枚举失败

Project/Src/rt-thread/board.c

@@ -99,6 +99,13 @@ void mpu_init(void)
 
 const libc_device_file *g_usart;
 
+
+// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>ӣ<EFBFBD>25m<35><6D><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA>֤usbΪ48m<38><6D><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD>ֻ<EFBFBD><D6BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ168m
+void reconfig_clock(void) {
+  RCC_PLLConfig(RCC_PLLSource_HSE, 25, 336, 2, 7);
+  SystemCoreClock = 168000000;
+}
+
 /**
  * This function will initial your board.
  */
@@ -106,6 +113,7 @@ void rt_hw_board_init()
 {
 	// NVIC_SetVectorTable(NVIC_VectTab_FLASH,(u32)128*1024);
 	NVIC_SetVectorTable(NVIC_VectTab_FLASH,(u32)0);
+	reconfig_clock();
 	_SysTick_Config (SystemCoreClock/1000);
 	NVIC_SetPriority (SysTick_IRQn, (1<<__NVIC_PRIO_BITS) - 1);
 	LED_Init();