参考.c

STC单片机读取FPGA筒形寄存器并通过RS232发送到上位机源程序

#include <reg51.h>
#include <string.h>
#define INBUF_LEN 4 //数据长度

unsigned char inbuf1[INBUF_LEN];
unsigned char CHECKSUM,count3;
bit read_flag= 0 ;

void init_serialcomm( void )
{
   	SCON = 0x50 ; 	//SCON: serail mode 1, 8-bit UART, enable ucvr
   	TMOD |= 0x20 ; 	//TMOD: timer 1, mode 2, 8-bit reload
   	PCON |= 0x80 ; 	//SMOD=1;
   	TH1 = 0xF4 ; 	//Baud:4800 fosc=11.0592MHz
   	IE |= 0x90 ; 	//Enable Serial Interrupt
   	TR1 = 1 ; 	// timer 1 run
    			// TI=1;
}
    //向串口发送一个字符
void send_char_com( unsigned char ch)
{
	SBUF=ch;
   	while (TI== 0 );
   	TI= 0 ;
}
    //向串口发送一个字符串，strlen为该字符串长度
void send_string_com( unsigned char *str, unsigned int strlen)
{
	unsigned int k= 0 ;
	do
	{
		send_char_com(*(str + k));
		k++;
    	}
	while (k < strlen);
}
    
    //串口接收中断函数
void serial () interrupt 4 using 3
{
	if (RI)
	{
		unsigned char ch;
		RI = 0 ;
		ch=SBUF;
		if (ch>127)
		{
			count3= 0 ;
			inbuf1[count3]=ch;
			CHECKSUM= ch- 128 ;
    		}
   		else
    		{
			count3++;
			inbuf1[count3]=ch;
			CHECKSUM ^= ch;
			if ( (count3==(INBUF_LEN- 1 )) && (!CHECKSUM) )
    			{
				read_flag= 1 ; //如果串口接收的数据达到INBUF_LEN个，且校验没错，
				//就置位取数标志
			}
		}
	}
}
main()
{
	init_serialcomm(); //初始化串口
	while ( 1 )
	{
		if (read_flag) //如果取数标志已置位，就将读到的数从串口发出
		{
			read_flag= 0 ; //取数标志清0
			send_string_com(inbuf1,INBUF_LEN);
		}
	}
}