mirror of
https://github.com/DarkFlippers/unleashed-firmware
synced 2024-12-26 12:43:08 +00:00
27 lines
1,016 B
C
27 lines
1,016 B
C
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#include <MAX44009.h>
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#include <math.h>
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#include <furi.h>
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void max44009_init() {
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furi_hal_i2c_acquire(I2C_BUS);
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furi_hal_i2c_write_reg_8(I2C_BUS, MAX44009_ADDR,
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MAX44009_REG_CONFIG, MAX44009_REG_CONFIG_CONT_MODE, I2C_TIMEOUT);
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furi_hal_i2c_release(I2C_BUS);
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}
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int max44009_read_light(float* result) {
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uint8_t data_one = 0;
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uint8_t exp, mantissa;
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int status;
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furi_hal_i2c_acquire(I2C_BUS);
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furi_hal_i2c_read_reg_8(I2C_BUS, MAX44009_ADDR, MAX44009_REG_LUX_HI, &data_one, I2C_TIMEOUT);
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exp = (data_one & MAX44009_REG_LUX_HI_EXP_MASK) >> 4;
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mantissa = (data_one & MAX44009_REG_LUX_HI_MANT_HI_MASK) << 4;
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status = furi_hal_i2c_read_reg_8(I2C_BUS, MAX44009_ADDR, MAX44009_REG_LUX_LO, &data_one, I2C_TIMEOUT);
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mantissa |= (data_one & MAX44009_REG_LUX_LO_MANT_LO_MASK);
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furi_hal_i2c_release(I2C_BUS);
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*result = (float)pow(2, exp) * mantissa * 0.045;
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FURI_LOG_D("MAX44009", "exp %d, mant %d, lux %f", exp, mantissa, (double)*result);
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return status;
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}
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