stm32 按键跑马灯调速

实现按键控制跑马灯的速度，可以使用定时器中断来实现。具体的步骤如下：

1. 初始化定时器，配置定时器时钟源、分频系数、计数器自动重装载值等参数。

2. 初始化按键，配置按键引脚、中断触发方式等参数。

3. 实现定时器中断服务函数，用于控制跑马灯的速度。在中断服务函数中，修改跑马灯的速度参数，例如修改定时器计数器的自动重装载值或者修改跑马灯的闪烁间隔时间。

4. 实现按键中断服务函数，用于控制跑马灯的速度。在按键中断服务函数中，检测按键状态，根据按键状态修改跑马灯的速度参数。

具体的实现细节可以参考下面的示例代码：

#include "stm32f10x.h"

#define LED_GPIO_PORT   GPIOA
#define LED_GPIO_PIN    GPIO_Pin_0

#define KEY_GPIO_PORT   GPIOB
#define KEY_GPIO_PIN    GPIO_Pin_0

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        static uint16_t counter = 0;
        GPIO_WriteBit(LED_GPIO_PORT, LED_GPIO_PIN, (counter++ & 0x01) ? Bit_SET : Bit_RESET);
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
    }
}

void EXTI0_IRQHandler(void)
{
    if (EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        static uint8_t speed = 1;
        if (speed == 1)
        {
            TIM_SetAutoreload(TIM2, 1000);
        }
        else if (speed == 2)
        {
            TIM_SetAutoreload(TIM2, 500);
        }
        else if (speed == 3)
        {
            TIM_SetAutoreload(TIM2, 250);
        }
        if (++speed > 3)
        {
            speed = 1;
        }
        EXTI_ClearITPendingBit(EXTI_Line0);
    }
}

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Pin = LED_GPIO_PIN;
    GPIO_Init(LED_GPIO_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Pin = KEY_GPIO_PIN;
    GPIO_Init(KEY_GPIO_PORT, &GPIO_InitStructure);
}

void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void TIM_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = 1000;
    TIM_TimeBaseStructure.TIM_Prescaler = 7199;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

    TIM_Cmd(TIM2, ENABLE);
}

void EXTI_Configuration(void)
{
    EXTI_InitTypeDef EXTI_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource0);

    EXTI_InitStructure.EXTI_Line = EXTI_Line0;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);
}

int main(void)
{
    GPIO_Configuration();

    NVIC_Configuration();

    TIM_Configuration();

    EXTI_Configuration();

    while (1);
}

在示例代码中，使用定时器 TIM2 来控制跑马灯的闪烁速度，按键使用外部中断 EXTI0 来控制跑马灯的速度调整。在定时器中断服务函数中，每次更新定时器中断标志位时，通过修改计数器的状态来控制跑马灯的闪烁。在按键中断服务函数中，每次检测到按键被按下时，根据当前的速度状态来修改定时器的自动重装载值，从而控制跑马灯的闪烁速度。