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
See I've been doing projects like Temperature Sensor and Regulator, Security Lock Code, Data Acquisition System doing? copying from the net? actually designing hardware? actually designing software?
If you want help show where you are, "I have" NOT "I need".
e.g. a code snippet can show better than a thousand words what you (do not) know.
Giving you "sample code" will just lead to frustration on both sides.
Erik
Surely you cannot accuse of me copying my projects from net, It's me who knows how much dedicated efforts and sleepless night i spend for my projects.
It seems that the only thing which made you all lunatic at me was me asking you for the sample codes and i also gave u a reason for that.
But nevertheless, can't we now just get back to the basics. I wasn't here for a duel with you all. Vehicle Tracking System is my BTech project and is dearly close to me. All I want is full support from your side. Because I know the deeper i go into the project, the more tedious it would be going to be. All you tech savvy people with great application oriented knowledge Pls be with me then.
No, it's the way that you totally ignored all suggestions, and showed no evidence of having done any work at all of your own!
"can't we now just get back to the basics"
OK - These are the things that you need to do now:
1. You need to use the database search to find some potential candidate processors that meet your needs (including the 2 UARTs). If you then need some help selecting from the candidates, ask specific questions (but be sure that you have studied the datasheets first).
2. You need to do some research into how to use the serial port on your chosen processor. As already noted, it really is an extremely common task - and, thus, there are plenty of tutorials, examples, etc readily available all over the web.
3. You need to do some research into handling the output from a GPS receiver. As already noted, NMEA is a long-established and widely-used format - so, again, there are plenty of tutorials, examples, etc readily available on the web.
4. You need to do some research into controlling modems using AT Commands. As already noted, this is a long-established and widely-used format - so, again, there are plenty of tutorials, examples, etc readily available on the web.
Note that this is the standard way to start any project - called the research phase - that's why it is important that you learn to do it yourself!
To do all this you will need to take advantage of resource such as:
* Internet search engines - such as Google;
* Manufacturer's websites - including this one - where you will find technical documentation, datasheets, application notes, reference designs, examples, etc, etc. Be sure to make use of the 'Search' facility on these websites...
* Your college library - where you will find books on programming, etc
"I wasn't here for a duel with you all"
So stop fighting, and start working! Show some evidence that you have done some work on this!
Here are some links to get you started: www.8052.com/.../160143 http://www.keil.com/download/ http://www.keil.com/books http://www.8052.com/faqs www.keil.com/.../search.asp
Your project requires 2 UARTs for its basic operation - so these will be dedicated to the GPS and GSM.
You also need to think about how you will monitor and debug your project. A "spare" UART can be extremely useful - some would even say invaluable - for this.
So think carefully before limiting yourself with only 2 UARTs - there are plenty of chips with 3 (and more!) UARTs...
You already have the link to identify such chips...
Thank you, I went through the link to identify the chips. As I am keen on working with 8051 family. I came across AT 89C51RE2. It had features which suites me well.There is no MCU with 3 UARTS(in 8051 family). Also 89C51RE2 doesnt have a feature called as " ON CHIP DEBUG" ....What exactly is on chip debug. What is the difference between ISP(In System Programming) and IAC(In Application Programming)
In-system programming means that you can download new firmware to the chip without desoldering the chip.
You sometimes have dedicated pins, and sometimes have pins with multiple function. You might for example have a SPI interface that is "normal" SPI when the processor is running, but is a programming interface when the reset signal is active.
In-application programming means that your own application can directly or indirectly reprogram some parts of the flash contents. You might for example be able to write new code to XDATA and this is aliased with flash memory.
By the way - why do you say no 8051 chip exists with 3 UART? What about Dallas DS80C400?
Yes I know about DS80C400 having 3 UARTS but in the previous thread forgot to metion 3 UARTS + ISP. NO MCU with 3 UARTS + ISP.
Also Pls help me with what is called as ON CHIP DEBUG
Please note the difference between a "thread" and a "post":
A "post" is a single messge by a single author;
A "thread" is a collection of related posts - usually from different authors.
This is pretty well self descriptive!
It means that the chip has debug hardware built-in.
This means that a debugger can directly access the "internals" of the chip - CPU registers, memory, etc - without needing any special software running on the chip.
Without on-chip debug, the only way to gain such access was to remove the chip and physically replace it with an In-Circuit Emulator - or "ICE" for short. Hence on-chip debug is often referred to (not entirely accurately) as "on-chip ICE".
Why?
You say that you can't find any 8051-family chips that meet your requirements; so why are you "keen" to use a family that doesn't meet your needs - especially when other families so clearly do!
OR, do you actually mean that you already know the 8051 architecture, and have the tools, and don't (think you) have time to learn a new one? That could be a good reason to stick with 8051, but you really need to be clear about the pros and cons - and not just make vague statements like, "I am keen on..."
Correctly said that I actually mean that you already know the 8051 architecture, and have the tools hence i am keen on working with 8051 family.
Also Pls help me with the selection of GPS. What parameters should i look for in my GPS receiver. One of my friends told me that look for GPS with 20 or more channels What does this statement exactly mean? What all parameters should i look for before buying a GPS receiver
More channels are obviously nice, but maybe even nicer: - a receiver that supports multiple satellite systems (GLONASS or maybe upcomming Galileo, ...) - a receiver that very quickly locks on. - a receiver that allows use of a super-cap or battery to keep information (last position, ephemeris) even when you turn off your equipment - this allows for faster tracking when you turn it on - a receiver with high sensitivity - a receiver with extended precision, supporting WAAS, EGNOS or similar. - a receiver that can emit multiple positions every second, to reduce problems with lag. - a receiver that supports the specific NMEA strings you want - or maybe you prefer SiRF Binary? - direct support for powering an active antenna. - low power consumption. - "correct" supply voltage. - suitable form factor. - ...
There are a huge number of parameters to think about when selecting a GPS. Number of channels it can track is just a single parameter.
What do we mean by Extended RAM (XRAM).It was stated in the AT89C51RE2 data sheet that it has On-chip 8192 bytes Expanded RAM (XRAM) – Software Selectable Size (0, 256, 512, 768, 1024, 1792, 2048, 4096, 8192 bytes)
When i tried Googling it the info was reagrding X-fi and XRAM used in games. I couldn't make out the difference between XRAM and other normally used RAMs
Pls Help
I thought you said you were familiar with the 8051 architecture?!
XRAM, in the context of an 8051, is memory accessed by the MOVX instruction.
It was originally called 'X' for eXternal - because it was physically external to the 8051 chip.
Nowadays, most 8051-derivatives have at least some MOVX-addresses memory on-chip - so some people (including some chipmakers) fudge the issue by trying to give it different names.
As far as the CPU - and, therefore, your code - is concerned, it is all just MOVX-addressed memory; it is irrelevant whether it is physically on or off the chip.
What do we mean by Extended RAM (XRAM).
The fact that you ask this puts the lie to your earlier claim that you were keen on using an 8051 because you "knew the architecture". You clearly don't.
"The fact that you ask this puts the lie to your earlier claim that you were keen on using an 8051 because you "knew the architecture". You clearly don't."
The reason why I asked you this because if it is XRAM it was external to the chip.But now since the datasheets say"ON CHIP XRAM" I was a little bit confused if its ON CHIP why is it "X".
Pls consider me worthy of something. Sometimes the question may sound too foolish but it is of great importance to someone