On 17/04/2018 08:17, Jan Panteltje wrote:
> On a sunny day (Mon, 16 Apr 2018 21:14:42 +0100) it happened Gareth's
> Downstairs Computer
>    wrote in
> :
>
>> On 16/04/2018 20:38, Jan Panteltje wrote:
>>> On a sunny day (Mon, 16 Apr 2018 19:40:17 +0100) it happened Gareth's
>>> Downstairs Computer
>>>     wrote in
>>> :
>>>
>>>> I wonder if anyone has implemented a blinkenlights
>>>> interface for the RPi, so that one is not reliant on the
>>>> complexity and reliability of VDU monitors, mice and
>>>> keyboards?
>>>
>>> What do you nean by 'blinkenlights'?
>>> You can hang anything you like on GPIO (with proper hardware driver).
>>>
>>
>> Was brought up on PDP11 and PDP8 and miss the ability, on the few
>> occasions when necessary, to drill right down to the machine
>> itself. Blinkenlights  is a (fairly standard in alt.folklore.computers)
>> reference to a front panel with binary lamps and switches.
>
> Ah, I remember the PDP11, was IIRC my first encounter with Unix.
> But the word 'blinkenlights' is new to me, I am in different language
country.
> Seems to be German-English ?? 'blinken' and 'lights'.

It's Dog German as practised in Britain, similar in principle to
Dog Latin where what is written bears a passing resemblance to
the language being dogged but is not part of that language.

eg, in Dog French, "Pas deux leur Rhone que nous" a
homophone for, "Paddle your own canoe", ie, "Mind your
own business"  :)

>
> That is simple to realize, connect some LEDs (via series resistor) to GPIO
pins,
> you got at least a byte, and use the other pins to multiplex.
> Maybe if you want to do it the big way with hundreds of LEDs:
>  
http://panteltje.com/panteltje/raspberry_pi_FDS132_matrix_display_driver/index.
html
>    I bought that display in the army surplus, basically shift registers and
LED drivers...
>    Had to modify it a bit... to connect to GPIO.

Thanks for that, a much simpler approach to getting a large number
of LEDs, already laid out in nice straight lines!


>> What I anticipate is using one Pi to drive the JTAG on another.
>
> Pi has JTAG? I must be getting rusty.

I hope so, the ARM A53 certainly has then in its spec.

> On my site you find a raspi JTAG driver for an FPGA proto board:
>   http://panteltje.com/panteltje/raspberry_pi/
>

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