key_scan(); if(k1==1){while(pwm<500) { pwm++; __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm); HAL_Delay(1); } while (pwm) { pwm--; __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm); HAL_Delay(1); } HAL_Delay(200); } if(k2>0){while (pwm<500) { pwm=pwm+k2; __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm); HAL_Delay(1); } while (pwm) { pwm=pwm-k2; __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm); HAL_Delay(1); } HAL_Delay(200); if(pwm==0) k2=0; } if(k3>0){while (pwm<500) { pwm=pwm-k3; __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm); HAL_Delay(1); } while (pwm) { pwm=pwm+k3; __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm); HAL_Delay(1); } HAL_Delay(200); if(pwm==0) k3=0; } if(k4==1){while (pwm<500) { pwm=1000; __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm); HAL_Delay(1); } while (pwm) { pwm=1000; __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm); HAL_Delay(1); } HAL_Delay(200); }修改代码 让按键之间可以独立作用 能够跳出循环

要让按键之间可以独立作用并能够跳出循环，您可以使用标志变量来控制每个按键的执行情况。在按下某个按键时，将该按键对应的标志变量设置为1，在每次循环迭代时检查标志变量的值，如果为1，则执行相应的操作，并在操作完成后将标志变量重置为0。

以下是修改后的代码示例：

key_scan();

if (k1 == 1) {
    int k1Pressed = 1; // 按键1的标志变量
    while (k1Pressed) {
        while (pwm < 500 && k1 == 1) {
            pwm++;
            __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm);
            HAL_Delay(1);
        }
        while (pwm && k1 == 1) {
            pwm--;
            __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm);
            HAL_Delay(1);
        }
        HAL_Delay(200);

        if (k1 != 1) {
            k1Pressed = 0; // 跳出循环
        }
    }
}

if (k2 > 0) {
    int k2Pressed = 1; // 按键2的标志变量
    while (k2Pressed) {
        while (pwm < 500 && k2 > 0) {
            pwm = pwm + k2;
            __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm);
            HAL_Delay(1);
        }
        while (pwm && k2 > 0) {
            pwm = pwm - k2;
            __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm);
            HAL_Delay(1);
        }
        HAL_Delay(200);

        if (k2 == 0) {
            k2Pressed = 0; // 跳出循环
        }
    }
}

if (k3 > 0) {
    int k3Pressed = 1; // 按键3的标志变量
    while (k3Pressed) {
        while (pwm < 500 && k3 > 0) {
            pwm = pwm - k3;
            __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm);
            HAL_Delay(1);
        }
        while (pwm && k3 > 0) {
            pwm = pwm + k3;
            __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm);
            HAL_Delay(1);
        }
        HAL_Delay(200);

        if (k3 == 0) {
            k3Pressed = 0; // 跳出循环
        }
    }
}

if (k4 == 1) {
    int k4Pressed = 1; // 按键4的标志变量
    while (k4Pressed) {
        while (pwm < 500 && k4 == 1) {
            pwm = 1000;
            __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm);
            HAL_Delay(1);
        }
        while (pwm && k4 == 1) {
            pwm = 1000;
            __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, pwm);
            HAL_Delay(1);
        }
        HAL_Delay(200);

        if (k4 != 1) {
            k4Pressed = 0; // 跳出循环
        }
    }
}

通过使用标志变量，每个按键的操作将独立作用，并且在按键状态发生变化时能够及时跳出循环。请注意，这里假设按键状态是通过外部的key_scan()函数进行更新的。