UART初始化函数及其使用.doc

串口函数总结

串口的初始化
voidUART0_Init(intmclk,intbaud)
{
if(mclk==0)mclk=MCLK;
rPCONE=0x28;
rULCON0=0x3;
rUCON0=0x245;
rUBRDIV0=((int)(mclk/16./baud+0.5)-1);

}
voidUART1_Init(intmclk,intbaud)
{
if(mclk==0)mclk=MCLK;
rPCONE=0x28;
rULCON0=0x3;
rUCON0=0x245;
rUBRDIV0=((int)(mclk/16./baud+0.5)-1);

}
查询方式发送数据
voidUART0_SendByte(uint8data)
{
rUTXH0=data;
while((rUTRSTAT0&0x2)==0);
}
查询方式接收
VoidUART0_RcvByte((uint8data)
{
uint8rcv_data;
while((rUTRSTAT0&0x01)==0);
rcv_data=rURXH0;
return(rcv_data);
}
使用外部中断发送和接收字符的函数：

#include"44blib.h"
#include"44b.h"
#include"stdio.h"
voidMain(void);
externvoidEint4567Isr(void)__attribute__((interrupt("IRQ")));
voidinit_Eint(void)；
voidMain(void)
{

sys_init();/*初始化s3c44B0XInterrupt,PortandUART*/
_Link();
init_Eint();
Uart_Printf("\n\rEmbest44B0XEvaluationBoard(S3CEV40)");
Uart_Printf("\n\r8-segmentDigitLEDTestExample(PleaselookatLED)\n");
for(;;)
{
;
}
}

#include"44b.h"
#include"44blib.h"
voidEint4567Isr(void)__attribute__((interrupt("IRQ")));
voidinit_Eint(void)；
externvoidDelay(inttime);
voidinit_Eint(void)
{

rI_ISPC=0x3ffffff;
rEXTINTPND=0xf;//clearEXTINTPNDreg
rINTMOD=0x0;
rINTCON=0x1;
rINTMSK=~(BIT_GLOBAL|BIT_EINT4567);

pISR_EINT4567=(int)Eint4567Isr;

/*PORTG*/
rPCONG=0xffff;//EINT7~0
rPUPG=0x0;//pullupenable
rEXTINT=rEXTINT|0x22220000;//EINT1、EINT4567fallingedgemode
rI_ISPC|=BIT_EINT4567;
rEXTINTPND=0xf;//clearEXTINTPNDreg
}

voidEint4567Isr(void)
{
chari;
unsignedcharwhich_int;
which_int=rEXTINTPND;
rEXTINTPND=0xf; //clearEXTINTPNDreg.
rI_ISPC=BIT_EINT4567; //clearpending_bit

if(which_int==4) //SB2
{
Uart_Printf("发送：\n");
Uart_SendByte('*');
}
elseif(which_int==8) //SB3
{Uart_Printf("接收：\n");
i=Uart_Getch();
Uart_Printf("%c\n",i);
}
}