基于stm32f103vet6的pwm呼吸灯

基于stm32f103vet6的pwm呼吸灯 Õâ?ö?ÌÐòÎÒÇ×?â?ýÁË??ÎÒÓõÄÊÇ?Ü???æ?ª???åV5.0º?Êý?Ì?þ?âÓõÄ3.5 #include "stm32f10x.h" #include "stm32f10x_gpio.h" void RCC_Configuration(void); void TIM_GPIO_Config(void); void PWM_Mode_Config(void); int main(void) { u8 led_fx=1;//µÆÁÁµÄ??Ïò??ÓÐÁÁµ??µ??ºÍ?µµ?ÁÁ??ºôÎüµÆ?ÍÊÇÕâÑù???äµÄ u16 led_dt=0; RCC_Configuration(); TIM_GPIO_Config(); PWM_Mode_Config(); while(1) { delay_nms(10); if(led_fx==1)// {led_dt++;} else{led_dt--;} if(led_dt>100)//ÏÂÃæ?ÌÐòµÄ??Ê?ÖÜÆÚÊÇ100??ËùÒÔled_dt?Óµ?100?Í×Ô?õµ?0??Ò??ÍÊÇpwmÊä ?ö?ß/µÍµçÆ??ÖÐøÊ??äµÄ???Ì?? led_fx=0; if(led_dt==0) led_fx=1; TIM_SetCompare1(TIM4,led_dt);//?Ñled_dtµÄÖµË͵???Ê?Æ?4µÄCCR?Ä?æÆ?ÖÐ?Ä?äÕ??Õ?È??? ÍÊǺóÃæÌáµ?µÄÌø?äÖµpulse } } void TIM_GPIO_Config(void)//ÅäÖõÄÊÇPB6?Ë?ÚµÄ??ÓÃÍÆÍìÊä?ö??ÒòΪÊä?öPWM?? { GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB,&GPIO_InitStructure); } void RCC_Configuration(void) { SystemInit();//?õÊ???ϵÍ?Ê?ÖÓ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO,ENABLE); //Ê?ÄÜ?Ë?ÚBÊ?ÖÓºÍ??ÓÃ??ÄÜÊ?ÖÓ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE); //Ê?ÄÜ??Ê?Æ?Ê?ÖÓ } void PWM_Mode_Config(void) { u32 CCR2_Val; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; TIM_TimeBaseStructure.TIM_Prescaler = 1; //Ô??ÖƵÆ?Ϊ1?ÍÊÇ??Ê?Æ?µÄ??×?ƵÂÊΪ36M???ñÔò(Ϊ0?òÕßÆäËûµÄÊýÊ?,TIMclock=72M/(pres+1))Ϊ72M TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//ÏòÉÏ?ÆÊý TIM_TimeBaseStructure.TIM_Period =99; //36M/(99+1)=360K TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure); TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //????Ì?TIMx_CNT