Re: Fwd: Re: LIRC on a microcotroller

[W.P. <lau...@wp...>]

W dniu 15.10.2016 o 08:14, Bengt Martensson pisze:
> On 10/14/16 21:55, W.P. wrote:
>> Hi guys,
>>
>> if interested:
>> - I have (partially) developed a small project on AVR uC: - "LIRC super
>> pilot".
>
> Nice. Why don't you put it on Github (or similar)?
>
>> This would allow to get hard-realtime stuff out of Linux box, at low cost.
>>
>> As for now (development stopped 2014, have no more prototype board), it
>> consists of Mega328 + 24C256 EEPROM, IR LED + IR receiver (schematic
>> available).
>
> As an alternative approach, I suggest using a cheap board like e.g.
> "Arduino Nano", which can be had in cloned version for less than 3 EUR.
> See http://www.harctoolbox.org/arduino_nano.html for my project. For the
> corresponding firmware, see https://github.com/bengtmartensson/AGirs .
> (This uses the Arduino framework, which is essentially the Gnu AVR tool
> chain.)  The firmware can be used from Lirc using the girs driver,
> contained in current (upstream) Lirc.

Using Nano frees me from (almost) building test board :). I use it 
already for another project.

My approach, for sending at least is much simplier, even "echo" works.

But will take a look at Your project.

>
>> Remark: I2C EEPROM (for storing remote definition) is too slow. Need to
>> use SPI EEPROM/flash. [it parses command line, searching for remote/key
>> -> code family / code definition. For 1 remote with ~40 keys it takes
>> almost 1s. And response should be immediate - from human point of view]
>
> In that firmware, you can store predefine commands, presently in raw
> form, as Nec1-, or Rc5-commands. (Yamaha uses Nec1). The problem is to
> have it  to fit into memory. The main trick here (note that Atmega is a
> Harvard architecture, with "much" flash, "litte" RAM) to get the payload
> into flash, without using RAM. 40 commands should not be a problem on an
> Atmega328, provided that they use a "cooked" format.
>

I've been thinking about SPI flash, it's fast and has capacity up to 
several megabytes.


W.P.

> Greetz,
>
> Bengt
>
>
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