I am trying to communicate with the GPRS modem (i.e. Siemens MC75) using USART library of AT91SAM9263-EK.
But the behaviour of the modem with USART is not consistent.
To get response from MC75, I have to write same command multiple times(around 20 to 25).
I am trying with following settings of USART...
->Asynchronous mode
->8 data bits
->no parity
->1 stop bit
->Normal CHMODE
->115200 Baud rate
But I want response from modem by writing command at once.
Suggest me any modification if needed or necessory steps to be followed.
(Note: GPRS modem (Siemens MC75) is working properly with hyper -terminal in windows platform.)