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STM32高級(jí)定時(shí)器-PWM簡(jiǎn)單學(xué)習(xí)案例

作者: 時(shí)間:2017-10-11 來(lái)源:網(wǎng)絡(luò) 收藏

  高級(jí)定時(shí)器與通用定時(shí)器比較類(lèi)似,下面是一個(gè)TIM1 的PWM 程序,TIM1是STM32唯一的高級(jí)定時(shí)器。共有4個(gè)通道有死區(qū)有互補(bǔ)。

本文引用地址:http://butianyuan.cn/article/201710/365449.htm

  先是配置IO腳:

  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); //重設(shè)為缺省值

  TIM_TimeBaseStructure.TIM_Prescaler = 4000; //預(yù)分頻(時(shí)鐘分頻)72M/4000=18K

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上計(jì)數(shù)

  TIM_TimeBaseStructure.TIM_Period = 144; //裝載值 18k/144=125hz 就是說(shuō)向上加的144便滿了

  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //設(shè)置了時(shí)鐘分割 不懂得不管

  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0; //周期計(jì)數(shù)器值 不懂得不管

  TIM_TimeBaseInit(TIM1,TIM_TimeBaseStructure); //初始化TIMx的時(shí)間基數(shù)單位

  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; //占空時(shí)間 144 中有40的時(shí)間為高,互補(bǔ)的輸出正好相反

  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //輸出極性

  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; //互補(bǔ)端的極性

  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; //空閑狀態(tài)下的非工作狀態(tài)不管

  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; //先不管

  TIM_OC1Init(TIM1,TIM_OCInitStructure); //數(shù)初始化外設(shè)TIMx通道1這里2.0庫(kù)為T(mén)IM_OCInit

  TIM_Cmd(TIM1,ENABLE);

  TIM_CtrlPWMOutputs(TIM1,ENABLE);

  }

  //設(shè)置捕獲寄存器1

  void SetT1Pwm1(u16 pulse)

  {

  TIM1-》CCR1=pulse;

  }

  //在MAIN 中加點(diǎn)鍵盤(pán)掃描啥的用來(lái)改變占空比

  #include “STM32Lib\f10x.h”

  #include “hal.h”

  extern void SetT1Pwm1(u16 pulse);

  int main(void)

  {

  u16 pulse=40;

  ChipHalInit(); //片內(nèi)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);

  }

  }

  }

  }

  



關(guān)鍵詞: stm32

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