22081-12-5 cortex-A7核PWM实验

//头文件
#ifndef __PWM_H__
#define __PWM_H__
 
#include"stm32mp1xx_rcc.h"
#include"stm32mp1xx_gpio.h"
#include"stm32mp1xx_tim.h"
/***********蜂鸣器初始化************/
void sp_pwm(void);
 
/***********风扇初始化*************/
void fan_pwm(void);
 
/***********马达初始化*************/
void motor_pwm(void);
 
#endif

//功能函数
#include"pwm.h"
 
/***********蜂鸣器PB6初始化************/
void sp_pwm()
{
	/*---------RCC章节-----------*/
	//GPIOB使能
	RCC->MP_AHB4ENSETR |= (0x1 << 1);
	//TIM4使能
	RCC->MP_APB1ENSETR |= (0x1 << 2);
 
	/*----------GPIO章节----------*/
	//设置PB6引脚为复用功能
	GPIOB->MODER &= (~(0x3 << 12));
	GPIOB->MODER |= (0x2 << 12);
	//设置PB6复用功能为TIM4_CH1
	GPIOB->AFRL &= (~(0xf << 24));
	GPIOB->AFRL |= (0x2 << 24);
 
	/*----------TIM4章节----------*/
	//设置分频
	TIM4->PSC = 209;
	//设置自动重载计数器值
	TIM4->ARR = 1000;
	//设置捕获计数器的值
	TIM4->CCR1 = 700;
 
	//CR1寄存器初始化控制寄存器
	//边沿对齐
	TIM4->CR1 &= (~(0x3 << 5));
	//设置递减计数器
	TIM4->CR1 |= (0x1 << 4);
	//设置比较捕获寄存器初始化
	//设置pwm模式
	TIM4->CCMR1 &= (~(0x1 << 16));
	TIM4->CCMR1 &= (~(0x7 << 4));
	TIM4->CCMR1 |= (0x6 << 4);
	
 
	//自动重载计数器预加载使能
	TIM4->CR1 |= (0x1 << 7);
	//输出比较寄存器预加载使能
	TIM4->CCMR1 |= (0x1 << 3);
	//配置捕获/比较寄存器输出模式
	TIM4->CCMR1 &= (~0x3);
 
	//比较/捕获寄存器
	TIM4->CCER &= (~(0x1 << 3));
	TIM4->CCER &= (~(0X1 << 1));
	TIM4->CCER |= 0x1;
 
	//设置计数器使能
	TIM4->CR1 |= 0x1;
}
 
/***********风扇PE9初始化*************/
void fan_pwm()
{
 
/*---------RCC章节-----------*/
//GPIO组使能
RCC->MP_AHB4ENSETR |= (0x1 << 4);
//TIM1使能
RCC->MP_APB2ENSETR |= 0x1;
 
/*---------GPIO章节----------*/
//设置PE9引脚为复用功能
GPIOE->MODER &= (~(0x3 << 18));
GPIOE->MODER |= (0x2 << 18);
//设置复用功能为TIM1_CH1
GPIOE->AFRH &= (~(0xf << 4));
GPIOE->AFRH |= (0x1 << 4);
 
/*-------------TIME1_CH1章节----------*/
//设置分频
TIM1->PSC =209;
//设置自动重载计数器的值
TIM1->ARR =1000;
//设置比较/捕获计数器的值
TIM1->CCR1=700;
//BDTR寄存器
TIM1->BDTR |= (0x1 << 15);
 
//设置计数器采用边沿对齐方式
TIM1->CR1 &= (~(0x3 << 5));
//设置计数器为递减计数器
TIM1->CR1 |= (0x1 << 4);
//配置输出比较模式为pwm
TIM1->CCMR1 &= (~(0x1 << 16));
TIM1->CCMR1 &= (~(0x7 << 4));
TIM1->CCMR1 |= (0x6 << 4);
//配置捕获/比较寄存器输出模式
TIM1->CCMR1 &= (~0x3);
//设置比较/捕获寄存器通道1输出极性
TIM1->CCER &= (~(0x1 << 3));
//设置起始状态为高电平
TIM1->CCER &= (~(0x1 << 1));
//设置比较/捕获寄存器为输出信号
TIM1->CCER |= 0x1;
 
//自动重载计数器预加载使能
TIM1->CR1 |= (0x1 << 7);
//配置输出比较寄存器预加载使能
TIM1->CCMR1 |= (0x1 << 3);
//设置计数器使能
TIM1->CR1 |= 0x1;
 
	
}
 
/***********马达PF6初始化*************/
void motor_pwm()
{
/*---------RCC章节-----------*/
//GPIO组使能
RCC->MP_AHB4ENSETR |= (0x1 << 5);
//TIM16使能
RCC->MP_APB2ENSETR |= (0x1 << 3);
 
/*---------GPIO章节----------*/
//设置PF6引脚为复用功能
GPIOF->MODER &= (~(0x3 << 12));
GPIOF->MODER |= (0x2 << 12);
//设置复用功能为TIM16_CH1
GPIOF->AFRL &= (~(0xf << 24));
GPIOF->AFRL |= (0x1 << 24);
 
/*-------------TIME16_CH1章节----------*/
//设置分频
TIM16->PSC =209;
//设置自动重载计数器的值
TIM16->ARR =1000;
//设置比较/捕获计数器的值
TIM16->CCR1=700;
//BDTR寄存器
TIM16->BDTR |= (0x1 << 15);
 
 
//配置输出比较模式为pwm
TIM16->CCMR1 &= (~(0x1 << 16));
TIM16->CCMR1 &= (~(0x7 << 4));
TIM16->CCMR1 |= (0x6 << 4);
//配置捕获/比较寄存器输出模式
TIM16->CCMR1 &= (~0x3);
//设置比较/捕获寄存器通道1输出极性
TIM16->CCER &= (~(0x1 << 3));
//设置起始状态为高电平
TIM16->CCER &= (~(0x1 << 1));
//设置比较/捕获寄存器为输出信号
TIM16->CCER |= 0x1;
 
//配置输出比较寄存器预加载使能
TIM16->CCMR1 |= (0x1 << 3);
//自动重载计数器预加载使能
TIM16->CR1 |= (0x1 << 7);
//计数器使能
TIM16->CR1 |= 0x1;
 
}

//主函数
#include "pwm.h"
 
extern void printf(const char *fmt, ...);
void delay_ms(int ms)
{
	int i,j;
	for(i = 0; i < ms;i++)
		for (j = 0; j < 1800; j++);
}
 
int main()
{
	sp_pwm();
	fan_pwm();
	motor_pwm();
	while(1)
	{
	
	}
	return 0;
}

//实验结果

1、蜂鸣器响

2、风扇转动

3、马达声音响