TPS2HCS10-Q1: CRC Implementation Details

Krishna,

So this will be updated in the latest version of the datasheet that will be available for RTM, but after CRC is enabled it will be 32-bit. Find the diagram below:

We don't have a reference sheet just yet, but can generate one if needed (it will take a few days).

Best Regards,
Tim 

Krishna,

I am working on this currently. Could you let me know what you want in the GUI, specifically? Right now I added a CRC button that, when enabled, will cause all writes to the high-side switch to have the extra CRC frame. It will also give you the CRC result when reading the the "Console" view. Would this be enough?

For what it's worth, I updated the function slightly from what Patrick implemented:

static uint8_t crcGetResult(uint8_t* dataBuffer, uint8_t len)
{
    uint8_t crc_start = 0x0F;
    uint8_t crc_polynomial = 0x03;
    uint8_t crc_result = crc_start;
    uint8_t bitnum = 0;
    uint8_t bytenum = 0; 

    for(bytenum = 0; bytenum < len; bytenum++)
    {
        for(bitnum = 0; bitnum < 8; bitnum++)
        {
            if((((dataBuffer[bytenum] >> (7-bitnum)) & 0x01) ^ 
                   ((crc_result & 0x08) >> 3)) > 0)
            {
                crc_result = crc_polynomial ^ ((crc_result << 1) & 0x0F);
            }
            else
            {
                crc_result = (crc_result << 1) & 0x0F;
            }
        }
    }

    for(bitnum = 0; bitnum < 4; bitnum++)
    {
        if(((crc_result & 0x08) >> 3) > 0)
        {
            crc_result = crc_polynomial ^ ((crc_result << 1) & 0x0F);
        }
        else
        {
            crc_result = (crc_result << 1) & 0x0F;
        }
    }
  
    return (crc_result);
}

This is just plain C code and should be able to be compiled under any host (GCC, Windows, etc.). 

Best Regards,
Tim 

Hi Tim,

Thanks For the response, Was able to communicate with the Chip, with CRC option is enabled, Trick is here, Micro we use is Little Endian Format, i have to swap the bytes

Was looking for the reference sheet to match the CRC calculation done in the software is same as the reference sheet.

Thanks,

Krishna