main.c

刚接触NIOS的时候学习NIOS串口通讯时候些的一个程序

#include <stdio.h>
#include <string.h>
#include <system.h>
#include <sys/alt_irq.h>
//#include "sys/alt_dev.h"
//#include <fcntl.h>
#include "altera_avalon_pio_regs.h"
#include "altera_avalon_uart_regs.h"
#include "altera_avalon_timer_regs.h"


typedef volatile struct
{
    char ms[10];
    char mr[10];
    int ls;
    int lr;
    int ok; 
} uart_mess;




static void uart_manager(void* context, alt_u32 id)
{
  alt_u32 status;
  int ls;
  int lr;
  uart_mess* mess_val = (uart_mess *) context;
   
  status=IORD_ALTERA_AVALON_UART_STATUS(UART_0_BASE);//save mark
  //IOWR_ALTERA_AVALON_UART_STATUS(UART_0_BASE, 0);//clear mark
 
  
  if (status & ALTERA_AVALON_UART_STATUS_TRDY_MSK)//send
  {
   ls=mess_val->ls;
   IOWR_ALTERA_AVALON_UART_TXDATA(UART_0_BASE,mess_val->ms[ls]);
   mess_val->ls=ls-1;
   status=IORD_ALTERA_AVALON_UART_STATUS(UART_0_BASE);
   if (ls<0)
   {} 
   else{
   IOWR_ALTERA_AVALON_UART_STATUS(UART_0_BASE, 0);
   IOWR_ALTERA_AVALON_UART_TXDATA(UART_0_BASE,mess_val->ms[ls]);
   mess_val->ls=ls-1;
   status=IORD_ALTERA_AVALON_UART_STATUS(UART_0_BASE);
   } 
  }
 

  if (status & ALTERA_AVALON_UART_STATUS_RRDY_MSK)//receive
  {
    lr=mess_val->lr;
    if (lr>9)
    {
    }
    else
    {
     mess_val->mr[lr]=(char)IORD_ALTERA_AVALON_UART_RXDATA(UART_0_BASE);
     mess_val->lr=lr+1;
     status=IORD_ALTERA_AVALON_UART_STATUS(UART_0_BASE);
   }   
  }


 
}


static void uart_irq_init(uart_mess* mess)
{
mess->ls=-1;
mess->lr=-1;
mess->ok=0;
IOWR_ALTERA_AVALON_UART_CONTROL(UART_0_BASE, 0xffff);
alt_irq_register( UART_0_IRQ,(void *)mess , uart_manager ); 
}


int main ()
{
//char m[10];

int a;

uart_mess mess;
uart_irq_init(&mess);
printf("waiting");
 a=IORD_ALTERA_AVALON_UART_STATUS(UART_0_BASE);
 IOWR_ALTERA_AVALON_UART_TXDATA(UART_0_BASE,0x60);
while(1)
{
 
if (mess.ls<0)
{
strcpy((char*)mess.ms,"SNED OK!\0");
//printf("send %s",mess.ms);
mess.ls=8;
}

if (mess.lr>9)
{
  printf("\nreceive %s \n",mess.mr);
  strcpy((char*)mess.mr,"\0");
  mess.lr=0;
}
 if (a & ALTERA_AVALON_UART_STATUS_TRDY_MSK)//send
  IOWR_ALTERA_AVALON_UART_TXDATA(UART_0_BASE,0x60);
  else
   a=1;
   
}


return 0;
}