这个重定义就好哇
#if 1
#define printf(...) vcom_Send(__VA_ARGS__)
#else
#define printf(...)
#endif
void vcom_Send( char *format, ... )
{
va_list args;
uint16_t count = 0;
va_start(args, format);
count = vsprintf(&buff[0], format, args);
Porting_Uart_Send(buff, count);
va_end(args);
}