void PWM_TIM1(uint16_t arr,uint16_t psc)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //定时器TIM1时钟使能
TIM_DeInit(TIM1);
//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_Period =arr;
//设置用来作为TIMx时钟频率出书的预分频值
TIM_TimeBaseStructure.TIM_Prescaler =psc;
//设置时钟分割
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
//设置计数模式
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
//初始化参数
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_2); //TIM1channel2
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_2); //TIM1channel3
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE);
//PA9
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//PA10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//TIM1的channel2
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
//TIM1的channel3
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_Cmd(TIM1, ENABLE); //使能TIM1
}
int main()
{
PWM_TIM1(999,1);//频率为：48MHZ/(999+1)/(1+1)=24KHZ
TIM_SetCompare2(TIM1,499); //占空比为50%方波
PWM_TIM1(399,1);//频率为：48MHZ/(399+1)/(1+1)=
TIM_SetCompare3(TIM1,199); //占空比为50%方波
}
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