How to initialize a uart

Ikk06 · Joined: 30 Nov 2009 Posts: 6

Hi I am new to pic c programming and I was wondering if anybody knows how to initialize the uart for asynchronous transmission on the pic18f252.

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

See this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=37010&start=14

Ikk06 · Joined: 30 Nov 2009 Posts: 6

When I checked the datasheet for my pic it said that I had to initialize the SPBRGH and the TXSTA. Is that not required to get the pic to send a message to the pc?

What if you wanted to connect another device to the pic such as a button, so that when you press the button a signal is sent to the pc?

Ttelmah · Guest

This is the fundamental difference between a compiler, and assembler. The compiler does a lot of the basic 'housekeeping' for you. So (for instance), you can just declare a variable, and the compiler decides where to actually put it in memory, and keeps track of it as you work. Similarly fo the UART, you just use the '#use rs232' line, and then getc, and putc to read/write data, and the compiler sets all the registers for you.
The button, is a separate thing. All you do, is input the bit value, and when it changes, or (better for a real button), when it has stayed the 'same' for a number of mSec, rsend your message.

Best Wishes