【STM32F411Nucleo测评】移植多功能按键驱动库

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【STM32F411Nucleo测评】移植多功能按键驱动库 [复制链接]

> MultiButton 是一个小巧简单易用的事件驱动型按键驱动模块，可无限量扩展按键，按键事件的回调异步处理方式可以简化你的程序结构，去除冗余的按键处理硬编码，让你的按键业务逻辑更清晰
> 本文将介绍该按键库在STM32F411上面移植的过程

## 硬件连接

原理图中的两个按键管脚对应如下表所示

| 按键 | 管脚|
| ---- | --- |
| KEY0 | B3|
| KEY1 | A10 |

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## 初始化配置

然后在 CubeMX 中初始化这两个管脚和一个定时器，定时器用于检测按键的任务提供时钟，设置为 5ms 一次 tick

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## 移植按键库

初始化按键对象和回调函数，当按键按下时会printf打印信息

```c
void btn1_cb(struct Button* btn) {
  switch (btn->event) {
  case SINGLE_CLICK:
    printf("btn 1 single click\r\n");
    break;

case DOUBLE_CLICK:
    printf("btn 1 double click\r\n");
    break;

default:
    break;
  }
}

void btn2_cb(struct Button* btn) {
  switch (btn->event) {
  case SINGLE_CLICK:
    printf("btn 2 single click\r\n");
    break;

case DOUBLE_CLICK:
    printf("btn 2 double click\r\n");
    break;

case LONG_PRESS_HOLD:
    break;

default:
    break;
  }
}

uint8_t read_btn(uint8_t button_id) {
  uint8_t ret;
  // you can share the GPIO read function with multiple Buttons
  switch (button_id) {
  case 0:
    ret = HAL_GPIO_ReadPin(KEY0_GPIO_Port, KEY0_Pin);
    return ret;
    break;
  case 1:
    ret = HAL_GPIO_ReadPin(KEY1_GPIO_Port, KEY1_Pin);
    return ret;
    break;

default:
    return 0;
    break;
  }
}

struct Button btn1;
struct Button btn2;
void button_setup(void) {
  /* init */
  button_init(&btn1, read_btn, 0, 1);
  button_init(&btn2, read_btn, 0, 0);

/* attach */
  button_attach(&btn1, SINGLE_CLICK, (BtnCallback) btn1_cb);
  button_attach(&btn1, DOUBLE_CLICK, (BtnCallback) btn1_cb);
  button_attach(&btn2, SINGLE_CLICK, (BtnCallback) btn2_cb);
  button_attach(&btn2, DOUBLE_CLICK, (BtnCallback) btn2_cb);
  button_attach(&btn2, LONG_PRESS_HOLD, (BtnCallback) btn2_cb);

/* start */
  button_start(&btn1);
  button_start(&btn2);
}
```

添加printf的支持

```c
int fputc(int ch, FILE *f) {
HAL_UART_Transmit(&huart2,(uint8_t *)&ch,1,0xFFFF);
return ch;
}
```

在中断函数内添加按键任务的时钟

```c
void TIM1_BRK_TIM9_IRQHandler(void)
{
/* USER CODE BEGIN TIM1_BRK_TIM9_IRQn 0 */

/* USER CODE END TIM1_BRK_TIM9_IRQn 0 */
HAL_TIM_IRQHandler(&htim9);
/* USER CODE BEGIN TIM1_BRK_TIM9_IRQn 1 */
button_ticks();
/* USER CODE END TIM1_BRK_TIM9_IRQn 1 */
}
```

multi_button.h 中修改tick为5ms

```c
#define TICKS_INTERVAL  5    //ms
#define DEBOUNCE_TICKS  3    //MAX 7 (0 ~ 7)
#define SHORT_TICKS   (300 /TICKS_INTERVAL)
#define LONG_TICKS  (1000 /TICKS_INTERVAL)
```

## 验证

编译烧录到开发板，当按键按下会打印信息，后面也可以将这个单击、双击添加上别的事件。

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【STM32F411Nucleo测评】移植多功能按键驱动库 [复制链接]

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