__HAL_TIM_SetCompare(&htim1, TIM_CHANNEL_1, pwm)

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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。

void buzzer_on(uint16_t psc, uint16_t pwm) { __HAL_TIM_PRESCALER(&htim4, psc); __HAL_TIM_SetCompare(&htim4, TIM_CHANNEL_3, pwm); }

这段代码定义了一个名为buzzer_on的函数，该函数接受两个参数：psc和pwm。其中，psc用于设置定时器的预分频器，pwm用于设置定时器的比较值，从而控制蜂鸣器的发声频率和音量。

在函数内部，首先使用__HAL_TIM_PRESCALER宏定义来设置定时器htim4的预分频值为psc。然后，使用__HAL_TIM_SetCompare函数来设置定时器htim4的第3个通道（即TIM_CHANNEL_3）的比较值为pwm，从而控制蜂鸣器的发声频率和音量。具体实现上，当定时器计数值达到比较值时，会触发一个中断，从而使蜂鸣器发出声音。