Add code

.gitignore

@@ -50,3 +50,6 @@ modules.order
 Module.symvers
 Mkfile.old
 dkms.conf
+
+# macOS
+.DS_Store

BH1750.c

@@ -0,0 +1,180 @@
+/*
+ * BH1750.c
+ *
+ *	The MIT License.
+ *  Created on: 06.11.2022
+ *      Author: Oleksii Kutuzov
+ *
+ *	Ported from:
+ *	https://github.com/lamik/Light_Sensors_STM32
+ */
+
+#include "BH1750.h"
+
+BH1750* bh1750_alloc() {
+    BH1750* bh1750 = malloc(sizeof(BH1750));
+    bh1750->mode = BH1750_DEFAULT_MODE;
+    bh1750->mt_reg = BH1750_DEFAULT_MTREG;
+    return bh1750;
+}
+
+void bh1750_free(BH1750* bh1750) {
+    furi_assert(bh1750);
+    free(bh1750);
+}
+
+//
+//	Initialization.
+//
+BH1750_STATUS bh1750_init(BH1750* bh1750) {
+    if(BH1750_OK == bh1750_reset(bh1750)) {
+        if(BH1750_OK == bh1750_set_mt_reg(bh1750, BH1750_DEFAULT_MTREG)) // Set default value;
+            return BH1750_OK;
+    }
+    return BH1750_ERROR;
+}
+
+//
+//	Reset all registers to default value.
+//
+BH1750_STATUS bh1750_reset(BH1750* bh1750) {
+    UNUSED(bh1750);
+    uint8_t command = 0x07;
+    bool status;
+
+    furi_hal_i2c_acquire(I2C_BUS);
+    status = furi_hal_i2c_tx(I2C_BUS, BH1750_ADDRESS, &command, 1, I2C_TIMEOUT);
+    furi_hal_i2c_release(I2C_BUS);
+
+    if(status) {
+        return BH1750_OK;
+    }
+
+    return BH1750_ERROR;
+}
+
+//
+//	Set the power state.
+//	0 - sleep, low power.
+//	1 - running.
+//
+BH1750_STATUS bh1750_set_power_state(BH1750* bh1750, uint8_t PowerOn) {
+    UNUSED(bh1750);
+    PowerOn = (PowerOn ? 1 : 0);
+    bool status;
+
+    furi_hal_i2c_acquire(I2C_BUS);
+    status = furi_hal_i2c_tx(I2C_BUS, BH1750_ADDRESS, &PowerOn, 1, I2C_TIMEOUT);
+    furi_hal_i2c_release(I2C_BUS);
+
+    if(status) {
+        return BH1750_OK;
+    }
+
+    return BH1750_ERROR;
+}
+
+//
+//	Set the mode of converting. Look into bh1750_mode enum.
+//
+BH1750_STATUS bh1750_set_mode(BH1750* bh1750, BH1750_mode mode) {
+    if(!((mode >> 4) || (mode >> 5))) {
+        return BH1750_ERROR;
+    }
+
+    if((mode & 0x0F) > 3) {
+        return BH1750_ERROR;
+    }
+
+    bool status;
+
+    bh1750->mode = mode;
+
+    furi_hal_i2c_acquire(I2C_BUS);
+    status = furi_hal_i2c_tx(I2C_BUS, BH1750_ADDRESS, &mode, 1, I2C_TIMEOUT);
+    furi_hal_i2c_release(I2C_BUS);
+
+    if(status) {
+        return BH1750_OK;
+    }
+
+    return BH1750_ERROR;
+}
+
+//
+//	Set the Measurement Time register. It allows to increase or decrease the sensitivity.
+//
+BH1750_STATUS bh1750_set_mt_reg(BH1750* bh1750, uint8_t mt_reg) {
+    if(mt_reg < 31 || mt_reg > 254) {
+        return BH1750_ERROR;
+    }
+
+    bh1750->mt_reg = mt_reg;
+
+    uint8_t tmp[2];
+    bool status;
+
+    tmp[0] = (0x40 | (mt_reg >> 5));
+    tmp[1] = (0x60 | (mt_reg & 0x1F));
+
+    furi_hal_i2c_acquire(I2C_BUS);
+    status = furi_hal_i2c_tx(I2C_BUS, BH1750_ADDRESS, &tmp[0], 1, I2C_TIMEOUT);
+    furi_hal_i2c_release(I2C_BUS);
+    if(!status) {
+        return BH1750_ERROR;
+    }
+
+    furi_hal_i2c_acquire(I2C_BUS);
+    status = furi_hal_i2c_tx(I2C_BUS, BH1750_ADDRESS, &tmp[1], 1, I2C_TIMEOUT);
+    furi_hal_i2c_release(I2C_BUS);
+    if(status) {
+        return BH1750_OK;
+    }
+
+    return BH1750_ERROR;
+}
+
+//
+//	Trigger the conversion in manual modes.
+//	For low resolution conversion time is typical 16 ms,
+//	for high resolution 120 ms. You need to wait until read the measurement value.
+//	There is no need to exit low power mode for manual conversion. It makes automatically.
+//
+BH1750_STATUS bh1750_trigger_manual_conversion(BH1750* bh1750) {
+    if(BH1750_OK == bh1750_set_mode(bh1750, bh1750->mode)) {
+        return BH1750_OK;
+    }
+    return BH1750_ERROR;
+}
+
+//
+//	Read the converted value and calculate the result.
+//
+BH1750_STATUS bh1750_read_light(BH1750* bh1750, float* result) {
+    uint8_t mt_reg = bh1750->mt_reg;
+    BH1750_mode mode = bh1750->mode;
+    float result_tmp;
+    uint8_t rcv[2];
+    bool status;
+
+    furi_hal_i2c_acquire(I2C_BUS);
+    status = furi_hal_i2c_rx(I2C_BUS, BH1750_ADDRESS, rcv, 2, I2C_TIMEOUT);
+    furi_hal_i2c_release(I2C_BUS);
+
+    if(status) {
+        result_tmp = (rcv[0] << 8) | (rcv[1]);
+
+        if(mt_reg != BH1750_DEFAULT_MTREG) {
+            result_tmp *= (float)((uint8_t)BH1750_DEFAULT_MTREG / (float)mt_reg);
+        }
+
+        if(mode == ONETIME_HIGH_RES_MODE_2 || mode == CONTINUOUS_HIGH_RES_MODE_2) {
+            result_tmp /= 2.0;
+        }
+
+        *result = result_tmp / BH1750_CONVERSION_FACTOR;
+
+        return BH1750_OK;
+    }
+    return BH1750_ERROR;
+}

BH1750.h

@@ -0,0 +1,59 @@
+/*
+ * BH1750.h
+ *
+ *	The MIT License.
+ *  Created on: 06.11.2022
+ *      Author: Oleksii Kutuzov
+ *
+ *	Ported from:
+ *	https://github.com/lamik/Light_Sensors_STM32
+ */
+
+#include <furi.h>
+#include <furi_hal.h>
+
+#ifndef BH1750_H_
+#define BH1750_H_
+
+// I2C BUS
+#define I2C_BUS &furi_hal_i2c_handle_external
+#define I2C_TIMEOUT 10
+
+#define BH1750_ADDRESS (0x23 << 1)
+
+#define BH1750_POWER_DOWN 0x00
+#define BH1750_POWER_ON 0x01
+#define BH1750_RESET 0x07
+#define BH1750_DEFAULT_MTREG 69
+#define BH1750_DEFAULT_MODE ONETIME_HIGH_RES_MODE
+
+#define BH1750_CONVERSION_FACTOR 1.2
+
+typedef enum { BH1750_OK = 0, BH1750_ERROR = 1 } BH1750_STATUS;
+
+typedef enum {
+    CONTINUOUS_HIGH_RES_MODE = 0x10,
+    CONTINUOUS_HIGH_RES_MODE_2 = 0x11,
+    CONTINUOUS_LOW_RES_MODE = 0x13,
+    ONETIME_HIGH_RES_MODE = 0x20,
+    ONETIME_HIGH_RES_MODE_2 = 0x21,
+    ONETIME_LOW_RES_MODE = 0x23
+} BH1750_mode;
+
+typedef struct {
+    BH1750_mode mode;
+    uint8_t mt_reg;
+} BH1750;
+
+BH1750* bh1750_alloc();
+void bh1750_free(BH1750* bh1750);
+
+BH1750_STATUS bh1750_init(BH1750* bh1750);
+BH1750_STATUS bh1750_reset(BH1750* bh1750);
+BH1750_STATUS bh1750_set_power_state(BH1750* bh1750, uint8_t PowerOn);
+BH1750_STATUS bh1750_set_mt_reg(BH1750* bh1750, uint8_t MTreg);
+BH1750_STATUS bh1750_set_mode(BH1750* bh1750, BH1750_mode Mode);
+BH1750_STATUS bh1750_trigger_manual_conversion(BH1750* bh1750);
+BH1750_STATUS bh1750_read_light(BH1750* bh1750, float* Result);
+
+#endif /* BH1750_H_ */