简单得ascii码与十六进制互转

最新推荐文章于 2025-07-13 09:58:59 发布

Huang_X_X

最新推荐文章于 2025-07-13 09:58:59 发布

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分类专栏：软件文章标签： byte function numbers

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本文介绍了两个实用的函数：一个用于将8位数值转换为其对应的ASCII值；另一个用于将ASCII表示的十六进制数值转换回其原始的十六进制形式。这些函数对于处理和显示二进制数据特别有用。

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/*
** This function converts a 8 bit number to its ASCII equivalent value.
** The 8 bit number is passed as a parameter to this function.
*/

static unsigned int intToASCII(unsigned char byte)
{
    unsigned int retVal = 0;
    unsigned char lsn = 0, msn = 0;
    lsn = (byte & 0x0F);
    msn = (byte & 0xF0) >> 0x04;

retVal = (lsn + 0x30);
retVal |= ((msn + 0x30) << 0x08);

return retVal;
}

/*
** This function converts the ASCII value of a hexadecimal number to its
** equivalent hexadecimal value.
*/

static unsigned char ASCIIToInt(unsigned char byte)
{
unsigned char retVal = 0;

    /* For numbers from 0x0 to 0x9.*/
    if((byte >= 0x30) && (byte <= 0x39))
    {
        retVal = byte - 0x30;
    }
    /* For alphabets from A to Z.*/
    else if((byte >= 0x41) && (byte <= 0x46))
    {
        retVal = byte - 0x37;
    }

    return retVal;
}