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TMS320F28379D的Auxillary clock出现问题

Other Parts Discussed in Thread: TMS320F28379D, CONTROLSUITE

我用的是TMS320F28379D芯片,在使用USB通信时出现问题,程序无法加载到RAM,一直停在下面的程序上

SysCtlAuxClockSet(SYSCTL_OSCSRC_XTAL | SYSCTL_PLL_ENABLE | SYSCTL_IMULT(12) | SYSCTL_SYSDIV(4));

单步调试时,进入该函数,发现程序最终是停止在了这一行:

//Wait for the SYSPLL lock
while(ClkCfgRegs.AUXPLLSTS.bit.LOCKS != 1)
{
// Uncomment to service the watchdog
// ServiceDog();
}

请问该如何解决?