Re: Looking for a bit of guidance
- From: "Chr15" <csemanso@xxxxxxxxx>
- Date: Mon, 26 Jan 2009 10:12:17 -0600
You'll have to excuse me if I don't get back to everyone's concerns, but I
think I've done a good job in summing up :)
That was my first thought too. A PPC is a hell of a system to learn if
all you know are PICs and H8's. Who ever gave you this project is
either an idiot or trying to get you fired.
I don't disagree with any of you in this regard, the more I read through
the manual the more complicated it becomes, not to say I don't want to
learn about it; the whole reasoning behind me posting here actually :)
Im well aware of the scarceness of this processor due to this mostly
professional use, and I've tried to explain a few times how over board this
processor is going for what they want to do. I don't think its either
idiocy or someone wanting to cause me grief, but the individual that chose
this processor lack of understand of embedded tasks (its for a College
research group, not comerical/industrial use so cost isn't a factor).
This project is more of a one off project, with hardware already built up
around the processor; without successfully running code on it(wish I could
insert a facepalm smiley here), not a practice I encourage or agree with.
Do you have any connection to Freescale or ST?
The PPC parts are wonderful parts and very powerful I have used them,
The part seems a bad fit for the job in hand.
The group did have a connection to ST, but it turned out not as strong as
I'd had hoped (The MPC56xx looks to be new-ish and different enough than
the 55xx to make it unique, thus not a lot of support on their end) as for
Freescale I did manage to create a tie with the local distributor in order
to obtain a [donated] evaluation main board which is a huge step in the
right direction (considering this group only had access to the mini board
prior to me being here).
I fully agree with every ones opinions in that this part is way, way,
overkill for the task asking to be done. Even hardware issues(pad spacing
in relation to the clock frequencies being ran causing EMC issues on user
built boards, for example) have been quite extensive. I think this part
was chosen because of its common use in automotive applications (this small
group focuses on Hybrid and Power electronic research).
I hear everything your saying. But, sadly, I don't have the option of
just simply, 'handing' the chip back,
Why?
As I should have stated before, hardware has already been built up around
the processor, causing the research group to be kind of locked into this
choice. And me being the 'low man' on the totem poll so to speak (as well
as coming in after the choosing of this processor), I figured I would try
to 'roll' with the punches in order to try and figure out what needed to be
done.
I am well aware of the task ahead (and its possible impossibility at my
level of experience), but hopefully I've explained my self a little bit
better than in my original post :) I think I'll start talking to my ST/FS
contacts more.
The goal of the device is to implement a PI based phase shift control of a
PWM wave, according to current/voltage/temperature AD readings, to charge a
high voltage battery off the power line, as well as have some CAN
communication with other devices.
.
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