pin6 & pin7 stay on or stay off....

[brittio]

I'm in the process of making LEDs chase and I'm using all 8 outputs on my Prop1.  Pin6 and Pin7 either stay off or stay on depending on where my jumpers are. 

How do I get them to act like the other 6 pins?

[JonnyMac]

Move them to the DN position which forces the processor to activate the ULN outputs.

[brittio]

I apologize...  I only mess with my Prop1s around Halloween so there always seems to be a learning curve. 

I tried moving the jumpers again and got the same results.  with the jumpers DN my LEDs stay turned off.  with the jumpers UP my LEDs stay turned on.  I also tried removing the jumpers all together, but the LEDs still stay turned off.  All of my other LEDs (pin0 thru pin5) are acting as expected.  Is that a sign that somethings bad or is there something else on the board that could affect this?

[JonnyMac]

With the jumpers in the DN position the P6 and P7 will behave like the others that are pulled DowN by the ULN inputs.  Can you show me your code?

[brittio]

' {$STAMP BS1}
' {$PBASIC 1.0}

'-------------constants-------------
SYMBOL  on               = 1

SYMBOL  off              = 0

'-------------i/o def------------
SYMBOL  num1            = PIN0          ' leds

SYMBOL  num2            = PIN1

SYMBOL  num3            = PIN2

SYMBOL  num4            = PIN3

SYMBOL  num5            = PIN4

SYMBOL  num6            = PIN5

SYMBOL  num7            = PIN6

SYMBOL  num8            = PIN7

SYMBOL  pntr            = B5            ' pointer

setup:
  pntr = 0

'-------------initialize prop------------
Reset:
  DIRS = %00111111
  DEBUG CLS, "reset"
  pntr = 0
  num1 = on
  num2 = on
  num3 = on
  num4 = on
  num5 = on
  num6 = on
  num7 = on
  num8 = on

'-------------PROGRAM----------------
Main:

FOR pntr = 0 TO 5
  PAUSE 400
  num8 = off
  num1 = on
  PAUSE 400
  num1 = off
  num2 = on
  PAUSE 400
  num2 = off
  num3 = on
  PAUSE 400
  num3 = off
  num4 = on
  PAUSE 400
  num4 = off
  num5 = on
  PAUSE 400
  num5 = off
  num6 = on
  PAUSE 400
  num6 = off
  num7 = on
  PAUSE 400
  num7 = off
  num8 = on
  PAUSE 400
  num8 = off
NEXT
GOTO reset

[JonnyMac]

Problem solved: If you're going to use that code structure you need to make all pins outputs.  Change this:

  DIRS = %00111111

to:

  DIRS = %11111111

There version in your program is telling P6 and P7 to be inputs which means that the output drivers in the chip are disconnected.


Just a hint: ON is a keyword in PBASIC2 (used in the Prop-2) so you should avoid it -- if you decide to move your program to a Prop-2 this will create a error.  In my programs I use the constants IsOn (1) and IsOff (0).  Code then reads more like English:

  Light = IsOn

[JonnyMac]

BTW... you can simplify your reset section to this:

Reset:
  PINS = %11111111                              ' all on
  DIRS = %11111111                              ' all outputs

  DEBUG CLS, "Reset"

The PINS register lets you write to all outputs at once and you don't need to reset pntr because the FOR-NEXT loop handles that.

[brittio]

AWESOME....  I knew it was something easy.  Thank you for your help.