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change assignment: more concise, less like a trap

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Mirabellensaft 2021-04-20 14:38:38 +02:00
parent 80c890b785
commit 86f1fefcc2
2 changed files with 14 additions and 14 deletions
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6
advanced/firmware/src/bin/usb-1.rs
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@ -43,10 +43,8 @@ fn on_event(_usbd: &USBD, event: Event) {
Event::UsbReset => todo!(),
Event::UsbEp0DataDone => todo!(),
// leave this at it is for now.
Event::UsbEp0Setup => {
log::info!("goal reached; move to the next section");
dk::exit()
}
Event::UsbEp0Setup => todo!(),
}
}

22
embedded-workshop-book/src/usb-events.md
View file

@ -10,22 +10,24 @@ In this starter code the USBD peripheral is initialized in `init` and a task, na
❗️ Keep the cable connected to the J3 port for the rest of the workshop
Go to `fn on_event`, line 39. In this section you'll need to implement the following USB events until you reach the EP0SETUP event:
This code will panic because `USBRESET` is not implemented yet.
- `USBRESET`. This event indicates that the host issued a USB reset signal. According to the USB specification this will move the device from any state to the `Default` state. Since we are currently not dealing with any other state, you can handle this state by doing nothing.
- `EP0DATADONE`. The USBD peripheral is signaling the end of the DATA stage of a control transfer. You won't encounter this event just yet.
- `EP0SETUP`. The USBD peripheral has detected the SETUP stage of a control transfer. If you get to this point move to the next section.
When you are done you should see this output:
✅ Go to `fn on_event`, line 39. In this section you'll need to implement the following USB events `USBRESET` and `EP0SETUP` so that your log output will look like this:
``` console
(..)
INFO:usb_1 -- USB: UsbReset
INFO:usb_1 -- returning to the Default state
INFO:usb_1 -- USB: UsbEp0Setup
INFO:usb_1 -- goal reached; move to the next section
INFO:dk -- `dk::exit() called; exiting ...
```
Do not overthink this exercise; it is not a trick question. There is very little to do and no new functionality to add.
## Help
- `USBRESET`. This event indicates that the host issued a USB reset signal. According to the USB specification this will move the device from any state to the `Default` state. Since we are currently not dealing with any other state, you can handle this state by adding a log statement to provide information that this event occurred.
- `EP0DATADONE`. The USBD peripheral is signaling the end of the DATA stage of a control transfer. Since you won't encounter this event just yet, you can leave it as it is.
- `EP0SETUP`. The USBD peripheral has detected the SETUP stage of a control transfer. Add a log statement containing "goal reached; move to the next section" and exit the application.
You can find the solution in the `usb-1-solution.rs` file.