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From: "Bob Axtell"
Subject: Re: Which Microcontroller to use?
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NNTP-Posting-Date: Fri, 20 Sep 2002 07:48:14 CDT
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Date: Fri, 20 Sep 2002 12:48:14 GMT
You asked the question "which uP to use" so here's my 2 cents. Microchip
will unquestioningly be the lead player in the future, as they have
high-performance products, provide excellent development tools, and the
products are reasonable. They are #1, and have earned that position.
The use of a high-level language is a choice of individual choice for the
project to be performed. But being an old guy, doing the same thing for
almost 30 years, I can tell you that your client will start out allowing a
high-level language, then later require a redo to assembler for performance
or cost. It happened so often that I finally wrote everything in assembler
and have huge libraries of debugged routines to pull from.
"Derek Agar" wrote in message
> I am an EE student involved in a Senior Design class. While I have
> had low level digitan design (constructing adders/subtractors ... from
> gates), and have done some simple programming on a gal16v8 FPGA, I
> have not done much more than that.
> My question is what would be a good microcontroller (or should i look
> to a good fgpa) to use for my design?
> My group is implementing a car that follows another car based on
> sonar. The microcontroller needs to:
> 1) Output a 35khz signal and a 45khz signal for about 250us
> 2) Send a signal to Reset the voltage trigger.
> 3) Start a counter/timer and wait for the 2 responses to get back.
> (stop the car if no responses after 40ms)
> 4) Fill the 2 registers with the value of the timer at the time of the
> 5) After the 2nd response comes back, calculate the distance that the
> car is away from the lead car and determine if the car needs to speed
> up/slow down/stay constant and send this value to a Pulse code
> modulator that will drive the motor.
> 6) Also determine if one of the sensors is detecting that it is
> further away than the other and how much and drive a stepper motor to
> control the steering.
> I don't see speed of the processor as being an issue (we are looking
> at a 1MHz crystal and most of the microcontrollers that I looked at
> will do way above that)
> We are looking at having an external voltage trigger, so we may not
> need a voltage comparator.
> I have done some C programming and would find that easier than to get
> into assembly language, but I am not against it.
> Thanks in advance
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