1. Home
  2. Embedded Programming
  3. ARM FAST GPIO PROBLEM

ARM FAST GPIO PROBLEM

hi i m working on ARM micro LPC2138 but m unable to initialise or to make work its fast GPIO.i hav configured the settings for fast GPIO in SCS register but still its not working. i m trying this with simple example to toggle LEDs connected to port pins.however i can do the same wid legacy GPIO registers i want to use the additional features wid fast GPIO. is there any other setting for that ? plz do help

Reply to
abhay
Loading thread data ...

So where in the LPC21"38" manual did you read that it had fast I/O?

*Peter*

Reply to
Peter Jakacki

Hi Even i have never heard about the fast GPIO in LPC2138.

Yes but you can certainly make the processor speed faster upto 60 MHz using its PLL Connect Block.

Just small settings for that to make it working on 60MHz.

Regards, Anish snipped-for-privacy@gmail.com

Peter Jakacki wrote:

Reply to
### AndY ###

hi, thanx for ur reply i m getting confused . i hav read user manual for LPC2138 where it is written on page 78 that fast GPIO are available for LPC213x family.

also i dont need fast GPIO that much for speed but i want to use its byte addressable & masking features for my applications.

so wat i should do. plz suggest

Reply to
abhay

There is nothing in the current LPC2138 manual regarding fast I/O, and there is certainly nothing on page 78 of the LPC2138 user manual that is on NXP's site. You are confused, and must be thinking of the LPC2148.

I would suggest that if you must use the LPC213x series that you find another way to handle your masking, which could be done in software.

Mike

Reply to
Mike Anton

. thanks your

. I'm . I have

. Also I don't I

. and

. what I please

I don't know how much of the above is due to language difficulties, which are forgiveable, and how much is due to laziness and failure to proofread, which are not. But if you are not told of the faults you will not be able to correct them. Correction makes your article much easier to read, and encourages others to respond.

Because some of the problems are probably a language barrier, I have ignored faulty word order, which often seriously affects the English meanings.

The apostrophe signifies a missing letter. Thus "I'm" is a substitute for "I am". "don't" is a substitute for "do not". These arise out of the normal pronunciation of the phrases. The first person pronoun is I (capitalized). The first word of sentences is always capitalized, unless referring to something like a lower case C identifier. Sentences are usually terminated with a period and two spaces. Awkward abbreviations do nothing but annoy the reader.

You should also always include adequate quotations so that your article stands by itself. Google is not usenet, it is only a flawed interface to the system. See the links below.

I hope you take this as helpful criticism. Better communications assist us all.

--
 Some informative links:
   news:news.announce.newusers
   http://www.geocities.com/nnqweb/
   http://www.catb.org/~esr/faqs/smart-questions.html
   http://www.caliburn.nl/topposting.html
   http://www.netmeister.org/news/learn2quote.html
Reply to
CBFalconer

Peter Jakacki escreveu:

The latest LPC2138/01 do have fast GPIO. See the latest datasheet at

formatting link 

--
Francisco
Reply to
frantas

formatting link

Philips said that they would eventually upgrade the GPIO on the 2138. If the datasheet has just been updated then do you think that the chip that was produced 3 months ago or sitting on the distributors shelves will be upgraded as well?

The fast GPIO parts are denoted by the /01 suffix. There are more enhancements such as:

2.1 Enhancements brought by LPC213x/01 devices

  • Fast GPIO ports enable port pin toggling up to 3.5 times faster than the original LPC213x. They also allow for a port pin to be read at any time regardless of its function.

  • Dedicated result registers for ADC(s) reduce interrupt overhead.

  • UART0/1 include fractional baud rate generator, auto-bauding capabilities and handshake flow-control fully implemented in hardware.

  • Additional BOD control enables further reduction of power consumption.

Once again it is the same advice, RTM....carefully.

*Peter*
Reply to
Peter Jakacki

Ok, I stand corrected. There is a new series called LPC213x/01 that does have fast I/O.

Make sure you are using one of these /01 parts, or there is no fast I/O. Make sure you are only using the fast I/O registers. You can't mix fast and slow I/O. If fast I/O is enabled, you must use the fast I/O registers, the slow I/O registers will not work.

Mike

Reply to
Mike Anton

Peter Jakacki escreveu:

formatting link

I didn't say that, not even implied.

Yes, you can see it in my post.

As you said ' yes, the setting is called "LPC2148"', I thought maybe you were not aware of the new parts.

Regards,

--
Francisco
Reply to
frantas

formatting link

This was taking into account the OP who may misread your reply and still think that his 2138 should have fast I/O. Tacking a suffix onto a part will not draw attention to the fact that it is a different part you are talking about unless you emphasize that, especially as it is so new.

Only in retrospect.

Truth be known I was not aware that Philips/NXP had released them yet. I notice that my last weekly "Philips Semiconductor News" was received last month. I am sure they would have announced this /01 part in the weekly bulletin but maybe with all the brand name changes this e-feature is still being updated.

Thank-you for bring the /01 to my attention.

*Peter*
Reply to
Peter Jakacki

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.