stm32f103c8 定时器1配置为比较输出模式，CH1N没有输出？

lcydusk · 发表于 2014-5-12 19:58:33

stm32f103c8 定时器1配置为比较输出模式，CH1-CH4都有输出，但CH1N、CH2N、CH3N没有输出？为什么呢？CH1N在比较模式下能用吗？[/mw_shl_code]
代码：[/mw_shl_code]

	void PWM_Configuration(void)

{

   /* TIM1 Configuration ---------------------------------------------------

 定时器1配置：输出四路PWM波形，频率，占空比可调

  ----------------------------------------------------------------------- */

 

 TIM_DeInit(TIM1);

  /* Time Base configuration */

  TIM_TimeBaseStructure.TIM_Prescaler = 4;

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseStructure.TIM_Period = 0xffff;

  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_Toggle;        //输出比较模式

 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;   //正向通道有效

 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputState_Enable;   //反向通道无效

 TIM_OCInitStructure.TIM_Pulse = CCR1_Val;              //占空时间

 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCNPolarity_High;      //输出极性

 TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;     //互补端的极性

 TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;

 TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Set;

 TIM_OC1Init(TIM1,&TIM_OCInitStructure);               //通道1

 TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Disable);

 

 

 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;        //输出比较模式

 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;   //正向通道有效

 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputState_Enable;   //反向通道无效

 TIM_OCInitStructure.TIM_Pulse = CCR2_Val;              //占空时间

 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCNPolarity_High;      //输出极性

 TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;     //互补端的极性

 TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;

 TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Set;


	 TIM_OC2Init(TIM1,&TIM_OCInitStructure);               //通道2

 TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Disable);

 

 TIM_OCInitStructure.TIM_Pulse = CCR3_Val;             //占空时间

 TIM_OC3Init(TIM1,&TIM_OCInitStructure);              //通道3

 TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Disable);

  

 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;          //输出比较模式

 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;   //正向通道有效

 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputState_Disable;   //反向通道无效

 TIM_OCInitStructure.TIM_Pulse = CCR4_Val;              //占空时间

 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCNPolarity_High;      //输出极性

 TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;     //互补端的极性

 TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;

 TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Set;

 TIM_OCInitStructure.TIM_Pulse = CCR4_Val;             //占空时间

 TIM_OC4Init(TIM1,&TIM_OCInitStructure);              //通道4

 TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Disable);

 /* TIM1 counter enable */

 TIM_Cmd(TIM1,ENABLE);

 /* TIM1 Main Output Enable */

 TIM_CtrlPWMOutputs(TIM1,ENABLE);                                  //必须使能此处的PWM输出，否则没有信号

 TIM_ARRPreloadConfig(TIM1, DISABLE);

 TIM_ClearFlag(TIM1, TIM_FLAG_CC1|TIM_FLAG_CC2|TIM_FLAG_CC3|TIM_FLAG_CC4);

 /* TIM IT enable */

 TIM_ITConfig(TIM1, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);

 

}

 [/mw_shl_code]