LPC MicrocontrollersのトピックRe: XTAL problem

XTAL problem

lpcware — Wed, 15 Jun 2016 17:35:29 GMT

Content originally posted in LPCWare by GPh on Fri Nov 27 05:14:22 MST 2015
Hi,

I have a new LPC1758 board who don't work correctly with XTAL.
When i use internal oscillator is OK.
When i use XTAL is not OK. Debug probe don't connect each time, serial is not at the good speed, ...

When i use the same software on a LPC1768 board it's OK. (The design is the same on XTAL part)
I try many capacitor on xtal, same.
The XTAL is 16MHz same as on the other board ...

I don't know where is the problem and i don't know what i can look for resolve this.

If someone have some suggest ?

Thanks, Philippe.

Re: XTAL problem

lpcware — Wed, 15 Jun 2016 17:35:30 GMT

Content originally posted in LPCWare by R2D2 on Fri Nov 27 07:13:15 MST 2015

Quote: GPh
If someone have some suggest ?

Debug your software and find out what's happening in detail...

Is your crystal setup for a 16MHz crystal?

Then check your hardware: look in the schematic and scope the crystal...

Re: XTAL problem

lpcware — Wed, 15 Jun 2016 17:35:30 GMT

Content originally posted in LPCWare by GPh on Fri Nov 27 07:40:25 MST 2015

The crystal frequency is good in software.
The crystal is running at really at 16MHz.
The hardware is OK.

I've done this checks and i find nothing wrong. It's why i'm searching help. :)

I also check errata sheet.

Re: XTAL problem

lpcware — Wed, 15 Jun 2016 17:35:31 GMT

Content originally posted in LPCWare by R2D2 on Fri Nov 27 08:09:45 MST 2015

Quote: GPh
The crystal frequency is good in software.
The crystal is running at really at 16MHz.
The hardware is OK.

I've done this checks and i find nothing wrong. It's why i'm searching help. :)

I also check errata sheet.

:D

After telling us that your hardware is correct and your software is correct which kind of help are you searching :~

Spiritual help?

Re: XTAL problem

lpcware — Wed, 15 Jun 2016 17:35:32 GMT

Content originally posted in LPCWare by GPh on Mon Nov 30 02:29:04 MST 2015

Quote: R2D2

After telling us that your hardware is correct and your software is correct which kind of help are you searching :~
Spiritual help?

Perhaps ... 0:)

I explain on my first post what i do.

The only change in my tests is the processor.
I only have one LPC1758 board, my other tests have been made with LPC1768.
Same desgin on the XTAL part, same regulator, same xtal.

LPC1758 & LPC1768 have the same core, only the number of pins change.
If the software work on 1768 i think it is good for the lpc1758. perhaps it's wrong ...
Can someone confirm ?

Thanks

Re: XTAL problem

lpcware — Wed, 15 Jun 2016 17:35:32 GMT

Content originally posted in LPCWare by on Mon Nov 30 02:37:42 MST 2015
Is the problem that everything is correct? So far I see nothing that may cause any troubles.
You may search some help at omniglot.com/language/articles/englishistricky.htm if needed.