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Alexander 2024-07-17 11:58:20 -04:00
parent 528e7c7cdc
commit bba9cde9f9
2 changed files with 57 additions and 2 deletions
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54
ESP32-Rainmaker-Switch/main/bme280.c
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@ -1,4 +1,54 @@
#include "bme280.h" #include "bme280.h"
static esp_err_t bme280_read_raw_temperature(uint8_t device_address, uint8_t *raw_temperature); static esp_err_t bme280_read_raw_temperature(uint8_t device_address, uint8_t *raw_temperature) {}
static esp_err_t bme280_get_id(uint8_t device_address);
// REQUESTS DEVICE ID
static esp_err_t bme280_get_id(i2c_cmd_handle_t command, uint8_t device_address) {
// 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, device_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, device_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);
return cmd_ret;
/*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");
}*/
}
void init_bme280() {}

5
ESP32-Rainmaker-Switch/main/bme280.h
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@ -2,6 +2,7 @@
#define __BME280_H__ #define __BME280_H__
#include "driver/i2c.h" #include "driver/i2c.h"
#include "esp_log.h"
#define BME280_CHIP_ID (0xD0) #define BME280_CHIP_ID (0xD0)
#define BME280_I2C_ADDRESS1 (0x76) // BME280 Data sheet p. 32 #define BME280_I2C_ADDRESS1 (0x76) // BME280 Data sheet p. 32
@ -15,6 +16,10 @@
#define BME280_HUMIDITY_DATA_SIZE (2) #define BME280_HUMIDITY_DATA_SIZE (2)
#define BME280_HUMIDITY_DATA_LENGTH (2) #define BME280_HUMIDITY_DATA_LENGTH (2)
#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 */
/** GLOBAL MEMORY MAN AND REGISTERS /** GLOBAL MEMORY MAN AND REGISTERS
* BME280 Data Sheet p. 26 * BME280 Data Sheet p. 26