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» Lab » Ping-Pong via SerialPIC or InfraPIC

Project:Ping Pong
Source Code:PIC BASIC
PIC:16F628
Interface:SerialPIC or InfraPIC
Author:Ravi Deo
Last Updated:7th April 2005

Proto Proto

Project Description

This sample PIC project demonstrates demonstrates wired and wireless bi-directional communication. It also demonstrates how to use a PIC16F628 with SirPic, to receive (ping) and transmit (pong) characters using the SERIN and SEROUT command.

Project Download

Ping-Pong : Zip file containing BAS and HEX files.

Hardware Schematic

This project uses an external 4MHz resonator for a clock signal. The PIC receive and transmit pins connect to the SerialPIC or InfraPIC interface. The PIC communicates with SirPic on Palm via the interface. SirPic locally echoes the transmitted character, followed by the incremented character, returned by the PIC.

Schematic

Source Code

The source code comprises of a simple loop which waits indefinitely for a character. The character is then incremented and transmitted back to the sender. 
include "bs2defs.bas"
DEFINE CHAR_PACING 10
char VAR byte

loop:   
	SERIN  PORTB.1,T9600,char   ' wait for a character
	char = char + 1             ' increment it
	SEROUT PORTB.2,T9600,[char] ' transmit it back  
	Goto loop

SirPic Settings

If you are using the wireless InfraPIC interface, the Communication and Options settings should be configured as shown below. However, if you are using the wired SerialPIC interface, then use "Port: Serial (RS232)".

16f628   16f628

Local echoing of characters will allow you to see the transmitted character, as well as the received incremented character.

SirPic Output

Power up the PIC application, and begin logging data on SirPic. Using the grafitti pad, enter "A", this should be locally echoed on the screen. This character should immediately be followed by the character "B" (reply from PIC).