Article: NuttX RTOS for PinePhone: USB with Enhanced Host Controller Interface
Weeks ago we talked about porting Apache NuttX RTOS (Real-Time Operating System) to PinePhone, and how we might turn it into a Feature Phone.

But to make phone calls and send text messages, we need to control the LTE Modem over USB. Thus today we’ll build a USB Driver for NuttX on PinePhone…

1. What’s USB Enhanced Host Controller Interface (EHCI)

2. Why it’s simpler than USB On-The-Go (OTG)

3. How we ported the USB EHCI Driver from NuttX to PinePhone

4. Handling USB Clocks and USB Resets on PinePhone (with tips from U-Boot Bootloader)

5. And the NuttX EHCI Driver boots OK on PinePhone!

NuttX RTOS for PinePhone: Simpler USB with EHCI (Enhanced Host Controller Interface)
Thanks so much for all your hard work on this, and really enjoying all your posts.

Really hoping you'll be the first person to get the modem working 100%. Could be a game changer!
Thank you so much for reading :-)

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