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🚸 Prevent M42 unintended pin change to output (#22493)

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This commit is contained in:
Tanguy Pruvot 2021-08-05 06:47:31 +02:00 committed by Scott Lahteine
parent b567717762
commit 0af762d609
1 changed files with 32 additions and 4 deletions
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36
Marlin/src/gcode/control/M42.cpp
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@ -31,6 +31,13 @@
#include "../../module/temperature.h"
#endif
#ifdef MAPLE_STM32F1
// these are enums on the F1...
#define INPUT_PULLDOWN INPUT_PULLDOWN
#define INPUT_ANALOG INPUT_ANALOG
#define OUTPUT_OPEN_DRAIN OUTPUT_OPEN_DRAIN
#endif
void protected_pin_err() {
SERIAL_ERROR_MSG(STR_ERR_PROTECTED_PIN);
}
@ -55,13 +62,20 @@ void GcodeSuite::M42() {
if (!parser.boolval('I') && pin_is_protected(pin)) return protected_pin_err();
bool avoidWrite = false;
if (parser.seenval('M')) {
switch (parser.value_byte()) {
case 0: pinMode(pin, INPUT); break;
case 0: pinMode(pin, INPUT); avoidWrite = true; break;
case 1: pinMode(pin, OUTPUT); break;
case 2: pinMode(pin, INPUT_PULLUP); break;
case 2: pinMode(pin, INPUT_PULLUP); avoidWrite = true; break;
#ifdef INPUT_PULLDOWN
case 3: pinMode(pin, INPUT_PULLDOWN); break;
case 3: pinMode(pin, INPUT_PULLDOWN); avoidWrite = true; break;
#endif
#ifdef INPUT_ANALOG
case 4: pinMode(pin, INPUT_ANALOG); avoidWrite = true; break;
#endif
#ifdef OUTPUT_OPEN_DRAIN
case 5: pinMode(pin, OUTPUT_OPEN_DRAIN); break;
#endif
default: SERIAL_ECHOLNPGM("Invalid Pin Mode"); return;
}
@ -99,8 +113,22 @@ void GcodeSuite::M42() {
}
#endif
pinMode(pin, OUTPUT);
if (avoidWrite) {
SERIAL_ECHOLNPGM("?Cannot write to INPUT");
return;
}
// An OUTPUT_OPEN_DRAIN should not be changed to normal OUTPUT (STM32)
// Use M42 Px M1/5 S0/1 to set the output type and then set value
#ifndef OUTPUT_OPEN_DRAIN
pinMode(pin, OUTPUT);
#endif
extDigitalWrite(pin, pin_status);
#ifdef ARDUINO_ARCH_STM32
// A simple I/O will be set to 0 by analogWrite()
if (pin_status <= 1) return;
#endif
analogWrite(pin, pin_status);
}