电设第二次作业

作业内容

  • 使用定时器输出PWM波控制灯的亮度
  • 设置四个按键
  • 按键1控制模式（占空比或频率）
  • 按键2，3控制升高和降低
  • 按键3实现按下后出现呼吸灯
  • 定时器实现每隔一秒打印一次频率和占空比

全集变量

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int mode=0;int x=0;
int hz=1000;
int zhankongbi=50;

使用定时器输出PWM波

原理图：

代码实现：

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void PWM_Init(){
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
    //配置GPIO
	GPIO_InitTypeDef GPIO;
	GPIO.GPIO_Mode=GPIO_Mode_AF_PP;
	GPIO.GPIO_Pin=GPIO_Pin_0;
	GPIO.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO);
    //配置时基单元
	TIM_InternalClockConfig(TIM2);
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInit_structuct;
	TIM_TimeBaseInit_structuct.TIM_ClockDivision=TIM_CKD_DIV1 ;
	TIM_TimeBaseInit_structuct.TIM_CounterMode=TIM_CounterMode_Up ;
	TIM_TimeBaseInit_structuct.TIM_Period= 100-1;
	TIM_TimeBaseInit_structuct.TIM_Prescaler= 720-1;
	TIM_TimeBaseInit_structuct.TIM_RepetitionCounter= 0;
	TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInit_structuct);
    //配置输入比较单元
	TIM_OCInitTypeDef TIM_OCInit_Structure;
	TIM_OCStructInit(&TIM_OCInit_Structure);
	TIM_OCInit_Structure.TIM_OCMode=TIM_OCMode_PWM1;
	TIM_OCInit_Structure.TIM_OCPolarity=TIM_OCPolarity_High;
	TIM_OCInit_Structure.TIM_OutputState=TIM_OutputState_Enable;
	TIM_OCInit_Structure.TIM_Pulse=0x31;
	TIM_OC1Init(TIM2,&TIM_OCInit_Structure);
	
	TIM_Cmd(TIM2,ENABLE);
}
  • 配置完后，调用函数会在A0输出PWM波（频率1000hz，占空比百分之五十）

按键初始化以及按键设置

代码部分：

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void speedup_Init(){
		RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
	GPIO_InitTypeDef GPIOb1;
	GPIOb1.GPIO_Mode=GPIO_Mode_IPU;
	GPIOb1.GPIO_Pin=GPIO_Pin_15;
	GPIOb1.GPIO_Speed=GPIO_Speed_50MHz;   
	GPIO_Init(GPIOA,&GPIOb1);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource15);
		EXTI_InitTypeDef EXTI_Init_Structure;
		EXTI_Init_Structure.EXTI_Line=EXTI_Line15;
		EXTI_Init_Structure.EXTI_LineCmd=ENABLE;
		EXTI_Init_Structure.EXTI_Mode=EXTI_Mode_Interrupt;
		EXTI_Init_Structure.EXTI_Trigger=EXTI_Trigger_Falling;
		EXTI_Init(&EXTI_Init_Structure);

}
void speeddown_Init(){
		RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
	GPIO_InitTypeDef GPIOb1;
	GPIOb1.GPIO_Mode=GPIO_Mode_IPU;
	GPIOb1.GPIO_Pin=GPIO_Pin_12;
	GPIOb1.GPIO_Speed=GPIO_Speed_50MHz;   
	GPIO_Init(GPIOA,&GPIOb1);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource12);
		EXTI_InitTypeDef EXTI_Init_Structure;
		EXTI_Init_Structure.EXTI_Line=EXTI_Line12;
		EXTI_Init_Structure.EXTI_LineCmd=ENABLE;
		EXTI_Init_Structure.EXTI_Mode=EXTI_Mode_Interrupt;
		EXTI_Init_Structure.EXTI_Trigger=EXTI_Trigger_Falling;
		EXTI_Init(&EXTI_Init_Structure);

}
void change_Init(){
		RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
	GPIO_InitTypeDef GPIOb1;
	GPIOb1.GPIO_Mode=GPIO_Mode_IPU;
	GPIOb1.GPIO_Pin=GPIO_Pin_1;
	GPIOb1.GPIO_Speed=GPIO_Speed_50MHz;   
	GPIO_Init(GPIOB,&GPIOb1);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource1);
		EXTI_InitTypeDef EXTI_Init_Structure;
		EXTI_Init_Structure.EXTI_Line=EXTI_Line1;
		EXTI_Init_Structure.EXTI_LineCmd=ENABLE;
		EXTI_Init_Structure.EXTI_Mode=EXTI_Mode_Interrupt;
		EXTI_Init_Structure.EXTI_Trigger=EXTI_Trigger_Falling;
		EXTI_Init(&EXTI_Init_Structure);
			NVIC_InitTypeDef NVIC_Init_Structure;
		NVIC_Init_Structure.NVIC_IRQChannel=EXTI1_IRQn;
		NVIC_Init_Structure.NVIC_IRQChannelCmd=ENABLE;
		NVIC_Init_Structure.NVIC_IRQChannelPreemptionPriority=0;
		NVIC_Init_Structure.NVIC_IRQChannelSubPriority=0;
		NVIC_Init(&NVIC_Init_Structure);

}
void Exit_init(){
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
	GPIO_InitTypeDef GPIOb1;
	GPIOb1.GPIO_Mode=GPIO_Mode_IPU;
	GPIOb1.GPIO_Pin=GPIO_Pin_11;
	GPIOb1.GPIO_Speed=GPIO_Speed_50MHz;   
	GPIO_Init(GPIOA,&GPIOb1);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource11);
		EXTI_InitTypeDef EXTI_Init_Structure;
		EXTI_Init_Structure.EXTI_Line=EXTI_Line11;
		EXTI_Init_Structure.EXTI_LineCmd=ENABLE;
		EXTI_Init_Structure.EXTI_Mode=EXTI_Mode_Interrupt;
		EXTI_Init_Structure.EXTI_Trigger=EXTI_Trigger_Falling;
		EXTI_Init(&EXTI_Init_Structure);
		NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
		NVIC_InitTypeDef NVIC_Init_Structure;
		NVIC_Init_Structure.NVIC_IRQChannel=EXTI15_10_IRQn;
		NVIC_Init_Structure.NVIC_IRQChannelCmd=ENABLE;
		NVIC_Init_Structure.NVIC_IRQChannelPreemptionPriority=0;
		NVIC_Init_Structure.NVIC_IRQChannelSubPriority=0;
		NVIC_Init(&NVIC_Init_Structure);
	
}
void EXTI15_10_IRQHandler(){
	if(EXTI_GetITStatus(EXTI_Line11)==SET){
	Easy_Delay_ms(15);
while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_11)==0);
Easy_Delay_ms(15);
mode=1-mode;
EXTI_ClearITPendingBit(EXTI_Line11);
}else if(EXTI_GetITStatus(EXTI_Line15)==SET){
Easy_Delay_ms(15);
while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_15)==0);
Easy_Delay_ms(15);
	if(mode==0&&hz<5000){
		hz+=1000;
		TIM_PrescalerConfig(TIM2,7200000/hz-1,TIM_PSCReloadMode_Immediate);
	}
   if(mode==1&&zhankongbi<100){
       zhankongbi+=10;
	   TIM_SetCompare1(TIM2,zhankongbi);
   }
EXTI_ClearITPendingBit(EXTI_Line15);
}else if(EXTI_GetITStatus(EXTI_Line12)==SET){
	Easy_Delay_ms(15);
while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_12)==0);
Easy_Delay_ms(15);
	if(mode==0&&hz>1000){
		hz-=1000;
		TIM_PrescalerConfig(TIM2,7200000/hz-1,TIM_PSCReloadMode_Immediate);
	}
   if(mode==1&&zhankongbi>0){
       zhankongbi-=10;
	   TIM_SetCompare1(TIM2,zhankongbi);}
EXTI_ClearITPendingBit(EXTI_Line12);
}


}
void EXTI1_IRQHandler(){
	if(EXTI_GetITStatus(EXTI_Line1)==SET){
	Easy_Delay_ms(15);
while(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_1)==0);
Easy_Delay_ms(15);
x=1-x;		
	
}
	EXTI_ClearITPendingBit(EXTI_Line1);
}


定时器打印

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void  Timer_init(){
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
	TIM_InternalClockConfig(TIM3);
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInit_structuct;
	TIM_TimeBaseInit_structuct.TIM_ClockDivision=TIM_CKD_DIV1 ;
	TIM_TimeBaseInit_structuct.TIM_CounterMode=TIM_CounterMode_Up ;
	TIM_TimeBaseInit_structuct.TIM_Period= 10000-1;
	TIM_TimeBaseInit_structuct.TIM_Prescaler= 7200-1;
	TIM_TimeBaseInit_structuct.TIM_RepetitionCounter= 0;
	TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInit_structuct);
	TIM_ClearFlag(TIM3,TIM_FLAG_Update);
	TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	NVIC_InitTypeDef NVIC_Init1;
	NVIC_Init1.NVIC_IRQChannel=TIM3_IRQn;
	NVIC_Init1.NVIC_IRQChannelCmd=ENABLE;
	NVIC_Init1.NVIC_IRQChannelPreemptionPriority=0;
	NVIC_Init1.NVIC_IRQChannelSubPriority=0;
	NVIC_Init(&NVIC_Init1);
	TIM_Cmd(TIM3,ENABLE);
void TIM3_IRQHandler(){
	if(mode==0)
		printf("模式:频率 ");
	else
		printf("模式:占空比 ");
	
	printf("频率是%d ",hz);
	printf("占空比是%d%%\r\n",zhankongbi);
 TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
}

主函数部分

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int main(){
int i;
Exit_init();
Timer_init();
speedup_Init();
speeddown_Init();
	change_Init();
PWM_Init();
Serial_Init();
while(1){
	if(x==1){
for(zhankongbi=0;zhankongbi<=100;zhankongbi++)
	{
	TIM_SetCompare1(TIM2,zhankongbi);
		Delay_ms(3);
	}
for(zhankongbi=100;zhankongbi>=0;zhankongbi--)
	{
	TIM_SetCompare1(TIM2,zhankongbi);
		Delay_ms(3);
	}if(x==0){
	zhankongbi=0;
	TIM_SetCompare1(TIM2,zhankongbi);
	}
	}
		
 }
}