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145 lines
3.2 KiB
C
145 lines
3.2 KiB
C
/**
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* @file BH1750.h
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* @author Oleksii Kutuzov (oleksii.kutuzov@icloud.com)
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* @brief
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* @version 0.1
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* @date 2022-11-06
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*
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* @copyright Copyright (c) 2022
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*
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* Ported from:
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* https://github.com/lamik/Light_Sensors_STM32
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*/
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#include "BH1750.h"
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BH1750_mode bh1750_mode = BH1750_DEFAULT_MODE; // Current sensor mode
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uint8_t bh1750_mt_reg = BH1750_DEFAULT_MTREG; // Current MT register value
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BH1750_STATUS bh1750_init() {
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if(BH1750_OK == bh1750_reset()) {
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if(BH1750_OK == bh1750_set_mt_reg(BH1750_DEFAULT_MTREG)) {
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return BH1750_OK;
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}
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}
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return BH1750_ERROR;
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}
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BH1750_STATUS bh1750_reset() {
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uint8_t command = 0x07;
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bool status;
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furi_hal_i2c_acquire(I2C_BUS);
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status = furi_hal_i2c_tx(I2C_BUS, BH1750_ADDRESS, &command, 1, I2C_TIMEOUT);
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furi_hal_i2c_release(I2C_BUS);
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if(status) {
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return BH1750_OK;
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}
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return BH1750_ERROR;
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}
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BH1750_STATUS bh1750_set_power_state(uint8_t PowerOn) {
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PowerOn = (PowerOn ? 1 : 0);
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bool status;
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furi_hal_i2c_acquire(I2C_BUS);
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status = furi_hal_i2c_tx(I2C_BUS, BH1750_ADDRESS, &PowerOn, 1, I2C_TIMEOUT);
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furi_hal_i2c_release(I2C_BUS);
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if(status) {
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return BH1750_OK;
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}
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return BH1750_ERROR;
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}
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BH1750_STATUS bh1750_set_mode(BH1750_mode mode) {
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if(!((mode >> 4) || (mode >> 5))) {
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return BH1750_ERROR;
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}
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if((mode & 0x0F) > 3) {
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return BH1750_ERROR;
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}
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bool status;
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bh1750_mode = mode;
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furi_hal_i2c_acquire(I2C_BUS);
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status = furi_hal_i2c_tx(I2C_BUS, BH1750_ADDRESS, &mode, 1, I2C_TIMEOUT);
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furi_hal_i2c_release(I2C_BUS);
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if(status) {
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return BH1750_OK;
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}
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return BH1750_ERROR;
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}
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BH1750_STATUS bh1750_set_mt_reg(uint8_t mt_reg) {
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if(mt_reg < 31 || mt_reg > 254) {
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return BH1750_ERROR;
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}
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bh1750_mt_reg = mt_reg;
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uint8_t tmp[2];
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bool status;
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tmp[0] = (0x40 | (mt_reg >> 5));
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tmp[1] = (0x60 | (mt_reg & 0x1F));
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furi_hal_i2c_acquire(I2C_BUS);
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status = furi_hal_i2c_tx(I2C_BUS, BH1750_ADDRESS, &tmp[0], 1, I2C_TIMEOUT);
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furi_hal_i2c_release(I2C_BUS);
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if(!status) {
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return BH1750_ERROR;
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}
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furi_hal_i2c_acquire(I2C_BUS);
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status = furi_hal_i2c_tx(I2C_BUS, BH1750_ADDRESS, &tmp[1], 1, I2C_TIMEOUT);
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furi_hal_i2c_release(I2C_BUS);
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if(status) {
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return BH1750_OK;
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}
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return BH1750_ERROR;
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}
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BH1750_STATUS bh1750_trigger_manual_conversion() {
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if(BH1750_OK == bh1750_set_mode(bh1750_mode)) {
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return BH1750_OK;
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}
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return BH1750_ERROR;
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}
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BH1750_STATUS bh1750_read_light(float* result) {
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float result_tmp;
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uint8_t rcv[2];
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bool status;
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furi_hal_i2c_acquire(I2C_BUS);
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status = furi_hal_i2c_rx(I2C_BUS, BH1750_ADDRESS, rcv, 2, I2C_TIMEOUT);
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furi_hal_i2c_release(I2C_BUS);
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if(status) {
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result_tmp = (rcv[0] << 8) | (rcv[1]);
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if(bh1750_mt_reg != BH1750_DEFAULT_MTREG) {
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result_tmp *= (float)((uint8_t)BH1750_DEFAULT_MTREG / (float)bh1750_mt_reg);
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}
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if(bh1750_mode == ONETIME_HIGH_RES_MODE_2 || bh1750_mode == CONTINUOUS_HIGH_RES_MODE_2) {
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result_tmp /= 2.0;
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}
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*result = result_tmp / BH1750_CONVERSION_FACTOR;
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return BH1750_OK;
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}
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return BH1750_ERROR;
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}
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