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update text in advanced/README.md

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Lotte Steenbrink 2020-07-03 16:53:54 +02:00
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advanced/README.md
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@ -256,10 +256,12 @@ So that's what we'll do here. In the `advanced/common/usb` folder you'll find st
To sum up the work to do here: To sum up the work to do here:
1. write a SETUP data parser in `advanced/common/usb`. You only need to handle the GET_DESCRIPTOR request and make the `get_descriptor_device` test pass for now. 1. write a SETUP data parser in `advanced/common/usb`. You only need to handle the GET_DESCRIPTOR request and make the `get_descriptor_device` test pass for now. Note that the parser already handles SET_ADDRESS requests.
2. modify `usb-1` to read (USBD registers) and parse the SETUP data when the EPSETUP event is received. 2. modify `usb-1` to read (USBD registers) and parse the SETUP data when the EPSETUP event is received.
> Note: If you're using a Mac, you need to catch `SetAddress` requests returned by the parser as these are sent before the first GetDescriptor request. You can handle them by doing nothing.
3. when you have successfully received a GET_DESCRIPTOR request for a Device descriptor you are done and can move to the next section. 3. when you have successfully received a GET_DESCRIPTOR request for a Device descriptor you are done and can move to the next section.
Alternatively, you can start from `usb-2` instead of `usb-1`. In either case, the tasks are the same. Alternatively, you can start from `usb-2` instead of `usb-1`. In either case, the tasks are the same.
@ -269,6 +271,7 @@ If you are logging like the `usb-2` starter code does then you should see an out
``` console ``` console
INFO:usb_2 -- USB: UsbReset @ 438.842772ms INFO:usb_2 -- USB: UsbReset @ 438.842772ms
INFO:usb_2 -- USB: UsbEp0Setup @ 514.984128ms INFO:usb_2 -- USB: UsbEp0Setup @ 514.984128ms
...
INFO:usb_2 -- SETUP: bmrequesttype: 128, brequest: 6, wlength: 64, windex: 0, wvalue: 256 INFO:usb_2 -- SETUP: bmrequesttype: 128, brequest: 6, wlength: 64, windex: 0, wvalue: 256
INFO:usb_2 -- GET_DESCRIPTOR Device [length=64] INFO:usb_2 -- GET_DESCRIPTOR Device [length=64]
INFO:usb_2 -- Goal reached; move to the next section INFO:usb_2 -- Goal reached; move to the next section