STM32F072B-Discovery板子实现触摸调光例程，仅供参考

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nyszx 发布时间：2016-3-31 12:35

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本帖最后由 nyszx 于 2016-3-31 12:51 编辑

有幸得到的STM32F072B-Discovery板子，现在又对 NUCLEO-F446ZE 开发板（重点在F4+eth）垂涎三尺。第一次接触STM32的TSL,官方带驱动，有时间就搞了个触摸调光的程序测试一下。给大家分享一下，玩具级，比较简陋，大神勿喷。仅供测试参考。

所需材料：除开发板外，一个发光二极管就OK
就是这么简陋！
为了实现调光，当然首选PWM输出驱动LED，本人很懒，找了个白色发光二级管,连驱动电路都没焊接，直接把管脚用手掰一掰，卡在PA1和VDD插针上。

程序是从自带Demo程序中改的。只留了TSL部分。

PA1配置为TIM2 PWM HC2输出。很简单。
  /* TIM2 chennel2 configuration : PA.01 */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP ;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Connect TIM pin to AF2 */
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource1, GPIO_AF_2);

接下来就是配置TIM2：

TimerPeriod = (SystemCoreClock / 10000 ) - 1;
Channel2Pulse = (uint16_t) (((uint32_t) 10 * (TimerPeriod - 1)) / 10);

  /* Time Base configuration */
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  /* Channel 2 Configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

  TIM_OC2Init(TIM2, &TIM_OCInitStructure);

  /* TIM2 counter enable */
  TIM_Cmd(TIM2, ENABLE);

  /* TIM2 Main Output Enable */
  TIM_CtrlPWMOutputs(TIM2, ENABLE);

接下来配置触摸检测部分：
亮度分了50级
if (TSL_user_Action() == TSL_STATUS_OK)
{
   if (MyLinRots[0].p_Data->StateId == TSL_STATEID_DETECT && MyLinRots[0].p_Data->Position > 0)
            {
                     T2=MyLinRots[0].p_Data->Position;
                     if (T2< T1)
                     {
                        if( Pulse<51)Pulse++;
                     }
                     if (T2> T1)
                     {
                        if( Pulse>0)Pulse--;
                        }

                     T1=MyLinRots[0].p_Data->Position;
                  }
}
      Channel2Pulse = (uint16_t) (((uint32_t) Pulse * (TimerPeriod - 1)) / 50);
      TIM_SetCompare2(TIM2, Channel2Pulse);

这里其实还可以优化一下，比如没有触摸时就不用设定占空比了。
其他的没用到的都删了。

编译下载跑起来。视频：

忘记传代码了，补上