• C语言 Cortex-A7核 PWM实验

    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

    1. #ifndef __PWM_H__                   
    2. #define __PWM_H__                   
    3.                                     
    4. #include "stm32mp1xx_rcc.h"         
    5. #include "stm32mp1xx_gpio.h"        
    6. #include "stm32mp1xx_tim.h"         
    7.                                     
    8. //蜂鸣器：PB6 ---> TIM4_CH1         
    9. void hal_beep_init();               
    10. //风扇：PE9 ---> TIM1_CH1           
    11. void hal_fan_init();                
    12. //马达：PF6 ---> TIM16_CH1          
    13. void hal_monitor_init();            
    14.                                     
    15. #endif

    pwm.c

    1. #include "pwm.h"
    2.  
    3. //蜂鸣器：PB6 ---> TIM4_CH1
    4. void hal_beep_init()
    5. {
    6.     //RCC章节初始化
    7.     //1.使能GPIOB组控制器 MP_AHB4ENSETR[1] = 1
    8.     RCC->MP_AHB4ENSETR |= (0x1 << 1);
    9.     //2.使能TIM4组控制器 MP_APB1ENSETR[2] = 1
    10.     RCC->MP_APB1ENSETR |= (0X1 << 2);
    11.  
    12.     //GPIO章节初始化
    13.     //1.设置PB6引脚为复用功能 GPIOB->MODER[13:12] = 10
    14.     GPIOB->MODER &= (~(0x3 << 12));
    15.     GPIOB->MODER |= (0x1 << 13);
    16.     //2.设置PB6引脚复用功能为TIM4_CH1功能  GPIOB->AFRL[27:24] = 0010
    17.     GPIOB->AFRL &= (~(0xf << 24));
    18.     GPIOB->AFRL |= (0x1 << 25);
    19.  
    20.     //TIM1章节
    21.     //PWM方波频率为 : 1000HZ
    22.     //思路: 1.准备值(分频器，自动重载计数器，比较捕获寄存器)    
    23.     //2.使能/输出
    24.     TIM4->ARR = 1000;             //设置自动重载计数器中的值
    25.     TIM4->PSC = 209-1;              //设置系统提供的时钟源进行分频
    26.     TIM4->CCR1 = 300;             //设置捕获/比较寄存器中的值
    27.  
    28.     //CR1寄存器初始化
    29.     TIM4->CR1 |= (0x1 << 7);      //设置自动重载计数器预加载使能 CR1[7] = 1
    30.     TIM4->CR1 &= (~(0x3 << 5));   //设置计数器为边沿对齐模式 CR1[6:5] = 00
    31.     TIM4->CR1 |= (0x1 << 4);      //设置计数器为递减计数器方式 CR1[4] = 1
    32.     TIM4->CR1 |= (0x1 << 0);      //设置计数器使能 CR1[0] = 1
    33.     //CCMR1寄存器初始化
    34.     TIM4->CCMR1 &= (~(0x1 << 4)); //设置PWM模式选择 CCMR1[16][6:4] = 0110
    35.     TIM4->CCMR1 &= (~(0x1 << 16));
    36.     TIM4->CCMR1 |= (0x3 << 5);
    37.     TIM4->CCMR1 |= (0x1 << 3);    //设置输出比较预加载使能 CCMR1[3] = 1
    38.     TIM4->CCMR1 &= (~(0x3 << 0)); //设置捕获/比较选择输出
    39.     //CCER、CCR1寄存器初始化
    40.     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)
    41.     TIM4->CCER |= (0x1 << 0);     //设置捕获/比较输出使能 CCER[0] = 1
    42.  
    43. }
    44. //风扇：PE9 ---> TIM1_CH1
    45. void hal_fan_init()
    46. {
    47.     //RCC章节初始化
    48.     //1.使能GPIOE组控制器 MP_AHB4ENSETR[4] = 1
    49.     RCC->MP_AHB4ENSETR |= (0x1 << 4);
    50.     //2.使能TIM1组控制器 MP_AHB2ENSETR[0] = 1
    51.     RCC->MP_APB2ENSETR |= (0X1 << 0);
    52.  
    53.     //GPIO章节初始化
    54.     //1.设置PE9引脚为复用功能 [19:18] = 10
    55.     GPIOE->MODER &= (~(0x3 << 18));
    56.     GPIOE->MODER |= (0x1 << 19);
    57.     //2.设置PE9引脚复用功能为TIM1_CH1功能  AF1 0001 GPIOE->AFRH[7:4] = 0001
    58.     GPIOE->AFRH &= (~(0xf << 4));
    59.     GPIOE->AFRH |= (0x1 << 4);
    60.  
    61.     //TIM1章节
    62.     //PWM方波频率为 : 1000HZ
    63.     //思路: 1.准备值(分频器，自动重载计数器，比较捕获寄存器)    
    64.     TIM1->ARR = 1000;             //设置自动重载计数器中的值
    65.     TIM1->PSC = 800;              //设置系统提供的时钟源进行分频
    66.     TIM1->CCR1 = 300;             //设置捕获/比较寄存器中的值
    67.  
    68.     //CR1寄存器初始化
    69.     TIM1->CR1 |= (0x1 << 7);      //设置自动重载计数器预加载使能 CR1[7] = 1
    70.     TIM1->CR1 &= (~(0x3 << 5));   //设置计数器为边沿对齐模式 CR1[6:5] = 00
    71.     TIM1->CR1 |= (0x1 << 4);      //设置计数器为递减计数器方式 CR1[4] = 1
    72.     TIM1->CR1 |= (0x1 << 0);      //设置计数器使能 CR1[0] = 1
    73.     //CCMR1寄存器初始化
    74.     TIM1->CCMR1 &= (~(0x1 << 4)); //设置PWM模式选择 CCMR1[16][6:4] = 0110
    75.     TIM1->CCMR1 &= (~(0x1 << 16));
    76.     TIM1->CCMR1 |= (0x3 << 5);
    77.     TIM1->CCMR1 |= (0x1 << 3);    //设置输出比较预加载使能 CCMR1[3] = 1
    78.     TIM1->CCMR1 &= (~(0x3 << 0)); //设置捕获/比较选择输出
    79.     //CCER、CCR1寄存器初始化
    80.     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)
    81.     TIM1->CCER |= (0x1 << 0);     //设置捕获/比较输出使能 CCER[0] = 1
    82.     TIM1->BDTR |= (0x1 << 15);    //BDTR使能
    83. }
    84.  
    85. //马达：PF6 ---> TIM16_CH1
    86. void hal_monitor_init()
    87. {
    88.     //RCC章节初始化
    89.     //1.使能GPIOF组控制器 MP_AHB2ENSETR[5] = 1
    90.     RCC->MP_AHB4ENSETR |= (0x1 << 5);
    91.     //2.使能TIM16组控制器 MP_APB2ENCLRR[3] = 1
    92.     RCC->MP_APB2ENSETR |= (0X1 << 3);
    93.     //GPIO章节初始化
    94.     //1.设置PF6引脚为复用功能 GPIOF->MODER[13:12] = 10
    95.     GPIOF->MODER &= (~(0x3 << 12));
    96.     GPIOF->MODER |= (0x1 << 13);
    97.     //2.设置PF6引脚复用功能为TIM16_CH1功能  AF1 0001 GPIOF->AFRL [27:24] = 0001
    98.     GPIOF->AFRL &= (~(0xf << 24));
    99.     GPIOF->AFRL |= (0x1 << 24);
    100.  
    101.     //TIM16章节
    102.     //PWM方波频率为 : 1000HZ
    103.     //思路: 1.准备值(分频器，自动重载计数器，比较捕获寄存器)    
    104.     TIM16->ARR = 1000;             //设置自动重载计数器中的值
    105.     TIM16->PSC = 209-1;              //设置系统提供的时钟源进行分频
    106.     TIM16->CCR1 = 300;             //设置捕获/比较寄存器中的值
    107.  
    108.     //CR1寄存器初始化
    109.     TIM16->CR1 |= (0x1 << 7);      //设置自动重载计数器预加载使能 CR1[7] = 1
    110.     TIM16->CR1 &= (~(0x3 << 5));   //设置计数器为边沿对齐模式 CR1[6:5] = 00
    111.     TIM16->CR1 |= (0x1 << 4);      //设置计数器为递减计数器方式 CR1[4] = 1
    112.     TIM16->CR1 |= (0x1 << 0);      //设置计数器使能 CR1[0] = 1
    113.     //CCMR1寄存器初始化
    114.     TIM16->CCMR1 &= (~(0x1 << 4)); //设置PWM模式选择 CCMR1[16][6:4] = 0110
    115.     TIM16->CCMR1 &= (~(0x1 << 16));
    116.     TIM16->CCMR1 |= (0x3 << 5);
    117.     TIM16->CCMR1 |= (0x1 << 3);    //设置输出比较预加载使能 CCMR1[3] = 1
    118.     TIM16->CCMR1 &= (~(0x3 << 0)); //设置捕获/比较选择输出
    119.     //CCER、CCR1寄存器初始化
    120.     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)
    121.     TIM16->CCER |= (0x1 << 0);     //设置捕获/比较输出使能 CCER[0] = 1
    122.  
    123.     TIM16->BDTR |= (0x1 << 15);     //BDTR使能
    124. }
    125.  
    126.                                                                                                                                                                           
    127.                                                                                                                                                                           
    128.                                                                                                                                                                           
    129.                                                                                                                                                                           
    130.                                                                                                                                                                           
    131.                                                                                                                                                                           
    132.                                                                                                                                                                           
    133.                                                                                                                                                                           
    134.                                                                                                                                                                           
    135.                                                                                                                                                                           
    136.

    main.c

    1. #include "pwm.h"
    2. extern void printf(const char *fmt, ...);
    3. void delay_ms(int ms)
    4. {
    5.     int i,j;
    6.     for(i = 0; i < ms;i++)
    7.         for (j = 0; j < 1800; j++);
    8. }
    9.  
    10. int main()
    11. {
    12.     hal_beep_init(); //蜂鸣器初始化
    13.     hal_fan_init();//风扇初始化
    14.     hal_monitor_init();//马达初始化
    15.     while(1)
    16.     {
    17.  
    18.     }
    19.     return 0;
    20. }

    3 实验效果

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  • 原文地址：https://blog.csdn.net/Smallxu_/article/details/133465962