Interfacing of GSM modem with 8051 microcontroller

Well as i have told u that gsm and gps will be interfaced thru uc.Since they can;t operate simultaneously so i am using nand operation so that i can use them but one at a time.First i will get data from gps and then switch to gsm to transmit it.That is wht i have thought till not.Tell me ur suggestion

Well as i have told u that gsm and gps will be interfaced thru uc.Since they can;t operate simultaneously so i am using nand operation so that i can use them but one at a time.First i will get data from gps and then switch to gsm to transmit it.That is wht i have thought till not.Tell me ur suggestion

"Tell me ur suggestion"

I suggest that you stop all this "ur" and other unnecessary abbreviation - as Per Westermark has hinted.

There is already a language barrier, and you are just confusing it further by over-abbreviating to the point of making your posts incomprehensible!

Please take the time to write your post in full, complete sentences using full, complete words.

The more effort you put into making your post clear and understandable, the more likely you are to get good help!

i?

u?

thru?

ur?

So, instead of talking about multiplexing a serial port, you throw in the word NAND, and expect the rest of the world to understand what you where thinking?

Then you specifically write that you don't know how to use a NAND IC. Why suggest a specific solution you don't know how it works, instead of describing the problem you have and ask for tips on how to solve it?

NAND gates are very general and can solve quite a lot of things, but multiplexing a number of signals (RX, TX and an unknown number of handshake lines) while making sure that the signals are non-inverted might not be the best situation to learn about the use of NAND gates.

I really recommend that you look at normal MUX chips, containing a number of two-to-one MUXes. They are trivial to use and very cheap. You could almost say that they where specifically made for solving this kind of problem...

If you people are uncomfortable with the writing then I will try to improve it now. I am new to the field of microcontrollers and I am reading it from the book of Scott Mcknzie. So,I will not be needing NAND operation.Instead I can use the two UART of 8051. Can anybody suggest me the algorithm of the program.What I have thought is that first of all microcontroller will take a string from gps reciever and pick the string of lattitude and longitude.After that the microcontroller will send the AT commands to the GSM modem to send the lattitude and longitude as a sms.

It seems like you already have the algorithm.

The only think that remains is the startup - to initialize the processor (I/O pins, serial ports, baudrate, interrupt handlers, time keeping...).

Yes,This is the idea which I have in my mind.But as I have told you that I am new to programming so I am facing alot of difficulty.If anybody can provide me a good keil tutorial other than available on this website or a good guideline so that I can continue my work.