C语言 Cortex-A7核 PWM实验

news2024/12/23 12:10:02

1 实验目的

驱动开发板蜂鸣器风扇、马达进行工作

2 代码

pwm.h

#ifndef __PWM_H__                   
#define __PWM_H__                   
                                    
#include "stm32mp1xx_rcc.h"         
#include "stm32mp1xx_gpio.h"        
#include "stm32mp1xx_tim.h"         
                                    
//蜂鸣器：PB6 ---> TIM4_CH1         
void hal_beep_init();               
//风扇：PE9 ---> TIM1_CH1           
void hal_fan_init();                
//马达：PF6 ---> TIM16_CH1          
void hal_monitor_init();            
                                    
#endif

pwm.c

#include "pwm.h"

//蜂鸣器：PB6 ---> TIM4_CH1
void hal_beep_init()
{
    //RCC章节初始化
    //1.使能GPIOB组控制器 MP_AHB4ENSETR[1] = 1
    RCC->MP_AHB4ENSETR |= (0x1 << 1);
    //2.使能TIM4组控制器 MP_APB1ENSETR[2] = 1
    RCC->MP_APB1ENSETR |= (0X1 << 2);

    //GPIO章节初始化
    //1.设置PB6引脚为复用功能 GPIOB->MODER[13:12] = 10
    GPIOB->MODER &= (~(0x3 << 12));
    GPIOB->MODER |= (0x1 << 13);
    //2.设置PB6引脚复用功能为TIM4_CH1功能  GPIOB->AFRL[27:24] = 0010
    GPIOB->AFRL &= (~(0xf << 24));
    GPIOB->AFRL |= (0x1 << 25);

    //TIM1章节
    //PWM方波频率为 : 1000HZ
    //思路: 1.准备值(分频器，自动重载计数器，比较捕获寄存器)    
    //2.使能/输出
    TIM4->ARR = 1000;             //设置自动重载计数器中的值
    TIM4->PSC = 209-1;              //设置系统提供的时钟源进行分频
    TIM4->CCR1 = 300;             //设置捕获/比较寄存器中的值

    //CR1寄存器初始化
    TIM4->CR1 |= (0x1 << 7);      //设置自动重载计数器预加载使能 CR1[7] = 1
    TIM4->CR1 &= (~(0x3 << 5));   //设置计数器为边沿对齐模式 CR1[6:5] = 00
    TIM4->CR1 |= (0x1 << 4);      //设置计数器为递减计数器方式 CR1[4] = 1
    TIM4->CR1 |= (0x1 << 0);      //设置计数器使能 CR1[0] = 1
    //CCMR1寄存器初始化
    TIM4->CCMR1 &= (~(0x1 << 4)); //设置PWM模式选择 CCMR1[16][6:4] = 0110
    TIM4->CCMR1 &= (~(0x1 << 16));
    TIM4->CCMR1 |= (0x3 << 5);
    TIM4->CCMR1 |= (0x1 << 3);    //设置输出比较预加载使能 CCMR1[3] = 1
    TIM4->CCMR1 &= (~(0x3 << 0)); //设置捕获/比较选择输出
    //CCER、CCR1寄存器初始化
    TIM4->CCER &= (~(0x5 << 1));  //设置捕获比较寄存器默认输出极性为高电平 CCER[3][1] = 00(高电平)/01(低电平)
    TIM4->CCER |= (0x1 << 0);     //设置捕获/比较输出使能 CCER[0] = 1

}
//风扇：PE9 ---> TIM1_CH1
void hal_fan_init()
{
    //RCC章节初始化
    //1.使能GPIOE组控制器 MP_AHB4ENSETR[4] = 1
    RCC->MP_AHB4ENSETR |= (0x1 << 4);
    //2.使能TIM1组控制器 MP_AHB2ENSETR[0] = 1
    RCC->MP_APB2ENSETR |= (0X1 << 0);

    //GPIO章节初始化
    //1.设置PE9引脚为复用功能 [19:18] = 10
    GPIOE->MODER &= (~(0x3 << 18));
    GPIOE->MODER |= (0x1 << 19);
    //2.设置PE9引脚复用功能为TIM1_CH1功能  AF1 0001 GPIOE->AFRH[7:4] = 0001
    GPIOE->AFRH &= (~(0xf << 4));
    GPIOE->AFRH |= (0x1 << 4);

    //TIM1章节
    //PWM方波频率为 : 1000HZ
    //思路: 1.准备值(分频器，自动重载计数器，比较捕获寄存器)    
    TIM1->ARR = 1000;             //设置自动重载计数器中的值
    TIM1->PSC = 800;              //设置系统提供的时钟源进行分频
    TIM1->CCR1 = 300;             //设置捕获/比较寄存器中的值

    //CR1寄存器初始化
    TIM1->CR1 |= (0x1 << 7);      //设置自动重载计数器预加载使能 CR1[7] = 1
    TIM1->CR1 &= (~(0x3 << 5));   //设置计数器为边沿对齐模式 CR1[6:5] = 00
    TIM1->CR1 |= (0x1 << 4);      //设置计数器为递减计数器方式 CR1[4] = 1
    TIM1->CR1 |= (0x1 << 0);      //设置计数器使能 CR1[0] = 1
    //CCMR1寄存器初始化
    TIM1->CCMR1 &= (~(0x1 << 4)); //设置PWM模式选择 CCMR1[16][6:4] = 0110
    TIM1->CCMR1 &= (~(0x1 << 16));
    TIM1->CCMR1 |= (0x3 << 5);
    TIM1->CCMR1 |= (0x1 << 3);    //设置输出比较预加载使能 CCMR1[3] = 1
    TIM1->CCMR1 &= (~(0x3 << 0)); //设置捕获/比较选择输出
    //CCER、CCR1寄存器初始化
    TIM1->CCER &= (~(0x5 << 1));  //设置捕获比较寄存器默认输出极性为高电平 CCER[3][1] = 00(高电平)/01(低电平)
    TIM1->CCER |= (0x1 << 0);     //设置捕获/比较输出使能 CCER[0] = 1
    TIM1->BDTR |= (0x1 << 15);    //BDTR使能
}

//马达：PF6 ---> TIM16_CH1
void hal_monitor_init()
{
    //RCC章节初始化
    //1.使能GPIOF组控制器 MP_AHB2ENSETR[5] = 1
    RCC->MP_AHB4ENSETR |= (0x1 << 5);
    //2.使能TIM16组控制器 MP_APB2ENCLRR[3] = 1
    RCC->MP_APB2ENSETR |= (0X1 << 3);
    //GPIO章节初始化
    //1.设置PF6引脚为复用功能 GPIOF->MODER[13:12] = 10
    GPIOF->MODER &= (~(0x3 << 12));
    GPIOF->MODER |= (0x1 << 13);
    //2.设置PF6引脚复用功能为TIM16_CH1功能  AF1 0001 GPIOF->AFRL [27:24] = 0001
    GPIOF->AFRL &= (~(0xf << 24));
    GPIOF->AFRL |= (0x1 << 24);

    //TIM16章节
    //PWM方波频率为 : 1000HZ
    //思路: 1.准备值(分频器，自动重载计数器，比较捕获寄存器)    
    TIM16->ARR = 1000;             //设置自动重载计数器中的值
    TIM16->PSC = 209-1;              //设置系统提供的时钟源进行分频
    TIM16->CCR1 = 300;             //设置捕获/比较寄存器中的值

    //CR1寄存器初始化
    TIM16->CR1 |= (0x1 << 7);      //设置自动重载计数器预加载使能 CR1[7] = 1
    TIM16->CR1 &= (~(0x3 << 5));   //设置计数器为边沿对齐模式 CR1[6:5] = 00
    TIM16->CR1 |= (0x1 << 4);      //设置计数器为递减计数器方式 CR1[4] = 1
    TIM16->CR1 |= (0x1 << 0);      //设置计数器使能 CR1[0] = 1
    //CCMR1寄存器初始化
    TIM16->CCMR1 &= (~(0x1 << 4)); //设置PWM模式选择 CCMR1[16][6:4] = 0110
    TIM16->CCMR1 &= (~(0x1 << 16));
    TIM16->CCMR1 |= (0x3 << 5);
    TIM16->CCMR1 |= (0x1 << 3);    //设置输出比较预加载使能 CCMR1[3] = 1
    TIM16->CCMR1 &= (~(0x3 << 0)); //设置捕获/比较选择输出
    //CCER、CCR1寄存器初始化
    TIM16->CCER &= (~(0x5 << 1));  //设置捕获比较寄存器默认输出极性为高电平 CCER[3][1] = 00(高电平)/01(低电平)
    TIM16->CCER |= (0x1 << 0);     //设置捕获/比较输出使能 CCER[0] = 1

    TIM16->BDTR |= (0x1 << 15);     //BDTR使能
}

main.c

#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()
{
    hal_beep_init(); //蜂鸣器初始化
    hal_fan_init();//风扇初始化
    hal_monitor_init();//马达初始化
    while(1)
    {

    }
    return 0;
}