timer

TIM_HandleTypeDef htim2;
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *phtim){
    if(phtim->Instance == TIM2){
        //do something
    }
}
void TIM2_IRQHandler(){
    HAL_TIM_IRQHandler(&htim2);

}
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *phtim){
    if(phtim->Instance == TIM2){
        __HAL_RCC_TIM2_CLK_ENABLE();
        HAL_NVIC_SetPriority(TIM2_IRQn, 2, 0);
        HAL_NVIC_EnableIRQ(TIM2_IRQn);
    }
}
void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *phtim){
    if(phtim->Instance == TIM2){
        __HAL_RCC_TIM2_CLK_ENABLE();
    }
}
void tim2_init_interrupt(unsigned short autoreload, unsigned short prescaler){

    htim2.Instance = TIM2;
    htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim2.Init.Period = autoreload;
    htim2.Init.Prescaler = prescaler;
    HAL_TIM_Base_Init(&htim2);

}
void tim2_init_pwm_ch4(unsigned short autoreload, unsigned short prescaler){
    GPIO_InitTypeDef gpio;
    TIM_OC_InitTypeDef timoc;
    htim2.Instance = TIM2;
    htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim2.Init.Period = autoreload;
    htim2.Init.Prescaler = prescaler;
    HAL_TIM_PWM_Init(&htim2);
    timoc.OCMode = TIM_OCMODE_PWM1;
    timoc.Pulse = autoreload / 2;
    timoc.OCPolarity = TIM_OCPOLARITY_LOW;
    gpio.Mode = GPIO_MODE_AF_PP;
    gpio.Pull = GPIO_PULLUP;
    gpio.Speed = GPIO_SPEED_HIGH;
    gpio.Alternate = GPIO_AF1_TIM2;
    gpio.Pin = GPIO_PIN_11;
    HAL_GPIO_Init(GPIOB, &gpio);
    HAL_TIM_PWM_ConfigChannel(&htim2, &timoc, TIM_CHANNEL_4);
}
void tim2_pwmch4_setcompare(unsigned short cmpval){
    htim2.Instance->CCR4 = cmpval;
}