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allow to set pin to OUTPUT_OPEN_DRAIN in analogWriteMode (#7841)

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* allow to set pin to OUTPUT_OPEN_DRAIN in analogWrite

* remove parameter with default value

* Update core_esp8266_wiring_pwm.cpp

* update documentation accordingly
This commit is contained in:
Michael Kluge 2021-01-27 08:56:43 +01:00 committed by GitHub
parent 53e5688453
commit f2d83ba43d
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3 changed files with 14 additions and 1 deletions
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1
cores/esp8266/Arduino.h
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@ -171,6 +171,7 @@ int digitalRead(uint8_t pin);
int analogRead(uint8_t pin); int analogRead(uint8_t pin);
void analogReference(uint8_t mode); void analogReference(uint8_t mode);
void analogWrite(uint8_t pin, int val); void analogWrite(uint8_t pin, int val);
void analogWriteMode(uint8_t pin, int val, bool openDrain);
void analogWriteFreq(uint32_t freq); void analogWriteFreq(uint32_t freq);
void analogWriteResolution(int res); void analogWriteResolution(int res);
void analogWriteRange(uint32_t range); void analogWriteRange(uint32_t range);

11
cores/esp8266/core_esp8266_wiring_pwm.cpp
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@ -44,6 +44,10 @@ extern void __analogWriteFreq(uint32_t freq) {
} }
extern void __analogWrite(uint8_t pin, int val) { extern void __analogWrite(uint8_t pin, int val) {
analogWriteMode(pin, val, false);
}
extern void __analogWriteMode(uint8_t pin, int val, bool openDrain) {
if (pin > 16) { if (pin > 16) {
return; return;
} }
@ -62,7 +66,11 @@ extern void __analogWrite(uint8_t pin, int val) {
analogMap &= ~(1 << pin); analogMap &= ~(1 << pin);
} }
else { else {
pinMode(pin, OUTPUT); if(openDrain) {
pinMode(pin, OUTPUT_OPEN_DRAIN);
} else {
pinMode(pin, OUTPUT);
}
} }
uint32_t high = (analogPeriod * val) / analogScale; uint32_t high = (analogPeriod * val) / analogScale;
uint32_t low = analogPeriod - high; uint32_t low = analogPeriod - high;
@ -88,6 +96,7 @@ extern void __analogWriteResolution(int res) {
} }
extern void analogWrite(uint8_t pin, int val) __attribute__((weak, alias("__analogWrite"))); extern void analogWrite(uint8_t pin, int val) __attribute__((weak, alias("__analogWrite")));
extern void analogWriteMode(uint8_t pin, int val, bool openDrain) __attribute__((weak, alias("__analogWriteMode")));
extern void analogWriteFreq(uint32_t freq) __attribute__((weak, alias("__analogWriteFreq"))); extern void analogWriteFreq(uint32_t freq) __attribute__((weak, alias("__analogWriteFreq")));
extern void analogWriteRange(uint32_t range) __attribute__((weak, alias("__analogWriteRange"))); extern void analogWriteRange(uint32_t range) __attribute__((weak, alias("__analogWriteRange")));
extern void analogWriteResolution(int res) __attribute__((weak, alias("__analogWriteResolution"))); extern void analogWriteResolution(int res) __attribute__((weak, alias("__analogWriteResolution")));

3
doc/reference.rst
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@ -109,6 +109,9 @@ PWM range may be changed by calling ``analogWriteRange(new_range)`` or
``analogWriteResolution(bits)``. ``new_range`` may be from 15...65535 ``analogWriteResolution(bits)``. ``new_range`` may be from 15...65535
or ``bits`` may be from 4...16. or ``bits`` may be from 4...16.
The function ``analogWriteMode(pin, value, openDrain)`` allows to sets
the pin mode to ``OUTPUT_OPEN_DRAIN`` instead of ``OUTPUT``.
**NOTE:** The default ``analogWrite`` range was 1023 in releases before **NOTE:** The default ``analogWrite`` range was 1023 in releases before
3.0, but this lead to incompatibility with external libraries which 3.0, but this lead to incompatibility with external libraries which
depended on the Arduino core default of 256. Existing applications which depended on the Arduino core default of 256. Existing applications which