void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, STM32!");
}


TIM_HandleTypeDef htim2;

uint8_t mode = 0;        // 0=呼吸灯 1=无级调光
uint16_t pwm = 0;
uint8_t dir = 0;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM2_Init(void);
void Key(void);
void Breath(void);
void Dim(void);

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_TIM2_Init();

  HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_1);

  while (1)
  {
    Key();
    if(mode == 0) Breath();
    else Dim();
  }
}

// 单按键：单击切换模式，长按调亮度
void Key(void)
{
  if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_1) == 0)
  {
    HAL_Delay(20);
    if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_1) == 0)
    {
      uint32_t t = HAL_GetTick();
      while(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_1) == 0)
      {
        if(HAL_GetTick()-t > 300 && mode==1)
        {
          pwm += 30;
          if(pwm>999) pwm=0;
          __HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, pwm);
          HAL_Delay(60);
        }
      }
      if(HAL_GetTick()-t < 300)
      {
        mode = !mode;
        if(mode==1) pwm=500;
      }
    }
  }
}

// 呼吸灯
void Breath(void)
{
  if(dir==0)
  {
    pwm += 5;
    if(pwm>=999) dir=1;
  }
  else
  {
    pwm -=5;
    if(pwm<=0) dir=0;
  }
  __HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, pwm);
  HAL_Delay(10);
}

// 无级调光保持亮度
void Dim(void)
{
  __HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, pwm);
}

// TIM2 PWM 初始化
static void MX_TIM2_Init(void)
{
  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 71;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 999;
  HAL_TIM_PWM_Init(&htim2);

  TIM_OC_InitTypeDef s = {0};
  s.OCMode = TIM_OCMODE_PWM1;
  s.OCPolarity = TIM_OCPOLARITY_HIGH;
  HAL_TIM_PWM_ConfigChannel(&htim2, &s, TIM_CHANNEL_1);
}

// GPIO初始化
static void MX_GPIO_Init(void)
{
  __HAL_RCC_GPIOA_CLK_ENABLE();

  // PA0 PWM输出
  GPIO_InitTypeDef gpio = {0};
  gpio.Pin = GPIO_PIN_0;
  gpio.Mode = GPIO_MODE_AF_PP;
  gpio.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &gpio);

  // PA1 按键输入
  gpio.Pin = GPIO_PIN_1;
  gpio.Mode = GPIO_MODE_INPUT;
  gpio.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(GPIOA, &gpio);
}

// 时钟
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef o = {0};
  RCC_ClkInitTypeDef c = {0};

  o.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  o.HSEState = RCC_HSE_ON;
  o.PLL.PLLState = RCC_PLL_ON;
  o.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  
  HAL_RCC_OscConfig(&o);

  
  c.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  c.AHBCLKDivider = RCC_SYSCLK_DIV1;
  c.APB1CLKDivider = RCC_HCLK_DIV2;
  c.APB2CLKDivider = RCC_HCLK_DIV1;
  HAL_RCC_ClockConfig(&c, FLASH_LATENCY_1);
}
void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}