88 lines
3 KiB
C
88 lines
3 KiB
C
/**
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* Marlin 3D Printer Firmware
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* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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* Copyright (C) 2017 Victor Perez
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* Endstop interrupts for Libmaple STM32F1 based targets.
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*
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* On STM32F, all pins support external interrupt capability.
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* Any pin can be used for external interrupts, but there are some restrictions.
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* At most 16 different external interrupts can be used at one time.
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* Further, you can’t just pick any 16 pins to use. This is because every pin on the STM32
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* connects to what is called an EXTI line, and only one pin per EXTI line can be used for external interrupts at a time
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* Check the Reference Manual of the MCU to confirm which line is used by each pin
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*/
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/**
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* Endstop Interrupts
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*
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* Without endstop interrupts the endstop pins must be polled continually in
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* the temperature-ISR via endstops.update(), most of the time finding no change.
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* With this feature endstops.update() is called only when we know that at
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* least one endstop has changed state, saving valuable CPU cycles.
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*
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* This feature only works when all used endstop pins can generate an 'external interrupt'.
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*
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* Test whether pins issue interrupts on your board by flashing 'pin_interrupt_test.ino'.
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* (Located in Marlin/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino)
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*/
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#ifndef _ENDSTOP_INTERRUPTS_H_
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#define _ENDSTOP_INTERRUPTS_H_
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#include "../../module/endstops.h"
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// One ISR for all EXT-Interrupts
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void endstop_ISR(void) { endstops.update(); }
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void setup_endstop_interrupts(void) {
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#if HAS_X_MAX
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attachInterrupt(X_MAX_PIN, endstop_ISR, CHANGE); // assign it
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#endif
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#if HAS_X_MIN
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attachInterrupt(X_MIN_PIN, endstop_ISR, CHANGE);
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#endif
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#if HAS_Y_MAX
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attachInterrupt(Y_MAX_PIN, endstop_ISR, CHANGE);
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#endif
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#if HAS_Y_MIN
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attachInterrupt(Y_MIN_PIN, endstop_ISR, CHANGE);
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#endif
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#if HAS_Z_MAX
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attachInterrupt(Z_MAX_PIN, endstop_ISR, CHANGE);
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#endif
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#if HAS_Z_MIN
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attachInterrupt(Z_MIN_PIN, endstop_ISR, CHANGE);
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#endif
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#if HAS_Z2_MAX
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attachInterrupt(Z2_MAX_PIN, endstop_ISR, CHANGE);
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#endif
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#if HAS_Z2_MIN
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attachInterrupt(Z2_MIN_PIN, endstop_ISR, CHANGE);
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#endif
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#if HAS_Z_MIN_PROBE_PIN
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attachInterrupt(Z_MIN_PROBE_PIN, endstop_ISR, CHANGE);
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#endif
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}
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#endif //_ENDSTOP_INTERRUPTS_H_
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