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Allow specifying waveform generator in source code (#7800)

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* Allow specifying waveform generator in source code

Allows code to explicitly specify which waveform generator it wants,
without needing to use one of the 100 IDE menus or adding a `-D`
compile-time define.

Uses weakrefs to allow for apps to call `enablePhaseLockedWaveform();`
within their `setup()` (or anywhere, really) and have the phase locked
versions override the default waveform generators automatically.

For example:

````
void setup() {
  // Uncomment following line to use phase-locked waveform generator
  // enablePhaseLockedWaveform();
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);     // Initialize the LED_BUILTIN pin as an output
  analogWriteRange(1000);
}
void loop() {
  analogWrite(LED_BUILTIN, 100);
  delay(1000);                      // Wait for a second
  analogWrite(LED_BUILTIN, 900);
  delay(2000);                      // Wait for two seconds (to demonstrate the active low LED)
}
````

Also adds an example showing it's use.

Address @dok-net's comments and also remove the _weak/_bound version of
startWaveform() since it's invariant of the actual waveform generator.
This commit is contained in:
Earle F. Philhower, III
2021-01-17 15:57:26 -08:00
committed by GitHub
parent a4b6003c2e
commit f5fd5912fe
14 changed files with 283 additions and 413 deletions
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6
tests/common.sh
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@ -70,8 +70,6 @@ function build_sketches()
local sketches=$(find $srcpath -name *.ino | sort)
print_size_info >size.log
export ARDUINO_IDE_PATH=$arduino
local pwm_phase=""
[ $(( $build_rem % 2 )) -eq 0 ] && pwm_phase="--waveform_phase"
local testcnt=0
for sketch in $sketches; do
testcnt=$(( ($testcnt + 1) % $build_mod ))
@ -119,8 +117,8 @@ function build_sketches()
export MSYS2_ARG_CONV_EXC="*"
export MSYS_NO_PATHCONV=1
fi
echo "$build_cmd $pwm_phase $sketch"
time ($build_cmd $pwm_phase $sketch >build.log)
echo "$build_cmd $sketch"
time ($build_cmd $sketch >build.log)
local result=$?
if [ $result -ne 0 ]; then
echo "Build failed ($1)"