STM8L152M8单片机怎么输出不了PWM？

static void TIM5_Config(void)
{
/* Enable TIM5 clock */
CLK_PeripheralClockConfig(CLK_Peripheral_TIM5, ENABLE);

/* TIM5 Channel1 configuration: PI3 */
GPIO_Init(GPIOI, GPIO_Pin_3, GPIO_Mode_Out_PP_High_Slow);
/*
- TIM1CLK = 2 MHz
- TIM1 counter clock = TIM1CLK / TIM1_PRESCALER+1 = 2 MHz/1+1 = 1 MHz
*/
/* Time base configuration */
TIM5_TimeBaseInit(TIM5_Prescaler_1, TIM5_CounterMode_Up, 65535);
TIM5_OC1Init(TIM5_OCMode_PWM1, TIM5_OutputState_Enable, CCR1_Val, TIM5_OCPolarity_High,
TIM5_OCIdleState_Set);
TIM5_OC1PreloadConfig(ENABLE);
TIM5_ARRPreloadConfig(ENABLE);
TIM5_CtrlPWMOutputs(ENABLE);
TIM5_Cmd(ENABLE);}

问题出在哪里呢？