1.要求使用中断完成，板子复位后，三个LED灯是跑马灯的效果，按下某个按键后，在中断函数中实现三个灯常亮的效果。用Keil写stm32的代码

为了实现这个功能，你需要在STM32中设置跑马灯效果作为中断服务，并添加按键中断用于切换到常亮模式。这里是一个基本的示例，使用Keil MDK编写STM32CubeMX生成的工程。假设我们有GPIOA、GPIOB和GPIOC分别控制三个LED，按键连接到PA0:

#include "stm32f10x.h"
#include "delay.h"

// LED GPIOs
GPIO_TypeDef* led_pins[] = {GPIOA, GPIOB, GPIOC};
uint8_t led_mask[] = {0b00001111, // mask for all bits on a pin
                      0b11110000, // same for the other pins
                      0b00001111};

// Key press GPIO and interrupt
GPIO_TypeDef* key_pin = GPIOA;
uint16_t key_mask = 0b00000001;

// Global variables
bool is_led_on = false; // flag to switch between flashing and on

void LedInit(void) {
    GPIO_InitTypeDef GPIO_InitStructure;

    for (int i = 0; i < 3; i++) {
        GPIO_InitStructure.GPIO_Pin = led_pins[i]->IDR & led_mask[i]; // Set initial LEDs off
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; // Push-Pull Output
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        HAL_GPIO_Init(led_pins[i], &GPIO_InitStructure);
    }
}

void KeyInit(void) {
    GPIO_InitStructure.GPIO_Pin = key_pin->IDR & key_mask;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_In_FLOATING; // Input with no pull-up or pull-down
    HAL_GPIO_Init(key_pin, &GPIO_InitStructure);
    EXTI_InitStructure.EXTI_Line = key_pin->IDR & key_mask;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; // Interrupt on rising edge
    EXTI_InitStructure.EXTI_LINE_ID = EXTI_Line_GPIOx; // Replace x with your key Pin number
    HAL_NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; // EXTI9_5_IRQn corresponds to GPIO interrupts
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    HAL_NVIC_Config(&NVIC_InitStructure);
}

void EXTI9_5_IRQHandler(void) {
    if (HAL_GPIO_ReadPin(key_pin, key_mask)) { // Check if key is pressed
        is_led_on = !is_led_on;
        ToggleLeds(is_led_on); // Switch LED state
    } else {
        HAL_GPIO_EXTI_IRQHandler(KEY_PIN); // Clear interrupt if key was released
    }
}

void ToggleLeds(bool state) {
    for (int i = 0; i < 3; i++) {
        uint16_t pin_mask = led_pins[i]->IDR & led_mask[i];
        if (state)
            HAL_GPIO_WritePin(led_pins[i], pin_mask, GPIO_PIN_SET);
        else
            HAL_GPIO_WritePin(led_pins[i], pin_mask, GPIO_PIN_RESET);
    }
    if (!state)
        __disable_irq(); // Disable interrupts while keeping LED state to avoid flickering
    Delay_ms(100); // Short delay before re-enabling interrupts
    __enable_irq();
}

int main(void) {
    LedInit();
    KeyInit();

    while (1) {
        // Your main loop here - not needed for this example
    }
}