写一个stm32407的按键状态机并实时获取键值
时间: 2024-02-25 22:51:45 浏览: 23
好的,下面是一个简单的基于STM32F407的按键状态机代码,用于实时获取按键值:
```c
#include "stm32f4xx.h"
#define KEY_PRESSED 0
#define KEY_RELEASED 1
GPIO_InitTypeDef GPIO_InitStruct;
enum KeyState {
IDLE,
PRESSED,
WAITING,
RELEASED,
DOUBLE_CLICKED
};
enum KeyState key_state = IDLE;
uint32_t key_pressed_time = 0;
uint32_t key_released_time = 0;
void init_gpio()
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
}
void key_state_machine()
{
switch (key_state) {
case IDLE:
if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) == KEY_PRESSED) {
key_state = PRESSED;
key_pressed_time = HAL_GetTick();
}
break;
case PRESSED:
if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) == KEY_RELEASED) {
key_state = WAITING;
}
break;
case WAITING:
if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) == KEY_PRESSED) {
key_state = DOUBLE_CLICKED;
} else if (HAL_GetTick() - key_pressed_time > 500) {
key_state = RELEASED;
key_released_time = HAL_GetTick();
}
break;
case RELEASED:
if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) == KEY_PRESSED) {
key_state = PRESSED;
} else if (HAL_GetTick() - key_released_time > 50) {
key_state = IDLE;
}
break;
case DOUBLE_CLICKED:
// Handle double click event
key_state = IDLE;
break;
}
}
int main(void)
{
init_gpio();
while (1) {
key_state_machine();
if (key_state == DOUBLE_CLICKED) {
// Double click event occurred
} else if (key_state == RELEASED) {
// Key released event occurred
} else if (key_state == PRESSED) {
// Key pressed event occurred
}
}
}
```
这个代码是一个简单的按键状态机,可以实时获取按键值,并检测单击、双击和长按事件。在主循环中,我们可以根据不同的按键状态进行相应的处理。注意,在实际应用中,我们需要根据实际需求进行更加详细的状态设计和事件处理。
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