读出PG口0脚值是否为低电平。如果是返回PB端口9脚为低电平

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int main(void)
{
        void IO_Port_config();
       
        while(1)
        {
               
                if        (GPIO_ReadInputDataBit(GPIOG, PGin(0))==0)
                {
                        while(GPIO_ReadInputDataBit(GPIOG,PGin(0))==0);
                        return PBout(9)=0;
                }

               
        }
}
出现以下错误：
..\User\main.c(20): warning:  #223-D: function "BIT_ADDR" declared implicitly
..\User\main.c(20): warning:  #174-D: expression has no effect
..\User\main.c(21): error:  #18: expected a ")"
..\User\main.c(66): warning:  #1-D: last line of file ends without a newline
..\User\main.c(66): warning: At end of source:  #12-D: parsing restarts here after previous syntax error
..\User\main.c(66): error: At end of source:  #29: expected an expression
..\User\main.c(66): error: At end of source:  #65: expected a ";"
  ..\User\main.c(66): error: At end of source:  #67: expected a "}"
..\User\main.c(66): error: At end of source:  #67: expected a "}"      

啊欢欢

直接return就好了 ， 为啥还要加while语句

咸鱼也学习

啊欢欢 发表于 2018-12-20 15:33
直接return就好了 ， 为啥还要加while语句

我要一直判断PG端口0脚是否一直处于电平0状态