Path: ...!weretis.net!feeder6.news.weretis.net!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!feeder.usenetexpress.com!tr2.iad1.usenetexpress.com!69.80.99.22.MISMATCH!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Sat, 09 Mar 2024 17:24:48 +0000 From: John Larkin Newsgroups: sci.electronics.design Subject: Re: using a pi 400 to debug a pico Date: Sat, 09 Mar 2024 09:23:24 -0800 Organization: Highland Tech Reply-To: xx@yy.com Message-ID: <3f6pui5nd5fp5j0bpcjfi0r2jfcr1hgrak@4ax.com> References: <7s6bqi94igeihtglep2rhavbl98lhpv7k3@4ax.com> <36kdqilnf6uih8ckcj6rn6busb3sio23a0@4ax.com> <20rgqilmf64j0r1psk7o6u7n26t00pf59q@4ax.com> X-Newsreader: Forte Agent 3.1/32.783 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 45 X-Trace: sv3-mK4FzN/iAQhcIt7G9vb26T0Tywl5+OYTyAnpw4DFem5IXBZVLH5AmJvBU9H5AiKZ0imczVWVd7joKUt!w2OyUd0G6aDfr9CRRJaBYdbzwcm+5aGa716xm7GUFAURFek+ICib8gcOK9ansv1rFXRID4nnHklm!xznt+Q== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 3430 On Sat, 9 Mar 2024 01:26:48 -0000 (UTC), Jasen Betts wrote: >On 2024-01-18, john larkin wrote: >> On Wed, 17 Jan 2024 12:16:29 -0800 (PST), whit3rd >> wrote: >> >>>On Tuesday, January 16, 2024 at 11:02:40?AM UTC-8, john larkin wrote: >>> >>>> This is a first pass at the dev board. >>>> >>>> https://www.dropbox.com/scl/fi/709v4pqjhe91jnwqh4wvg/Z566_Sch_2.jpg?rlkey=fjq3a9re53cv5l0zn9ya00akk&raw=1 >>>> >>>> It would be used in development and production test. Every >>>> RP2040-based board would have the small-pitch 20 pin ribbon cable >>>> header. >>> >>>Why bother with pins, and ribbon connector insertion force? Just print >>>test point pads, a few alignment holes, and make a plug of >>>spring pins. It's not like you need this access while the unit is >>>bolted into its box and racked into a larger system. >>> >>>Do it with two different diameter alignment pins, so it doesn't get >>>reversed. A captive nut to retain it would be useful, too. >> >> Too much work! We can buy the ribbon cables and connectors from >> stock. > >True, you'd have to order from digikey and wait a day to get such a >connector (tag connect) > >we use the Tag Connect TC2030IDC connector intended for PIC programming to >program our ESP32 boards one end plugs right into the ESP-prog, no >modification is needed. > >The price seems to have dropped recently, perhaps a patent has >expired, also I'm seeing Chinese clones now. A 20 pin half-pitch ribbon cable would take, if anything, less board area, and be less wobbly. And has 20 connections! I could use a 16 pin ribbon connector, but I have plans for all 20. I want to do more than just JTAG a CPU.