STM32 BS8116a-3触摸按键例程

以下是基于STM32和BS8116a-3的触摸按键的示例代码：

#include "stm32f10x.h"
#include "bs8116a3.h"

#define KEY_SCAN_INTERVAL 50 //扫描按键的时间间隔ms

GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

uint16_t keyValue = 0;  //存储按键状态

void TIM2_IRQHandler(void)
{
  if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
  {
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

    //扫描按键状态
    uint16_t newKeyValue = BS8116a3_Scan();

    //如果按键状态发生变化
    if (newKeyValue != keyValue)
    {
      keyValue = newKeyValue;

      //根据按键状态控制LED灯的亮灭
      if (keyValue & 0x01)  //按键1按下
      {
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
      }
      else  //按键1未按下
      {
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
      }

      TIM_OC1Init(TIM3, &TIM_OCInitStructure);
    }
  }
}

int main(void)
{
  //配置GPIO口
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  //配置TIM3
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  TIM_TimeBaseStructure.TIM_Period = 1000;
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  //配置TIM3的输出比较通道1
  TIM_OCStructInit(&TIM_OCInitStructure);
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
  TIM_OC1Init(TIM3, &TIM_OCInitStructure);

  //配置BS8116a-3
  BS8116a3_Init();

  //配置TIM2用于定时扫描按键状态
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  TIM_TimeBaseStructure.TIM_Period = KEY_SCAN_INTERVAL;
  TIM_TimeBaseStructure.TIM_Prescaler = SystemCoreClock / 1000 - 1;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
  TIM_Cmd(TIM2, ENABLE);

  //启用中断
  NVIC_InitTypeDef NVIC_InitStructure;
  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  while (1)
  {
  }
}

上述代码中，使用了STM32的定时器TIM2作为按键扫描定时器，定时周期为50ms。在TIM2的中断服务函数中，通过调用`BS8116a3_Scan()`函数扫描BS8116a-3的按键状态，并根据按键状态控制LED灯的亮灭。

为了方便起见，这里使用了STM32的定时器TIM3控制LED灯的亮灭。通过调整定时器的输出比较通道1的输出状态来控制LED灯的亮灭。