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STM32高级定时器-PWM简单学习案例

作者:时间:2017-10-11来源:网络收藏

  高级定时器与通用定时器比较类似,下面是一个TIM1 的PWM 程序,TIM1是STM32唯一的高级定时器。共有4个通道有死区有互补。

本文引用地址:http://www.eepw.com.cn/article/201710/365449.htm

  先是配置IO脚:

  GPIO_InitTypeDef GPIO_InitStructure;

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOA, GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOB, GPIO_InitStructure);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

  TIM_OCInitTypeDef TIM_OCInitStructure;

  void Tim1_Configuration(void)

  {

  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

  TIM_OCInitTypeDef TIM_OCInitStructure;

  TIM_DeInit(TIM1); //重设为缺省值

  TIM_TimeBaseStructure.TIM_Prescaler = 4000; //预分频(时钟分频)72M/4000=18K

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数

  TIM_TimeBaseStructure.TIM_Period = 144; //装载值 18k/144=125hz 就是说向上加的144便满了

  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置了时钟分割 不懂得不管

  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0; //周期计数器值 不懂得不管

  TIM_TimeBaseInit(TIM1,TIM_TimeBaseStructure); //初始化TIMx的时间基数单位

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //PWM模式2

  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //正向通道有效 PA8

  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //反向通道也有效 PB13

  TIM_OCInitStructure.TIM_Pulse = 40; //占空时间 144 中有40的时间为高,互补的输出正好相反

  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性

  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; //互补端的极性

  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; //空闲状态下的非工作状态不管

  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; //先不管

  TIM_OC1Init(TIM1,TIM_OCInitStructure); //数初始化外设TIMx通道1这里2.0库为TIM_OCInit

  TIM_Cmd(TIM1,ENABLE);

  TIM_CtrlPWMOutputs(TIM1,ENABLE);

  }

  //设置捕获寄存器1

  void SetT1Pwm1(u16 pulse)

  {

  TIM1-》CCR1=pulse;

  }

  //在MAIN 中加点键盘扫描啥的用来改变占空比

  #include “STM32Lib\\f10x.h”

  #include “hal.h”

  extern void SetT1Pwm1(u16 pulse);

  int main(void)

  {

  u16 pulse=40;

  ChipHalInit(); //片内硬件初始化

  ChipOutHalInit(); //片外硬件初始化

  for(;;)

  {

  if(GET_UP())

  {

  while(GET_UP());

  if(pulse《=144)

  {

  pulse+=5;

  SetT1Pwm1(pulse);

  }

  }

  if(GET_DOWN())

  {

  while(GET_DOWN());

  if(pulse》30)

  {

  pulse-=5;

  SetT1Pwm1(pulse);

  }

  }

  }

  }

  



关键词: stm32

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