lpcware

LPC824Max board won't work with crystal oscillator settings

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 18, 2016 by lpcware
Content originally posted in LPCWare by ECamino on Thu May 05 08:00:09 MST 2016
We're trying to use the Y2 crystal for the clock on an LPC824Max board.  Using LPCOpen "LPCXpresso824-MAX board" v2.19 (the last version).

I removed the 0-ohm resistors at SJ3 and SJ4, and solder-jumped SJ3 1&2 and SJ4 1&2.

I have continuity on Y2 to pins 17 and 18 on the LPC824 chip.

Using LPCOpen project for LPC824 "periph_wwdt"

In file "lpc_board_nxp_lpcxpresso_824\board_sysinit.c", line 68, I commented "Chip_SetupIrcClocking();" and added line "Chip_SetupXtalClocking();"

I build debug (using LPCLink on an LPCxpresso 800 board) and I can see it hangs at sysinit_8xx.c, line 78: "while (!Chip_Clock_IsSystemPLLLocked()){}"

I checked the Y2 signal with a scope, and there is no crystal signal from either Y2 pad.

What do I have to do to enable the crystal clock on an LPC824 Max board?

Thanks,

EC

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