求助STM8S TIM1输出PWM的问题

苦尽甘来 · 发表于 2016-6-3 14:43:23

本帖最后由苦尽甘来于 2016-6-3 15:15 编辑

使用STM8S 的TIM1输出PWM CH1和CH1N的波形如下图，不正常为啥CH1（蓝色)的波形不正常？其他3个通道都正常。

CH2和CH2N的波形如下，很正常

代码：
   TIM1_DeInit();
   TIM1_TimeBaseInit(79, TIM1_COUNTERMODE_UP, 9, 0);          // 10 配置预分频，计数模式，周期，重装值

   TIM1_OC1Init(TIM1_OCMODE_PWM2, TIM1_OUTPUTSTATE_DISABLE, TIM1_OUTPUTNSTATE_ENABLE,          //初始化OC1
               5, TIM1_OCPOLARITY_HIGH, TIM1_OCNPOLARITY_HIGH, TIM1_OCIDLESTATE_SET,
               TIM1_OCNIDLESTATE_SET);

   TIM1_OC2Init(TIM1_OCMODE_PWM1, TIM1_OUTPUTSTATE_DISABLE, TIM1_OUTPUTNSTATE_ENABLE, 5,    //初始化OC2
               TIM1_OCPOLARITY_HIGH, TIM1_OCNPOLARITY_LOW, TIM1_OCIDLESTATE_RESET,
               TIM1_OCNIDLESTATE_SET);

   TIM1_OC1PolarityConfig(TIM1_OCPOLARITY_LOW);                                           //设置输出极性
   TIM1_OC1NPolarityConfig(TIM1_OCNPOLARITY_LOW);

   TIM1_OC2PolarityConfig(TIM1_OCPOLARITY_HIGH);
   TIM1_OC2NPolarityConfig(TIM1_OCNPOLARITY_LOW);

   TIM1_CCxCmd(TIM1_CHANNEL_1|TIM1_CHANNEL_2,ENABLE);          //设置CCxE，OCxREF 被定向到OCx或者OCxN.
   TIM1_CCxNCmd(TIM1_CHANNEL_1|TIM1_CHANNEL_2,ENABLE);

   TIM1_CCPreloadControl(ENABLE);

   TIM1_OC1PreloadConfig(ENABLE);
   TIM1_PrescalerConfig(7, TIM1_PSCRELOADMODE_IMMEDIATE);  // 配置分频
   TIM1_BDTRConfig(TIM1_OSSISTATE_ENABLE, TIM1_LOCKLEVEL_OFF, 3, TIM1_BREAK_DISABLE, TIM1_BREAKPOLARITY_LOW, TIM1_AUTOMATICOUTPUT_ENABLE);
   TIM1_SetAutoreload(0x0A);
   TIM1_ARRPreloadConfig(ENABLE);
   TIM1_Cmd(ENABLE);
   TIM1_CtrlPWMOutputs(ENABLE);