RE: TPU HELP Please!

Hi Chris

As to an RTOS like uCOS, it will be a major added complexity, unless you're
already very familiar with RTOSes.  It sounds more like you're learning your
way around microcontroller peripherals.

For clarification:  WHY would connect a serial TX line to a TPU?  Even more,
why connect an RX line?  Are you practicing RS-232 bit-banging for the pure
joy of it, or just to learn how to use the TPU?  Homework assignment?  I had
to do that once, using 2 GPIO pins on a 6809, and 1-2 timers, to emulate a
UART. 

>>  1:  Is it even possible to use the TPU in order to read RS232 data 
being sent through those 2 channels? <<

Yes, but only with considerable difficulty.


>>  3: Does anybody know if there are any built open source or freeware 
libraries that allow for easy reading of RS232 data by the MPC555 
processor through a TPU? <<

I would guess not.  You might find such code for a severely resource-limited
8-bit chip, where someone was  _forced_  to do this because they needed
minimal RS-232 functionality, had no UART/SCI/RS-232 peripheral, and could
not afford an external UART.

The MPC565 has 4 SCI UARTS, I assume the 555 has one or two.  Much easier to
RX and TX serial data using a peripheral that does that for a living!

I've occasionally wondered if I could make a QSPI peripheral behave mostly
RS-232-ish, when I ran out of real serial ports and had a left-over SPI
port.  However, I was never desperate enough to spend a week or four on it!

Good luck!

Rick Corey


-----Original Message-----
From: [email protected] [mailto:[email protected]] 
Sent: Saturday, September 03, 2005 10:54 AM
To: [email protected]
Subject: [MPC500] Digest Number 820


There is 1 message in this issue.

Topics in this digest:

      1. TPU HELP Please!
           From: "chriskoplan" <[email protected]>


________________________________________________________________________
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Message: 1         
   Date: Fri, 02 Sep 2005 23:20:57 -0000
   From: "chriskoplan" <[email protected]>
Subject: TPU HELP Please!

Hello... I am new to this group so before I go asking for help I 
figure I will introduce myself.  I am a Senior at Cal Poly San Luis 
Obispo studying Computer Engineering.  I have picked up a fun side 
project working with the MPC555 processor to help me to learn more 
about what it is to actually do some development.  I have 
successfully been able to send and receive data using intterupts 
through the QADC.  I also have even been able to use the TPU in a 
most basic form in order to make a servo that requires a constant 
pulse to move to a designated location.  The problem I now face has 
to do with the TPU in a more advanced way(but still probably 
relatively basic).  I still only sorta understand how the TPU works 
so I have a whole bunch of questions and I would really appreciate 
any advice or help.  I have connected a serial TX line to TPU B 
channel 0 and a serial RX line to TPU B channel 1.  The other board 
that I am trying to interface with sends out normal RS232 data.  
Here is a list of my questions.  

1:  Is it even possible to use the TPU in order to read RS232 data 
being sent through those 2 channels?

2:  I have read about the built in libraries that the TPU Function 
Library is distributed with the develpoment kit but none of them 
seems to work in a way that would be usefull... I took note of the 
Read/Writed Timers and Pin (RWTPIN) as being the most likely but 
that even seemed wrong.  If it is possible will one of those work or 
will I need to write my own tpu code?

3: Does anybody know if there are any built open source or freeware 
libraries that allow for easy reading of RS232 data by the MPC555 
processor through a TPU?

4:  I have read about OS's for microcontrollers such as the MPC555, 
such as uOS/II.  Would something like this make it easier for me to 
do basic developement?

I hope I have been clear about what my problem is but if I need to 
clearify, just say so and I will be more than happy to do so.  I 
have spent a long time trying to figure this out and haven't gotten 
anywhere very quickly.  I know I am asking a lot of questions  and I 
have a lot more but I am new to this and would really appreciat some 
experienced input.  

Thanks in advance,
Chris Koplan
CPE Cal Poly San Luis Obispo




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