main函数跑下面代码就行

        懂的就懂，不讲原理，自己看

	MX_TIM2_Init(7,999);__HAL_TIM_SET_COMPARE(&htim2,TIM_CHANNEL_1,500);__HAL_TIM_SET_COMPARE(&htim2,TIM_CHANNEL_2,500);__HAL_TIM_SET_COMPARE(&htim2,TIM_CHANNEL_3,500);__HAL_TIM_SET_COMPARE(&htim2,TIM_CHANNEL_4,500);

   配置函数

void MX_TIM2_Init(u16 Pres,u16 Peri){__HAL_RCC_TIM2_CLK_ENABLE();			//使能定时器2__HAL_RCC_GPIOA_CLK_ENABLE();			//开启GPIOA时钟htim2.Instance=TIM2;            //定时器2htim2.Init.Prescaler=Pres;       //定时器分频htim2.Init.CounterMode=TIM_COUNTERMODE_UP;//向上计数模式htim2.Init.Period=Peri;          //自动重装载值HAL_TIM_PWM_Init(&htim2);       //初始化PWM//-------------------------------------------------------------------TIM_OC_InitTypeDef TIM2_CH1Handler;	TIM2_CH1Handler.OCMode=TIM_OCMODE_PWM1; //模式选择PWM1TIM2_CH1Handler.Pulse=0;            //设置比较值,此值用来确定占空比，默认0TIM2_CH1Handler.OCPolarity=TIM_OCPOLARITY_LOW; //输出比较极性为低  cc1p为0HAL_TIM_PWM_ConfigChannel(&htim2,&TIM2_CH1Handler,TIM_CHANNEL_1);//配置TIM2通道1HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_1);//开启PWM通道2GPIO_InitTypeDef GPIO_Initure;GPIO_Initure.Pin=GPIO_PIN_0;           	//PA0GPIO_Initure.Mode=GPIO_MODE_AF_PP;  	//复用推挽输出GPIO_Initure.Pull=GPIO_PULLUP;          //上拉GPIO_Initure.Speed=GPIO_SPEED_FREQ_HIGH;     //高速GPIO_Initure.Alternate= GPIO_AF2_TIM2;	//PA1复用为TIM2_CH1HAL_GPIO_Init(GPIOA,&GPIO_Initure);//----------------------------------------------------------------------	TIM_OC_InitTypeDef TIM2_CH2Handler;	TIM2_CH2Handler.OCMode=TIM_OCMODE_PWM1; //模式选择PWM1TIM2_CH2Handler.Pulse=0;            //设置比较值,此值用来确定占空比，默认0TIM2_CH2Handler.OCPolarity=TIM_OCPOLARITY_LOW; //输出比较极性为低  cc1p为0HAL_TIM_PWM_ConfigChannel(&htim2,&TIM2_CH2Handler,TIM_CHANNEL_2);//配置TIM2通道2HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_2);//开启PWM通道2GPIO_Initure.Pin=GPIO_PIN_1;           	//PA1GPIO_Initure.Mode=GPIO_MODE_AF_PP;  	//复用推挽输出GPIO_Initure.Pull=GPIO_PULLUP;          //上拉GPIO_Initure.Speed=GPIO_SPEED_FREQ_HIGH;     //高速GPIO_Initure.Alternate= GPIO_AF2_TIM2;	//PA1复用为TIM2_CH2HAL_GPIO_Init(GPIOA,&GPIO_Initure);//------------------------------------------------------------TIM_OC_InitTypeDef TIM2_CH3Handler;	TIM2_CH3Handler.OCMode=TIM_OCMODE_PWM1; //模式选择PWM1TIM2_CH3Handler.Pulse=0;            //设置比较值,此值用来确定占空比，默认比较值为自动重装载值的一半,即占空比为50%TIM2_CH3Handler.OCPolarity=TIM_OCPOLARITY_LOW; //输出比较极性为低  cc1p为0HAL_TIM_PWM_ConfigChannel(&htim2,&TIM2_CH3Handler,TIM_CHANNEL_3);//配置TIM2通道3HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_3);//开启PWM通道3GPIO_Initure.Pin=GPIO_PIN_2;           	//PA2GPIO_Initure.Mode=GPIO_MODE_AF_PP;  	//复用推挽输出GPIO_Initure.Pull=GPIO_PULLUP;          //上拉GPIO_Initure.Speed=GPIO_SPEED_FREQ_HIGH;     //高速GPIO_Initure.Alternate= GPIO_AF2_TIM2;	//PA2复用为TIM2_CH3HAL_GPIO_Init(GPIOA,&GPIO_Initure);
//----------------------------------------------------TIM_OC_InitTypeDef TIM2_CH4Handler;	TIM2_CH4Handler.OCMode=TIM_OCMODE_PWM1; //模式选择PWM1TIM2_CH4Handler.Pulse=0;            //设置比较值,此值用来确定占空比，默认比较值为自动重装载值的一半,即占空比为50%TIM2_CH4Handler.OCPolarity=TIM_OCPOLARITY_LOW; //输出比较极性为低  cc1p为0HAL_TIM_PWM_ConfigChannel(&htim2,&TIM2_CH4Handler,TIM_CHANNEL_4);//配置TIM2通道4HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_4);//开启PWM通道4GPIO_Initure.Pin=GPIO_PIN_3;           	//PA3GPIO_Initure.Mode=GPIO_MODE_AF_PP;  	//复用推挽输出GPIO_Initure.Pull=GPIO_PULLUP;          //上拉GPIO_Initure.Speed=GPIO_SPEED_FREQ_HIGH;     //高速GPIO_Initure.Alternate= GPIO_AF2_TIM2;	//PA3复用为TIM2_CH4HAL_GPIO_Init(GPIOA,&GPIO_Initure);}