ASCII码转HEX与HEX转ASCII码

【1】ASCII码转HEX

ASCII码转HEX：
【1】 ASCII码:0-9 --> HEX:0x0-0x9 --> Dec:0-9
【2】ASCII码:a/A-f/F --> HEX:0xA-0xF --> Dec:10-15

//ASCII码转HEX：
//ASCII码:0-9 --> HEX:0x0-0x9 --> Dec:0-9
//ASCII码:a/A-f/F --> HEX:0xA-0xF --> Dec:10-15
uint8_t AsciiToHex(uint8_t Ascii_Byte)
{	
	//DebugPrintf("\r\n Input ascii data:%c = Dec%d = 0X%02X",Ascii_Byte,Ascii_Byte,Ascii_Byte);
    if (Ascii_Byte & 0x80) return Ascii_Byte;//=0
    
	if( (Ascii_Byte >= '0')&&(Ascii_Byte <= '9') )
	{
		return Ascii_Byte - '0'; //0-9
	}
	else if( (Ascii_Byte >= 'a')&&(Ascii_Byte <= 'f') )
	{
		return Ascii_Byte - 'a' + 10; //10-15
	}
	else if( (Ascii_Byte >= 'A')&&(Ascii_Byte <= 'F') )
	{
		return Ascii_Byte - 'A' + 10; //10-15
	}
    
	return Ascii_Byte;
}

【2】HEX转ASCII码

HEX转ASCII码：
【1】HEX:0x0-0x9 --> ASCII码:0-9 --> Dec:0-9
【2】HEX:0xa-0xf --> ASCII码:A-F --> Dec:10-15

//HEX转ASCII码：
//HEX:0x0-0x9 --> ASCII码:0-9 --> Dec:0-9
//HEX:0xa-0xf --> ASCII码:A-F --> Dec:10-15
char HexToAscii(uint8_t Hex_Byte)
{
	if( (Hex_Byte>=0)&&(Hex_Byte<=9) )            //变成ascii数字
		return Hex_Byte + 0x30;
	else if( (Hex_Byte >= 10)&&(Hex_Byte <= 15) ) //变成ascii大写字母
		return Hex_Byte + 0x37;
	else
		return 0xff;
}

【4】Qt实现ASCII码转HEX

quint8 datadef::Fun_ascii2hex(quint8 ascii)
{
    if (ascii & 0x80) return ascii;

    if (ascii >= '0' && ascii <= '9')
        return (ascii - '0');
    else if (ascii >= 'A' && ascii <= 'F')	//ascii表示16进制，只有0-9 A-F
        return (ascii - 'A' + 0x0A);
    else if (ascii >= 'a' && ascii <= 'f')
        return (ascii - 'a' + 0x0A);
    return ascii;
}

【4】Qt实现HEX转ASCII码

quint8 datadef::Fun_hex2ascii(quint8 hex)
{
    if (hex >= 0x00 && hex <= 0x09)
        return (hex + '0');	//'0'=0x30
    else if (hex >= 0x0A && hex <= 0x0F)
        return (hex - 0x0A + 'A');//强制大写
    return 0;
}

void datadef::Fun_u8Hex2ascii(quint8 hex, quint8 *ascii_buff)
{
    *ascii_buff = Fun_hex2ascii((hex >> 4) & 0x0F);
    *(ascii_buff + 1) = Fun_hex2ascii(hex & 0x0F);
}

void datadef::Fun_u16Hex2ascii(quint16 hex, quint8 *ascii_buff)
{
    quint8 i = 0;
    for (i = 0; i < 4; i++)
    {
        *(ascii_buff + 3 - i) = Fun_hex2ascii((hex >> (4*i)) & 0x000f);
    }
}