• USB Dongle

    helge11/29/2016 at 22:41 0 comments

    I'd have opted for a flex cable taking the place of the micro USB header but with a healthy disregard of RF requirements it appears to be "ok" to just solder on some crusty ribbon cable strips

    the idea is out there...

  • Beside the point...

    helge09/19/2016 at 19:02 0 comments

    ... I just saw that windows has a generic USB driver class for displays..

    "Microsoft provides USB video class support by means of the Usbvideo.sys driver. {6bdd1fc6-810f-11d0-bec7-08002be2092f}"

    It seems however that this is only for webcams? USB 2.0 displays suffer form the curse of proprietary DisplyLink being the only game in town https://www.tomshardware.com/reviews/usb-graphics-adapter,3006-1.html and https://github.com/DisplayLink/evdi)

    ... makes me wonder whether USB 3.x and Windows 10 brought about any change at all?

  • wifi breakout boards

    helge09/19/2016 at 13:52 0 comments

    Boards have arrived! Now where are those ESP modules when you need them!

  • wondering about SDIO

    helge09/14/2016 at 16:03 0 comments


    >> The BCM283x SoCs at the heart of every Pi has two MMC controllers. One of these connects to the SD card slot that the Pi boots and runs its OS from. The other has largely been ignored, but comes out on the HAT connector as alternate functions on GPIOs 22-27. Recent kernel and boot blob changes have enabled these pins to be mapped to the MMC controller that also supports SDIO devices.


    >> SDIO is the SD host/eMMC interface on the Raspberry Pi. SD host signals are normally used for the microSD slot.These pins are "SD host" on Alt0 and "eMMC" on Alt3.


    >> The SD cards are primaraly a SPI device, as such you technically could parallel anouther device as long as you use a seperate chip select line ut this would then require special driver to know what to use for it.


    Sometimes it is the hardest to find definitive statements about obvious things. ajlitt has done an excellent job documenting all there is to know about the MMC controller and the secondary SDIO interface. The facts have changed over the past time so I initially found some contradictions.

    Looking forward to Jacksons PCBs and ESP 12F modules from abroad.