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BQ27421 I2C confusion

George Phillip Orais
Prodigy 10 points

Hi everyone,

Could someone please help me provide me a small code snippet on reading the Device Type using the Control command and its sub-command? Also for putting the device to Shutdown? or even a detailed pseudo code is fine with me.

Sorry for asking like this, its just i already tried almost all i can do but still i can't get the expected result. For Voltage reading, Temperature reading and the rest, is already OK.

Thanks in advance.

- Geo

  • 0
    Intellectual 450 points

    int i2cwrite( char i2c_address, char command, char * data, int length );

    int i2cread( char i2c_address, char command, char * data, int length );

     

    // reading device type:

    i2cwrite( 0x55, 0x00, (char[]){0x01,0x00}, 2); // Control(DEVICE_TYPE)

    char buffer[2];

    i2cread( 0x55, 0x00, buffer, 2); // Now read 

    unsigned short device_type = buffer[0] + (buffer[1] << 8);

    // Putting in shutdown:

    i2cwrite( 0x55, 0x00, (char[]){0x1B,0x00}, 2); // Control(SHUTDOWN_ENABLE)

    i2cwrite( 0x55, 0x00, (char[]){0x1C,0x00}, 2); // Control(SHUTDOWN)

    // What about Temperature():

    char buffer[2];

    i2cread( 0x55, 0x02, buffer, 2);

    unsigned short temperature = buffer[0] + (buffer[1] << 8); // Remember to convert this value, because it's in deciKelvin

     

    // Or Voltage():

    char buffer[2];

    i2cread( 0x55, 0x04, buffer, 2);

    unsigned short voltage = buffer[0] + (buffer[1] << 8); // in mV