32单片机外部中断控制蜂鸣器流水灯轮流转换的代码怎么写

好的,我很乐意为您介绍32单片机外部中断控制蜂鸣器流水灯轮流转换的代码编写方法。以下是一个示例代码,展示了如何实现这个功能: ```c #include "stm32f10x.h" #define LED_PORT GPIOA #define LED_PIN GPIO_Pin_All #define BUZZER_PORT GPIOB #define BUZZER_PIN GPIO_Pin_0 volatile uint8_t mode = 0; // 0: 流水灯模式, 1: 蜂鸣器模式 void Delay(uint32_t time) { while(time--); } void EXTI0_IRQHandler(void) { if(EXTI_GetITStatus(EXTI_Line0) != RESET) { mode = !mode; // 切换模式 EXTI_ClearITPendingBit(EXTI_Line0); } } void GPIO_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); GPIO_InitStructure.GPIO_Pin = LED_PIN; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(LED_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = BUZZER_PIN; GPIO_Init(BUZZER_PORT, &GPIO_InitStructure); GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0); } void NVIC_Configuration(void) { NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } void EXTI_Configuration(void) { EXTI_InitTypeDef EXTI_InitStructure; EXTI_InitStructure.EXTI_Line = EXTI_Line0; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); } int main(void) { GPIO_Configuration(); NVIC_Configuration(); EXTI_Configuration(); while(1) { if(mode == 0) { LED_PORT->ODR = 0x01; Delay(0xFFFFF); for(int i = 0; i < 8; i++) { LED_PORT->ODR <<= 1; Delay(0xFFFFF); } } else { BUZZER_PORT->ODR ^= BUZZER_PIN; Delay(0xFFFFF); } } } ``` 这段代码实现了以下功能: 1. 使用外部中断0 (PA0) 作为模式切换按钮。 2. 按下按钮时,在流水灯模式和蜂鸣器模式之间切换。 3. 流水灯模式下,LED灯依次点亮,形成流水效果。 4. 蜂鸣器模式下,蜂鸣器以一定频率闪烁。 5. 使用GPIOA的PA0引脚作为外部中断输入。 6. 使用GPIOB的PB0引脚控制蜂鸣器。