帮我写一段按键控制STM32单片机代码
时间: 2023-05-23 17:04:36 浏览: 83
Sure, here is an example code for key control of an STM32 microcontroller:
```c
#include "stm32f10x.h"
#define KEY_GPIO GPIOA
#define KEY_PIN GPIO_Pin_0
#define LED_GPIO GPIOC
#define LED_PIN GPIO_Pin_13
void delay(uint32_t time);
int main(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
// Enable clock for GPIOA and GPIOC
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC, ENABLE);
// Configure LED pin
GPIO_InitStructure.GPIO_Pin = LED_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(LED_GPIO, &GPIO_InitStructure);
// Configure key pin
GPIO_InitStructure.GPIO_Pin = KEY_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(KEY_GPIO, &GPIO_InitStructure);
// Enable clock for AFIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
// Connect EXTI line to key pin
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
// Configure EXTI line
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);
// Configure NVIC
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
while (1)
{
// Do nothing
}
}
void EXTI0_IRQHandler(void)
{
// Check if key is pressed
if (GPIO_ReadInputDataBit(KEY_GPIO, KEY_PIN) == Bit_RESET)
{
// Toggle LED
GPIO_WriteBit(LED_GPIO, LED_PIN, (BitAction)(1 - GPIO_ReadOutputDataBit(LED_GPIO, LED_PIN)));
// Delay for debouncing (if needed)
delay(100000);
}
// Clear interrupt flag
EXTI_ClearITPendingBit(EXTI_Line0);
}
void delay(uint32_t time)
{
while (time--);
}
```
This code uses the STM32's EXTI feature to detect rising edges on the key pin (PA0) and toggle the LED (PC13) accordingly. The key pin is configured as an input with pull-up resistor, and the LED pin is configured as an output. A delay function is included for debouncing the key input. The code also sets up the necessary clocks, GPIO configurations, and interrupt handling. Note that you may need to adjust the GPIO and NVIC configurations depending on your specific STM32 board and project requirements.