蓝桥杯嵌入式第八届决赛-频率控制器

一、题目

二、代码
1.初始化
tx.c

#include "tx.h"

void LED_Init(void){
   
  GPIO_InitTypeDef GPIO_InitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD, ENABLE);
  
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = 0xff00;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  GPIOD->ODR|=(1<<2);
  GPIOC->ODR|=0xff00;
  GPIOD->ODR&=~(1<<2);

}

void KEY_Init(void){
   
  GPIO_InitTypeDef GPIO_InitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
}

u8 key_status[4]={
   1,1,1,1};
void KEY_Driver(void){
   
  u8 i;
  static u8 backup[4]={
   1,1,1,1};
  for(i=0;i<4;i++){
   
  	if(backup[i]!=key_status[i]){
   
	  if(backup[i]!=0){
   
	    Key_action(i+1);
	  }
	  backup[i]=key_status[i];
	}
  }
}

void KEY_Scan(void){
   
  u8 i;
  static u8 key_buf[4]={
   0xff,0xff,0xff,0xff};
  key_buf[0]=(key_buf[0]<<1)|KEY1;
  key_buf[1]=(key_buf[1]<<1)|KEY2;
  key_buf[2]=(key_buf[2]<<1)|KEY3;
  key_buf[3]=(key_buf[3]<<1)|KEY4;

  for(i=0;i<4;i++){
   
    if(key_buf[i]==0x00)
	   key_status[i]=0;
	else if(key_buf[i]==0xff)
	   key_status[i]=1;
  }
}

void Tim4_Init(u16 arr,u16 psc){
   
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;   
  NVIC_InitTypeDef NVIC_InitStructure;		 

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

  NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;	  
  NVIC_Init(&NVIC_InitStructure);

  TIM_TimeBaseStructure.TIM_Period = arr-1;
  TIM_TimeBaseStructure.TIM_Prescaler = psc-1;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
  TIM_ITConfig(TIM4,TIM_IT_Update, ENABLE);

  /* TIM2 enable counter */
  TIM_Cmd(TIM4, ENABLE);

}
//PA6 PA7
u32 CH1_val;
u32 CH1_duty;
u32 CH2_val;
u32 CH2_duty;
void PWM_out(u32 fre1,u16 fre2,u8 en1,u8 en2){
   
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

  CH1_val=1000000/fre1;
  CH1_duty=CH1_val*50/100;
  CH2_val=1000000/fre2;
  CH2_duty=CH2_val*50/100;	  

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz