void hsync_timer_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

/* Time base configuration */
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 100;
TIM_TimeBaseStructure.TIM_Prescaler = 72-1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

/* TIM2 PWM2 Mode configuration: Channel1 */
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 20;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);

/* TIM2 configuration in Input Capture Mode */

TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0;
TIM_ICInit(TIM2, &TIM_ICInitStructure);

/* One Pulse Mode selection */
TIM_SelectOnePulseMode(TIM2, TIM_OPMode_Single);
/* Input Trigger selection */
TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);
/* Slave Mode selection: Trigger Mode */
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Trigger);
//TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE)
TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);

TIM_Cmd(TIM2, ENABLE);
NVIC_EnableIRQ(TIM2_IRQn);
}

void TIM2_IRQHandler(void)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);
SPI1->DR |= 0xCCCC;
SPI2->DR |= 0x3333;
}