[sdiy] Logicport

[Tom Wiltshire]

To add to what others have said, I always find debugging comms a right pain in the posterior. This is because it's rarely clear whether the problem lies at the sending end or the receiving end, so you finish up jumping back and forth between two different bits of code. If they're on different *types* of uP, it's even worse. I once had a PIC talking to a dsPIC - this entailed reprogramming the OS in my programmer each time I changed from one to the other.
A tool like this does away with all of this messing about by providing a solid external analysis. If the logic analyzer understands the messages as SPI, then you know the sender is working, and the problem is at the receiver end. If it doesn't, it can show you exactly what's going wrong with your SPI output. Makes life a whole pile simpler. Maybe for my next birthday...

T.

On 30 Mar 2011, at 01:39, Dan Snazelle wrote:

> How does this help with avr/pic design???
> 
> 
> 
> 
> Sent from my iPhone
> 
> On Mar 29, 2011, at 10:12 AM, Ullrich Peter <Peter.Ullrich at kapsch.net> wrote:
> 
>> Hi Colin!
>> 
>>> On the tools theme, I recently invested in one of these logic analysers:
>>> http://www.pctestinstruments.com/
>>> 
>>> What an amazing piece of kit.
>>> I've got it wired up to multiple MIDI and SPI ports, and it captures all the
>>> data in parallel and de-codes it to the byte values being passed.
>>> There's no going back.
>> 
>> Yes, this is a really nice logic anaylzer - we have it here in our company.
>> Especially the serial interface analyzers are very useful.
>> And with 34 channels you can debug quite big systems or memory busses.
>> 
>> If you don't need 34 channels the smaller 8 channel Saleae Logic Analyzer (cost 150$)
>> Is the right choice. The software is more intuitive than the software of the 34 channel
>> Analyzer and also the serial analyzers are here.
>> So for AVR and PIC design this smaller version would be enough in most cases.
>> 
>> For 50$ you can buy a clone of the Saleae that supports two additional clone modes 
>> from HongKong at www.iteadstudio.com .
>> 
>> Ciao
>> Peter
>> 
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