MSPBSL: What is the correct way to determine the CRC checksum

Hello Philippe,
the "address" is the start address of the section to be programmed, the "length" is the number of bytes of the to be programmed block.
The CRC algorithm used, is the same as the one of the MSP430 CRC module.

For CRC module, we have two types of register for the input register:
• CRCDI as CRC data in and
• CRCDIRB as CRC Data in Reverse Byte

In BSL communication we insert the input byte into the CRCDIRB_L instead of the CRCDI_L.

In PC side CRC is defined as 16bit data and initialized by 0xFFFF:

void Util::resetCrc()
{
crc = 0xFFFF;
}

void Util::checkSumCalculate(uint8_t data)
{
uint8_t x;
x = ((crc >> 8) ^ data) & 0xff;
x ^= x >> 4;
crc = (crc << 8) ^ (x << 12) ^ (x << 5) ^ x;
}

uint16_t Util::retCrc()
{
return crc;
}

Best regards
Peter

Hi Peter

Thank you very much for your thorough explanation. However I haven't planed to implement an own PC based program myself. I am just wondering what is the easiest way to determine "address", "length" and "expected checksum" for a give TXT/HEX file so that I can hand over these parameters to the BSL scripter. I am surprise if I would have to implement it myself. I assume some TI tool is able to do this?!

Thanks a lot for your help and best regards,
Philippe

Hello Philippe,
my apologies for my late response. I have been sick the last few days.
Coming back to your question on the tool, which would offer these parameters automatically, up to my information, with IAR, there would be a possibility in combination with the feature of creating a map file, to obtain information like that, but on the details, I would recommend you to a check this with support from IAR.
On TI side unfortunately we do not have such a feature. Sorry for that inconvenience.

Best regards
Peter