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69 lines
3.4 KiB
Markdown
69 lines
3.4 KiB
Markdown
# Idle State
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Once you have handled all the previously covered requests the device should be enumerated and remain idle awaiting for a new host request. Your logs may look like this:
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``` console
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INFO:usb_4 -- USB: UsbReset @ 318.66455ms
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INFO:usb_4 -- USB reset condition detected
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INFO:usb_4 -- USB: UsbEp0Setup @ 391.418456ms
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INFO:usb_4 -- EP0: GetDescriptor { descriptor: Device, length: 64 }
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INFO:dk::usbd -- EP0IN: start 18B transfer
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INFO:usb_4 -- USB: UsbEp0DataDone @ 391.723632ms
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INFO:usb_4 -- EP0IN: transfer complete
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INFO:dk::usbd -- EP0IN: transfer done
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INFO:usb_4 -- USB: UsbReset @ 442.016601ms
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INFO:usb_4 -- USB reset condition detected
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INFO:usb_4 -- USB: UsbEp0Setup @ 514.709471ms
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INFO:usb_4 -- EP0: SetAddress { address: Some(17) }
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INFO:usb_4 -- USB: UsbEp0Setup @ 531.37207ms
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INFO:usb_4 -- EP0: GetDescriptor { descriptor: Device, length: 18 }
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INFO:dk::usbd -- EP0IN: start 18B transfer
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INFO:usb_4 -- USB: UsbEp0DataDone @ 531.646727ms
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INFO:usb_4 -- EP0IN: transfer complete
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INFO:dk::usbd -- EP0IN: transfer done
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INFO:usb_4 -- USB: UsbEp0Setup @ 531.829832ms
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INFO:usb_4 -- EP0: GetDescriptor { descriptor: DeviceQualifier, length: 10 }
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ERROR:usb_4 -- EP0IN: unexpected request; stalling the endpoint
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INFO:usb_4 -- USB: UsbEp0Setup @ 532.226562ms
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INFO:usb_4 -- EP0: GetDescriptor { descriptor: DeviceQualifier, length: 10 }
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ERROR:usb_4 -- EP0IN: unexpected request; stalling the endpoint
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INFO:usb_4 -- USB: UsbEp0Setup @ 532.592772ms
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INFO:usb_4 -- EP0: GetDescriptor { descriptor: DeviceQualifier, length: 10 }
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ERROR:usb_4 -- EP0IN: unexpected request; stalling the endpoint
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INFO:usb_4 -- USB: UsbEp0Setup @ 533.020018ms
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INFO:usb_4 -- EP0: GetDescriptor { descriptor: Configuration { index: 0 }, length: 9 }
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INFO:dk::usbd -- EP0IN: start 9B transfer
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INFO:usb_4 -- USB: UsbEp0DataDone @ 533.386228ms
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INFO:usb_4 -- EP0IN: transfer complete
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INFO:dk::usbd -- EP0IN: transfer done
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INFO:usb_4 -- USB: UsbEp0Setup @ 533.569335ms
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INFO:usb_4 -- EP0: GetDescriptor { descriptor: Configuration { index: 0 }, length: 18 }
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INFO:dk::usbd -- EP0IN: start 18B transfer
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INFO:usb_4 -- USB: UsbEp0DataDone @ 533.935546ms
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INFO:usb_4 -- EP0IN: transfer complete
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INFO:dk::usbd -- EP0IN: transfer done
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INFO:usb_4 -- USB: UsbEp0Setup @ 534.118651ms
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INFO:usb_4 -- EP0: SetConfiguration { value: Some(42) }
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ERROR:usb_4 -- EP0IN: unexpected request; stalling the endpoint
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```
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Note that these logs are from a Linux host where a `SET_CONFIGURATION` request is sent after the `SET_ADDRESS` request. On other OSes you may not get that request before the bus goes idle. Also note that there are some `GET_DESCRIPTOR DeviceQualifier` requests in this case; you do not need to parse them in the `usb` crate as they'll be rejected (stalled) anyways.
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You can find traces for other OSes in these files (they are in the `advanced` folder):
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- `linux-enumeration.txt` (same logs as the ones shown above)
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- `macos-enumeration.txt`
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- `win-enumeration.txt`
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✅ Double check that the enumeration works by running [`cargo xtask usb-list`](./listing-usb-devices.md) while `usb-4.rs` is running.
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``` console
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Bus 001 Device 013: ID 1366:1015 <- J-Link on the nRF52840 Development Kit
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(..)
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Bus 001 Device 016: ID 2020:0717 <- nRF52840 on the nRF52840 Development Kit
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```
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Both the J-Link and the nRF52840 should appear in the list.
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You can find a working solution up to this point in `src/bin/usb-4-solution.rs`. Note that the solution uses the `usb2` crate to parse SETUP packets and that crate supports parsing all standard requests.
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