Hey all,
I am doing a project on Vehicle Tracking System using GPS and GSM Modem.The 2 devices aforementioned communicates with 8051uC. But since there is only 1 UART in 8051 i have to use a analog multiplexer i.e CD 4062. I want to know how to interface it with GPS, GSM, and 8051.
Also it would be grateful if anyone could tell me how to parse output of GPS and how initialize a GPS receiver to that it starts giving me the GPRMC
Why do you think this world has so many different GPS modules? Every customer has his own needs.
Only you know what parameters are important to you. That was why I did post a short list of parameters to think about. There are more parameters too: - type of connection (surface-mounted, pin header, bluetooth, ...) - price - availability - availability of good documentation - temperature range (industrial, automotive, military, ...) - civilian or military (max speed, height, jerk, ...) - fully intelligent GPS or using your processor for the computations. - support for real-time GPS correction. ...
The list can be made almost infinitely long.
You must make the requirements list.
You must give different requirements different weights.
You must figure out which GPS gets best score.
My "best" GPS is not your "best" GPS.
For a school project, it's enough that it uses supply and signalling voltages you are able to interface, a connector you are able to interface to, and the ability to detect satellites in the environment you are going to demonstrate the design in. All else are just optional extras. If you have special goals with your project, then you obviously have to bring in more parameters when scoring the GPS - we don't know what these parameters may be because we don't know your goal.
There are more parameters too
and a very important one if you plan to use it downtown
dead reckoning
downtown you will be lost without it
Erik
I'm basically planning to write C program and in some parts combining with the assembly too. i.e 1)Inputting the data and processing it(Byte manipulation)i think i would do in C eg String comparison by strncmp(). u would have got an idea.
2) Bit manipulation such as SETB PSW.3 CLR PSW.3 I Intend to do by Assembly, Creating delays (since assembly provides exact delays using Timers)
Hence my program would be a combination of C and Assembly
Yes, it's good to use both 'C' and assembler for their particula advantages - but the 2 examples you gave don't actually require assembler!
"2) Bit manipulation such as SETB PSW.3 CLR PSW.3"
There is no need for assembler there - Keil C51 can do that perfectly well.
See: http://www.keil.com/support/man/docs/c51/c51_extensions.htm
"assembly provides exact delays using Timers"
Assembly has no particular advantage when using the hardware Timers - because it's the hardware that controls the timing, not the software.
It's when you're trying to do software delay loops that you need assembler...
See: www.8052.com/.../162556
(note that software delays are not generally a great idea)
Yes, that'd be an appropriate place to use 'C'.
But note that writing in any High-Level Language (HLL) means (among other things) that you delegate use & control of the CPU registers to the compiler.
So this answers your earlier question about using registers or "memory" (sic) for your data...
I usually do my projects(or would say have done my projects)in ASM.I would be doing embedded C for the first time. I went through all the examples from Mazidi.Now I can even write my programs in C(In fact it makes work lot easier). But when it comes to wwriting C and assembly together I'm stuck. I went through the tutorial at :www.8051projects.net/.../mix-c-and-assembly.php
I wasnt able to understand a thing. Can u all post a link from where I can learn mixing C and assembly.Or any book u can suggest.Regarding books I've downloaded " Embedded C :Michael J. Pont" Pls help