stm32库函数编程基础

stm32编程

1.GPIO初始化

GPIO_InitTypeDef GPIO_InitStrcture;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC,ENABLE);

GPIO_InitStrcture.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_InitStrcture.GPIO_Pin=GPIO_Pin_All;
GPIO_InitStrcture.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStrcture);
GPIO_SetBits(GPIOB,GPIO_Pin_All);

##########################################
只需要定义三个
GPIO_Mode
GPIO_Speed
GPIO_Pin


############################################
对GPIO_Speed:
GPIO_Speed_50MHz
GPIO_Speed_2MHz
GPIO_Speed_10MHz
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

2.GPIO操作

GPIO_SetBits(GPIOB,GPIO_Pin_All);        //置1
GPIO_ResetBits(GPIOB,GPIO_Pin_All);      //置0
GPIO_Write(GPIOB,0xfffe);

##################
1.哪个GPIO端口:GPIOA、GPIOB、GPIOC、GPIOD
2.哪个管脚:GPIO_PIN_15或者赋值
1
2
3
4
5
6
7

3.GPIO输入输出方式

4.对外设使能时钟

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_pppx,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_pppx,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_pppx,ENABLE);


#################################################

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);//这个是必须的，仿真软件必须的	
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
1
2
3
4
5
6
7
8
9
10
11
12

5.定时器初始化

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-XmljJuHh-1651046229866)(file:///C:\Users\16438\Documents\Tencent Files\1014185858\Image\C2C\28_SLG]V3]U9G9WF]5B@$CM.png)]

void TIM3_Int_Init(u16 arr,u16 psc)
{
  	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	NVIC_InitTypeDef NVIC_InitStructure;

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);//这个是必须的，仿真软件必须的	
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); 
	
	TIM_TimeBaseStructure.TIM_Period = arr; 
	TIM_TimeBaseStructure.TIM_Prescaler =psc; 
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;//设置时钟分割1=1,1=2,1=4 
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 
	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); 
 
	TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); 

	NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中断
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //(抢占)先占优先级0级，长的为抢占
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
	NVIC_Init(&NVIC_InitStructure);  //初始化NVIC寄存器

	TIM_Cmd(TIM3, ENABLE);  //使能TIMx
						 
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

6.定时器中断函数

void TIM3_IRQHandler(void)   //TIM3中断
{
	if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)  //检查TIM3更新中断发生与否
		{
			LEDA7=!LEDA7;

			TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  //清除TIMx更新中断标志 
		}
}
1
2
3
4
5
6
7
8
9

7.NVIC初始化

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); 
1

8.外中断初始化

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-rHaTMvhP-1651046229867)(file:///C:\Users\16438\Documents\Tencent Files\1014185858\Image\C2C\8]3$NR2_[N@PED6JH_1L_C.png)]

void EXTIX_Init(void)
{
 
 	EXTI_InitTypeDef EXTI_InitStructure;
 	NVIC_InitTypeDef NVIC_InitStructure;

  	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);	//使能复用功能时钟

    //GPIOE.2 中断线以及中断初始化配置   下降沿触发
  	GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource2);

  	EXTI_InitStructure.EXTI_Line=EXTI_Line2;	//KEY2
  	EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;	
  	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  	EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  	EXTI_Init(&EXTI_InitStructure);	 	//根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器

  	NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;			//使能按键WK_UP所在的外部中断通道
  	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;	//抢占优先级2， 
  	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03;					//子优先级3
  	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;								//使能外部中断通道
  	NVIC_Init(&NVIC_InitStructure); 
 
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

9.外部中断中断函数

void EXTI0_IRQHandler(void)
{
	delay_ms(10);//消抖
	if(WK_UP==1)	 	 //WK_UP按键
	{				 
		BEEP=!BEEP;	
	}
	EXTI_ClearITPendingBit(EXTI_Line0); //清除LINE0上的中断标志位  
}
1
2
3
4
5
6
7
8
9