505972ca498e001b1f47f7c69a081316

基于Nios II的串口通信

/*
 * "Hello World" example.
 *
 * This example prints 'Hello from Nios II' to the STDOUT stream. It runs on
 * the Nios II 'standard', 'full_featured', 'fast', and 'low_cost' example
 * designs. It runs with or without the MicroC/OS-II RTOS and requires a STDOUT
 * device in your system's hardware.
 * The memory footprint of this hosted application is ~69 kbytes by default
 * using the standard reference design.
 *
 * For a reduced footprint version of this template, and an explanation of how
 * to reduce the memory footprint for a given application, see the
 * "small_hello_world" template.
 *
 */

#include <stdio.h>
#include <excalibur.h>

int main(void)
{
  unsigned char c;
  int ctrl;
  int d;
  int i,j;
  i=0;j=0;
  
  ctrl=IORD_ALTERA_AVALON_PIO_DATA(CTRL_PIO_BASE); //读取外接控制信号
  if(ctrl = 0)
  {
    i++;
    if(i>1000)
    return;
  }
  if (ctrl=1)
  {
    j++;
    while ((c=nr_uart_rxchar(na_uart)) == -1);  
      //从串口1接收字符
    if(c=0x55)
       nr_uart_txchar(0x33,0);
     //将0x33传给默认串口
      else
       c=c-Oxaa;
       d=int(c/2);
       nr_uart_txchar(d,0);
  //将计算后的数据传给默认串口
  }
 
}