cpldcpu / u-wire Goto Github PK

Hi,

I wonder if it would be possible to modify this to send data back to the computer instead of the other way around.
I can see such a thing being very useful - maybe a tiny data logger, or to connect a one-wire temp sensor. Could even get it to enumerate under the HID class as a keyboard and have it send keystrokes.

I have quite a bit of experience making code as small as possible (and writing in assembler), and with V-USB (modified the HIDSerial repository to fit into an attiny2313 as a USB-USART adapter), so I don't mind doing the coding for such an idea, but I am interested in your opinion as it would depend on how you have modified VUSB - presumably you've removed a large amount of stuff from it.

Is it just by chance that ZL isn't close to 255 when the function is called? It could cause unexpected errors by syncing to the wrong JK transition.
https://github.com/cpldcpu/u-wire/blob/master/firmware/usbdrv/usbdrvasm12.inc#L59

It looks like Armin copied the same code:
ArminJo/micronucleus-firmware#11

I also noticed that other than for the t10, x1/x2 use r16/r17 which are supposed to be callee-saved.

Have you ever tried it on Windows 7 x64? If I connect the usb device, it's shown as an unknown device. Not because of the driver - it's not recognized at all. VID and PID are 0000. On Windows XP 32 bit there are no problems, OSX is also happy