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Commitf2d83ba

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allow to set pin to OUTPUT_OPEN_DRAIN in analogWriteMode (#7841)
* allow to set pin to OUTPUT_OPEN_DRAIN in analogWrite* remove parameter with default value* Update core_esp8266_wiring_pwm.cpp* update documentation accordingly
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‎cores/esp8266/Arduino.h‎

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@@ -171,6 +171,7 @@ int digitalRead(uint8_t pin);
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intanalogRead(uint8_t pin);
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voidanalogReference(uint8_t mode);
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voidanalogWrite(uint8_t pin,int val);
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voidanalogWriteMode(uint8_t pin,int val,bool openDrain);
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voidanalogWriteFreq(uint32_t freq);
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voidanalogWriteResolution(int res);
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voidanalogWriteRange(uint32_t range);

‎cores/esp8266/core_esp8266_wiring_pwm.cpp‎

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@@ -44,6 +44,10 @@ extern void __analogWriteFreq(uint32_t freq) {
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}
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externvoid__analogWrite(uint8_t pin,int val) {
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analogWriteMode(pin, val,false);
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}
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externvoid__analogWriteMode(uint8_t pin,int val,bool openDrain) {
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if (pin >16) {
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return;
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}
@@ -62,7 +66,11 @@ extern void __analogWrite(uint8_t pin, int val) {
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analogMap &= ~(1 << pin);
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}
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else {
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pinMode(pin, OUTPUT);
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if(openDrain) {
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pinMode(pin, OUTPUT_OPEN_DRAIN);
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}else {
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pinMode(pin, OUTPUT);
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}
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}
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uint32_t high = (analogPeriod * val) / analogScale;
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uint32_t low = analogPeriod - high;
@@ -88,6 +96,7 @@ extern void __analogWriteResolution(int res) {
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}
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externvoidanalogWrite(uint8_t pin,int val) __attribute__((weak, alias("__analogWrite")));
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externvoidanalogWriteMode(uint8_t pin,int val,bool openDrain) __attribute__((weak, alias("__analogWriteMode")));
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externvoidanalogWriteFreq(uint32_t freq) __attribute__((weak, alias("__analogWriteFreq")));
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externvoidanalogWriteRange(uint32_t range) __attribute__((weak, alias("__analogWriteRange")));
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externvoidanalogWriteResolution(int res) __attribute__((weak, alias("__analogWriteResolution")));

‎doc/reference.rst‎

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

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