使用的是STM32F030F4P6，PA9复用为TIM1_CH2为输出比较翻转模式，PA6复用为TIM3_CH1为PWM输出模式。
TIM1为主模式，OC2REF为触发输出。
TIM3为从模式，从定时器1获得触发，并设置为门控模式。
最终要达到的效果是当PA9为高电平的时候PA6输出PWM波，当PA9为低电平的时候PA6停止PWM输出。
最终的效果却像图上那样是反过来的（变成PA9为低电平的时候PA6输出PWM波，当PA9为高电平的时候PA6停止PWM输出）黄色为PA9，蓝色为PA6。
下面是定时器配置代码，跪求帮忙找找原因。
void TIM1_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //使能定时器时钟
//引脚启用复用定时器功能
GPIO_InitStructure.GPIO_Pin = TIM1_OC_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(TIM1_OC_PORT, &GPIO_InitStructure);
GPIO_PinAFConfig(TIM1_OC_PORT, TIM1_OC_SRC, TIM1_OC_AF);
//使能定时器中断
NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//定时器时基配置
TIM_TimeBaseStructure.TIM_Period = 65535;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
//定时器输出比较配置
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; //输出比较翻转模式
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //输出状态启用
TIM_OCInitStructure.TIM_Pulse = 1000;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性高
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Disable); //预装载禁用
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_OC2Ref); //选择主模式的触发输出
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable); //主从模式使能
TIM_CtrlPWMOutputs(TIM1, ENABLE); //使能主输出
TIM_ITConfig(TIM1, TIM_IT_CC2, ENABLE);
}
void TIM1_StartOutput(uint16_t t_Pulse)
{
TIM_ClearFlag(TIM1, TIM_FLAG_Update); //清零更新标志
TIM1->CNT = 0; //清零计数器的值
TIM1->CCR2= t_Pulse; //装入比较值 CH1
TIM_Cmd(TIM1, ENABLE); //使能定时器17
}
void TIM3_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
//引脚启用PWM输出
GPIO_InitStructure.GPIO_Pin = TIM3_PWM_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //高速
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //无上下拉
GPIO_Init(TIM3_PWM_PORT, &GPIO_InitStructure);
GPIO_PinAFConfig(TIM3_PWM_PORT, TIM3_PWM_SRC, TIM3_PWM_AF); //启用定时器引脚
//定时器时基配置
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定时器3时钟
TIM_TimeBaseStructure.TIM_Prescaler = 0; //指定时钟为
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseStructure.TIM_Period = TIM3_CH1PWM_PERIOD; //周期时间
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);
//CH1输出配置
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = TIM3_CH1PWM_PULSE;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC1FastConfig(TIM3, TIM_OCFast_Enable); //快速触发
TIM_SelectInputTrigger(TIM3, TIM_TS_ITR0); //选择从模式的触发源 TIM1
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Gated); //从模式选择为 门控模式 高电平计数
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE);
}
void TIM3_StartPWM(uint16_t t_Period,uint16_t t_Pulse)
{
TIM_ClearFlag(TIM3, TIM_FLAG_Update); //清零更新标志
TIM3->CNT = 0; //清零计数器的值
TIM3->ARR = t_Period; //装入周期值
TIM3->CCR1= t_Pulse; //装入占空值
TIM_Cmd(TIM3, ENABLE); //使能定时器3
}
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