stm32f103zet6同时控制高级定时器tim8和通用定时器tim5输出pwm波，控制tim8的ch2和ch4单个引脚输出pwm时，ch1和ch3始终输出高电平，请问怎样解决？
```c
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //
TIM_TimeBaseStructure.TIM_Period = 10000-1;
TIM_TimeBaseStructure.TIM_Prescaler = 10000;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 9999;
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(TIM5, &TIM_OCInitStructure); //
TIM_OC2Init(TIM5, &TIM_OCInitStructure); //
TIM_Cmd(TIM5, DISABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE); //
TIM_TimeBaseStructure.TIM_Period =10000-1;
TIM_TimeBaseStructure.TIM_Prescaler = 10000;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 9999;
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(TIM8, &TIM_OCInitStructure); //
TIM_OC2Init(TIM8, &TIM_OCInitStructure); //
TIM_OC3Init(TIM8, &TIM_OCInitStructure); //
TIM_OC4Init(TIM8, &TIM_OCInitStructure); //
TIM_Cmd(TIM8, DISABLE);
```
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本章教程为大家讲解定时器应用之TIM1 – TIM14所有定时器的PWM实现。实际项目中用到的地方较多，如电机控制、无源蜂鸣器、显示屏背光等场合。
目录
第27章 STM32F407的定时器应用之TIM1-TIM14的PWM实现