WAITPEQ etc., What am I doing incorrectly?

Hugh · 2010-02-24 09:07

Hi,

I may be being thick here, but I have a bit of problem with WAITPEQ, etc.,

My first version of the code looked like this:

CON
  INPUT_PIN = 23
  SD_DATA  = 12
  ECH_PIN   =8

PUB doStuff
dira[noparse][[/noparse]INPUT_PIN]~
dira[noparse][[/noparse]SD_DATA]~~
dira[noparse][[/noparse]ECHO_PIN]~~ 

repeat
 if ina[noparse][[/noparse]INPUT_PIN]
      outa[noparse][[/noparse]SD_DATA]~
      outa[noparse][[/noparse]ECHO_PIN]~~
      numBytes++ 
 else
      outa[noparse][[/noparse]SD_DATA]~~
      outa[noparse][[/noparse]ECHO_PIN]~

Not very difficult and when the input pin went low (via an opto-isolator and lots of other stuff) the outputs (LEDs) would light.

The next stage was to try and use WAITPEQ to wait until the input went low, then use WAITPEQ again until it went high. The code I tried was to replace the content of the repeat loop with:

repeat
  waitPEQ (%10000000000000000000000, %10000000000000000000000, 0)
  outa[noparse][[/noparse]SD_DATA]~
  outa[noparse][[/noparse]ECHO_PIN]~
  waitPEQ (%10000000000000000000000, %10000000000000000000000, 1)
  outa[noparse][[/noparse]SD_DATA]~~
  outa[noparse][[/noparse]ECHO_PIN]~~

which doesn't work. All I am doing (or attempting) is to wait for pin 23 to be in one state then the other.

What have I missed?

Thanks
Hugh

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Hugh - the thinking woman's Geoffrey Pyke.

Gerry Keely · 2010-02-24 09:23

Hi

Should this not be

·"waitPEQ·(%0000000000000000000000,·%10000000000000000000000,·0)" 'test for·low state

·waitPEQ·(%1000000000000000000000,·%10000000000000000000000,·0)"· ' test for high state

regards

Gerry

Post Edited (Gerry Keely) : 2/24/2010 9:28:39 AM GMT

Hugh · 2010-02-24 09:41

Aha. Yes it should be.

Thanks - I had a TIA last week so am not as with-it as I normally am!

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Hugh - the thinking woman's Geoffrey Pyke.

MagIO2 · 2010-02-24 13:15

Still wrong, isn't it?

In your first code you set PIN 23 as input-pin. But your waitpeq waits for PIN 22 ..... remember, pin numbers start with 0

It's safer to say !<23 instead ... or define a constant that you use in both, the dira and the waitxxx-statement.

WAITPEQ etc., What am I doing incorrectly?

Comments