学习目标

1. 学习如何在STC8H上配置PWMB
2. 掌握PWMB的各个配置
3. 学习如何使用PWMB控制震动马达

4. 掌握调试PWM的方法

   学习内容

   PWMB的应用

   实现不同占空比下的震动的效果

   拷贝依赖

5. STC8H_PWM.h``STC8H_PWM.c

6. NVIC.h``NVIC.c
7. Switch.h

   实现main.c

   ```c

   include “Config.h”

   include “Delay.h”

   include “GPIO.h”

   include “STC8H_PWM.h”

   include “NVIC.h”

   include “Switch.h”

define MOTOR P01

define PREQ 1000

define PERIOD (MAIN_Fosc / PREQ)

void GPIO_config(void) { GPIO_InitTypeDef GPIO_InitStructure; //结构定义 GPIO_InitStructure.Pin = GPIO_Pin_1; //指定要初始化的IO, GPIO_InitStructure.Mode = GPIO_PullUp; //指定IO的输入或输出方式,GPIO_PullUp,GPIO_HighZ,GPIO_OUT_OD,GPIO_OUT_PP GPIO_Inilize(GPIO_P0, &GPIO_InitStructure);//初始化 } void PWM_config(void) { PWMx_InitDefine PWMx_InitStructure;

PWMx_InitStructure.PWM_Mode            =    CCMRn_PWM_MODE1;    //模式,        CCMRn_FREEZE,CCMRn_MATCH_VALID,CCMRn_MATCH_INVALID,CCMRn_ROLLOVER,CCMRn_FORCE_INVALID,CCMRn_FORCE_VALID,CCMRn_PWM_MODE1,CCMRn_PWM_MODE2
PWMx_InitStructure.PWM_Duty            =  0;    //PWM占空比时间, 0~Period
PWMx_InitStructure.PWM_EnoSelect  = ENO6P;                //输出通道选择,    ENO1P,ENO1N,ENO2P,ENO2N,ENO3P,ENO3N,ENO4P,ENO4N / ENO5P,ENO6P,ENO7P,ENO8P
PWM_Configuration(PWM6, &PWMx_InitStructure);            //初始化PWM,  PWMA,PWMB
PWMx_InitStructure.PWM_Period   = PERIOD - 1;                    //周期时间,   0~65535
PWMx_InitStructure.PWM_DeadTime = 0;                    //死区发生器设置, 0~255
PWMx_InitStructure.PWM_MainOutEnable= ENABLE;            //主输出使能, ENABLE,DISABLE
PWMx_InitStructure.PWM_CEN_Enable   = ENABLE;            //使能计数器, ENABLE,DISABLE
PWM_Configuration(PWMB, &PWMx_InitStructure);            //初始化PWM通用寄存器,  PWMA,PWMB
PWM6_SW(PWM6_SW_P01);                    //PWM6_SW_P21,PWM6_SW_P54,PWM6_SW_P01,PWM6_SW_P75
NVIC_PWM_Init(PWMB,DISABLE,Priority_0);

}

void main(){ PWMx_Duty duty; u8 duty_percent = 0; // 0 - 100

EAXSFR();
GPIO_config();
PWM_config();
duty.PWM6_Duty = 0;
UpdatePwm(PWM6, &duty);
while(1){
    delay_ms(10);
    // 设置占空比
    duty.PWM6_Duty = PERIOD * duty_percent / 100;
    UpdatePwm(PWMB, &duty);
    // 修改占空比 0 -> 100
    duty_percent++;
    if(duty_percent > 100){
        duty_percent = 0;
    }
}

} ```

练习题

1. 实现马达震动。
2. 分析电动牙刷从原理图到编码实现过程中的环节。