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标题: 关于NUC123从LDROM切换到APROM启动问题 [打印本页]

作者: sandou2013 时间: 2013-12-21 15:44
标题: 关于NUC123从LDROM切换到APROM启动问题
请大家指教一下，要做的是，当程序检测到USB没有插入，则从APROM中启动。下面这样写怎么跳不进去？
//======================================================
// USB Floating Detect
//======================================================
void UsbFdt(void)
{
      uint8_t u8FLODET = USBD->FLDET.FLDET;

      _DRVUSB_SET_EVF(EVF_FLD);

if (u8FLODET)
      {
         /* USB Plug In */

            if (g_u8UsbState & USB_STATE_ATTACHED)
            {
                  /* Do nothing if it is already attached */
                     return;
            }

            /* Update USB state */
            g_u8UsbState = USB_STATE_ATTACHED;

            /* Init the end points */
            UsbCfg();

         /* Enable USB and enable PHY */
      _DRVUSB_ENABLE_USB();
      }
      else
      {
         /* USB Un-plug */

         /* Update USB state */
            g_u8UsbState = USB_STATE_DETACHED;

            udcOnLine = 0;

         /* Disable USB, Disable remote weak up, and disable PHY */
      _DRVUSB_DISABLE_USB();
               /* Boot from AP */
      RoughDelay(0x200000);
      RESET_TO_AP();//CPU复位，从AP启动,此函数放于主函数的最前面是有用的             while(1)
         continue;
      }

作者: a_ziliu 时间: 2013-12-23 09:41
SYS_UnlockReg(); //en:Unlock protected register bits for user to access
outpw(&FMC->ISPCON, inpw(&FMC->ISPCON) & 0xFFFFFFFC); //boot in aprom
outpw(&SCB->AIRCR, (V6M_AIRCR_VECTKEY_DATA | V6M_AIRCR_SYSRESETREQ));//SYSRESETREQ
while(1);

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