小编roe*_*ler的帖子

I try to learn embedded c for a stm32-microcontorller. I try to wirte a easy blink program, where i use the sleep()-function.

code:

/* Includes ------------------------------------------------------------------*/
#include <unistd.h>
#include "main.h"

int main(void)
{
  HAL_Init();

  while (1)
  { 
    HAL_GPIO_TogglePin(LD2_GPIO_Port,LD2_Pin);
    sleep(1);  // this line throws a error, when compiling
  }
}

the compiler gives me following error:

/usr/lib/gcc/arm-none-eabi/7.4.0/../../../../arm-none-eabi/bin/ld: CMakeFiles/untitled2.elf.dir/Src/main.c.obj: in function `main':
/home/heinrich/CLionProjects/untitled2/Src/main.c:106: undefined reference to `sleep'
collect2: error: ld returned 1 exit status
make[3]: *** [CMakeFiles/untitled2.elf.dir/build.make:391: untitled2.elf] Fehler 1
make[2]: *** …