_PERIOD_MS);
//error = i2c_master_write_read_device(I2C_MASTER_NUM, MPU9250_SENSOR_ADDR, &register_address, 1, registers_data, count, I2C_MASTER_TIMEOUT_MS / portTICK_PERIOD_MS);
}*/
static esp_err_t bme280_read_raw_temperature(uint8_t device_address, uint8_t *raw_temperature) {
// BME280_INIT_VALUE LN 136
// BME280_TEMPERATURE_MSB_REG 0xFA
// BME280_TEMPERATURE_DATA_LENGTH
// BME280_TEMPERATURE_DATA_SIZE
// I2C_MASTER_TIMEOUT_MS / portTICK_PERIOD_MS
esp_err_t command_result;
//unsigned char raw_temperature[BME280_TEMPERATURE_DATA_SIZE] = {0, 0, 0};
//command_result = i2c_master_read_from_device(0, BME280_I2C_ADDRESS1, *raw_temperature, BME280_TEMPERATURE_DATA_SIZE, I2C_MASTER_TIMEOUT_MS / portTICK_PERIOD_MS);
command_result = i2c_master_write_read_device(0, device_address, *raw_temperature, BME280_TEMPERATURE_DATA_SIZE, BME280_TEMPERATURE_REGISTER, 1, I2C_MASTER_TIMEOUT_MS / portTICK_PERIOD_MS);
return command_result;
}
/**
* @brief Write a byte to a MPU9250 sensor register
*/
static esp_err_t mpu9250_register_write_byte(uint8_t reg_addr, uint8_t data)
{
int ret;
uint8_t write_buf[2] = {reg_addr, data};
ret = i2c_master_write_to_device(I2C_MASTER_NUM, MPU9250_SENSOR_ADDR, write_buf, sizeof(write_buf), I2C_MASTER_TIMEOUT_MS / portTICK_PERIOD_MS);
return ret;
}
/**
* @brief i2c master initialization
static esp_err_t i2c_master_init(void)
{
int i2c_master_port = I2C_MASTER_NUM;
i2c_config_t conf = {
.mode = I2C_MODE_MASTER,
.sda_io_num = I2C_MASTER_SDA_IO,
.scl_io_num = I2C_MASTER_SCL_IO,
.sda_pullup_en = GPIO_PULLUP_ENABLE,
.scl_pullup_en = GPIO_PULLUP_ENABLE,
.master.clk_speed = I2C_MASTER_FREQ_HZ,
};
i2c_param_config(i2c_master_port, &conf);
return i2c_driver_install(i2c_master_port, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
}*/
/**
* @brief Initialize ESP32 as an I2C master device
*/
static esp_err_t i2c_driver_initialize(void)
{
int i2c_master_port = 0;
i2c_config_t conf = {
.mode = I2C_MODE_MASTER,
.sda_io_num = GPIO_NUM_21,
.sda_pullup_en = GPIO_PULLUP_ENABLE,
.scl_io_num = GPIO_NUM_22,
.sda_pullup_en = GPIO_PULLUP_ENABLE,
.master.clk_speed = I2C_MASTER_FREQ_HZ,
.clk_flags= 0,
};
return i2c_param_config(i2c_master_port, &conf);
}
void app_main(void)
{
// CONNECT TO BMP280
ESP_ERROR_CHECK(i2c_driver_initialize());
i2c_driver_install(I2C_NUM_0, I2C_MODE_MASTER, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
uint8_t address = 0x76;
i2c_cmd_handle_t command = i2c_cmd_link_create();
i2c_master_start(command);
i2c_master_write_byte(command, (address << 1) | I2C_MASTER_WRITE, I2C_ACKS);// 0x1); // 0x1 -> check ACK from slave
i2c_master_stop(command);
esp_err_t cmd_ret = i2c_master_cmd_begin(I2C_NUM_0, command, I2C_MASTER_TIMEOUT_MS / portTICK_PERIOD_MS);
i2c_cmd_link_delete(command);
i2c_driver_delete(I2C_NUM_0);
if (cmd_ret == ESP_OK)
ESP_LOGI(TAG, "I2C device found at address 0x%X", address);
else
ESP_LOGI(TAG, "error %X", cmd_ret);
// REQUEST DEVICE ID
// The sequence of commands corresponds to the BME-280 I2C protocol
int len = 1; // 1 byte
uint8_t *data = malloc(len);
//uint8_t address = 0x76;
uint8_t register_address = 0xD0; // Register that stores device ID
ESP_ERROR_CHECK(i2c_driver_initialize());
i2c_driver_install(I2C_NUM_0, I2C_MODE_MASTER, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
command = i2c_cmd_link_create();
// Step 1. START
i2c_master_start(command);
// Step 2. Send device address, WRITE bit, and wait for acknowledgment
i2c_master_write_byte(command, address << 1 | I2C_MASTER_WRITE, 0x1);
// Step 3. Specify (write) register address, and wait for acknowledgment
i2c_master_write_byte(command, register_address, 0x1);
// Step 4. START
i2c_master_start(command);
// Step 5. Send device address, READ bit, and wait for acknowledgment
i2c_master_write_byte(command, address << 1 | I2C_MASTER_READ, 0x1);
if (len > 1)
i2c_master_read(command, data, len-1, 0x0);
// Step 6. Read one byte of data from register
i2c_master_read_byte(command, data+len-1, 0x1);
// Step 8. STOP
i2c_master_stop(command);
// Step 7. Read one byte of data from register
cmd_ret = i2c_master_cmd_begin(I2C_NUM_0, command, 1000 / portTICK_PERIOD_MS);
i2c_cmd_link_delete(command);
if (cmd_ret == ESP_OK) {
ESP_LOGI(TAG, "Register read success");
for (int i = 0; i < len; i++) {
//printf("0x%02x ", data[i]);
if (data[i] == 0x60)
ESP_LOGI(TAG, "Device ID is 0x%X (BME-280)", data[i]);
else if (data[i] == 0x58)
ESP_LOGI(TAG, "Device ID is 0x%X (BMP-280)", data[i]);
else
ESP_LOGI(TAG, "Device ID is 0x%X", data[i]);
}
} else if (cmd_ret == ESP_ERR_TIMEOUT) {
ESP_LOGW(TAG, "Bus is busy");
} else {
ESP_LOGW(TAG, "Read failed");
}
free(data);
i2c_driver_delete(I2C_NUM_0);
}
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