Cardputer v1 support

[joakim]

Thanks for bringing Reticulum to the Cardputer! Any chance of making this run on the older models?

To connect a LoRa module to an older Cardputer, one would have use this technique with a $1 microSD sniffer from AliExpress. I may try to build a custom extension board for E22-900M22S, as I mentioned here.

AFAIK, the only relevant differences to the ADV are 1) different KeyboardReader, and 2) different SPI pins. The M5Cardputer library detects the older keyboard automatically, so hopefully all you have to do is specify the SPI pins of the microSD card slot instead of the expansion port. Would be nice to be able to do that in the UI.

Let me know if I can help out somehow with my Cardputer 1.0.

[joakim]

Had a look at the schematics, and CS, IRQ and RST are the only pins that would differ from Cardputer ADV.

Because there aren't enough GPIOs for a dedicated CS for the LoRa module, we'll have to hijack the microSD slot's CS. We'll also be using the Grove port's G1 and G2 for RST and IRQ. That leaves us with no pins to spare, but BUSY shouldn't be needed when we have RST and IRQ, right?

Signal	ADV	v1	Notes
SCK	40	40	Same as ADV
MISO	39	39	Same as ADV
MOSI	14	14	Same as ADV
CS	5	12	microSD's CS
IRQ	4	2	Grove's G2
RST	3	1	Grove's G1
BUSY	6

Unfortunately, by hijacking the microSD slot's CS, we can't use a microSD card anymore. So it is a bit limited compared to the ADV, but I'd be very happy just to get it working. I hope your firmware doesn't require that extra storage?

As for the hardware side of things, I plan to use a perfboard to extend the microSD sniffer with an E22-400M22S breakout board + a Grove port, similar to this video. Could potentially make a custom extension board for E22-x00M22S modules if there's enough interest.

[defidude]

Adding help wanted tag - I likely won't be touching this anytime soon, but encourage anyone to take a stab at it.

[andres-a-git]

I would also love to use the old v1
Tried the version from M5 burner, screen worked but keyboard was weird

But it would be a nice WiFi chat Device

Unfortunately i do nit know where to change pins and make the build

[andres-a-git]

@VolosR is maybe person who may help?

https://github.com/VolosR

If now the RTNode FW is available, then WiFi for Cardputer would be enough