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Hi I want to connect GSM modem to the STRE912 board I configured the uart which can recieve interrupt from modem I am using uart 0 for connecting the modem and uart 2 to debug the application but the modem is giveing timeout errorthe processor is str912Fw44 I used both ways ( by RS232 as well as TTL level to connect to the modem) but it gives timeout error
See: http://www.keil.com/forum/docs/thread13646.asp
What, exactly, do you mean by "the modem is giving timeout error"?
What commands do you send it, and what responses do you get, prior to getting this "timeout error"?
What happens if you perform the same commands manually using hyperterminal, or similar?
What does the modem's Mnanual say about this "timeout error"?
"I used both ways ( by RS232 as well as TTL level to connect to the modem)"
This sounds like you are guessing; it should be clear from the documentation what levels you need - if it's not clear, then either you haven't spent enough time researching this, or you don't yet have sufficient documentation to proceed...
in nut shell I want to connect a GSM modem to str912based board that I purchased from olimax .com STR-E912 based board if any one had done the same thing with the olimax board then please let me know how to configure it in uart 0
You don't mean olimax.com, do you?
This is olimax.com: http://www.olimax.com/
People reading this might guess that this is a careless mistake, and guess that you mean Olimex - but compilers and other software tools won't give you any such slack!
Therefore it is important for you to be very much more careful to pay attention to details!
A careless slip like this could well be the difference between your project working, and not working.
I am sorry it was www.olimex.com/.../index.html
STR-E912 based board
Good.
Now, how about answering my earlier questions about this "timeout" that you're seeing...?
I get AT+CMIS then I get the error time out
oone more thing is there any effective way to debug the modem
previously I used uart0 to connect my modem then I used uart 2 to see the printf messages actually I need some effective way how to see wat is transmitting to modem and what modem transmitting to the controller?
Is it not that a serial port can be full-duplex? you have a separate RX and a separate TX line (but they are not compelled). so, you can get along with one UART. And, isn't looking at the serial data actually "debugging the modem"?
"I get AT+CMIS then I get the error time out"
You still haven't said exactly what this "timeout" error is? Or where does it come from?
What do you mean "I get AT+CMIS"?
Surely, AT+CMIS is a command that you send to the modem?
Another thing that can be done - but most often when you do not have access to the source code or do not want to change anything in a system - is to connect a sniffer.
Take tx and ground and wire to a separate RS232 connector.
Take rx and ground and wire to a separate RS232 connector.
Now you can use a PC with two serial ports - one serial port will monitor data sent in one direction, and one serial port will monitor data sent in the other direction.
Buy or locate a good log program that will time-stamp all data, and that can be taught to look at framing when time-stamping and presenting the transmitted data.
Your Olimex board has JTAG - use it!
www.olimex.com/.../str-e912.html
IF you don't have a JTAG adaptor, debug you code in the Keil Simulator - direct the USART IO to a COM port, and connect the modem to that COM port
Have you actually tested the command sequence you are trying to use - eg, by sending it manually from hyperterminal, and observing the modem's responses...?
eg, what is AT+CMIS supposed to do...?
dear neil
I solved the problem it was due to not properbaud rate thanks for your valuable time and reply now I have to convert same code to RTX kernel
thanks