c - Arduino代码编译错误: "lvalue required as left operand of assignment"

Question

当我尝试编译我的代码时出现此错误:

lvalue required as left operand of assignment.

代码通过模拟端口读入按钮。这就是错误所在(在 void(loop) 中):

while (count < 5){
    buttonPushed(analogPin) = tmp;

        for (j = 0; j < 5; j++) {
                while (tmp == 0) { tmp = buttonPushed(analogPin); }                 //something wrong with the first half of this line!

        if(sequence[j] == tmp){
                        count ++;
                }

        else { 
            lcd.setCursor(0, 1); lcd.print("Wrong! Next round:");                       delay(1000);
                        goto breakLoops;
                }

        }
}

breakLoops:
elapsedTime = millis() - startTime;

在最上面我有:int tmp;

Answer 1

buttonPushed(analogPin) = tmp;

这条线不起作用。 buttonPushed是一个函数，只能从analogPin读取；您不能分配给 C 中函数的结果。我不确定您要做什么，但我认为您可能打算改用另一个变量。