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https://github.com/alexandrebobkov/ESP-Nodes.git
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54 lines
2.2 KiB
C
54 lines
2.2 KiB
C
#include "bme280.h"
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static esp_err_t bme280_read_raw_temperature(uint8_t device_address, uint8_t *raw_temperature) {}
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// REQUESTS DEVICE ID
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static esp_err_t bme280_get_id(i2c_cmd_handle_t command, uint8_t device_address) {
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// The sequence of commands corresponds to the BME-280 I2C protocol
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int len = 1; // 1 byte
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uint8_t *data = malloc(len);
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//uint8_t address = 0x76;
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uint8_t register_address = 0xD0; // Register that stores device ID
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ESP_ERROR_CHECK(i2c_driver_initialize());
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i2c_driver_install(I2C_NUM_0, I2C_MODE_MASTER, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
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command = i2c_cmd_link_create();
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// Step 1. START
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i2c_master_start(command);
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// Step 2. Send device address, WRITE bit, and wait for acknowledgment
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i2c_master_write_byte(command, device_address << 1 | I2C_MASTER_WRITE, 0x1);
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// Step 3. Specify (write) register address, and wait for acknowledgment
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i2c_master_write_byte(command, register_address, 0x1);
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// Step 4. START
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i2c_master_start(command);
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// Step 5. Send device address, READ bit, and wait for acknowledgment
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i2c_master_write_byte(command, device_address << 1 | I2C_MASTER_READ, 0x1);
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if (len > 1)
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i2c_master_read(command, data, len-1, 0x0);
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// Step 6. Read one byte of data from register
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i2c_master_read_byte(command, data+len-1, 0x1);
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// Step 8. STOP
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i2c_master_stop(command);
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// Step 7. Read one byte of data from register
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esp_err_t cmd_ret = i2c_master_cmd_begin(I2C_NUM_0, command, 1000 / portTICK_PERIOD_MS);
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i2c_cmd_link_delete(command);
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return cmd_ret;
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/*if (cmd_ret == ESP_OK) {
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ESP_LOGI(TAG, "Register read success");
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for (int i = 0; i < len; i++) {
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//printf("0x%02x ", data[i]);
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if (data[i] == 0x60)
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ESP_LOGI(TAG, "Device ID is 0x%X (BME-280)", data[i]);
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else if (data[i] == 0x58)
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ESP_LOGI(TAG, "Device ID is 0x%X (BMP-280)", data[i]);
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else
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ESP_LOGI(TAG, "Device ID is 0x%X", data[i]);
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}
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} else if (cmd_ret == ESP_ERR_TIMEOUT) {
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ESP_LOGW(TAG, "Bus is busy");
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} else {
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ESP_LOGW(TAG, "Read failed");
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}*/
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}
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void init_bme280() {} |