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()
{
//蜂鸣器 PB6------>TIM4_CH1
//hal_pwm_beep_init();
//风扇 PE9--->TIM1_CH1
hal_pwm_fan_init();
//马达 PF6--->TIM16_CH1
hal_pwm_motor_init();
while(1)
{
}
return 0;
}
include/pwm.h
#ifndef __PW_H__
#define __PW_H__
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_tim.h"
//蜂鸣器 PB6------>TIM4_CH1
void hal_pwm_beep_init();
//风扇 PE9--->TIM1_CH1
void hal_pwm_fan_init();
//马达 PF6--->TIM16_CH1
void hal_pwm_motor_init();
#endif
src/pwm.c
#include "pwm.h"
//蜂鸣器 PB6------>TIM4_CH1
void hal_pwm_beep_init()
{
//RCC章节初始化
//1.使能TIM4组寄存器 MP_APB1ENSETR[2] = 1
RCC->MP_APB1ENSETR |= (0x1 << 2);
//2.使能GPIO组控制器 MP_AHB4ENSETR[1] = 1
RCC->MP_AHB4ENSETR |= (0x1 << 1);
//GPIO章节初始化
//1.设置PB6引脚为复用功能模式 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 AFRL[27:24] = 0010
GPIOB->AFRL &= (~(0xf << 24));
GPIOB->AFRL |= (0x1 << 25);
//TIM4章节初始化 pwm方波频率为1000hz
//1.系统提供时钟源为209mhz
//PSC = 209 -1
TIM4->PSC = 208;
//2.自动重载计数器值 ARR = 1000
TIM4->ARR = 1000;
//3.捕获比较寄存器里面的值 CCR1 = 300
TIM4->CCR1 = 300;
//4.设置pwm模式CCMR1[16][6:4] = 0110
TIM4->CCMR1 &= (~(0x1 << 16));
TIM4->CCMR1 &= (~(0x7 << 4));
TIM4->CCMR1 |= (0X3 << 5);
//CCMR1[3]=1--->设置比较寄存器预加载使能
TIM4->CCMR1 |= (0x1 << 3);
//CCMR1[1:0]=00-->设置通道1为输出模式
TIM4->CCMR1 &= (~(0x3));
//5.设置捕获/比较寄存器输出极性CCER[3] = 1 CCER[1]=1/0 CCER[0]=1
TIM4->CCER |= (0x1 << 3);
TIM4->CCER |= (0X1 << 1);
TIM4->CCER |= (0X1);
//1.CR1[7] = 1--->设置自动重载预加载使能
TIM4->CR1 |= (0x1 << 7);
//2.CR1[6:5] = 00---->设置计数器边沿对齐模式
TIM4->CR1 &= (~(0x3 << 5));
//3.CR1[4] = 1--->设置递减计数方式
TIM4->CR1 |= (0x1 << 4);
//4.CR1[0] = 1 设置计数器使能
TIM4->CR1 |= (0x1);
}
//风扇 PE9--->TIM1_CH1
void hal_pwm_fan_init()
{
//RCC章节初始化
//2.使能GPIO组控制器 MP_AHB4ENSETR[4] = 1
RCC->MP_AHB4ENSETR |= (0x1 << 4);
//1.使能TIM4组寄存器 MP_APB2ENSETR[0] = 1
RCC->MP_APB2ENSETR |= (0x1);
//GPIO章节初始化
//1.设置PB6引脚为复用功能模式 MODER[13:12] = 10
GPIOE->MODER &= (~(0x3 << 18));
GPIOE->MODER |= (0x2 << 18);
//2.设置PB6引脚复用功能为TIM4_CH1功能 AFRL[27:24] = 0010
GPIOE->AFRH &= (~(0xf << 4));
GPIOE->AFRH |= (0x1 << 4);
//TIM4章节初始化 pwm方波频率为1000hz
//1.系统提供时钟源为209mhz
//PSC = 209 -1
TIM1->PSC = 208;
//2.自动重载计数器值 ARR = 1000
TIM1->ARR = 1000;
//3.捕获比较寄存器里面的值 CCR1 = 300
TIM1->CCR1 = 300;
//4.设置pwm模式CCMR1[16][6:4] = 0110
TIM1->CCMR1 &= (~(0x1 << 16));
TIM1->CCMR1 &= (~(0x7 << 4));
TIM1->CCMR1 |= (0X6 << 4);
//CCMR1[3]=1--->设置比较寄存器预加载使能
TIM1->CCMR1 |= (0x1 << 3);
//CCMR1[1:0]=00-->设置通道1为输出模式
TIM1->CCMR1 &= (~(0x3));
//5.设置捕获/比较寄存器输出极性CCER[3] = 1 CCER[1]=1/0 CCER[0]=1
TIM1->CCER &= (~(0x1 << 3));
TIM1->CCER |= (0X1 << 1);
TIM1->CCER |= (0X1);
//1.CR1[7] = 1--->设置自动重载预加载使能
TIM1->CR1 |= (0x1 << 7);
//2.CR1[6:5] = 00---->设置计数器边沿对齐模式
TIM1->CR1 &= (~(0x3 << 5));
//3.CR1[4] = 1--->设置递减计数方式
TIM1->CR1 |= (0x1 << 4);
//4.CR1[0] = 1 设置计数器使能
TIM1->CR1 |= (0x1);
//设置主输出使能
TIM1->BDTR |= (0X1 << 15);
}
//马达 PF6--->TIM16_CH1
void hal_pwm_motor_init()
{
//RCC章节初始化
//2.使能GPIO组控制器 MP_AHB4ENSETR[4] = 1
RCC->MP_AHB4ENSETR |= (0x1 << 5);
//1.使能TIM4组寄存器 MP_APB2ENSETR[0] = 1
RCC->MP_APB2ENSETR |= (0x1 << 3);
//GPIO章节初始化
//1.设置PB6引脚为复用功能模式 MODER[13:12] = 10
GPIOF->MODER &= (~(0x3 << 12));
GPIOF->MODER |= (0x2 << 12);
GPIOF->AFRL &= (~(0xf << 24));
GPIOF->AFRL |= (0x1 << 24);
//TIM4章节初始化 pwm方波频率为1000hz
//1.系统提供时钟源为209mhz
//PSC = 209 -1
TIM16->PSC = 208;
//2.自动重载计数器值 ARR = 1000
TIM16->ARR = 1000;
//3.捕获比较寄存器里面的值 CCR1 = 300
TIM16->CCR1 = 300;
//4.设置pwm模式CCMR1[16][6:4] = 0110
TIM16->CCMR1 &= (~(0x1 << 16));
TIM16->CCMR1 &= (~(0x7 << 4));
TIM16->CCMR1 |= (0X6 << 4);
//CCMR1[3]=1--->设置比较寄存器预加载使能
TIM16->CCMR1 |= (0x1 << 3);
//CCMR1[1:0]=00-->设置通道1为输出模式
TIM16->CCMR1 &= (~(0x3));
//5.设置捕获/比较寄存器输出极性CCER[3] = 1 CCER[1]=1/0 CCER[0]=1
TIM16->CCER &= (~(0x1 << 3));
TIM16->CCER |= (0X1 << 1);
TIM16->CCER |= (0X1);
//1.CR1[7] = 1--->设置自动重载预加载使能
TIM16->CR1 |= (0x1 << 7);
//2.CR1[6:5] = 00---->设置计数器边沿对齐模式
TIM16->CR1 &= (~(0x3 << 5));
//3.CR1[4] = 1--->设置递减计数方式
TIM16->CR1 |= (0x1 << 4);
//4.CR1[0] = 1 设置计数器使能
TIM16->CR1 |= (0x1);
//设置主输出使能
TIM16->BDTR |= (0X1 << 15);
}