This is embarrassing

wirecutter

Hello,
I am working through a book on spin programming and this bug popped up,.
"ERROR: Expected an instructio or variable"
In this section that reads:

pub Go
dira [output_pin]~~ ' set pin to output
outa [output_pin]~ ' make pin low output
dira [input_pin]~ ' set pin to input
repeat
if ina[input_pin]==0 ' check pin for high or low
turnOn_LED ' method call
else
turnOff_LED ' method call

It tells me the line " turnOn_LED" has the error
I typed it exactly as in book, can someone explain what is wrong?

it wont let me archive it.

thanks,
wirecutter

kuroneko

Do you have methods named turnOn_LED and turnOff_LED in your SPIN file? If not maybe the book you mention assumes that those methods should be implemented by yourself? It would also help if you could tell us which book you are referring to.

wirecutter

Hello,

Here is the full code.

{{ 12 sep 09 Harprit Sandhu
ButtonLED.spin
Propeller Tool 1.2.6
Chapter 15 program 1

Program turns on LED if input has been pulled up is grounded
}}

con

_clkmode = xtal1 + pll2x ' system clock spec
_xinfreq = 5_000_000

input_pin = 23 ' input pin
output_pin = 27 ' output pin
inv_high = 0 ' invert high state
inv_low = 1 ' invert low state

pub Go
dira [output_pin]~~ ' set pin to output
outa [output_pin]~ ' make pin low output
dira [input_pin]~ ' set pin to input
repeat
if ina[input_pin]==0 ' check pin for high or low
turnOn_LED ' method call
else
turnOff_LED ' method call

PRI turn_On_LED ' method to set the LED line high
outa[output_pin] :=inv_high ' sets the LED high

PRI turn_Off_LED ' method to set the LED line low
outa[output_pin] :=inv_high ' sets the LED low

The book is called "Programming the propeller with spin"
Tab book ISBN# 978-0-07-171666-6


Thanks,
wirecutter

kuroneko

repeat
   if ina[input_pin]==0          ' check pin for high or low
     turnOn_LED                  ' method call
   else
      turnOff_LED                ' method call
    
PRI turn[COLOR="red"]_[/COLOR]On_LED                   ' method to set the LED line high
    outa[output_pin] :=inv_high   ' sets the LED high

PRI turn[COLOR="red"]_[/COLOR]Off_LED                   ' method to set the LED line low
    outa[output_pin] :=inv_high   ' sets the LED low

Note the different spelling between how the methods are called and how they are defined. Looks like lousy QA/QC if that's a straight copy from the book.

wirecutter

I guess your right, bad QA. this is the first time this happened and didn't notice it.

thanks
wirecutter