这是我刚刚做的一个小实验（串口中断）。

我用的是6.0版的。

可以在程序中改变波特率

#include "system.h"
#include "alt_types.h"
#include "altera_avalon_uart_regs.h"
#include "sys/alt_irq.h"
#include "stdlib.h"

void uart_int(void);
static void Uart_interrupt(void *context,alt_u32 id);

int main (void) __attribute__ ((weak, alias ("alt_main")));

int alt_main (void)
{
alt_irq_init(ALT_IRQ_BASE);
alt_irq_register(UART_0_IRQ,NULL,Uart_interrupt);
uart_int();
while(1);
return 0;
}

void uart_int(void)
{

alt_u16 control1;
alt_u16 divisor1;

control1 = ALTERA_AVALON_UART_CONTROL_TRDY_MSK |
ALTERA_AVALON_UART_CONTROL_RRDY_MSK |
ALTERA_AVALON_UART_CONTROL_E_MSK;
IOWR_ALTERA_AVALON_UART_CONTROL(UART_0_BASE, control1);


divisor1 = (int)(50000000/(115200+0.5)); //根据需要自己更改
IOWR_ALTERA_AVALON_UART_DIVISOR(UART_0_BASE, divisor1);

}

static void Uart_interrupt(void *context,alt_u32 id)
{
alt_u8 data;
alt_u16 status1;

do{status1 = IORD_ALTERA_AVALON_UART_STATUS(UART_0_BASE);}
while (!(status1 & ALTERA_AVALON_UART_STATUS_RRDY_MSK));
data =IORD_ALTERA_AVALON_UART_RXDATA(UART_0_BASE);//接收数据

status1 = ALTERA_AVALON_UART_STATUS_TRDY_MSK;
IOWR_ALTERA_AVALON_UART_STATUS(UART_0_BASE, status1);
IOWR_ALTERA_AVALON_UART_TXDATA(UART_0_BASE, data); //将接到的信息发出去

IOWR_ALTERA_AVALON_UART_STATUS(UART_0_BASE, 0);
}