STM32F407VET6按键中断控制RGB灯
时间: 2023-09-18 19:10:42 浏览: 141
STM32F407 外部中断控制LED
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以下是使用STM32F407VET6控制RGB灯的例程。
首先,我们需要初始化GPIO口和中断控制器。
```c
#include "stm32f4xx.h"
void GPIO_Configuration(void);
void EXTI_Configuration(void);
void NVIC_Configuration(void);
int main(void)
{
GPIO_Configuration();
EXTI_Configuration();
NVIC_Configuration();
while(1)
{
// 主循环中不需要做任何事情
}
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
void EXTI_Configuration(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_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);
}
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
```
然后,我们需要编写中断处理函数,当按键按下时,切换RGB灯的颜色。
```c
void EXTI0_IRQHandler(void)
{
if (EXTI_GetITStatus(EXTI_Line0) != RESET)
{
EXTI_ClearITPendingBit(EXTI_Line0);
static uint8_t color = 0;
if (color == 0)
{
GPIO_SetBits(GPIOB, GPIO_Pin_0);
GPIO_ResetBits(GPIOB, GPIO_Pin_1 | GPIO_Pin_2);
}
else if (color == 1)
{
GPIO_SetBits(GPIOB, GPIO_Pin_1);
GPIO_ResetBits(GPIOB, GPIO_Pin_0 | GPIO_Pin_2);
}
else if (color == 2)
{
GPIO_SetBits(GPIOB, GPIO_Pin_2);
GPIO_ResetBits(GPIOB, GPIO_Pin_0 | GPIO_Pin_1);
}
color = (color + 1) % 3;
}
}
```
在这个中断处理函数中,我们使用了一个静态变量`color`来记录当前RGB灯的颜色。当按键按下时,我们将RGB灯的颜色切换为下一个颜色,并更新`color`的值,以便下一次按键按下时切换到正确的颜色。
最后,我们需要在`main`函数中启用全局中断。
```c
int main(void)
{
GPIO_Configuration();
EXTI_Configuration();
NVIC_Configuration();
__enable_irq();
while(1)
{
// 主循环中不需要做任何事情
}
}
```
现在,按下按键时,RGB灯应该会切换颜色。
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