LPC4350 hardware design issues

[lpcware]

Content originally posted in LPCWare by tom.varghese on Fri Apr 06 06:30:49 MST 2012
Hello,

Please let me know if I'm in the wrong place for this. 

We did a prototype of an LPC4350 and have run into several issues.  The first and most embarrassing one being that the 12MHz crystal won't oscillate, tried a bunch of different caps. We tried the same resonator that was used on one of eval boards, still no dice. We finally wired in a 12MHz oscillator and how the chip seems be somewhat alive.  Any thoughts on this?

If there is anyone willing to help us out, please let me know. We need to get this thing going soon, so if there are any professionals in the SE Wisconsin area that are willing and able to work with us for a short while, we might be interested.

--Tom V.

[lpcware]

Content originally posted in LPCWare by Dilberto on Thu Apr 12 21:35:17 MST 2012
Hi.
I'm not familiar with the LPC43xx family, but I had a similar issue with LPC11xx.
The xtal osc can be "bypassed" by setting bit 1 of XTAL_OSC_CONTROL register. This is not the default but may have been done accidentally. Did you check this ?

[lpcware]

Content originally posted in LPCWare by researchinnovation on Thu Apr 12 02:49:32 MST 2012
[SIZE=4][B][COLOR=Blue]Hi...!!!
I want to take/read file(.txt format doc format) continuously as an input for one of my application on I2C.
But when I use FILE *file and file =fopen("filename.txt","r"); it is    showing error and I tried few more things but it is showing error.
I have used #include "debug_printf.h" , #include "stdlib.h" and other required driver files, but still error is coming.

Please guide me on this or share any document available on c functions for LPCxpresso.

Thanks....:)[/COLOR][/B][/SIZE]

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Mon Apr 09 07:44:27 MST 2012

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Quote: tom.varghese
Any thoughts on this?

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Since I'm not familiar with LPC4350 just a few general thoughts:

ISP is working without external crystal and can help you to detect hardware problems :)

So did you switch to ISP and try to synchronize already?

Unfortunately FlashMagic doesn't support LPC4350, but sending a simple '?' via terminal program should return a 'Synchronized' :eek:

[lpcware]

Content originally posted in LPCWare by tom.varghese on Mon Apr 09 06:18:18 MST 2012
Yup, that is what we started from.  Which is why we are quite concerned that there is either something wrong with our design or something wrong with the chips we got.

--Tom V.

[lpcware]

Content originally posted in LPCWare by kendwyer on Fri Apr 06 15:19:04 MST 2012
Hi Tom,
You can also refer to the Hitex schematics posted on that site.
http://www.lpcware.com/content/nxpfile/lpc1800-lpc4300-hitex-board-schematic-reva4

[lpcware]

Content originally posted in LPCWare by tom.varghese on Fri Apr 06 08:34:19 MST 2012
Thanks! I'll do that.

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Fri Apr 06 06:45:26 MST 2012

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Quote: tom.varghese
Please let me know if I'm in the wrong place for this.

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Perhaps asking here could help:

http://www.lpcware.com/forums/microprocessors-forums/lpc43xx