New data is never available

[Makodan]

Hello!

I have an interesting problem. I tried to port the driver onto STM32 board. I rewrote the mlx90640_i2c_driver.

With my code, I can dump calibration data, then extract the parameters, and them seem correct. But the "MLX90640_GetFrameData" always stuck in a while loop, because the status register's data ready bit will never be 1.

    paramsMLX90640 sensor_params;
    static uint16_t eeData[832];
    static uint16_t mlx90640Frame[834];
    static float32_t pixels[768];

    HAL_Delay(5000);

//Tried with another resolution, refresh-rate too

    MLX90640_DumpEE(MLX90640_ADDR,eeData);
    MLX90640_ExtractParameters(eeData,&sensor_params);

    MLX90640_GetFrameData(MLX90640_ADDR,mlx90640Frame);    // stuck here
    MLX90640_CalculateTo(mlx90640Frame,&sensor_params,1,1,pixels);

In debug mode I can clearly see that the status register is always 0x0900.

I tried to solve it with direct register writings:

//initializations etc...

    if(StartMeasTempSensor() != 0){
        Error_Handler();
    }
    HAL_Delay(5000);
    while(!CheckTempSensor()){ }      // stuck here

int StartMeasTempSensor(){

    uint16_t status_register;
    uint16_t control_register;
    int error  = 0;

    //Set control register
    error += MLX90640_I2CRead(MLX90640_ADDR,0x800D,1,&control_register);
    control_register = (control_register & 0xE000) | 0x1901;
    error += MLX90640_I2CWrite(MLX90640_ADDR,0x800D,control_register);

    //Set status register
    error += MLX90640_I2CRead(MLX90640_ADDR,0x8000,1,&status_register);
    status_register = (status_register & 0xFFC0) | 0x0030;
    MLX90640_I2CWrite(MLX90640_ADDR,0x8000,status_register);

    return error;
}

int CheckTempSensor(){

    uint16_t status_register;
    uint16_t control_register;

    MLX90640_I2CRead(MLX90640_ADDR,0x800D,1,&control_register);
    MLX90640_I2CRead(MLX90640_ADDR,0x8000,1,&status_register);

    //Data ready
    if((status_register & 0x0008) > 0){
        return 1;
    }
    else{

        if((status_register & 0x0020) == 0){
            status_register = (status_register & 0xFFC0) | 0x0020;
            MLX90640_I2CWrite(MLX90640_ADDR,0x8000,status_register);

        }
        return 0;
    }

}

I noticed another interesting thing, if I write the control register, I can read back the correct value (e.g. 0x1901), so I think I2C communication is OK. But if I write the status register (e.g. 0x0930), I always read back 0x0900. I have two senors, but both produce this (error). Do you have any idea? Thanks

Edit: If I write 0x0901 to control register, i read out 0x0800 from the status register, I don't write to the status register, but new data never comes.

[Makodan]

Solution: https://github.com/melexis/mlx90640-library/issues/12