- /*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;
- }