1、单独跑APP，运行正常。2、把usb cdc初始化的函数去掉，boot跳转到app，运行也正常。
一旦初始化了usb，就直接卡死在usb那。
boot的跳转函数用的官方bsp里的升级demo里的代码：
- void IAP_Jump(uint32_t dwAddr)
- {
- uint32_t dwStkPtr, dwJumpAddr;
- uint32_t i = 0;
- dwStkPtr = *(UINT32 *)dwAddr;
- dwJumpAddr = *(UINT32 *)(dwAddr + sizeof(UINT32));
- if ((dwStkPtr < SRAM_BASE) || ((dwStkPtr & 0xFF000000) != SRAM_BASE || (dwJumpAddr < FLASH_APP1_ADDR) || ((dwJumpAddr & 0xFF000000) != FLASH_BASE)))
- return;
- for (i = 0; i < 1000000; i ++)
- {
- __NOP();
- }
- RCC->APB2RST = 0xFFFF;
- RCC->APB2RST = 0;
- RCC->APB1RST = 0xFFFF;
- RCC->APB1RST = 0;
- RCC->APB2EN = 0;
- RCC->APB1EN = 0;
- RCC->AHBRST = 0xFFFF;
- RCC->AHBRST = 0;
- BIT_SET(RCC->CTRL, RCC_CTRL_HSIEN);
- /* Reset SW, AHBPSC, APB1PSC, APB2PSC, ADCPSC and CLKOUT bits */
- BIT_CLEAR(RCC->CFG, RCC_CFG_SYSCLKSEL | RCC_CFG_AHBPSC | \
- RCC_CFG_APB1PSC | RCC_CFG_APB2PSC | \
- RCC_CFG_ADCPSC | RCC_CFG_CLKOUT);
- /* Reset HSEEN, HSECFDEN and PLLEN bits */
- BIT_CLEAR(RCC->CTRL, RCC_CTRL_HSEEN | RCC_CTRL_HSECFDEN | \
- RCC_CTRL_PLLEN);
- /* Reset HSEBYPS bit */
- BIT_CLEAR(RCC->CTRL, RCC_CTRL_HSEBYPS);
- /* Reset PLLRC, PLLHSEPSC, PLLMUL, USBPSC and PLLRANGE bits */
- BIT_CLEAR(RCC->CFG, RCC_CFG_PLLRC | RCC_CFG_PLLHSEPSC | \
- RCC_CFG_PLLMULT | RCC_CFG_USBPSC | RCC_CFG_PLLRANGE);
- /* Disable all interrupts and clear pending bits */
- RCC->CLKINT = RCC_CLKINT_LSISTBLFC | RCC_CLKINT_LSESTBLFC | \
- RCC_CLKINT_HSISTBLFC | RCC_CLKINT_HSESTBLFC | \
- RCC_CLKINT_PLLSTBLFC | RCC_CLKINT_HSECFDFC;
- SET_MSP(dwStkPtr);
- pfTarget = (void (*)(void))dwJumpAddr;
- pfTarget();
- }
app里重定位向量表
请教大家，哪里有问题，提供个思路
| 
楼主
