STM32PWM输出
STM32F103RCT6
各定时器通道和重映射
/*****************
TIM1_CH1 PA8
TIM1_CH2 PA9
TIM1_CH3 PA10
TIM1_CH4 PA11
TIM2_CH1 PA0, PA15
TIM2_CH2 PA1, PB3
TIM2_CH3 PA2, PB10
TIM2_CH4 PA3, PB11
TIM3_CH1 PA6, PB4, PC6
TIM3_CH2 PA7, PB5, PC7
TIM3_CH3 PB0, PC8
TIM3_CH4 PB1, PC9
TIM4_CH1 PB6
TIM4_CH2 PB7
TIM4_CH3 PB8
TIM4_CH4 PB9
TIM5_CH1 PA0
TIM5_CH2 PA1
TIM5_CH3 PA2
TIM5_CH4 PA3
TIM8_CH1 PC6
TIM8_CH2 PC7
TIM8_CH3 PC8
TIM8_CH4 PC9
****************/
定时器1.8和2.3.4.5有编码器功能，其他没，而且都是通道1.2
//定时器3通道2，部分重映射PB5
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定时器3时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射 TIM3_CH2->PB5 //Partial是部分的意思，部分重映射是指通道一和通道二映射到PB5和PB6，通道34不变，完全重映射是指通道1-4全部重新映射
//设置该引脚为复用输出功能,输出TIM3 CH2的PWM脉冲波形 GPIOB.5
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
//初始化TIM3
TIM_TimeBaseStructure.TIM_Period = arr; //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 =psc; //设置用来作为TIMx时钟频率除数的预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
//初始化TIM3 Channel2 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OC2Init(TIM3, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM3 OC2
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); //使能TIM3在CCR2上的预装载寄存器
TIM_Cmd(TIM3, ENABLE); //使能TIM3
}
