请以STM32G030为硬件,写出一个用状态机方式运行的,能识别5个独立按键的程序,独立按键分别命名为上下左右中
时间: 2024-03-13 16:45:41 浏览: 22
以下是一个使用状态机方式运行的,能够识别5个独立按键的程序示例(以C语言为例,使用STM32CubeIDE编写):
```c
#include "stm32g0xx_hal.h"
#define KEY_UP GPIO_PIN_0
#define KEY_DOWN GPIO_PIN_1
#define KEY_LEFT GPIO_PIN_2
#define KEY_RIGHT GPIO_PIN_3
#define KEY_CENTER GPIO_PIN_4
typedef enum {
IDLE_STATE = 0,
KEY_UP_STATE,
KEY_DOWN_STATE,
KEY_LEFT_STATE,
KEY_RIGHT_STATE,
KEY_CENTER_STATE
} StateTypeDef;
StateTypeDef current_state = IDLE_STATE;
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if (GPIO_Pin == KEY_UP) {
current_state = KEY_UP_STATE;
}
else if (GPIO_Pin == KEY_DOWN) {
current_state = KEY_DOWN_STATE;
}
else if (GPIO_Pin == KEY_LEFT) {
current_state = KEY_LEFT_STATE;
}
else if (GPIO_Pin == KEY_RIGHT) {
current_state = KEY_RIGHT_STATE;
}
else if (GPIO_Pin == KEY_CENTER) {
current_state = KEY_CENTER_STATE;
}
}
int main(void)
{
HAL_Init();
SystemClock_Config();
//初始化GPIO中断
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = KEY_UP | KEY_DOWN | KEY_LEFT | KEY_RIGHT | KEY_CENTER;
GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING_FALLING;
GPIO_InitStruct.Pull = GPIO_PULLUP;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
while (1)
{
switch(current_state) {
case IDLE_STATE:
// do something in idle state
break;
case KEY_UP_STATE:
// do something when KEY_UP is pressed
break;
case KEY_DOWN_STATE:
// do something when KEY_DOWN is pressed
break;
case KEY_LEFT_STATE:
// do something when KEY_LEFT is pressed
break;
case KEY_RIGHT_STATE:
// do something when KEY_RIGHT is pressed
break;
case KEY_CENTER_STATE:
// do something when KEY_CENTER is pressed
break;
default:
current_state = IDLE_STATE;
break;
}
}
}
```
在上述代码中,我们定义了一个枚举类型`StateTypeDef`,用于表示当前的状态。在主循环中,我们使用一个`switch`语句来根据当前状态执行相应的操作。当有按键按下时,`HAL_GPIO_EXTI_Callback()`中断回调函数会被调用,根据按下的按键不同,将当前状态设置为相应的状态。