[pwc980]串口通信参数之计算CRC32

做PWC980芯片的串口通信时,需要测试,那么就需要给PWC980发串口命令,而命令参数中需要计算CRC32, 怎么办?

做了一个小小的C程序来计算CRC32值,并直接输出PWC980能接收的16进制字符串. 见代码:

#include <stdio.h>
#include <stdlib.h>

#include "windows.h"

#define CRC_HI      0xFF
#define CRC_LO      0xFF

#define MAX_LEN		0xFF

typedef unsigned char BYTE;
typedef unsigned char* PBYTE;
typedef unsigned short WORD;
typedef int INT;

static BYTE m_acCRCHiArray[] = {
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
    0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
    0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
    0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
    0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
    0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
    0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
};

static BYTE m_acCRCLoArray[] = {
    0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06,
    0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD,
    0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,
    0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A,
    0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4,
    0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
    0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3,
    0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4,
    0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A,
    0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29,
    0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED,
    0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
    0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60,
    0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67,
    0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F,
    0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68,
    0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E,
    0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
    0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71,
    0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92,
    0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C,
    0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B,
    0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B,
    0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
    0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42,
    0x43, 0x83, 0x41, 0x81, 0x80, 0x40
};

WORD utilCRC16Calc(PBYTE pacData,
                   INT  nCount)
{
    BYTE                cCRCHi = CRC_HI;    // high byte of CRC initialized
    BYTE                cCRCLo = CRC_LO;    // low byte of CRC initialized
    BYTE                cIndex;        // will index into CRC lookup table
    WORD                wCRC;

    // step through each byte of data
    while (nCount--)
    {
        cIndex = cCRCHi ^ *pacData++;  // calculate the CRC
        cCRCHi = cCRCLo ^ m_acCRCHiArray[cIndex];
        cCRCLo = m_acCRCLoArray[cIndex];
    }

    wCRC = (cCRCHi << 8) + cCRCLo;

    return wCRC;
}


int main(int argc, char *argv[])
{
	PBYTE input = NULL;
	BYTE temp;
	PBYTE p = NULL;
	PBYTE q = NULL;
	PBYTE num = NULL;
	PBYTE t = NULL;
	PBYTE output = NULL;
	PBYTE cvtInput = NULL;
	WORD crc32 = 0;
	BYTE choose;

begin:
	for(temp = 0; temp < 80; temp++ )
	{
		printf("-");
	}

	printf("PLEASE SPLIT YOUR DATA WITH SPACE.\r\n");

	for(temp = 0; temp < 80; temp++ )
	{
		printf("-");
	}

	input = (PBYTE)malloc(sizeof(BYTE)*MAX_LEN);
	if( NULL == input )
	{
		printf("can not allocate memory for input array.\r\n");
		return -1;
	}

	printf("INPUT YOUR DATA ARRAY: ");
	p = input;
	while( (temp = getchar()) != '\n' )
	{
		*p = temp;
		p++;
	}
	*p = '\0';

//	printf("input:\r\n");
//	p = input;
//	while( *p != '\0' )
//	{
//		printf(" 0x%02X ", *p++);
//	}
//	printf("\r\n");

	cvtInput = (PBYTE)malloc(sizeof(BYTE)*strlen(input));
	if( NULL == cvtInput )
	{
		printf("can not allocate memory for convert input array.\r\n");
		free( input );
		input = NULL;
		return -3;
	}

	p = input;
	q = cvtInput;
	num = (PBYTE)malloc(sizeof(BYTE)*7);
	if( NULL == num )
	{
		printf("can not allocate memory for convert input to number.\r\n");
		free( input );
		input = NULL;
		return -4;
	}
	t = num;
	while( *p != '\0' )
	{
		if( *p != 0x20 )
		{
			*t = *p;
			t++;
		}
		else
		{
			*t = '\0';
			if( atoi(num) > 0xff )
			{
				printf("*****there is a invalid data in your input array.\r\n");
			}
			*q = atoi(num);

			q++;
			
			memset( num, '\0', sizeof(BYTE)*7 );
			t = num;
		}

		p++;
	}
	// convert the last number
	*t = '\0';
	*q++ = atoi(num);
	*q = '\0';
	if( atoi(num) > 0xff )
	{
		printf("*****there is a invalid data in your input array.\r\n");
	}

	free( num );
	num = NULL;

//	q = cvtInput;
//	printf("cvtInput:\r\n");
//	while( *q != '\0' )
//	{
//		printf(" 0x%02X ", *q++);
//	}
//	printf("\r\n");
	
	// START1 START2 CMDTYPE DLEN1 DLEN2 CRC1 CRC2 CMDID DATA0 DATA1 ... DATAn
	output = (PBYTE)malloc(sizeof(BYTE)*(7+strlen(cvtInput)));
	if( NULL == output )
	{
		printf("can not allocate memory for output array.\r\n");
		free( input );
		input = NULL;
		free( cvtInput );
		cvtInput = NULL;
		return -2;
	}

	output[0] = 0xbe;
	output[1] = 0xef;
	output[2] = 0x27;
	output[3] = (strlen(cvtInput))&0xff;
	output[4] = (strlen(cvtInput)>>8)&0xff;
	output[5] = 0x00;
	output[6] = 0x00;
	strncpy( &output[7], cvtInput, strlen(cvtInput) );
	
	crc32 = utilCRC16Calc( output, 7+strlen(cvtInput) );
	output[5] = crc32&0xff;
	output[6] = (crc32>>8)&0xff;
	
	printf("OUTPUT:\r\n");
	printf("FORMAT 1:");
	for(temp = 0; temp < (7+strlen(cvtInput)); temp++)
	{
		printf(" 0x%02X ", output[temp]);
	}
	printf("\r\n");
	printf("FORMAT 2:");
	for(temp = 0; temp < (7+strlen(cvtInput)); temp++)
	{
		printf(" %02X ", output[temp]);
	}
	printf("\r\n");

	free( input );
	input = NULL;

	free( output );
	output = NULL;

	free( cvtInput );
	cvtInput = NULL;

	printf("CONTINUE? (Y/N) ");
	choose = getchar();
	getchar();
	if( choose == 'y' || choose == 'Y' )
	{
		goto begin;
	}

	return 1;
}