Page 244 - Build Your Own Quadcopter_ Power Up Your Designs with the Parallax Elev-8

Chapter 8: GPS and a Real- T ime Situational Displa y 223

pst : “Parallax Serial Terminal Plus” ‘ Terminal
tools
time : “Timing” ‘ Timing convenience
methods
xb : “XBee_Object_1” ‘ XBee communication
methods
lcd : “debug_lcd”

PUB Go | c

pst.Start(115_200) ‘ Start Parallax
Terminal
xb.start(7,6,0,9600) ‘ Propeller Comms -
Baud
xb.AT_Init ‘ Initialize for fast

xb.AT_ConfigVal(string(“ATMY”), 9) ‘ Set MY address to 9
xb.AT_ConfigVal(String(“ATDL”), 8) ‘ Set Destination Low
8

if lcd.init(LCD_PIN, LCD_BAUD, LCD_LINES) ‘ init returns True
started
lcd.cursor(0) ‘ cursor off
lcd.backLight(True) ‘ turn on backlight
lcd.cls ‘ clear display
lcd.str(string(“GPS Real Time Display V1.0”)) ‘ welcome
screen
waitcnt(clkfreq + cnt) ‘ wait 1 second
lcd.cls ‘ clear the screen
again
waitcnt(clkfreq/2 + cnt) ‘ wait .5 seconds

repeat ‘ Main forever loop
c := xb.rxCheck ‘ Check buffer
if c <> -1 ‘ If it’s not
(-1)
pst.Char(c) ‘ Then display the

terminal
lcd.putc(c) ‘ Display the same

screen

I chose to connect the LCD display to pin 19 because that is also a BOE servo port. That
way, I could use a servo cable to connect the LCD display with the BOE as I did in Chapter 7.