HP41C with Rp Pico attached

[blackjetrock]

(06-22-2023 01:10 PM)ThomasF Wrote:  Hi Andrew,

I used your code as a base, but added another OLED driver.
I also implemented my own font (14-segment lookalike with original charset).

I'm interested in your 14 segment font. Is your code online somewhere?

Quote:I thought I could use a single bi-directional levelshifter for ISA, but maybe changing the direction of the gpio on the fly makes things hickup.

I used a level shifter like that and it seems fine. I used a 74LVC245.

Quote:The Tiny2040 doesn't have that many gpios, but it is small and easy to use.

I use the SDK, compile, pressing boot+reset and copy the file from the PC to the RPI, so turnaround time is very short when developing (and I don't need a second Pico for flashing).

Cheers,
Thomas

Yes, I recently used an RP2040 Zero which is very similar. There's an SDK call you can make that puts the RP2040 into mass storage mode. So you can use the USB CLI instead of pressing the buttons.

Andrew