/* System Clocks Configuration */ RCC_Configuration(); /* GPIO Configuration */ GPIO_Configuration(); /* TIM1 Configuration --------------------------------------------------- TIM1CLK = SystemCoreClock, Prescaler = 0, TIM1 counter clock = SystemCoreClock SystemCoreClock is set to 72 MHz for Low-density, Medium-density, High-density and Connectivity line devices and to 24 MHz for Low-Density Value line and Medium-Density Value line devices The objective is to generate 7 PWM signal at 17.57 KHz: - TIM1_Period = (SystemCoreClock / 17570) - 1 The channel 1 and channel 1N duty cycle is set to 50% The Timer pulse is calculated as follows: - ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100 ----------------------------------------------------------------------- */ /* Compute the value to be set in ARR regiter to generate signal frequency at 17.57 Khz */ TimerPeriod = (SystemCoreClock / 17570 ) - 1; /* Compute CCR1 value to generate a duty cycle at 50% for channel 1 and 1N */ Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10); /* Time Base configuration */ TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseStructure.TIM_Period = TimerPeriod; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); /* Channel 1 Configuration in PWM mode */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; TIM_OCInitStructure.TIM_Pulse = Channel1Pulse; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; TIM_OC1Init(TIM1, &TIM_OCInitStructure); /* TIM1 counter enable */ TIM_Cmd(TIM1, ENABLE); /* TIM1 Main Output Enable */ TIM_CtrlPWMOutputs(TIM1, ENABLE); -------------------------------------------------------------------- 以上是官方例程，请参考！ 楼主确实IO初始化和 TIM_CtrlPWMOutputs(TIM1, ENABLE); 不妨试试！ 另外，仿真和脱机运行会不一致是正常的！
