Comments (2)
kurbatov
commented on June 12, 2024
Hi @willishf,
I think implementation of OneWire support in firmata4j is doable. Unfortunately I don't have a OneWire device in my possession I could tinker with, understand how the protocol works and use for debugging. That's why it is hard for me to reason about details of implementation or implement it on my own. Although I've just submitted my vision of the interface firmata4j has to implement, I would love to see someone contributing OneWire support as a PR. For now I can only refer to the prior discussion on OneWire support #16 and summarize it here:
Firmata supports OneWire via sysex messages which are supported by firmata4j.
Firmata definies OneWire messages here: https://github.com/firmata/protocol/blob/master/onewire.md
The board should be flushed with ConfigurableFirmata which enables OneWire capability for the pins by default.
Here you can find the code that is responsible for sending a new pin mode message to the board. This method executes when OneWire mode is assigned to a pin.
I think it should be possible to extend Firmata for large data streams if not supported already. You can try to find an already existing feature that suits the task in the feature registry of Firmata or discuss your case there and propose a new feature. Newly proposed extension will probably require modification of the firmware though.
from firmata4j.
willishf
commented on June 12, 2024
In the process of getting Johnny-five as a node.js client which appears to
have extensive OneWire device support for firmata. This way I can do some
end to end testing in that I am also wanting to run on rp2040 wireless.
I will plan on implementing OneWire in firmataj following the i2c example
and will reach out if anything isn't obvious. Will do a pull request once I
have things working.
For long term testing the DS18B20 boards are $5 on Amazon.
The arducam camera is SPI based and appears that SPI support in firmata is
limited. Johnny-five based on reading GitHub issues has abstracted device
support out so that you don't need to connect to firmata. Thinking camera
support for image capture would be a virtual device addition to firmata.
Write to an IO pin take a picture and load into memory. Consecutive reads
of the pin would read image data based on max packet size. A hack but
solves the problem now that rp2040 has enough memory and speed/pins to do
these kind of things.
…On Wed, Feb 8, 2023, 8:37 PM Oleg Kurbatov ***@***.***> wrote:
Hi @willishf <https://github.com/willishf>,
I think implementation of OneWire support in firmata4j is doable.
Unfortunately I don't have a OneWire device in my possession I could tinker
with, understand how the protocol works and use for debugging. That's why
it is hard for me to reason about details of implementation or implement it
on my own. Although I've just submitted my vision of the interface
<https://github.com/kurbatov/firmata4j/blob/feat/one-wire/src/main/java/org/firmata4j/OneWireBus.java>
firmata4j has to implement, I would love to see someone contributing
OneWire support as a PR. For now I can only refer to the prior discussion
on OnWire support #16 <#16>
and summarize it here:
Firmata supports OneWire via sysex messages which are supported by
firmata4j.
Firmata definies OneWire messages here:
https://github.com/firmata/protocol/blob/master/onewire.md
The board should be flashed with ConfigurableFirmata
<https://github.com/firmata/ConfigurableFirmata/blob/master/examples/ConfigurableFirmata/ConfigurableFirmata.ino>
which enables OneWire capability for the pins by default.
Here
<https://github.com/kurbatov/firmata4j/blob/master/src/main/java/org/firmata4j/firmata/FirmataPin.java#L87>
you can find the code that is responsible for sending new pin mode message
to the board. This method executes when OneWire mode is assigned to a pin.
I think it should be possible to extend Firmata for large data streams if
not supported already. You can try to find an already existing feature that
suits the task in the feature registry
<https://github.com/firmata/protocol/blob/master/feature-registry.md> of
Firmata or discuss your case there and propose a new feature. Newly
proposed extension will probably require modification of the firmware
though.
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Related Issues (20)
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