/******************************************************************************************
* 函數名稱 ： TIM3_Configuration
* 功能描述 ： TIM3初始化函數
* 參數 ： 無
* 返回值 ： 無
* 全局變量 ： 無
* 全局靜態(tài)變量： 無
* 局部靜態(tài)變量： 無
******************************************************************************************/
void TIM3_Configuration( )
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE); //打開APB2外設
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //開時鐘
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; //PA6 PA7
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //要改為 AF_PP
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //要改為 AF_PP
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_DeInit(TIM3); //將TIM3寄存器設為缺省值
TIM_TimeBaseStructure.TIM_Period=72-1; //ARR的值,計數周期
TIM_TimeBaseStructure.TIM_Prescaler=36-1; //分頻 CK_INT=2MHz 36分頻
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上計數模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //初始化定時器3
TIM_TimeBaseStructure.TIM_Period=72-1; //ARR的值,計數周期
TIM_TimeBaseStructure.TIM_Prescaler=36-1; //分頻 CK_INT=2MHz 36分頻
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上計數模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //初始化定時器3
//通道1
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle ;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //輸出使能
TIM_OCInitStructure.TIM_Pulse = 1-1 ; //待捕獲比較寄存器的值 CRR
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //高電平有效
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle ;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //輸出使能
TIM_OCInitStructure.TIM_Pulse = 1-1 ; //待捕獲比較寄存器的值 CRR
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //高電平有效
TIM_OC1Init(TIM3, &TIM_OCInitStructure); //通道初始化
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); //預裝載使能
//通道2
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1 ;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //輸出使能
TIM_OCInitStructure.TIM_Pulse = 36-1 ; //待捕獲比較寄存器的值 CRR
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //高電平有效
TIM_OC2Init(TIM3, &TIM_OCInitStructure); //通道初始化
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); //預裝載使能
//通道2
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1 ;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //輸出使能
TIM_OCInitStructure.TIM_Pulse = 36-1 ; //待捕獲比較寄存器的值 CRR
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //高電平有效
TIM_OC2Init(TIM3, &TIM_OCInitStructure); //通道初始化
TIM3->CNT = 0;
TIM_Cmd(TIM3, ENABLE);//打開定時器
}
TIM_Cmd(TIM3, ENABLE);//打開定時器
}