加入以下代码后一直进入 HardFault_Handler 请教
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;//????????4
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x03;//??????????3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03;//×???????3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//?????????????¨??
NVIC_Init(&NVIC_InitStructure);//????NVIC
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