Goal: Make a speaker output sound.
Purpose: This will demonstrate simple frequency generation by sending pulses at a constant rate.
Clock frequency: 5,000 Hz
Propeller code type: This propeller code is based on spin language only.
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{{
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* demo_speaker_single_freq *
* 2008 *
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Goal: Make a speaker output sound.
Purpose: This will demonstrate simple frequency generation by
sending pulses at a constant rate.
}}
CON
_clkmode = xtal1 + pll16x ' Feedback and PLL multiplier
_xinfreq = 5_000_000 ' External oscillator = 5 MHz
pinSpeaker = 0 ' assign which pin the led is on
PUB FreqGen ' Main method
dira[pinSpeaker]~~ ' 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[pinSpeaker] 'toggles output of pin 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)