STM32中整型數和字符的相互轉換

//整形轉字符，stm32不支持標準的itoa,這裏自己實現
char *myitoa(int value, char *string, int radix)
{
    int     i, d;
    int     flag = 0;
    char    *ptr = string;

    /* This implementation only works for decimal numbers. */
    if (radix != 10)
    {
        *ptr = 0;
        return string;
    }

    if (!value)
    {
        *ptr++ = 0x30;
        *ptr = 0;
        return string;
    }

    /* if this is a negative value insert the minus sign. */
    if (value < 0)
    {
        *ptr++ = '-';

        /* Make the value positive. */
        value *= -1;
    }

    for (i = 10000; i > 0; i /= 10)
    {
        d = value / i;

        if (d || flag)
        {
            *ptr++ = (char)(d + 0x30);
            value -= (d * i);
            flag = 1;
        }
    }

    /* Null terminate the string. */
    *ptr = 0;

    return string;

} /* NCL_Itoa */

//字符串轉整形，stm32不支持標準的atoi,這裏自己實現
int myatoi(const char *str)
{
	int s=0;
	uint8_t falg=0;
	
	while(*str==' ')
	{
		str++;
	}

	if(*str=='-'||*str=='+')
	{
		if(*str=='-')
		falg=1;
		str++;
	}

	while(*str>='0'&&*str<='9')
	{
		s=s*10+*str-'0';
		str++;
		if(s<0)
		{
			s=2147483647;
			break;
		}
	}
	return s*(falg?-1:1);
}