Compiler: crc_table value does not match

Other Parts Discussed in Thread: MSP430F2274, MSP-FET

Tool/software: TI C/C++ Compiler

Hi,

I've tried to use the crc_table function in the linker command file, but in the application I'm not able the calculate the same value as the Linker.

My development enviroment looks like:

Operating System: Windows 10 64Bit

CCS: 6.6.2

Compiler: TI MSP430 16.9.3 LTS

MCU: MSP430F2274

A snippet from the linker command file:

.TI.crctab : > FLASH
.cinit      : {} > FLASH,PAGE=0,crc_table(_crc_table_cinit )	
.const      : {} > FLASH,PAGE=0,crc_table(_crc_table_const )    
.text       : {} > FLASH,PAGE=0,crc_table(_crc_table_text ) 

In the application I'm using the crc functions which are described in the document slaa221.pdf :

// CRC16 g(x) = x^16+ x^12 + x^5 + 1 (CCITT-Polynom).
// CCITT = CRC16_802_15_4  
#define CRC16_802_15_4 1
#define CRC16_POLY	    0x1021
#define CRC16_INIT_REM      0x0
#define CRC16_FINAL_XOR     0x0

unsigned int CRC_CheckROM(CRC_TABLE *tp) {
	int i;
	unsigned int uiResult = 0;
	for (i = 0; i < tp->num_recs; i++) {
		CRC_RECORD crc_rec = tp->recs[i];
		if (crc_rec.crc_alg_ID == CRC16_802_15_4 )          // CRC_CCITT, CRC16_802_15_4 = 1
		{
			uint16_t uiCrc = 0;
			uint16_t uiExpCrc = (uint16_t)crc_rec.crc_value;  // expected checksum
			unsigned char * pData = (unsigned char *) crc_rec.addr;  // start address
			// calculate the current checksum
			uiCrc =  CRC_CalcCRC16(CRC16_INIT_REM, CRC16_POLY, pData , crc_rec.size);
			// Validate CRC Sum
			if (uiCrc == uiExpCrc)
			{
				uiResult = 1;                               // pass
			}
			else
			{
				uiResult = 0;                               // fail
			}
		}
	}
	return uiResult;
}
unsigned short CRC_CalcCRC16(unsigned short crc, unsigned short poly,
			     unsigned char *pmsg, unsigned int msg_size)
{

	unsigned int i, j;
	unsigned short msg;

	for(i = 0 ; i < msg_size ; i ++)
	{
		msg = (*pmsg++ << 8);
		for(j = 0 ; j < 8 ; j++)
		{
			if((msg ^ crc) >> 15) crc = (crc << 1) ^ poly;
			else crc <<= 1;
			msg <<= 1;
		}
	}
	return(crc ^ CRC16_FINAL_XOR);
}

I've implemted a table based crc function as well.

Here are my results:

.text section:

Linker: crc_value 0x00005A9E

Linker: crc_alg_ID 0x0001

Linker: addr 0x8000

Linker: size 0x1000

application:

16 Bit calculation bitwise: 0x1CBC

16 Bit table calculation: 0x1CBC

Where is my fault?

Kind regards,

Arne