Pic to Pic communication

[ruijc]

Hi fignewt,

a few thoughts you may try...

Since RC2 could be used as Analog, its important to set it as digital ( like Joe just told you ).
The Debug/Debugin DEFINES should place the pin output/input, but is never too much to declare it anyway.

Separate the RX from the TX and connect them to the PC and use the MicroCode Studio's serial communicator to see if each one is working before connecting them together.

I believe that it will work with the internal OSC, but you can try with an external osc and see, but...
Did not see any reference on the internal OSC speed. The default is 4Mhz, but use this:

osccon=%1100111
DEFINE OSC 4

[EarlyBird2]

A long time ago Bruce helped me with I2C comms between chips. I was having problems because it was so easy. As an example here is the slave code. I built a board with an address selector switch connected to port C so that I could place them on a Bus without having to reprogram them. The Slaves are monitoring inputs from Volt Free Contacts conected to Port B.

' PicBasic Pro I2C slave program - PIC16F72/PIC-X1
    ' bootloader and OSC settings
'DEFINE LOADER_USED 1 ' bootloader
DEFINE osc 20
INCLUDE "modedefs.bas"

' Alias pins
scl     VAR     PORTC.3         ' I2C clock input
sda     VAR     PORTC.4         ' I2C data input


' Define used register flags
SSPIF   VAR     PIR1.3          ' SSP (I2C) interrupt flag
BF      VAR     SSPSTAT.0       ' SSP (I2C) Buffer Full
R_W     VAR     SSPSTAT.2       ' SSP (I2C) Read/Write
D_A     VAR     SSPSTAT.5       ' SSP (I2C) Data/Address
CKP     VAR     SSPCON.4        ' SSP (I2C) SCK Release Control
SSPEN   VAR     SSPCON.5        ' SSP (I2C) Enable
SSPOV   VAR     SSPCON.6        ' SSP (I2C) Receive Overflow Indicator
WCOL    VAR     SSPCON.7        ' SSP (I2C) Write Collision Detect



' Allocate RAM
result	VAR		BYTE			' ADC result
datain 	VAR     BYTE			' Data in 
readcnt	VAR     BYTE            ' I2C read count
I2Caddress	VAR		BYTE			' Our address	


' Initialize ports and directions
        TRISA = %11111111
		TRISB = %11111111
		TRISC = %11111111
' Initialize I2C slave mode reading inputs from hardware address settings
        I2Caddress=0
        IF PORTC.0=0 Then I2Caddress=I2Caddress+1
        IF PORTC.1=0 Then I2Caddress=I2Caddress+2
        IF PORTC.2=0 Then I2Caddress=I2Caddress+4
        IF PORTC.5=0 Then I2Caddress=I2Caddress+8
        
        
        SSPADD = I2Caddress		' Set our address
        SSPCON = $36			' Set to I2C slave with 7-bit address
        

While 1>0
      
        While NOT SSPIF
        Wend			' Check for I2C interrupt flag

		SSPIF = 0				' Clear interrupt flag
        IF D_A = 0 Then
        readcnt = 0		' Mark as first read
        EndIF
      
	
        SSPBUF = PORTB	' Get data from array
        CKP = 1                 	' Release SCL line
        readcnt = readcnt + 1   	' Move along read count
 Wend

Steve