51单片机串口检测程序

liyf

＃i nclude "reg51_STC.H"
#define uchar unsigned char
#define uint unsigned int

//--------------------------------------------------------------------------
//函数名称:????? UART_Init()
//函数功能:????? 串口初始化函数,在系统时钟为11.059MHZ时，设定串口波特率为9600bit/s
//其他说明:????? 串口接收中断允许，发送中断禁止
//--------------------------------------------------------------------------

void UART_Init(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 = 0xFA ; //Baud:9600 fosc="11".0592MHz?
ES=1;
TR1 = 1 ;??? // timer 1 run?
EA=1;
}


//--------------------------------------------------------------------------
//函数名称:????? main(void)
//函数功能:????? 主函数
//其他说明:????? 无
//--------------------------------------------------------------------------

void main(void)
{
UART_Init();
while(1);
}


//--------------------------------------------------------------------------
//函数名称:????? Uart_SendData()
//函数功能:????? 串口发送一个字节的数据
//其他说明:????? 此程序供中断调用
//--------------------------------------------------------------------------

void Uart_SendData(uchar dat)
{
SBUF=dat; //写SBUF，开始发送
while(TI==0); //等待发送
TI="0";?? //清发送标志位?
}


//--------------------------------------------------------------------------
//函数名称:????? INT_UartRcv()
//函数功能:????? 串口接收中断函数
//其他说明:????? 无
//--------------------------------------------------------------------------

void INT_UartRcv(void) interrupt 4
{
uchar Rcv;
if(RI)
{
RI=0;???? //
Rcv=SBUF;
Uart_SendData(Rcv); //返回接收数据,可以改为其他函数?
}
}
NO。2
＃i nclude
＃i nclude
#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?
??EA=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
}

//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);?
??} ???????
?}
}