woop! SDM3055 support is now here!

there are loads of quality improvements though

• docs
• proper compiler error flags
• unit testing

docs are simple and are being worked on, when reasonable docs will move over to being an ongoing process

compiler error flags should have been done when the Makefiles were written and there is a big chance that enabling the normal -Wall -Werror -Wextra flags will cause some nontrivial rework

unit testing will be new, ive only done a little bit of CPP unit testing and that was in TESSY which is out of my price range

ive decided. the SDM3055 will first gain a SDM3055 driver which does not use the scancard. this will implement a new DMM interface

when the SDM3055-SC driver with scancard support is written it will implement a new scanningDMM interface

there is now also some minimal support for gitea actions

the PCB layout is now generally complete. it just needs some silkscreen fanciness and a final look over to verify that the tracking is sound.

i may put some form of protection on the ethernet lamps, they dont have any right now

i put the design into aisler to get a RoM cost on the PCB and it is expensive at about £50 per PCB and MOQ of 3 which gives a total PCB cost of £100 per switchBox. this means it needs to be as close to perfect as possible as its very much a oneshot as theres probably about the same in components on the PCBA still, it should be fine...right?

after too many hours of searching for 5mm requirement clearenced ethernet connectors with no success i give up. this design will have to have the PCB butting againt the chassis panel. the USB connector will be reworked to provide the same amount of edge overhang as the ethernet connector

the contact connectors were revisited and actually the chosen part was fine, the model was incorrect but the chosen part was fine and its BoM information is now populated

the PCB is almost done just needing:-

• ethernet
• silkscreen tidying
• routing final look
• DRC
• any additional silkscreen

then it will be on to software! its been a long time coming

relayout in progress.

there are several component changes to make, they are:-

• longer ethernet connector - there is a 5mm pcb overhang requirement to allow connector access through the chassis wall
• contact connectors - when originally specified, there was insuffiucient bill of materials data and they are fairly tall

i will also need some series resistors as the traces are a bit long...