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config: Fix M300 beeper example. (#4480) 

The M300 example macro now sets the PWM cycle time to generate the requested
frequency. 'scale' did not have the desired effect. Duty cycle is now
fixed at 0.5. All S parameter values less than 1 generate a 1Hz 'tone'
to avoid division-by-zero.

Signed-off-by: Stefan Holst <mail@s-holst.de>
This commit is contained in:
s-holst 2021-07-21 00:00:11 +09:00 committed by GitHub
parent 103dcf27ff
commit c20a830e63
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1 changed files with 2 additions and 4 deletions
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6
config/sample-macros.cfg
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@ -72,9 +72,7 @@ value: 0
shutdown_value: 0
# Disable at emergency shutdown (no PWM would be available anyway).
cycle_time: 0.001
# PWM frequency : 0.001 = 1ms will give a base tone of 1kHz
scale: 1000
# PWM parameter will be in the range of (0-1000 Hz).
# Default PWM frequency : 0.001 = 1ms will give a tone of 1kHz
# Although not pitch perfect.
[gcode_macro M300]
@ -83,7 +81,7 @@ gcode:
{% set S = params.S|default(1000)|int %}
# Use a 10ms duration is P is omitted.
{% set P = params.P|default(100)|int %}
SET_PIN PIN=BEEPER_pin VALUE={S}
SET_PIN PIN=BEEPER_pin VALUE=0.5 CYCLE_TIME={ 1.0/S if S > 0 else 1 }
G4 P{P}
SET_PIN PIN=BEEPER_pin VALUE=0