C8051F020编程UART串口收发数据

我编了一个 老是编译不过去 求高手改正

我用的是UART0端口 方式2

程序如下

//>>UART0串口编程--向PC发送和接受字符串<<

//

//--------------------------------------------------------------------------

#include

#include

#define uchar unsigned char

#define uint unsigned int

//----------------------------------------------------------------------

//参数设置区

//----------------------------------------------------------------------

#define BAUDRATE 138240 //波特率bps

#define SYSCLK 22118400 //外部晶振,修改也要修改OSCXCN

#define T4VAL (65536-SYSCLK/BAUDRATE/32) //定时器4初值

uchar idata reaeice_flag=0;

extern uchar idata timer_sec;

uchar idata send_buffer[10]; //数据缓冲区

uchar idata receive_buffer[20];//接收数据队列

uchar time = 0; //软件计时次数

uchar period = 25; //定时间隔 20ms * 25 =500ms

//----------------------------------------------------------------------

//子函数声明

//----------------------------------------------------------------------

void SYSCLK_Init(void); //系统时钟初始化

void PORT_Init(void); //端口初始化

void UART0_Init(void); //串口UART0初始化

void Send_Char(uchar ch); //发送单个字符

void Send_String(uchar * send_buffer, uint S_len); //发送一个字符串

void Receive_Char(uchar ch); //接收单个字符

void Receive_String(uchar * receive_buffer, uint R_len); //接受一个字符串

void Delay(uint t); //延迟

//----------------------------------------------------------------------

//主函数

//----------------------------------------------------------------------

void main(void)

{

EA = 0; //关全局中断

WDTCN = 0xde; //禁止看门狗

WDTCN = 0xad;

SYSCLK_Init(); //时钟初始化

PORT_Init(); //端口初始化

UART0_Init(); //串口初始化

EA = 1; //开中断

while(1)

{

if(TI0)

Send_String(send_buffer,S_len(send_buffer)); //发送字符串

else

Recieve_String(receive_buffer,R_len(receive_buffer));

Delay(1000); //延迟

}

}

//----------------------------------------------------------------------

//子函数具体实现

//----------------------------------------------------------------------

//系统时钟初始化

void SYSCLK_Init(void)

{

uint i;

OSCXCN = 0x67;

//采用外部晶振22.1184MHz,不分频. 选型OSCXCN=0110,0111

for(i=0;i<256;i++); //等待>1ms

while(!(OSCXCN&0x80)); //查询直到XTLVLD=1,晶振稳定

OSCICN = 0x88;

//切换到外部振荡器,允许时钟失效监测器. OSCICN=1000,1000

}

//端口初始化

void PORT_Init(void)

{

XBR0 = 0x04; //开启UART0

XBR1 = 0x00;

XBR2 = 0x44;

//交叉开关使能,启用UART0,分配到P0.0 P0.1

P0MDOUT |= 0x01;

//P0.0为推拉方式输出,即TX0所在的端口

P1MDOUT |=0x02;

//P0.1为推拉方式输出,即RX0所在的端口

}

//串口0初始化

void UART0_Init(void)

{

SCON0 = 0xBC; //SCON0：模式2，9位UART，使能RX

PCON = 0x10; //使能UART0 的波特率/2 功能

SCON0 |= 0x02; //声明准备就绪,可以发送(TI0=1)

SCON0 = 0x01; //声明准备就绪,可以接受(RI0=1)

}

//发送单个字符

void Send_Char(uchar ch)

{

SBUF0 = ch; //送入缓冲区

while((SCON0&0x02) == 0x00); //等待发送完毕

SCON0 &=0xBC; //软件清零 TI1 = 0

}

//发送字符串,调用Send_Char() len字符串长度

void Send_String(uchar * send_buffer,uint S_len)

{

uint k = 0;

do

{

Send_Char(*(send_buffer + k));

k++;

} while(k < S_len);

}

//接收单个字符

void Recieve_char(uchar sh)

{

SBUF0 = sh;

while((SCON0&0x01)== 0x00);

SCON0 &=0xBC;

}

void Recieve_String(uchar * receive_buffer,uint R_len)

{

uint j = 0;

do

{Recieve_char(*(receive_buffer + j));

j++;

}while(j < R_len)

}

//延迟

void Delay(uint x)

{

uint i;

do{

x--;

for(i=0;i<14;i++){;}

}while(x);

}

//-------------------------------------------------------------

//程序结束