关于宏定义问题

平淡最真

请教：
在32位带操作：

#define GPIO_OUT                *((unsigned int *)((0x40010C0C & 0xF0000000) + 0x02000000 + ((0x40010C0C & 0x00FFFFFF)<<5) + (5<<2))) = 0;
在主函数中调用  GPIO_OUT        就可以

而定义
#define GPIO_OUT                *((unsigned int *)((0x40010C0C & 0xF0000000) + 0x02000000 + ((0x40010C0C & 0x00FFFFFF)<<5) + (5<<2))) ;
在主函数中调用  GPIO_OUT = 0; 就显示
         ..\User\main.c(19): warning:  #174-D: expression has no effect     //表达没有影响
             GPIO_OUT = 0;
         ..\User\main.c(19): error:  #29: expected an expression               //预期的表达
             GPIO_OUT = 0;
这是为什么啊

以下是原程序

# include "stm32f10x.h"
# include "bsp_led.h"

#define GPIO_OUT        *((unsigned int *)((0x40010C0C & 0xF0000000) + 0x02000000 + ((0x40010C0C & 0x00FFFFFF)<<5) + (5<<2))) ;

int main(void)
{
   GPIO_LED();

   GPIO_OUT = 0;
}

qq1242009750

#define GPIO_OUT        *((unsigned int *)((0x40010C0C & 0xF0000000) + 0x02000000 + ((0x40010C0C & 0x00FFFFFF)<<5) + (5<<2))) ;   

GPIO_OUT = 0;  
展开 =
*((unsigned int *)((0x40010C0C & 0xF0000000) + 0x02000000 + ((0x40010C0C & 0x00FFFFFF)<<5) + (5<<2))) ;  = 0；
要把宏定义后面的分号去掉。

#define GPIO_OUT        *((unsigned int *)((0x40010C0C & 0xF0000000) + 0x02000000 + ((0x40010C0C & 0x00FFFFFF)<<5) + (5<<2)))

平淡最真

qq1242009750 发表于 2018-1-12 22:11
#define GPIO_OUT        *((unsigned int *)((0x40010C0C & 0xF0000000) + 0x02000000 + ((0x40010C0C & 0 ...

谢谢  已经弄懂了