TIM8的通道1怎么设置中断，为什么我的总是提示未定义？

稚冰6

       NVIC_InitStructure.NVIC_IRQChannel = TIM8_UP_TIM13_IRQHandler;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);

下面这个是在STM32F4XX.C中写的
void TIM8_UP_TIM13_IRQHandler(void)  
{       
}

但是我能在STARTUP_STM32F40_42XXX.H里面找到这个 TIM8_UP_TIM13_IRQHandler(void)

可是这个总是提示未定义
Error[Pe020]: identifier "TIM8_UP_TIM13_IRQHandler" is undefined C:\Users\Administrator\Desktop\IAR F407 DEMO+CAN+ClientNet-V1.1\BSP\motodrive.c 934