rs232_getchar.c

来自「s1mp3 sdk, action mp3 develop tool kit!」· C语言 代码 · 共 25 行

#include "drivers\rs232.h"

extern port_info_s port_info[];

unsigned char RS232_Getchar( void )
{
	unsigned char c;	

	while (port_info->input_remove == port_info->input_insert)
	{
	    /* What should we do!?  be prepared for a lockup if we
	     * don't fix this
	     */
	}	

	c = port_info->input_buffer[port_info->input_remove++];
	port_info->input_remove &= RS232_BUFFERMASK;

	return (c);
}