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| gio | Hello, I'm playing a little bit with the fomu-workshop. The usb-cdcacm is supposed to be modified to implement some interactive thing via USB, but I don't understand where in the code the USB data is processed. | 15:34 |
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| gio | In particular, the README says that it returns every character it receives augmented by 1, and it works on my fomu. But I don't understand where this logic is implemented. | 15:35 |
| xobs | gio: it's not really logic so much as it is just an interrupt handler: https://github.com/im-tomu/fomu-workshop/blob/master/riscv-usb-cdcacm/src/usb-epfifo.c#L240 | 16:26 |
| tpb | Title: fomu-workshop/usb-epfifo.c at master · im-tomu/fomu-workshop · GitHub (at github.com) | 16:26 |
| gio | xobs: Nice, thanks, now I see it. BTW, is there already some similar USB driver for fomu that gives me a kind of serial port between the PC and the fomu without me having to care too much about USB details? | 16:33 |
| CarlFK | gio: I have seen a serial port connection to micropython on fomu, - is that close to what you are asking? | 16:41 |
| CarlFK | gio: hmm, is "driver" pc os side, or fomu side of the usb connection? | 16:42 |
| gio | CarlFK: I mean on the fomu side. You're right, I will investigate the micropython firmware and try to remove the micropython part. What remains should be what I want. | 16:47 |
| CarlFK | gio: yay, I helped :p. more that may help: I wold look at the micropython c code for stdout things (printf?) and follow where those bytes go | 16:48 |
| CarlFK | eventually they go over usb, so somewhere along that path is what you want | 16:49 |
| gio | Now the problem becomes finding a micropython version that I can build from sources and make work. | 17:04 |
| gio | If I upload the micropython binary that is in the fomu-workshop repository, it work. If I try to build it from the micropython repository, it builds, but it does not work. | 17:04 |
| gio | (kernel complains USB is misbehaving) | 17:04 |
| xobs | https://github.com/xobs/micropython/tree/fomu/ports/fomu | 17:06 |
| tpb | Title: micropython/ports/fomu at fomu · xobs/micropython · GitHub (at github.com) | 17:06 |
| xobs | Oh. Might be missing SET_ADDRESS functionality? | 17:06 |
| gio | xobs: I tried that repository, both "fomu" and "2019-something-fomu" branches, but same result. | 17:07 |
| gio | How do I know about SET_ADDRESS? | 17:07 |
| gio | BTW, compiling the cdcacm example works, same toolchain and same fomu. | 17:08 |
| xobs | This is the SET_ADDRESS patch: https://github.com/xobs/micropython/commit/573979203d20b42e468f95f4b6f1d9a63bb88d72#diff-597ddbd985b04dd62936e01274de3eae | 17:11 |
| tpb | Title: fomu: support foboot 1.9+ · xobs/micropython@5739792 · GitHub (at github.com) | 17:11 |
| gio | xobs: Wonderful, it works now! Thanks! :-) | 17:17 |
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