C语言 16进制与ascii码互转

/*把ASCII字符转换为16进制 */

uint8_t char_to_hex(const uint8_t *ch)

{

uint8_t value = 0;

if(*ch >= 0 && *ch <= 9)

{

value = *ch + 0x30;

}

else if(*ch >=10 && *ch <=15)

{

// 大写字母

value = *ch + 0x37;

}

 

//printf("%s hex : 0x%02x\n", __func__, value);

return value;

}

/*把16进制转换为ASCII字符 */

uint8_t hex_to_char(const uint8_t ch)

{

uint8_t value = 0;

if(ch >= 0x30 && ch <=0x39)

{

value = ch - 0x30;

}

else if(ch >= 0x41 && ch <= 0x46)

{

value = ch - 0x37;

}

else if(ch >= 0x61 && ch <= 0x66)

{

value = ch - 0x57;

}

//printf("%s ascii : 0x%02x\n", __func__, value);

return value;

}