用TIM1产生PWM 无波形输出仿真器TIM1->CCR1一直是初始值不变且不为0（占空比在变的情况下）

静心潜力 · 发表于 2014-6-22 21:37:42

[mw_shl_code=c,true]void Timer1_configuration() { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM1_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; TIM_DeInit(TIM1); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA| RCC_APB2Periph_AFIO|RCC_APB2Periph_TIM1, ENABLE); //****** TIM1 CH1(PA8) ****************************** GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //???????ê???? GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); TIM1_TimeBaseStructure.TIM_Period = 7200-1; // 0xFFFF; ???????? !@#$%^&*()~ TIM1_TimeBaseStructure.TIM_Prescaler = 10-1; //0xF; ·??? TIM1_TimeBaseStructure.TIM_ClockDivision = 0x0; TIM1_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM1_TimeBaseStructure.TIM_RepetitionCounter= 0x00; //?è?????????????÷??;RCR?ò???????÷??????????0???á?ú?ú !@#$%^&*()~ //?????ü?????????????÷??????RCR???¨N?©????????????????? TIM_TimeBaseInit(TIM1,&TIM1_TimeBaseStructure); // ????×????±??????72MHz,????=72M/(36000-1+1)/1000 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; TIM_OCInitStructure.TIM_Pulse = 4000; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; //TIM_OCInitStructure.TIM_OCIdleState=TIM_OCIdleState_Reset; //TIM_OCInitStructure.TIM_OCNIdleState=TIM_OCNIdleState_Reset; TIM_OC1Init(TIM1,&TIM_OCInitStructure); //TIM_OC4Init(TIM1,&TIM_OCInitStructure); TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); // TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable); TIM_ARRPreloadConfig(TIM1, ENABLE); TIM_Cmd(TIM1,ENABLE); TIM_CtrlPWMOutputs(TIM1,ENABLE); } [/mw_shl_code]