Content originally posted in LPCWare by chucks13 on Mon Mar 07 11:46:33 MST 2011
Hello, I am new to the forums, so if the is an FAQ, please forgive me
I have a target board based on the LPCXpresso 1114 board. My target board has no crystal, because I was assured that it run without it using the PLL to drive the system clock, up to at least 48 Mhz, and hopefully 50. The standard examples which I believe are suppose to activate the PLL have on this line:
while (!(LPC_SYSCON->SYSPLLSTAT & 0x01)); /* Wait Until PLL Locked */
This is in the library SystemInit() function. My board makes it to this line and hangs. The obvious reason is that the PLL never acquires a lock. I have not made any changes to the initialization code.
I fear that I have missed something, like an external resistor that the LPCXpresso board with the crystal doesn't need, or the standard examples needs something more.
Thanks for reading my post.
Chuck