Re: Strange GSM modem behaviour

In comp.arch.embedded,
Rav <rav.tech.cs@xxxxxxxxx> wrote:
Hi,

I am using one Wavecom 2403A GSM modem interfaced to AVR AT90CAN128
microcontroller. Here, in the code i am sending AT command for sending
SMS to an arbitrary cellphone. I am using USART0 of the controller to
send the characters to my GSM modem. The AT command and the SMS text,
both are hardcoded into the source.
After compiling and flashing my controller, i wait for sometime
staring at my cellphone but nothing comes. However, during the course
of debugging the code for which i am using JTAG, if i step through the
line in the while loops of functions cmdSendGSM() and SMS_SendGSM()
then after coming out of the SMS_SendGSM(), i am pleased to find that
SMS is received on my cellphone. The same doesn't work when i flash my
controller and Reset it. I have tried putting delays at various
position between successive sending of characters but it doesn't work.

Have you made sure all your hardware handshake lines (RT, CTS, etc.) are
at the apropriate levels?

--
Stef (remove caps, dashes and .invalid from e-mail address to reply by mail)

.

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