关于NIOSII中的JTAG_UART的问题
我在SOPC中：cpu,sdram,ram,time,jtag_uart;而且:jtag_uart的名字是jtag_uart;程序：
********************************************************************/
#include<stdio.h>
#include<string.h>
#include "system.h"
#include <stdlib.h>
int main ()
{
char* msg = "Detected the character 't'.\n";
FILE* fp;
char prompt = 0;
printf("Please Enter some characters: \n");
fp = fopen (JTAG_UART_NAME, "w+"); //打开文件进行读和写
if (fp)
{
while (prompt != 'v') // 循环直至接收到 'v
{
prompt = getc(fp); // 从JTAG UART中获取字符
if (prompt == 't')
{// 如果字符为 't' 打印信息
fwrite (msg, strlen (msg), 1, fp);
}
if (ferror(fp))// 检查错误是否与文件指针一起出现
clearerr(fp);// 如果是，清除它
}
fprintf(fp, "Closing the JTAG UART file handle.\n");
fclose (fp);
}
else
{
printf("Fail to open file...\n");
}
return 0;
}
********************************************************************/
build project后：有以下错
undefined reference to main
undefined reference to fopen
undefined reference to getc
undefined reference to fclose
希望大家能为小弟解答下，在下不胜感激！ 我是死当在这里 =>fopen ("/dev/jtag_uart", "r+");
但是main程式变大就不会发生? nios ii 有时候无法显示内容..
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