Repeat Blink LED Group

Goal: Make a group of LED’s simultaneously blink in a continuous loop.

Purpose: This will demonstrate the use of the “dira” to set pin to an output state, and then use “outa” to turn on the group of LED’s.

Clock frequency: 5,000 Hz

Propeller code type: This propeller code is based on spin language only.

Files to download: (right click)

demo_repeat_blink_led_group

Pics to Download: (click to enlarge)

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{{
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*    demo_repeat_blink_led_group   *
*       2008                       *
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Goal: Make a group of LED's simultaneously blink in a continuous loop.

Purpose: This will demonstrate the use of the "dira" to set pin to an output state,
and then use "outa" to turn on the group of LED's.
}}

CON

_clkmode     = xtal1 + pll16x   'Feedback and PLL multiplier
_xinfreq     = 5_000_000        'External oscillator = 5 MHz

pinLEDstart       = 0           'assign which pin the first led in the group is on
pinLEDend         = 2           'assign which pin the last led in the group is on
' (you can have as many LED's in your group as your group as you want as long as
you don't exceed the maximum current of 30 mA.)

PUB Blinker                     'Main method

dira[pinLEDstart..pinLEDend]~~  'Set pin to output (~ sets I/O to input
and ~~ sets I/O to output, all pins default to input state)

repeat                          'Endless loop

!outa[pinLEDstart..pinLEDend]   'toggles output of the group of pins low/high (if low,
then high, or if high, then low)

waitcnt(clkfreq / 4 + cnt) 'Wait 1/4 second -> 2 Hz(uses the clock frequency of 5 MHz)