How can i implement USB interface for an embedded flight controller to enable serial prints, parameter changes AND reading data from an SD card?

• atmel-software-package-samv7

  1 18 10.0 C

  Discontinued Legacy software package for samv7, same70 and sams70 product families.

  

I highly recommend the book "USB Design by Example", and reading the source to existing drivers. As for the SD card, it's a bit of a mixed bag. The SD card native mode protocol is technically only available under NDA, but it's been leaked and reverse engineered ad nauseum. If you want to take a look at existing solutions, I'd go through the legacy software package for SAM*7 processors, or the source for FreeRTOS. Leveraging either of these will get you there much quicker than trying to write everything from scratch, which is a MUCH bigger task than I think you realize.

• usb-vk-firmware

  1 0 0.0 C

  Firmware for the USB Volume Knob

I have been through the development of a USB HID device recently using Libopencm3 (and I am not quite done!) It's on my GitHub if you are interested.

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• libopencm3

  11 2,934 5.7 C

  Open source ARM Cortex-M microcontroller library

  

TinyUSB or Libopencm3 are probably your best options (although check they support the SAME70).

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