AIS2120 Accelerometer Sensor

[Yz2]

I'm encountering many issues while using the AIS2120 accelerometer sensor and would greatly appreciate your assistance. Thank you very much!

1. After the sensor is powered on, a series of initializations (default configuration) are performed, then it enters normal mode, and then the corresponding acceleration data is read. Are these actions performed automatically by the sensor?Do I need to perform any operations to make the sensor enter normal mode?
2. If I need to set it to 1600Hz, how should I operate? (I tried setting a soft reset and then writing to the configuration register, but it didn't work).
3. I keep having communication issues, especially I'm not sure if the CRC check is correct. The manual is very vague. Attached is my CRC check function.
4. I'm also unsure how to fill in the position indicating whether it is sensor data in the SDI frame.

uint8_t AIS1120SX_ubCrcVal(int32u ulCrcVal) {
    uint8_t crc = 0x00;
    uint8_t poly = 0x97;

    for (uint8_t i = 0; i < 4; i++)
    {
        crc ^= (uint8_t) ((ulCrcVal >> (i * 8)));

        for (uint8_t b = 0; b < 8; b++)
        {
            if (crc & 0x80)
            {
                crc = (uint8_t) ((crc << 1) ^ poly);
            }
            else
            {
                crc <<= 1;
            }
        }
    }

    return crc;
}​

[Yz2]

The above is the entire process.

1.I'm not sure if the sensor automatically enters normal mode after power-on.

2.I need to modify FIR_BW. How should I do it?

[Yz2]

@Federica Bossi 
Could you offer me some suggestions? Thank you very much.

[Yz2]

@TDK