C语言 Cortex-A7核 PWM实验

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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] = 1RCC->MP_AHB4ENSETR |= (0x1 << 1);//2.使能TIM4组控制器 MP_APB1ENSETR[2] = 1RCC->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] = 10GPIOB->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] = 0010GPIOB->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] = 1TIM4->CR1 &= (~(0x3 << 5));   //设置计数器为边沿对齐模式 CR1[6:5] = 00TIM4->CR1 |= (0x1 << 4);      //设置计数器为递减计数器方式 CR1[4] = 1TIM4->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] = 0110TIM4->CCMR1 &= (~(0x1 << 16));TIM4->CCMR1 |= (0x3 << 5);TIM4->CCMR1 |= (0x1 << 3);    //设置输出比较预加载使能 CCMR1[3] = 1TIM4->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] = 1RCC->MP_AHB4ENSETR |= (0x1 << 4);//2.使能TIM1组控制器 MP_AHB2ENSETR[0] = 1RCC->MP_APB2ENSETR |= (0X1 << 0);//GPIO章节初始化//1.设置PE9引脚为复用功能 [19:18] = 10GPIOE->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] = 0001GPIOE->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] = 1TIM1->CR1 &= (~(0x3 << 5));   //设置计数器为边沿对齐模式 CR1[6:5] = 00TIM1->CR1 |= (0x1 << 4);      //设置计数器为递减计数器方式 CR1[4] = 1TIM1->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] = 0110TIM1->CCMR1 &= (~(0x1 << 16));TIM1->CCMR1 |= (0x3 << 5);TIM1->CCMR1 |= (0x1 << 3);    //设置输出比较预加载使能 CCMR1[3] = 1TIM1->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] = 1TIM1->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] = 1RCC->MP_AHB4ENSETR |= (0x1 << 5);//2.使能TIM16组控制器 MP_APB2ENCLRR[3] = 1RCC->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] = 10GPIOF->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] = 0001GPIOF->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] = 1TIM16->CR1 &= (~(0x3 << 5));   //设置计数器为边沿对齐模式 CR1[6:5] = 00TIM16->CR1 |= (0x1 << 4);      //设置计数器为递减计数器方式 CR1[4] = 1TIM16->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] = 0110TIM16->CCMR1 &= (~(0x1 << 16));TIM16->CCMR1 |= (0x3 << 5);TIM16->CCMR1 |= (0x1 << 3);    //设置输出比较预加载使能 CCMR1[3] = 1TIM16->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] = 1TIM16->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;
}

3 实验效果

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