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STM32 USB OTGFSDEV: Update comments

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Petteri Aimonen 2021-03-24 14:57:42 +02:00 committed by David Sidrane
parent 18bfef1b38
commit 3dfc4e0afd
1 changed files with 9 additions and 3 deletions
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12
arch/arm/src/stm32/stm32_otgfsdev.c
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@ -481,15 +481,21 @@ struct stm32_usbdev_s
* ep0data
* For OUT SETUP requests, the SETUP data phase must also complete before
* the SETUP command can be processed. The pack receipt logic will save
* the accompanying EP0 IN data in ep0data[] before the SETUP command is
* processed.
* the accompanying EP0 OUT data in ep0data[] before the SETUP command is
* processed. The data length is specified in the SETUP packet payload,
* and can consist of multiple DATA packets.
*
* For IN SETUP requests, the DATA phase will occur AFTER the SETUP
* control request is processed. In that case, ep0data[] may be used as
* the response buffer.
*
* ep0datlen
* Length of OUT DATA received in ep0data[] (Not used with OUT data)
* Length of data received part of OUT SETUP request. During transfer
* it is the total number of bytes received, which can be more than
* CONFIG_USBDEV_SETUP_MAXDATASIZE. The value is clamped to valid length
* of data in ep0data[] before SETUP OUT handler is called. Bytes that
* exceed the maximum length are discarded, but must be read out of the
* USB peripheral FIFO.
*/
struct usb_ctrlreq_s ctrlreq;