STM32 timer3

Hi everyone. I wrote this code to run the stm32f0 timer3, which toggle 2 LEDs at a time, but it doesn't work.

Can anyone please help me؟

void TIM3_Init()
{
	 TIM_TimeBaseInitTypeDef TIM3_InitStructure;
		 NVIC_InitTypeDef NVIC_InitStructure;
 
 RCC_APB1PeriphResetCmd(RCC_APB1Periph_TIM3, ENABLE);
		 TIM3_InitStructure.TIM_Prescaler = 359;
		 TIM3_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
		 TIM3_InitStructure.TIM_Period = 199;
		 TIM3_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
		 TIM3_InitStructure.TIM_RepetitionCounter = 0;
		 TIM_TimeBaseInit(TIM3, &TIM3_InitStructure);
 
 TIM_Cmd(TIM3, ENABLE);
 
 NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
		 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	 NVIC_InitStructure.NVIC_IRQChannelPriority = 0x01;
	 NVIC_Init(&NVIC_InitStructure);
 
		 TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
 
 
}
 
void TIM3_IRQHandler(void)
{
 
	if(TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET){
 
 TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
		GPIOB->ODR ^= GPIO_Pin_2|GPIO_Pin_3;
 
 
	}
}