USART read problem in PIC16F877A

[mahadev]

Hi,

I am using the PIC16F877A with GSM module (SIM900A) & want to read the SMS through USART. I am able to send the sms but not able to read it.
1. How to use the interrupt to read the GSM module response?
2. what care is required for interrupt of RS232 receiver?

Please, any one can share the c source code of it.

Thanks,
Mahadev

[temtronic]

Consult the ex_sisr.c example program in the examples folder that CCS kindly supplies. It shows you a working example of using 'circular buffers' for receiving serial communications.

Also be sure to add the option 'errors' to the USE RS232(....) declaration.

[asmboy]

To get detailed help -
post your COMPILER Version
and the code in question - using only KBHIT as a detector of code means you are really only polling the USART - and if net program delay takes more than TWO character receive intervals - you will for sure lose RX chars.

Be sure to check the example isr code too.

BTW - from my experience - the 16f887 is a FAR better chip with better USART support from CCS than the 877 and at A MUCH LOWER price from any legit distributor on this planet -- it just slays me to see so many requests about the old 877 ......