STM32F1常用外设介绍

uint16_t TIM_GetPrescaler(TIM_TypeDef* TIMx);

void Timer_Init(void)

{

        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);//开启TIM2时钟

        

        TIM_InternalClockConfig(TIM2);//使用内部时钟

        

        TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;//定义时基单元结构体

        TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;//设置不分频

        TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;//设置向上计数

        TIM_TimeBaseInitStructure.TIM_Period = 10000 - 1;//ARR自动重装值

        TIM_TimeBaseInitStructure.TIM_Prescaler = 7200 - 1;//PSC不分频

        TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;//重复计数器的值，高级定时器特有

        TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);//写入参数

        

        TIM_ClearFlag(TIM2, TIM_FLAG_Update);//清除更新标志位

        TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);//中断输出

        

        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//中断优先级分组

        

        NVIC_InitTypeDef NVIC_InitStructure;//NVIC结构体

        NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;//定时器通道

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;//抢占优先级

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;//响应优先级

        NVIC_Init(&NVIC_InitStructure);//写入参数

        

        TIM_Cmd(TIM2, ENABLE);//开启定时器

}



/*

void TIM2_IRQHandler(void)

{

        if (TIM_GetITStatus(TIM2, TIM_IT_Update) == SET)//判断是否中断溢出

        {

                

                TIM_ClearITPendingBit(TIM2, TIM_IT_Update);//清除中断标志位

        }

}

*/

void TIM_OC1Init(TIM_TypeDef* TIMx, TIM_OCInitTypeDef* TIM_OCInitStruct);

void TIM_OC2Init(TIM_TypeDef* TIMx, TIM_OCInitTypeDef* TIM_OCInitStruct);

void TIM_OC3Init(TIM_TypeDef* TIMx, TIM_OCInitTypeDef* TIM_OCInitStruct);

void TIM_OC4Init(TIM_TypeDef* TIMx, TIM_OCInitTypeDef* TIM_OCInitStruct);

void TIM_ForcedOC1Config(TIM_TypeDef* TIMx, uint16_t TIM_ForcedAction);

void TIM_ForcedOC2Config(TIM_TypeDef* TIMx, uint16_t TIM_ForcedAction);

void TIM_ForcedOC3Config(TIM_TypeDef* TIMx, uint16_t TIM_ForcedAction);

void TIM_ForcedOC4Config(TIM_TypeDef* TIMx, uint16_t TIM_ForcedAction);

void TIM_OC1PreloadConfig(TIM_TypeDef* TIMx, uint16_t TIM_OCPreload);

void TIM_OC2PreloadConfig(TIM_TypeDef* TIMx, uint16_t TIM_OCPreload);

void TIM_OC3PreloadConfig(TIM_TypeDef* TIMx, uint16_t TIM_OCPreload);

void TIM_OC4PreloadConfig(TIM_TypeDef* TIMx, uint16_t TIM_OCPreload);

void PWM_Init(void)

{

        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);//开启TIM2时钟

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//开启GPIO时钟

        

        GPIO_InitTypeDef GPIO_InitStructure;//定义GPIO结构体

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//复用推挽输出

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;//开启引脚

        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//配置响应速度

        GPIO_Init(GPIOA, &GPIO_InitStructure);//写入参数

        

        TIM_InternalClockConfig(TIM2);//使用内部时钟

        

        TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;//配置时基单元

        TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;//不分频

        TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数

        TIM_TimeBaseInitStructure.TIM_Period = 100 - 1;                //ARR

        TIM_TimeBaseInitStructure.TIM_Prescaler = 36 - 1;                //PSC

        TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;//重复计数器

        TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);//写入参数

        

        TIM_OCInitTypeDef TIM_OCInitStructure;//定义输出比较结构体

        TIM_OCStructInit(&TIM_OCInitStructure);//给结构体赋默认值

        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//PWM1模式

        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//有效电平为高电平

        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//使能

        TIM_OCInitStructure.TIM_Pulse = 0;                //CCR

        TIM_OC3Init(TIM2, &TIM_OCInitStructure);//写入参数

        

        TIM_Cmd(TIM2, ENABLE);//开启时钟

}



void PWM_SetCompare3(uint16_t Compare)

{

        TIM_SetCompare3(TIM2, Compare);//设置CCR3的值

}