[OpenTRV-interest] Firmware Loading - Walrus ?

[Mark Hill]

The Walrus board - Eagle and Gerbers: https://github.com/opentrv/Ope
nTRV-Arduino-V0p2/tree/master/Arduino/hardware/walrus

Has a microusb and a CH340G to eliminate the need for an FTDI cable for
programming. It doesn't contain an ISP for programming the bootloader, but
does accept the 6 pin connector from e.g. a USBtiny and allows a switch
between one and the other, controlled by a GPIO line. We built it for use
in our testing and programming rigs.

I'd recommend a cheap and cheerful USBTiny type device, I've had luck with
http://www.ebay.co.uk/itm/191780957944 and
http://www.ebay.co.uk/itm/USBtinyISP-V4-AVR-ISP-Programmer-with-Reliable-Plastic-Enclosure-/330824700564

If you don't have a Walrus, there's some fiddling to do with pinouts and
cables to fit to an I2CEXT 14 pin connector as you can't just plug in a 6
pin ISP or serial FTDI connection, the pins are in the wrong places for
that.

For the I2CEXT 20 pin connector, it accepts 6 pin ISP and FTDI connections
without any further effort. Some of the pins are duplicated for that to
happen.

Regards, Mark


On 6 January 2017 at 12:23, Mark Hanford <mark at hanfordonline.co.uk> wrote:

> The Walrus has a MicroUSB on the back, so you can upload new firmware
> without needing an ISP. As far as I am aware, you still need an ISP for the
> bootloader though. (I'll let Mark or Deniz correct me on that one)
>
> Mark (too many Mark's - everyone online calls me Cyl, so that'll do here
> too)
>
> On 6 January 2017 at 12:11, Simon Hobson <linux at thehobsons.co.uk> wrote:
>
>> Jason Pearce <jason at pearce.org.uk> wrote:
>>
>> > Reading the wiki, it suggests firmware/bootloaders can be programmed
>> using a walrus
>> > https://github.com/opentrv/OTWiki/wiki/REV11-Firmware-Loading-Walrus
>> >
>> > I have purchased a "USBtinyISP V4 AVR ISP Programmer" - apart from
>> simplicity of programming the various boards, does the walrus provide any
>> other functionality that the avr doesn't ?
>>
>> I'm glad you asked that, because it prompts me to ask something I wasn't
>> sure about.
>>
>> Looking at the photos in that Wiki, it looks like there's a 6 pin ribbon
>> cable & connector like that on the AVR programmer - so I'm assuming there's
>> "something else" not mentioned to connect between USB (can't see anything
>> USB on the Walrus board) and the board.
>>
>> So do we need some sort of USB-<something> adapter as well as the Walrus
>> board ?
>>
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