Products > Test Equipment
open source GPIB adapter
Venturi962:
The ATmega32U4RC will work fine, that's what I'm using in the ones I built up.
I did have to slow down the bitclock when flashing the bootloader (note the -B 10 at the end) YMMV:
avrdude -c usbasp -p m32u4 -e -Ulock:w:0x3F:m -Uefuse:w:0xcb:m -Uhfuse:w:0xd8:m -Ulfuse:w:0xff:m avrdude -c usbasp -p m32u4 -U flash:w:BootLoader.hex -B 10
artag:
--- Quote from: dorkshoei on November 30, 2021, 02:49:20 am ---
ATMEGA32U4 seems pretty solidly discontinued. Octopart shows 0 in stock at authorized distributors.
--- End quote ---
Still plenty in the channel in the form of pro micro arduinos. I've only glanced at xyphro's code, but I think it could be fairly easily modified to work with the pcb I did for the AR488. Probably with a slight loss of speed, as the pinouts are likely to be less optimised for the code.
Of course, that wouldn't give the layout and usb connector you prefer. The best solution to that is probably to 3d-print a case that gives extra support to the micro-usb connector - I think there's one already in the AR488 thread.
As for ethernet versions : yes, that would be great (although USB is quite convenient in providing power). One way to do it would be via an ethernet-equipped pi or Beaglebone linked to a bunch of USB adapters. Direct connection to ethernet would be faster, but most instruments are fairly slow. Also, all the single board computers with ethernet that I know of (beaglebone, arduino, raspberry pi and teensy 4.1) have 3.3V I/O so you'd need to use the proper buffers. This might seem no great disadvantage or even an improvement but a single bus also means you can't run data transfers in parallel as you can with multiple USB ports.
dorkshoei:
--- Quote from: artag on November 30, 2021, 09:13:04 pm ---Still plenty in the channel in the form of pro micro arduinos.
--- End quote ---
Indeed. It makes me wonder whether the Chinese "new" stock available for direct purchase is then actually authentic, vs used/remark. The fact that utsource (who are one of the few honest sellers) has marked all their stock as "used" makes me suspicious of the rest.
artag:
Quite possibly. However, I've bought chinese ARduino micros recently and they've all worked OK. So even if they're clones or pulls, they do seem to be functional at least IME.
dorkshoei:
I ordered from utsource, they listed two used lots, each several thousand. Of course it turns out they had zero.
I guess I'm waiting till they come back into stock. I'm in no rush so that's fine. Spent the last couple of days 3D printing some enclosures for them ;-)
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