用time3产生PWM，用time7做定时器

1、time3产生PWM

void MX_TIM3_Init(void) {

  TIM_ClockConfigTypeDef sClockSourceConfig;   TIM_MasterConfigTypeDef sMasterConfig; //  TIM_OC_InitTypeDef sConfigOC;

  htim3.Instance = TIM3;   htim3.Init.Prescaler = 15; // 48M /  47999 1mS / 4799 100uS / 479 10uS /47 1uS  15+1=16  time3的时钟为48M，48/16=3M,

也就是1s产生3M   htim3.Init.CounterMode = TIM_COUNTERMODE_UP; 一个周期波形是先高后低   htim3.Init.Period = TIM3_PERIOD; //宏定义  TIM3_PERIOD 宏定义为100 ， 每一百次产生一次 3M/100  1S中产生这么些次   htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;   //在3M 的情况下进行再次分频   HAL_TIM_Base_Init(&htim3);

  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;   HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig);

  HAL_TIM_PWM_Init(&htim3);

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;   sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;   HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig);

}

#define TIM3_PERIOD 100 #define Bright(x) (((TIM3_PERIOD+1)*x)/100)  x表示占空比例

TIM3_Bright = (uint16_t)Bright(100);

IR_BrightControl(TIM_CHANNEL_4,TIM3_Bright);//这样PWM波就产生了

 

void MX_TIM7_Init(void) {   TIM_MasterConfigTypeDef sMasterConfig;

  htim7.Instance = TIM7;   htim7.Init.Prescaler = 47999; // 48M /  47999 1mS / 4799 100uS / 479 10uS /47 1uS   

48000000/47999 = 1000   1s中产生1000次  也就是1ms一次   htim7.Init.CounterMode = TIM_COUNTERMODE_UP;   htim7.Init.Period = 25;// 17    每25毫秒进入一次中断   htim7.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;   HAL_TIM_Base_Init(&htim7);

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;   sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;   HAL_TIMEx_MasterConfigSynchronization(&htim7, &sMasterConfig);

}

HAL_TIM_Base_Start_IT(&htim7);  //开始中断计时

__HAL_TIM_CLEAR_IT(&htim7, TIM_IT_UPDATE);   HAL_TIM_Base_Stop_IT(&htim7);

 

extern TIM_HandleTypeDef htim7;//计时到了以后进入这个中断 void TIM7_IRQHandler(void) {  HAL_TIM_IRQHandler(&htim7);  /*(1)TIM7 Interrupt Clear*/ // HAL_GPIO_WritePin(GPIOC,GPIO_PIN_9,GPIO_PIN_SET); //IR1  IR1_ON();  HAL_TIM_Base_Stop_IT(&htim7);  OTGIR_Flash = 0;  RunCount++; }