how to get data from pc by usb ep0

RE: how to get data from pc by usb ep0

Sigurd — Mon, 04 Nov 2019 07:56:57 GMT

Hi,

Sorry for the late reply.

Endpoint 0 is used for control transfers only and can not be assigned to any other function.

The USB specification mandates every USB device to implement endpoint 0 IN and OUT as control endpoints.

See e.g. this and this link.

RE: how to get data from pc by usb ep0

lyi — Wed, 11 Sep 2019 01:25:44 GMT

Sorry, I have been a little busy recently, so I didn't reply in time，Our requirement is to use ep0 port to transfer data，Could you please help me to try whether ep0 can accept the data of PC terminal? I really can't find any problem，thanks。

RE: how to get data from pc by usb ep0

Sigurd — Thu, 29 Aug 2019 12:05:17 GMT

Hi,

I believe you need to configure NRF_DRV_USBD_EPOUT1 for the data-transfer from pc to the nRF52840.

If you are interested in using a predefined USB class, then perhaps the CDC ACM USB class is more suitable for your application. Take look at the usbd_cdc_acm example.

(If you are creating your own custom USB class, then let me know, and I could create a simple example for that.)

RE: how to get data from pc by usb ep0

lyi — Tue, 27 Aug 2019 09:20:03 GMT

hi thank for you answer.

i want to get 32 byte of data from the pc, It is then transmitted to other devices through spi.

how to use the NRF_DRV_USBD_EVT_EPTRANSFER ?

I can use nrf_drv_usbd_ep_transfer(NRF_DRV_USBD_EPIN0, &transfer) to send data to PC,It can also trigger the

usbd_event_handler function into the NRF_DRV_USBD_EVT_EPTRANSFER branch.

but i can't use the nrf_drv_usbd_ep_transfer(NRF_DRV_USBD_EPOUT0, &transfer) to get data from pc ,It does not

trigger usbd_event_handler.

I don't understand the difference between them,Why can I send data to pc but not receive?

RE: how to get data from pc by usb ep0

Sigurd — Mon, 26 Aug 2019 16:46:30 GMT

Hi,

Could you explain what you are trying to send in the setup stage?

What type of data are you trying to send from the pc ? What are you trying to achieve?

If you are trying to do a data transfer, then you should use the NRF_DRV_USBD_EVT_EPTRANSFER event instead. See this and this link.