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楼主 |
发表于 2019-10-15 09:26:05
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void TIM1_PWM_Init(u32 arr)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//使能定时器1时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);//使能GPIO外设模块时钟
//设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形GPIOA8
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_8; //TIM_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIO
GPIO_ResetBits(GPIOA,GPIO_Pin_8);
//初始化TIM1
TIM_TimeBaseStructure.TIM_Period = arr-1; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =71; //设置用来作为TIMx时钟频率除数的预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//TIM向上计数模式
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; //重复计数,一定要=0!
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式1
TIM_OCInitStructure.TIM_Pulse =arr/2-1;//%50的占空比
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性高
TIM_OC1Init(TIM1, &TIM_OCInitStructure);//根据T指定的参数初始化外设TIM1 OC1
TIM_Cmd(TIM1, ENABLE);
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Update);
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);//使能TIM2在CCR2上的预装载寄存器
TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
}
void TIM2_Config(u32 PulseNum)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructure.TIM_Period = PulseNum-1;
TIM_TimeBaseStructure.TIM_Prescaler =0;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_SelectInputTrigger(TIM2, TIM_TS_ITR0);
//TIM_InternalClockConfig(TIM3);
TIM2->SMCR|=0x07; //设置从模式寄存器
//TIM_ITRxExternalClockConfig(TIM2, TIM_TS_ITR0);
//TIM_ARRPreloadConfig(TIM3, ENABLE);
TIM_ITConfig(TIM2,TIM_IT_Update,DISABLE);
//NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_Cmd(TIM2, ENABLE);
}
void Pulse_output(u32 arr,u32 PulseNum)
{
TIM2_Config(PulseNum);
TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
TIM1_PWM_Init(arr);
TIM_CtrlPWMOutputs(TIM1, ENABLE); //高级定时器一定要加上,主输出使能
}
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) // TIM_IT_CC1
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update); // 清除中断标志位
TIM_CtrlPWMOutputs(TIM1, DISABLE); //主输出使能
TIM_Cmd(TIM1, DISABLE); // 关闭定时器
TIM_Cmd(TIM2, DISABLE); // 关闭定时器
TIM_ITConfig(TIM2, TIM_IT_Update, DISABLE);
}
}
这样的 |
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