USBD - Universal serial bus device

RE: USBD - Universal serial bus device

Sigurd — Mon, 30 Nov 2020 14:01:08 GMT

[quote user="LNwork"]So I have to populate the RAM with the required information/data and then data are transfered to USB register throug a easyDMA transfer. Rigth?[/quote]

You tell the USB peripheral where in RAM the data is located, with the EPIN.PTR register, then when you start the transfer, the USB peripheral will automatically retrieve the data from RAM location you pointed it to.

[quote user="LNwork"]When I want to do a bulk IN transation,the data that I want to send from nrf52840 to PC where have to be written? In RAM buffer?[/quote]

Yes, RAM buffer.

[quote user="LNwork"]Is there any example of bulk transfer of data from the nRF52840 ADC to PC(host)?[/quote]

No, not for ADC data. But I believe the usbd_msc example uses bulk transfer.

RE: USBD - Universal serial bus device

alexlöddeköpinge — Thu, 26 Nov 2020 11:52:21 GMT

So I have to populate the RAM with the required information/data and then data are transfered to USB register throug a easyDMA transfer. Rigth?

When I want to do a bulk IN transation,the data that I want to send from nrf52840 to PC where have to be written? In RAM buffer?

Is there any example of bulk transfer of data from the nRF52840 ADC to PC(host)?

Thanks

RE: USBD - Universal serial bus device

awneil — Thu, 26 Nov 2020 11:46:52 GMT

[quote userid="96151" url="~/f/nordic-q-a/68818/usbd---universal-serial-bus-device"]What's the EasyDMA?[/quote]

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Feasydma.html

[quote userid="96151" url="~/f/nordic-q-a/68818/usbd---universal-serial-bus-device"] "Populate Data RAM buffer". What does it means?[/quote]

"Populate" = fill it with all the required information/data