This is a multi-part message in MIME format.
--------------7EC734238BF56B6934ECD107
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

I'm trying to simply poll the RS232 RCV pin in oder to detect incoming
characters and upon doing so store the character in a buffer to be
displayed to the terminal at a later point in time. I should explain
that i know this can be easily done using the hardware usart of the PIC
with the use of interrupts but for my current project, i need 2 serial
ports on one PIC hence my trying to achieve this in software.

i'm using PIN_B0 as the RS232 Rcv pin. That's because it has an external
interrupt. So i should get an INT_EXT interrupt whenever a new character
comes in.

the problem is that for some reason, my INT_EXT routine never gets
called! :( i have checked everything to the best of knowledge and
everyhting seems to be configured/wired up correctly. I have also gone
over the code several times and can't see anything wrong with the code
so what am i missing? weird thing is that it's xmitting fine! it's just
the rcving giving me a head ache!

pls find my code attached. BTW, i'm working with PIC16C73A.

any ideas please?
seyi



--------------7EC734238BF56B6934ECD107
Content-Type: application/x-unknown-content-type-C_auto_file;
 name="Sw_usart.c"
Content-Transfer-Encoding: base64
Content-Disposition: inline;
 filename="Sw_usart.c"
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==
--------------7EC734238BF56B6934ECD107--

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics