Learning how to use USART

[keithv]

I'm trying to get one PIC to talk to the other. I'm not using MIDI messages at this point, but I am using MIDI hardware to connect the two PICs. The schematics are found here https://www.tigoe.com/pcomp/code/picbasic-pro/161/

I'm using two 16F887. One is the transmitting PIC. MIDI out hardware is connected to pin 25/portc.6/TX. I'm trying to send the numbers 1 ~ 9 every 600ms. An LED blinks each time it's supposed to send just to let me know that it's doing something.

The other PIC is supposed to receive the number and display it on an LCD. The MIDI in hardware is connected to pin 26/portC.7/RC. I made the LCD display "ready to receive" at start up so I know that it's working.

The blinking LED on the transmitting PIC is working, and the LCD on the receiving PIC is working, but I'm not seeing any numbers being displayed.

Here's the code for the transmitting PIC:

define OSC 20
define HSER_RCSTA 90h
define HSER_TXSTA 20h
define HSER_BAUD 31250


ANSEL = %00000000
ANSELH = %00000000
TRISD = %00000000
TRISE = %00000000
TRISA = %00000000
TRISB = %00000000
TRISC = %01000000


send var byte


main:


send = send + 1
hserout [send]
PORTA.0 = 1
pause 300
PORTA.0 = 0
pause 300
if send >= 10 then
    send = 0
endif


goto main

Here's the code for the receiving PIC:

CLEARdefine LOADER_USED 1
define OSC 20
define HSER_RCSTA 90h
define HSER_TXSTA 20h
define HSER_BAUD 31250
define LCD_DREG PORTD
define LCD_DBIT 0
define LCD_RSREG PORTE
define LCD_RSBIT 0
define LCD_EREG PORTE
define LCD_EBIT 1
define LCD_RWREG PORTE
define LCD_RWBIT 2
define LCD_BITS 4
define LCD_LINES 4
define LCD_COMMANDUS 2000
define LCD_DATAUS 50


ANSEL = %00000000
ANSELH =%00000000
TRISD = %00000000
TRISE = %00000000
TRISA = %00000000
TRISB = %00000000
TRISC = %01000000


data_in var byte


pause 250
lcdout $fe, 1
lcdout $fe, $d4, "ready to receive"
pause 500
lcdout $fe, 1
pause 250


main:


hserin [dec data_in]
pause 5
if data_in != 0 then
gosub display
endif
goto main


display:
lcdout $fe, 1
lcdout $fe, $94, dec data_in
data_in = 0
return