Output comparison code

There is only the code for output comparison, see here for details and methods

#include "stm32f10x.h"
#include "TIM.h"
#include "BUZZER.h"
u16 time2_c2_p=100,time2_c3_p=1000;//频率
u16 CCR2_Val,CCR3_Val;
u8 time2_c2_k=30,time2_c3_k=70;//占空比
void TIM2_PWM_Init()
{
    
    
 TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
 TIM_OCInitTypeDef  TIM_OCInitStructure;
 GPIO_InitTypeDef GPIO_InitStructure;
 NVIC_InitTypeDef NVIC_InitStructure;
 
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
 
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  
  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
 
  TIM_TimeBaseStructure.TIM_Period = 65535;
  TIM_TimeBaseStructure.TIM_Prescaler = 71;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;//电平转换
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 0;//CCRX寄存器
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OC2Init(TIM2, &TIM_OCInitStructure);
  
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 0;
  
   TIM_OC3Init(TIM2, &TIM_OCInitStructure);
   TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Disable);
   TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Disable);
   TIM_Cmd(TIM2, ENABLE);
   
   TIM_ITConfig(TIM2,TIM_IT_CC2 | TIM_IT_CC3, ENABLE);
 }
void TIM2_IRQHandler(void)
{
    
    
 u16 c2_p=time2_c2_p/100,c3_p=time2_c3_p/1000;
 u16 c2_k=c2_p*time2_c2_k/100,c3_k=c3_p*time2_c3_k/100;
 static u8 tim2_2_flag=0,tim2_3_flag=0;
  if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)
  {
    
    
    TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);
  CCR2_Val=TIM_GetCapture2(TIM2);//读取当前CCR的值
  if(tim2_2_flag)   
   TIM_SetCompare2(TIM2, CCR2_Val+c2_p-c2_k);     
  else    
   TIM_SetCompare2(TIM2,CCR2_Val+c2_k);    
  tim2_2_flag^=1;//不断取反
  }
  if (TIM_GetITStatus(TIM2, TIM_IT_CC3) != RESET)
  {
    
    
    TIM_ClearITPendingBit(TIM2, TIM_IT_CC3);
  CCR3_Val=TIM_GetCapture3(TIM2);//读取当前CCR的值
  if(tim2_3_flag)   
   TIM_SetCompare3(TIM2, CCR3_Val+c3_p-c3_k);     
  else    
   TIM_SetCompare3(TIM2,CCR3_Val+c3_k);    
  tim2_3_flag^=1;//不断取反
  }
}