处理溢出
时间：2010-07-26 来源：huashan358
手段一
int main( void )
{
unsigned char cur = 10;
unsigned char old = 250;
unsigned char result;
if( cur >= old ) { result = cur -old; } else { result = (0xff - old) + cur; } }
手段二，调用内核函数 time_before, time_sfter
if( cur >= old ) { result = cur -old; } else { result = (0xff - old) + cur; } }
手段二，调用内核函数 time_before, time_sfter
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