I am using a Arduino with an integrated GSM shield of open-electronics.org. The board is called GBoard of Iteadstudio (http://imall.iteadstudio.com/special-product/im120411004.html). I am using the new GSM library of open-electronics.org (http://code.google.com/p/gsm-shield-arduino/). The board is running nicely when I set the SIM900 module to software UART.
Now I tried to run the SIM900 module in hardware UART mode. I set the jumpers like in the picture attached (UART hardware mode). But I think I have to change somewhere also PIN settings. In the GSM.cpp file there is the following code.
//De-comment this two lines below if you have the //first version of GSM GPRS Shield //#define _GSM_TXPIN_ 4 //#define _GSM_RXPIN_ 5 //De-comment this two lines below if you have the //second version og GSM GPRS Shield #define _GSM_TXPIN_ 2 #define _GSM_RXPIN_ 3
I toggled the comments and de-comments, but this was not the right place.
Has anybody an idea how to solve this?
Can someone also explain me, what is the advance/disadvantage when I am using software or hardware UART for the GSM module. Or what is the difference? Is one of both faster?
Thanks a lot in advance.