1.【C語言實踐之】協議拼包

協議包是各個通信協議所基本的結構組成。常會用到C語言的指針和數組等數據結構。

下面將用實例簡易實現下面十六進制的拼包流程：

7979001e9c0731323334080808080868656c6c6f776f726c640000000008000023620d0a

 

1.static kal_uint16 DataPacketEncode79(kal_uint8 cmd, kal_uint8 *sendData, kal_uint16 len)

實現79協議包頭的封裝

2.kal_uint16 GetCrc16(const kal_uint8* pData, int nLength)

協議包的CRC校驗

3.常用的數據類型

/* portable 8-bit unsigned integer */
typedef unsigned char           kal_uint8;
/* portable 8-bit signed integer */
typedef signed char             kal_int8;
/* portable 16-bit unsigned integer */
typedef unsigned short int      kal_uint16;
/* portable 16-bit signed integer */
typedef signed short int        kal_int16;
/* portable 32-bit unsigned integer */
typedef unsigned int            kal_uint32;
/* portable 32-bit signed integer */
typedef signed int              kal_int32;

4.//拼包的具體函數

void track_cust_paket_bbi(kal_uint32 timeshot,debug_type **de,kal_uint8 num)

具體的code如下：

/******************************************************************************
 *  Function    -  packet.c
 *
 *  Purpose     -  協議拼包example
 *
 *  Description -  NULL
 *
 *  modification history
 * ----------------------------------------
 *                                  mature writern
 * ----------------------------------------
*******************************************************************************/

#include "stdio.h"
#include "stdlib.h"
#include "string.h"

/* portable 8-bit unsigned integer */
typedef unsigned char           kal_uint8;
/* portable 8-bit signed integer */
typedef signed char             kal_int8;
/* portable 16-bit unsigned integer */
typedef unsigned short int      kal_uint16;
/* portable 16-bit signed integer */
typedef signed short int        kal_int16;
/* portable 32-bit unsigned integer */
typedef unsigned int            kal_uint32;
/* portable 32-bit signed integer */
typedef signed int              kal_int32;




typedef struct
	{
		kal_uint8 sn;
		kal_uint8 ubi_on;
		kal_uint8 ubi_kind;
		kal_int8 ubi_A;
		kal_int8 ubi_B;
		kal_int16 ubi_data[7];
		kal_uint8 ins_flag;
	}debug_type;



static kal_uint16 g_SerialNumber = 0;
kal_uint32 TIME_SHOT =12345678;


const static kal_uint16 crctab16[] =
{
    0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
    0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
    0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
    0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
    0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
    0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
    0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
    0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
    0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
    0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
    0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
    0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
    0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
    0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
    0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
    0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
    0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
    0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
    0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
    0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
    0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
    0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
    0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
    0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
    0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
    0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
    0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
    0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
    0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
    0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
    0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
    0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};



/******************************************************************************
 *  Function    -  getSerialNumber
 *
 *  Purpose     -  
 *
 *  Description -  NULL
 *
 *  modification history
 * ----------------------------------------
 * ----------------------------------------
*******************************************************************************/
static kal_uint16 getSerialNumber()
{
    return g_SerialNumber++;
}

/******************************************************************************
 *  Function    -  GetCrc16
 *
 *  Purpose     -  計算給定長度數據的16位CRC
 *
 *  Description -
 *
 *  modification history
 * ----------------------------------------
 * ----------------------------------------
*******************************************************************************/
kal_uint16 GetCrc16(const kal_uint8* pData, int nLength)
{
    kal_uint16 fcs = 0xffff;    // 初始化
    //kal_uint8 tmp;
    while(nLength>0)
    {
        fcs = (fcs >> 8) ^ crctab16[(fcs ^ *pData) & 0xff];
        nLength--;
        pData++;
    }
    return ~fcs;
}




/******************************************************************************
 *  Function    -  DataPacking
 *
 *  Purpose     -  79拼包
 *
 *  Description -  NULL
 *
 *  modification history
 * ----------------------------------------
 * ----------------------------------------
*******************************************************************************/
static kal_uint16 DataPacketEncode79(kal_uint8 cmd, kal_uint8 *sendData, kal_uint16 len)
{
    kal_uint16 tmp;

    //起始位
    sendData[0] = 0x79;
    sendData[1] = 0x79;

	printf("[0]%x\n",sendData[0]);

    //長度
    sendData[2] = ((len - 6) & 0xFF00) >> 8;
    sendData[3] = ((len - 6) & 0x00FF);

	printf("[2][3]%.2x%.2x\n",sendData[2],sendData[3]);  //001e

    //協議號
    sendData[4] = cmd;

	printf("[4]%x\n",sendData[4]);

    //信息序列號
    tmp = getSerialNumber();
    sendData[len - 6] = (tmp & 0xFF00) >> 8;
    sendData[len - 5] = (tmp & 0x00FF);
    printf("SerialNumber:%.2X%.2X", sendData[len - 6], sendData[len - 5]);

    //CRC校驗
    tmp = GetCrc16(&sendData[2], len - 6);
    sendData[len - 4] = (tmp & 0xFF00) >> 8;
    sendData[len - 3] = (tmp & 0x00FF);

    //結束
    sendData[len - 2] = '\r';
    sendData[len - 1] = '\n';

    return tmp;
}



void track_cust_paket_bbi(kal_uint32 timeshot,debug_type **de,kal_uint8 num)
{
	    kal_uint8 *sendData=0;
		char time[16];
		debug_type *bypass=0;
		kal_uint16 no=0;
		int size= 0;
		int count=0;
		int car;
		//sendData = (kal_uint8*)calloc(5,size);
		sendData = (kal_uint8*)malloc(sizeof(kal_uint8)*50); //分配足夠大的內存
	
		if(de == NULL)
		{
		printf(" cannot malloc de\n");
		}

		printf(" memory ok!\n");
	    bypass=*de;   //success zl very important

		printf("ubi_sn =%x\n", bypass[0].sn);
		printf("ubi_kind =%x\n", bypass[0].ubi_kind);
		printf("ubi_data =%x\n", bypass[0].ubi_on);
		printf("ubi_data =%s\n", bypass[0].ubi_data);
		
		

		size = num *20 + 16;
		
		sendData[5] =0x07;//慣導協議
		_itoa_s(timeshot,time,16,10);  //轉換
		memcpy(&sendData[6],time,4); //4+20*N(1-30秒)

		sendData[10] = bypass[0].sn;
		sendData[11] = bypass[0].ubi_on;
		sendData[12] = bypass[0].ubi_kind;
		sendData[13] = bypass[0].ubi_A;
		sendData[14] = bypass[0].ubi_B;
		memcpy(&sendData[15],bypass[0].ubi_data,14);
		sendData[29] = bypass[0].ins_flag;


		printf(" size ok!%d\n",size);
		printf("%x\n",sendData[5]);  
        printf("%x\n",sendData[6]);  //12345678
        printf("%x\n",sendData[7]);
        printf("%x\n",sendData[8]);
        printf("%x\n",sendData[9]);
		printf("ubi_sn =%x\n", sendData[10]);
		printf("ubi_on =%x\n", sendData[11]);
		printf("ubi_kind =%x\n", sendData[12]);
		printf("ubi_A =%x\n", sendData[13]);
		printf("ubi_B =%x\n", sendData[14]);
		printf("ins_flag =%x\n", sendData[29]);

		printf("end");

		no = DataPacketEncode79(0x9C, sendData, size);
		printf("num%d\n",num);
		printf("UBI packet:\n");
		for(car=0;car<size;car++)
		{
			printf("%.2x",sendData[car]);
		}
		
		printf("\n");
        printf("no =%d\n",no);
		free(sendData);
}	




int main()
{
		debug_type *params2[30]={0};

	    debug_type params[30]={0};
		kal_uint8 number=1;  //傳一次透傳數據
		char *ptr ="helloworld";
		params[0].sn=8;
		params[0].ubi_kind=8;
		params[0].ins_flag=8;
		params[0].ubi_on=8;
		params[0].ubi_A=8;
		params[0].ubi_B=8;
		memcpy(params[0].ubi_data,ptr,strlen(ptr));
		params2[0]=&params[0];
;
		printf("ubi_on =%d\n", params2[0]->sn);
		printf("ubi_kind =%d\n", params2[0]->ubi_kind);
		printf("ubi_data =%s\n", params2[0]->ubi_data);


		//track_cust_paket_ubi(TIME_SHOT, (debug_type**)&params2,number);
		track_cust_paket_ubi(TIME_SHOT, &params2[0],number); //success

}