CW32F030K8U7用库来实现按键长按3秒lcd灯亮的全部代码包括初始化

好的，以下是使用ST标准库实现按键长按3秒LCD灯亮的代码，包括初始化：

#include "stm32f0xx.h"
#include "stm32f0xx_gpio.h"
#include "stm32f0xx_rcc.h"
#include "stm32f0xx_tim.h"
#include "stm32f0xx_exti.h"
#include "stm32f0xx_syscfg.h"

#define LED_PIN GPIO_Pin_0
#define LED_PORT GPIOA
#define KEY_PIN GPIO_Pin_0
#define KEY_PORT GPIOB

void init_gpio(void)
{
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;

    // LED
    GPIO_InitStructure.GPIO_Pin = LED_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(LED_PORT, &GPIO_InitStructure);

    // KEY
    GPIO_InitStructure.GPIO_Pin = KEY_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(KEY_PORT, &GPIO_InitStructure);

    // Connect EXTI Line0 to PB0
    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource0);

    // Configure EXTI Line0
    EXTI_InitTypeDef EXTI_InitStructure;
    EXTI_InitStructure.EXTI_Line = EXTI_Line0;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    // Enable and set EXTI Line0 Interrupt
    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void init_timer(void)
{
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_TimeBaseStructure.TIM_Prescaler = 47999;   // 1ms
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseStructure.TIM_Period = 3000;    // 3 sec
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
    TIM_Cmd(TIM3, DISABLE);

    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority = 0x01;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

int main(void)
{
    init_gpio();
    init_timer();

    while(1)
    {
    }
}

void EXTI0_1_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        TIM_Cmd(TIM3, ENABLE);
        EXTI_ClearITPendingBit(EXTI_Line0);
    }
}

void TIM3_IRQHandler(void)
{
    if(TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
    {
        GPIO_SetBits(LED_PORT, LED_PIN);
        TIM_Cmd(TIM3, DISABLE);
        TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
    }
}

上述代码实现了以下功能：

1. 初始化LED和按键GPIO口。
2. 初始化定时器TIM3，使其定时3秒后触发中断。
3. 在按键中断服务函数中，启动定时器。
4. 在定时器中断服务函数中，点亮LED并停止定时器。

需要注意的是，定时器的计数时钟频率为48MHz，因此需要将预分频器设置为47999，这样计数器每计数一次就相当于1ms。同时，定时器的溢出时间需要设置为3000，这样计数器计数到3000时就会触发中断，即3秒后。