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一个很简单的用nios写的中断方式接受的串口例子

2007-04-26 17:33 281 查看
#include<stdio.h>
#include<string.h>
#include<fcntl.h>
#include"system.h"
#include"unistd.h"
#include "alt_types.h"

#include <unistd.h>

#include "altera_avalon_uart_regs.h"
#include "altera_avalon_pio_regs.h"
#include "sys/alt_irq.h"
#define quelen 2048
char queue[quelen];
int indexc = 0;
int temp_index=0;
char ch;

static void init_uart_receiver();
static void handle_uart_interrups(void* context, alt_u32 id);

int main(void)
{

init_uart_receiver();
printf("successful");
int f=0;
while (f<1)
{

if (temp_index!=indexc)
{
printf("%c", queue[temp_index]);
temp_index++;
}
}

return 0;
}

static void init_uart_receiver()
{
void* status_ptr;
IOWR_ALTERA_AVALON_UART_CONTROL(UART_BASE, 0x80);
IOWR_ALTERA_AVALON_UART_STATUS(UART_BASE, 0x0);
IOWR_ALTERA_AVALON_UART_RXDATA(UART_BASE, 0x0);
alt_irq_register(UART_IRQ,status_ptr,handle_uart_interrups);
}

static void handle_uart_interrups(void* context, alt_u32 id)
{

volatile char* status_ptr =(volatile char*)context;
*status_ptr =IORD_ALTERA_AVALON_UART_STATUS(UART_BASE);

if((IORD_ALTERA_AVALON_UART_STATUS(UART_BASE)&(0x80)) ==0x80)
{
ch =IORD_ALTERA_AVALON_UART_RXDATA(UART_BASE);

queue[indexc] =ch;
indexc++;

}

IOWR_ALTERA_AVALON_UART_STATUS(UART_BASE, 0x0);
}
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