最近由于项目需要,需要将BCD编码转换为对应的字符串,下面为C语言实现,经测试好用!
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/*BCD 与 ASCII码转换*/ /******************************************************************* 函数名: asc2bcd 功能描述:将ascii码转换为bcd码 参数: bcd:转换后的BCD码 asc:需转换的ASCII码串 len:需转换的ascii码串长度 返回值: uint32 0:成功 其他:失败 ********************************************************************/ uint32 asc2bcd(uint8* bcd, const uint8* asc, uint32 len); /******************************************************************* 函数名: bcd2asc 功能描述:将bcd码转换为ascii码串 参数: asc:转换的ASCII码串 bcd:需转换的BCD码 len:需转换的BCD码长度 返回值: uint32 0:成功 其他:失败 ********************************************************************/ uint32 bcd2asc(uint8* asc, const uint8* bcd, uint32 len);
#include <assert.h> #include "utils.h" //基于查表实现BCD与Ascii之间的转换 static uint8 bcd2ascii[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'}; static uint8 ascii2bcd1[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; static uint8 ascii2bcd2[6] = {0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F};
uint32 ASC2BCD(uint8 *bcd, const uint8 *asc, uint32 len) { uint8 c = 0; uint8 index = 0; uint8 i = 0; len >>= 1; for(; i < len; i++) { //first BCD if(*asc >= 'A' && *asc <= 'F') { index = *asc - 'A'; c = ascii2bcd2[index] << 4; } else if(*asc >= '0' && *asc <= '9') { index = *asc - '0'; c = ascii2bcd1[index] << 4; } asc++; //second BCD if(*asc >= 'A' && *asc <= 'F') { index = *asc - 'A'; c |= ascii2bcd2[index]; } else if(*asc >= '0' && *asc <= '9') { index = *asc - '0'; c |= ascii2bcd1[index]; } asc++; *bcd++ = c; } return 0; }
uint32 BCD2ASC (uint8 *asc, const uint8 *bcd, uint32 len) { uint8 c = 0; uint8 i; for(i = 0; i < len; i++) { //first BCD c = *bcd >> 4; *asc++ = bcd2ascii[c]; //second c = *bcd & 0x0f; *asc++ = bcd2ascii[c]; bcd++; } return 0; }
int main(void)//测试程序 { const unsigned char ascii[12] = {'1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C'}; unsigned char bcd[6]; ASC2BCD(bcd, ascii, 12, 0); int i = 0; printf("ascii = %s\n", ascii); for(; i < 6; i++) { printf("bcd = 0x%.2x\n", bcd[i]); } /* unsigned char ascii[13] = {0}; const unsigned char bcd[6] = {0x01, 0x23, 0x45, 0xCD, 0xEF, 0xAB}; BCD2ASC(ascii, bcd, 6, 0); printf("ascii = %s\n", ascii); */ return 0; }
原文地址:http://blog.csdn.net/lhl_blog/article/details/39496255