Re: USB controller driver usb_dc_ep_write
Carles Cufi
+ Johann, Andrei, Pawel
From: devel@...
<devel@...> On Behalf Of Mark Wang
Sent: 10 December 2018 13:37 To: devel@... Subject: [Zephyr-devel] USB controller driver usb_dc_ep_write
Hi all, I see many USB controller drivers implement usb_dc_ep_write function with one copy, copy the data (passed to usb_dc_ep_write) to one self’s buffer then do the transfer. Do I need do this when implementing one new USB controller driver? Does the Zephyr USB stack limit the data (pass to usb_dc_ep_write) is in RAM? The function prototype is as follow: int usb_dc_ep_write(const u8_t ep, const u8_t *const data, const u32_t data_len, u32_t *const ret_bytes)
Mark Wang Thanks
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