[oopic] Re: Roboteq motor controller.

--- In oopic@yahoogroups.com, "topservice77"
<alessandro.cofanelli@...> wrote:
>
> I have a roboteq motor controller i want to use with an OOPIC board.
> The only allowed way to control the roboteq is via serial port
> configured at 9600 baud, 7 bit, even parity, 1 bit stop. How can i set
> the oopic to use this configuration for serial communication? I tried
> with oSerialPort, oSerialH and oSerialLow but i'm unable to set the 7-
> bit, even parity and 1 stop bit. I'm able only to set baud rate.
> Moreover, can i use I/O lines different from 22 and 23 to control the
> roboteq hardware? (i have 2 controllers, so i need two serial ports)
>
> can someone help me????
>
> Thank you
>

Too bad about the even parity. You can take the lower 7 bits of the
character to be sent, figure out the parity bit and tack it on the end
to form an 8 bit character. Doing so, with the OOPic, will be time
consuming and difficult. I guess you could precompute each possible
character somehow.

If I really had to do this, I would use a CPLD. It would have 8
bidirection IOLines connected to bidirectional lines of the OOPic and
a couple of control signals: one to latch the current input from the
OOPic output (7 bit char) and another to enable the output from the
CPLD to the OOPic (to read the 8 bit char). A Xilinx XC9536 would be
my first choice.

Don't worry about the stop bit. It only wants one, it will accept more.

You can use oSerialL as a bit-banged serial port on any IOLine. You
still have to shift to RS232 levels to be equivalent to the PC.

I see three choices:

1) use a different motor controller
2) use a different microcontroller
3) learn how to code and program CPLDs.

It's interesting that the underlying PIC won't do 7 bit + parity
either in that it won't form the parity bit. The Atmel ATmega128
will... I would bet that is common across the AVR line of chips.

Richard

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