SEROUT command replaces a variable

T3rr0rByte13 · 2012-01-27 23:51

I am having an issue where the serout command replaces a variable i am using to store the value of IR detection. I am using a boebot with the easy bluetooth module.

the below is just a snippet of code from the program, all variables are declared.

do
freqout 2, 1, 38500
irDetectLeft = IN0

freqout 8, 1, 38500
irDetectRight = IN9

serout TX, baud, ["3"]
serout TX, baud, ["2"]
serout TX, baud, ["1"]
serout TX, baud, ["0"]

debug home, BIN1 irdetectleft, BIN1 irdetectright
loop

The problem is when the debug command shows up I see: 11 and 10 when both IR's are triggered.
However commenting out the serout commands, the debug command shows: 00 when both IR's are triggered

What am I missing??

walkin79 · 2012-01-28 03:22

sorry i dont know how to delet the message

walkin79 · 2012-01-28 03:25

same problem sorry

Mike Green · 2012-01-28 08:59

The SEROUT command cannot replace a variable. There must be something else going on in your code that we can't see from the fragment you've posted. Sometimes the SEROUT statements add enough of a delay (about 1ms per character sent) that something time-dependent gets thrown off.

walkin79,
Use the Edit Post button at the bottom of your messages. You'll see a Delete button in the row of buttons at the bottom of the edit window.

T3rr0rByte13 · 2012-01-28 13:09

okay I created a new file to simplify everything, this is the entire program. The code is below. Still the same issue.

' {$STAMP BS2}
' {$PBASIC 2.5}

FREQOUT 4, 2000, 3000
RX PIN 2
TX PIN 0
Baud CON 84
irDetectRight VAR Byte
irDetectLeft VAR Byte
  DO
  FREQOUT 8, 1, 38500
  irDetectRight = IN9
  FREQOUT 2, 1, 38500
  irDetectLeft = IN0
  DEBUG HOME, BIN1 irDetectright, BIN1 irDetectleft
  SEROUT TX, Baud, ["3"]
  LOOP
  RETURN

Mike Green · 2012-01-28 13:31

The problem is that you're using the same I/O pins for RX and TX as you're using for the left sided IR LED and detector. You're using pin #0 as an input for IR distance detection and as an output for the SEROUT. You're using pin #2 as an output for the IR LED and, presumably, you were going to use a SERIN on the same pin.

The SEROUT sets pin #0 to output mode so the IN0 will return the state of the output register (OUTS) bit rather than the input status of the I/O pin. Putting an INPUT 0 statement after the DO will reset I/O pin #0 to input mode, but you really have to use a different I/O pin for RX and TX.

T3rr0rByte13 · 2012-01-28 13:41

I changed the IR LED input to pin 3 and the IR detector to pin 1 and it works like a charm! Thanks Mike.

SEROUT command replaces a variable

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