[sdiy] Why did this 100pF capacitor fix the SPI bus?

Tom Wiltshire tom at electricdruid.net
Mon Feb 22 11:01:41 CET 2021


Now you’ve seen it, you’ll recognise it, but if you’re like me, you’ll still get it wrong first!

Still, it’s an easy fix once you know.

Tom

==================
       Electric Druid
Synth & Stompbox DIY
==================


> On 22 Feb 2021, at 05:59, Spiros Makris <spirosmakris92 at gmail.com> wrote:
> 
> Turns out you all were right. I had him remove the capacitor and try out the other 3 SPI modes, eventually, he found the one that worked.
> Amazing how a breadboard can skew your results, isn't it?
> 
> On Tue, 16 Feb 2021 at 18:12, Tom Wiltshire <tom at electricdruid.net <mailto:tom at electricdruid.net>> wrote:
> 
> 
> 
>> On 16 Feb 2021, at 16:06, Richie Burnett <rburnett at richieburnett.co.uk <mailto:rburnett at richieburnett.co.uk>> wrote:
>> 
>> There are 4 different SPI modes, (0,0) (0,1) (1,0) (1,1).  Make sure both ends of the link are set up for the same mode.
> 
> 
> I think I *always* get this wrong before I get it right!
> 
> Tom
> 
> ==================
>        Electric Druid
> Synth & Stompbox DIY
> ==================
> 

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