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一、本实例所使用资源：

1、 PWM输出：TIM3_CH1(对应管脚PA6)
2、 PWM输出：TIM3_CH2(对应管脚PA7)
3、 MDK 软件仿真

二、步骤

1、 初始化对应GPIO
2、 配置定时器TIM3
3、 main函数调用初始化

三、代码

static void Timer_GPIO_Config(void)
{GPIO_InitTypeDef GPIO_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);}

static void Timer_Config(void)
{TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;TIM_OCInitTypeDef  TIM_OCInitStructure;RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);//TIME BASETIM_TimeBaseStructure.TIM_Period = Timer_Period;TIM_TimeBaseStructure.TIM_Prescaler = Timer_Prescaler;TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;TIM_TimeBaseStructure.TIM_RepetitionCounter=0;TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);//PWM OUT/* PWM1 Mode configuration: Channel1 */TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;TIM_OCInitStructure.TIM_Pulse = CCR1_Val;TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;TIM_OC1Init(TIM3, &TIM_OCInitStructure);TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);/* PWM1 Mode configuration: Channel2 *///TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;TIM_OCInitStructure.TIM_Pulse = CCR2_Val;TIM_OC2Init(TIM3, &TIM_OCInitStructure);TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);TIM_ARRPreloadConfig(TIM3, ENABLE); //可有可无/* TIM3 enable counter */TIM_Cmd(TIM3, ENABLE);TIM_CtrlPWMOutputs(TIM3,ENABLE); //开启OC  OCN}

void Timer_Init(void)
{Timer_GPIO_Config();Timer_Config();
}

void PWM_Set(uint16_t period,uint16_t pluse,uint8_t channle)//freq=周期
{TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;TIM_OCInitTypeDef  TIM_OCInitStructure;RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);//TIME BASETIM_TimeBaseStructure.TIM_Period = period;TIM_TimeBaseStructure.TIM_Prescaler = Timer_Prescaler;TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;TIM_TimeBaseStructure.TIM_RepetitionCounter=0;TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);/* PWM1 Mode configuration: Channel1 */TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;if(channle==1){TIM_OCInitStructure.TIM_Pulse = pluse;TIM_OC1Init(TIM3, &TIM_OCInitStructure);TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);}else if(channle==2){/* PWM1 Mode configuration: Channel2 */TIM_OCInitStructure.TIM_Pulse = pluse;TIM_OC2Init(TIM3, &TIM_OCInitStructure);TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);}TIM_ARRPreloadConfig(TIM3, ENABLE); /* TIM3 enable counter */TIM_Cmd(TIM3, ENABLE);TIM_CtrlPWMOutputs(TIM3,ENABLE); //开启OC  OCN
}

四、逻辑分析仪仿真

int main(void)
{Timer_Init();PWM_Set(1000,500,1);Delay_Ms(500);PWM_Set(3000,900,1);while(1){}
}