PIC单片机上串口测试模块

****************************************main.c*********************************

#include #include "uart.h"

#include "iocfg.h"

uchar com_tx_buffer;

void main( )

{

OSCCON=0x7a;//内部晶振16MHz

io_init( );//GPIO口初始化

uart_init(9600);//波特率9600

INTCON=0xe0;//允许终端

while(1)

{

com_tx_buffer=0x55;//发送缓存写入0x55

}

}

***************************************************************************

********************************uart.c*************************************

#include

#include "uart.h"

#define SP1BRG_16M_9K6      418

uchar uart_init(uint baud_rate)

{

uchar br_done=0;

TRISC7=1;//RC6、RC7作为uart口必须设为输入

TRISC6=1;

do

{

if(baud_rate==BAUD_9600)

{

SP1BRGL = SP1BRG_16M_9K6; 

  SP1BRGH = (U16)SP1BRG_16M_9K6 >> 8; 

br_done = 1; 

break;

}

}while(0);

BAUD1CON = 0x08;//16位波特率发生器

RC1STA = 0x90;  //允许发送

TX1STA = 0x24;  //允许接收

RCIE = 1; 

return br_done;

}

void interrupt uart_isr( )

{

if(TXIF)

{

TXIF=0;

TX1REG = com_tx_buffer;

}

}

*************************************************************