uart_rec.c

rs-232-C接口的驱动程序.比较简单适合入门者

#include"stdio.h"

#define uart1data       *(volatile unsigned int *)(0x80000070)
#define uart1status     *(volatile unsigned int *)(0x80000074)
#define uart1ctrl       *(volatile unsigned int *)(0x80000078)
#define uart1scaler     *(volatile unsigned int *)(0x8000007c)


#define uart2data       *(volatile unsigned int *)(0x80000080)
#define uart2status     *(volatile unsigned int *)(0x80000084)
#define uart2ctrl       *(volatile unsigned int *)(0x80000088)
#define uart2scaler     *(volatile unsigned int *)(0x8000008c)

#define uart3data       *(volatile unsigned int *)(0x8000015c)
#define uart3status     *(volatile unsigned int *)(0x80000160)
#define uart3ctrl       *(volatile unsigned int *)(0x80000164)
#define uart3scaler     *(volatile unsigned int *)(0x80000168)

#define secintmask      *(volatile unsigned int *)(0x800000d0)
#define secintclear     *(volatile unsigned int *)(0x800000d8)

#define intmask     	*(volatile unsigned int *)(0x80000090)
#define intclear    	*(volatile unsigned int *)(0x8000009c)
#define gpi1_dir     	*(volatile unsigned int*)(0x800000ac)
#define gpi1_data     	*(volatile unsigned int*)(0x800000a8)

extern void *catch_interrupt(void func(), int irq);
void uart1(void);
void uart2(void);
void uart3(void);

unsigned int i=0,j,k,recbuf[10],m;
unsigned char temp;
unsigned int re_flag=0;

void uart1_int(int irq)
{
	intmask=0x0;
	intclear=0x8;
	temp= uart1data;
	uart1data=temp;
	intmask=0x40c;
}

void uart2_int(int irq)
{	
	intmask=0x0;
	intclear=0x4;
	temp= uart2data;
	uart2data=temp;
	intmask=0x40c;
}

void uart3_int(int irq)
{
	intmask=0x0;
	secintmask = 0x0000000;
	intclear=0x400;
	secintclear = 0x1000000;
	temp= uart3data;
	printf("\n%x",temp);
	for(i=0; i<0x12; i++);
 

	intmask=0x40c;
	secintmask = 0x1400000;

}


main()
{
	unsigned int k;



	gpi1_dir = 0xf;
	gpi1_data = 0x8;
 
	uart1();
	intmask=0x40c;
	secintmask = 0x1400000;
	while(1);


}
void uart1(void)
{
	catch_interrupt(uart1_int, 3);
	uart1ctrl=0x0;

	uart1scaler=0x41;	//38400	20mhz
	uart1ctrl=0x7;
	 
}

void uart2(void)
{
	catch_interrupt(uart2_int, 2);
	uart2ctrl=0x0;

	uart2scaler=0x41;	//38400	20mhz
	uart2ctrl=0x7;
	 
}

void uart3(void)
{
	catch_interrupt(uart3_int, 10);
	uart3ctrl=0x0;

	uart3scaler=0x41;	//38400	20mhz
	uart3ctrl=0x7;
	
	//while(1)
	{
		for(j=0;j<0x5000;j++);
		uart3data = 0x55;
	}
	for(j=0;j<0x5000;j++);
	uart3data = 0xaa;
	
	 
}