Hi,
I have tried to generate the Checksum using Linker file and using Software calculation(Fast and Slow 16bit CRC). I used Polynomial as 0X11021 and 0X1021. But the linker CRC and the Software CRC is not matching. I want to know how the linker is calculating the Checksum. is it calculating the checksum for entire memory location(CODE=8002-FFDF, INTVEC=FFE0-FFFF, RESET=FFFE-FFFF), since I am placing the checksum in the beginning -Z(CONST)CHECKSUM=8000-8001.
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Since my ROM memory range is from 8000-FFFF
-Z(CONST)DATA16_C,DATA16_ID,TLS16_ID,DIFUNCT=8002-FFDF-Z(CONST)CHECKSUM=8000-8001// Placing the Checksum at the beginning
-Z(CODE)INTVEC=FFE0-FFFF-Z(CODE)RESET=FFFE-FFFF
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I have tried like the example code given in www.iar.com/.../ link also
And i have called the function for both slow and fast like mentioned below,
unsigned short sum=0;
sum = fast_crc16(sum,(unsigned char *)0x8002, 0xFFDF-0x8002+1);sum = fast_crc16(sum,(unsigned char *)0xFFFE, 2);
sum = fast_crc16(sum,(unsigned char *)0x8002, 0xFFFF-0x8002+1);
sum = fast_crc16(sum,(unsigned char *)0x8002, 0xFFDF-0x8002+1);
sum = fast_crc16(sum,(unsigned char *)0x8002, 0xFFDF-0x8002+1);sum = fast_crc16(sum,(unsigned char *)0xFFE0, 0xFFE0-0xFFFD+1);sum = fast_crc16(sum,(unsigned char *)0xFFFE, 2);
sum = fast_crc16(sum,(unsigned char *)0x8002, 0xFFDF-0x8002+1);sum = fast_crc16(sum,(unsigned char *)0xFFE0, 0xFFE0-0xFFFF+1);
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The linker generating CRC and the software generating CRC is not getting match. I need support regarding this issue.
Regards,
Benita.C