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蜂鸣器、风扇、震动马达

news 来源：原创 2024/4/29 7:09:16

本实验采用STM32MP157A

头文件：

#ifndef __PWM_H__
#define __PWM_H__

#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_tim.h"
#include "stm32mp1xx_rcc.h"
//仨头文件里是别人封装好的地址结构体和宏定义

//初始化
void pwm_init();

//风扇
void fen_init();

//马达
void mada_init();
#endif

功能函数

原理上大同小异，本文以风扇为例。（PF9引脚）

一：首先是RCC寄存器使能GPIOE和TIM1

查芯片手册可知，GPIOF为AHB4总线，TIM1为APB2总线

    //RCC  PE9使能(GPIOE)
	RCC->MP_AHB4ENSETR |= (0x1 << 4);
	//TIM1使能 [0] = 1
	RCC->MP_APB2ENSETR |= (0x1 << 0);

二. GPIO初始化

设置引脚复用模式

查手册知，输出模式为AFRH[7：4] = 0x1000

/*********GPIO章节初始化**************/
	//设置引脚复用模式 GPIOE[19:18] = 0x01
	GPIOE->MODER &= (~(0x3 << 18));
	GPIOE->MODER |= (0x2 << 18);
	//设置为AF1:0001 ,AFRH[7:4]
	GPIOE->AFRH &= (~(0xf << 4));
	GPIOE->AFRH |= (0x1 << 4);

三 TIM1设置

根据系统处理图，

1. 先设置分频器系统提供时钟源 209MHz 209

TIM1->PSC &= ~(0xffff);
TIM1->PSC |= 0xd0;  //208

2.设置PWM方波最终周期1000Hz 对自动重载计数器进行赋值 1000

TIM1->ARR &= ~(0xffff);
TIM1->ARR |= (0x3E8);  //1000

3.设置PWM方波占空比对比较/捕获寄存器进行赋值 700

	TIM1->CCR1 &= (~(0xffff));
	TIM1->CCR1 |= (0x2bc);

4.设置TIM1_CH1通道为PWM1模式

设置pwm1模式TIM4_CCMR1的16、[6:4] = 0110

TIM1->CCMR1 &= (~(0x1 << 16));  //16位置0
TIM1->CCMR1 &= (~(0x7 << 4));  //6~4位清零
TIM1->CCMR1 |= (0x6 << 4);     //置为110

5.设置TIM1_CH1通道预加载使能

TIM1->CCMR1 |= (0x1 << 3);

6.设置TIM1_CH1通道为输出模式

TIM1->CCMR1 &= (~(0x3 << 0));

7.设置TIM1_CH1通道输出模式极性高电平

TIM1->CCER &= (~(0x1 << 1));

8.设置TIM1_CH1通道比较捕获寄存器输出使能

TIM1->CCER |= (0x1 << 0);

9~12步

//9.设置TIM1_CH1通道自动重载计数器预加载使能
TIM1->CR1 |= (0x1 << 7);

//10.设置TIM1_CH1通道采用边沿对其方式
TIM1->CR1 &= (~(0x3) << 5);

//11.设置TIM1_CH1通道采用递减计数方式
TIM1->CR1 |= (0x1 << 4);

//12.设置TIM1_CH1通道计数器使能
TIM1->CR1 |= (0x1 << 0);

*13.TIM1_BDTR，注意，此为风扇和马达特有的寄存器，蜂鸣器没有

TIM1->BDTR |= (0x1 << 15);

另外俩元件，TIMx寄存器设置方式相同，只是TIMx寄存器编号不同。而RCC寄存器使能和GPIO寄存器设置，则因为三个元件的引脚所在总线和引脚号的区别，导致都完全不同，要查表写。

以下附上完整代码，注意，因为不同芯片的引脚、总线可能不尽相同，此代码仅供参考，切勿照抄

#include "pwm.h"

void pwm_init()
{
/***********RCC初始化**************/
	//使能GPIOB
	RCC->MP_AHB4ENSETR = (0x1 << 1);
	RCC->MP_APB1ENSETR = (0x1 << 2);	
	/*****GPIO章节初始化*****/
	GPIOB->AFRL &= (~(0xf << 24));
	GPIOB->AFRL |= (0x2 << 24);
	//设置PB6引脚为输出模式
	//GPIOB_MODER[13:12] = 0b01
	GPIOB->MODER &= (~(0x3 << 12));
	GPIOB->MODER |= (0x2 << 12);

/***********TMI4寄存器**************/
	//TIM4_PSC寄存器
	TIM4->PSC &= ~(0xffff);
	TIM4->PSC |= 0xd0;  //208

	//TIM4_ARR寄存器   自动重载寄存器
	TIM4->ARR &= ~(0xffff);
	TIM4->ARR |= (0x3E8);  //1000
	
	//TIM4_CCMR1寄存器
	//设置pwm1模式TIM4_CCMR1 16 [6:4] = 0110
	TIM4->CCMR1 &= (~(0x1 << 16));  //16位置0
	TIM4->CCMR1 &= (~(0x7 << 4));  //6~4位清零
	TIM4->CCMR1 |= (0x6 << 4);     //置为110
	//设置预加载使能TIM4_CCMR1[3] = 1
	TIM4->CCMR1 |= (0x1 << 3);
	//设置为输出模式 TIM4_CCMR1[1:0] = 00
	TIM4->CCMR1 &= (~(0x3 << 0));

	//TIM4_CCER寄存器
	//设置为输出模式
//	TIM4->CCER |= (0x1 << 3);
	
	//设置起始位高电平
	TIM4->CCER &= (~(0x1 << 1));
	
	//配置输出使能
	TIM4->CCER |= (0x1 << 0);

	//TIME4_CCR1
	TIM4->CCR1 &= (~(0xffff));
	TIM4->CCR1 |= (0x12c);

	//TIM4_CR1寄存器
	//自动承载计数器预加载使能
	TIM4->CR1 |= (0x1 << 7);
	//设置边沿对齐模式
	TIM4->CR1 &= (~(0x3) << 5);
	//设置递减计数器
	TIM4->CR1 |= (0x1 << 4);
	//设置计数器使能
	TIM4->CR1 |= (0x1 << 0);
}

void fen_init()
{
	//RCC  PE9使能(GPIOE)
	RCC->MP_AHB4ENSETR |= (0x1 << 4);
	//TIM1使能 [0] = 1
	RCC->MP_APB2ENSETR |= (0x1 << 0);
	
/*********GPIO章节初始化**************/
	//设置引脚复用模式 GPIOE[19:18] = 01
	GPIOE->MODER &= (~(0x3 << 18));
	GPIOE->MODER |= (0x2 << 18);
	//设置为AF1:0001 ,AFRH[7:4]
	GPIOE->AFRH &= (~(0xf << 4));
	GPIOE->AFRH |= (0x1 << 4);

/***********TMI1寄存器***************/
	//1.设置分频器 系统提供时钟源 209MHz 209
	TIM1->PSC &= ~(0xffff);
	TIM1->PSC |= 0xd0;  //208

	//2.设置PWM方波最终周期1000Hz 对自动重载计数器进行赋值 1000
	TIM1->ARR &= ~(0xffff);
	TIM1->ARR |= (0x3E8);  //1000

	//3.设置PWM方波占空比 对比较/捕获寄存器进行赋值 700
	TIM1->CCR1 &= (~(0xffff));
	TIM1->CCR1 |= (0x2bc);

	//4.设置TIM1_CH1通道为PWM1模式
	//设置pwm1模式TIM4_CCMR1 16 [6:4] = 0110
	TIM1->CCMR1 &= (~(0x1 << 16));  //16位置0
	TIM1->CCMR1 &= (~(0x7 << 4));  //6~4位清零
	TIM1->CCMR1 |= (0x6 << 4);     //置为110

	//5.设置TIM1_CH1通道预加载使能
	TIM1->CCMR1 |= (0x1 << 3);

	//6.设置TIM1_CH1通道为输出模式
	TIM1->CCMR1 &= (~(0x3 << 0));

	//7.设置TIM1_CH1通道输出模式极性高电平
	TIM1->CCER &= (~(0x1 << 1));	
	
	//8.设置TIM1_CH1通道比较捕获寄存器输出使能
	TIM1->CCER |= (0x1 << 0);

	//9.设置TIM1_CH1通道自动重载计数器预加载使能
	TIM1->CR1 |= (0x1 << 7);
	//10.设置TIM1_CH1通道采用边沿对其方式
	TIM1->CR1 &= (~(0x3) << 5);

	//11.设置TIM1_CH1通道采用递减计数方式
	TIM1->CR1 |= (0x1 << 4);

	//12.设置TIM1_CH1通道计数器使能
	TIM1->CR1 |= (0x1 << 0);

	//13.TIM1_BDTR 
	TIM1->BDTR |= (0x1 << 15);
}

void mada_init()
{
	//RCC  PF6使能(GPIOE)
	RCC->MP_AHB4ENSETR |= (0x1 << 5);
	//TIM16使能 [0] = 1
	RCC->MP_APB2ENSETR |= (0x1 << 3);
	
/*********GPIO章节初始化**************/
	//设置引脚复用模式 GPIOE[13:12] = 01
	GPIOF->MODER &= (~(0x3 << 12));
	GPIOF->MODER |= (0x2 << 12);
	//设置为AF1:0001 ,AFRH[27:24]
	GPIOF->AFRL &= (~(0xf << 24));
	GPIOF->AFRL |= (0x1 << 24);

/***********TMI1寄存器***************/
	//1.设置分频器 系统提供时钟源 209MHz 209
	TIM16->PSC &= ~(0xffff);
	TIM16->PSC |= 0xd0;  //208

	//2.设置PWM方波最终周期1000Hz 对自动重载计数器进行赋值 1000
	TIM16->ARR &= ~(0xffff);
	TIM16->ARR |= (0x3E8);  //1000

	//3.设置PWM方波占空比 对比较/捕获寄存器进行赋值 300
	TIM16->CCR1 &= (~(0xffff));
	TIM16->CCR1 |= (0x2bc);

	//4.设置TIM1_CH1通道为PWM1模式
	//设置pwm1模式TIM4_CCMR1 16 [6:4] = 0110
	TIM16->CCMR1 &= (~(0x1 << 16));  //16位置0
	TIM16->CCMR1 &= (~(0x7 << 4));  //6~4位清零
	TIM16->CCMR1 |= (0x6 << 4);     //置为110

	//5.设置TIM1_CH1通道预加载使能
	TIM16->CCMR1 |= (0x1 << 3);

	//6.设置TIM1_CH1通道为输出模式
	TIM16->CCMR1 &= (~(0x3 << 0));

	//7.设置TIM1_CH1通道输出模式极性高电平
	TIM16->CCER &= (~(0x1 << 1));	
	
	//8.设置TIM1_CH1通道比较捕获寄存器输出使能
	TIM16->CCER |= (0x1 << 0);

	//9.设置TIM1_CH1通道自动重载计数器预加载使能
	TIM16->CR1 |= (0x1 << 7);
	//10.设置TIM1_CH1通道采用边沿对其方式
	TIM16->CR1 &= (~(0x3) << 5);

	//11.设置TIM1_CH1通道采用递减计数方式
	TIM16->CR1 |= (0x1 << 4);

	//12.设置TIM1_CH1通道计数器使能
	TIM16->CR1 |= (0x1 << 0);

	//13.TIM1_BDTR 
	TIM16->BDTR |= (0x1 << 15);
}