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- UID
- 134136
- 性别
- 男
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关于#include <sys/alt_timestamp.h>头文件
#include <stddef.h>
#include <stdio.h>
#include <sys/alt_timestamp.h>
#include <sys/alt_alarm.h>
#include <alt_types.h>
#include <system.h>
int main (void)
{
alt_u32 time1;
alt_u32 time2;
alt_u32 time3;
alt_u32 i;
if (alt_timestamp_start() < 0)
{
printf ("No timestamp device available");
}
else
{
time1 = alt_timestamp();
i=0;
while(i<2000)
i++;
time2 = alt_timestamp();
i=0;
while(i<50000)
i++;
time3 = alt_timestamp();
printf ("time in func1 = %d ticks\n",( int)(time2-time1));
printf ("time in func2 = %d ticks\n",(int)(time3-time2));
printf ("Number of ticks per second = %u\n",(unsigned int) alt_timestamp_freq());
}
return 0;
}
当我编译的时候怎么会出现找没有定义过alt_timestamp_start()。alt_timestamp_freq()等函数
错误显示如下：undefined reference to `alt_timestamp' ../hello_world.c:25: undefined reference to `alt_timestamp'
等的错误。 |
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