Thanks Andy.
See below inline
------ Original Message ------
From: "andy pugh" <[email protected]>
To: "Marius Liebenberg" <[email protected]>; "EMC developers"
<[email protected]>
Cc: "Nicklas Karlsson" <[email protected]>
Sent: 2017-09-12 18:52:50
Subject: Re: [Emc-developers] Mesa RS-422 hal example (canopen
messages?)
On 11 September 2017 at 09:52, Marius Liebenberg
<[email protected]> wrote:
Yes I am aware of that. I will be using a very short packet message
system.
The thing I cannot get my head around is how my compoenent will
interface
with the mesa RS-422 port. Is it just a pin called MESA-XXX-RX and
MESA-XXX-TX and my component connect to that in hal or is it a low
level
interface of sorts. For this I have ot seen any examples.
There is some (very limited) documentation here:
http://linuxcnc.org/docs/2.7/html/man/man9/hostmot2.9.html#UART
You need a Mesa bitfile which puts UARTS on some of the 7i44 ouputs
rather than the default smart-serial. Until you haave UARTS in the
firmware you won't get anywhere.
Does this apply to the 7i80 or 7i44?
I do hope, eventually, to make the UART and BSPI configurable in the
same way as the absolute encoders. At the time I did the UART driver
the smart-serial auto-discovery wasn't there, so load-time pin
definition wasn't there. The absolute encoders use the smart-serial
dynamic pinout code.
Whatever you use, you need to find a way to work out where you are in
the byte stream. A synch-byte might already exist in the protocol you
are trying to use.
Does this imply that the data stream on the UART is not all mine and
that there are other info being sent ?
Does the mesa_uart.comp serve as an example only or is it a loadable
component. (sorry I dont have a linuxcnc machine running until later
tomorrow)
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916
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