stm32 PWM实现呼吸灯

• 项目：stm32 输出PWM实现呼吸灯效果
• 代码：
  • PWM.c
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    #include "stm32f10x.h"     void PWM_Init(void) {     //PB0默认TIM3_CH3通道     RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);           //配置PB0为复用推挽输出     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);     GPIO_InitTypeDef GPIO_InitStructure;     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;     //复用推挽输出，中断控制来自片上外设（TIM3_CH3），而非输出数据寄存器     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;     GPIO_Init(GPIOB, &GPIO_InitStructure);     //设置TIM3定时器内部时钟源     TIM_InternalClockConfig(TIM3);     //频率为1kHz, 占空比为50%，分辨率为1%     TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;     TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;     TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;     TIM_TimeBaseInitStructure.TIM_Period = 100 - 1;     //ARR     TIM_TimeBaseInitStructure.TIM_Prescaler = 720 - 1;      //PSC     TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;     TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStructure);     //清除更新标志位     TIM_ClearFlag(TIM3, TIM_FLAG_Update);     TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);  //TIM3中断配置使能           TIM_OCInitTypeDef   TIM_OCInitStructure;     TIM_OCStructInit(&TIM_OCInitStructure);     //给结构体赋初始值     TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;       //输出比较模式     TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;   //极性选择     TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;   //输出使能     TIM_OCInitStructure.TIM_Pulse = 0;      //CCR     TIM_OC3Init(TIM3, &TIM_OCInitStructure);     //打开TIM3定时器外设     TIM_Cmd(TIM3, ENABLE);       }     //PWM占空比的函数 void PWM_SetCompare3(uint16_t Compare3) {     TIM_SetCompare3(TIM3, Compare3); }

    　　

  • PWM.h
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    #ifndef __PWM_H #define __PWM_H void PWM_Init(void); void PWM_SetCompare3(uint16_t Compare3);   #endif

    　　

  • main.c
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    #include "stm32f10x.h" #include "Delay.h" #include "OLED.h" #include "PWM.h"   uint8_t i;   int main(void) {     PWM_Init();     //PWM初始化           while(1)        {           for(i = 0; i <= 100; i ++)         {             PWM_SetCompare3(i);     //设置TIM3捕获比较3寄存器的值，即CRR             Delay_ms(10);         }         for(i = 0; i <= 100; i ++)         {             PWM_SetCompare3(100 - i);             Delay_ms(10);         }               } }

    　　

• 参考资料
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