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141 lines
4.8 KiB
141 lines
4.8 KiB
/**
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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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*
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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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* Fast I/O Routines for LPC1768/9
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* Use direct port manipulation to save scads of processor time.
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* Contributed by Triffid_Hunter and modified by Kliment, thinkyhead, Bob-the-Kuhn, et.al.
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*/
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/**
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* Description: Fast IO functions LPC1768
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*
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* For TARGET LPC1768
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*/
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#ifndef _FASTIO_LPC1768_H
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#define _FASTIO_LPC1768_H
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#include <LPC17xx.h>
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#include <Arduino.h>
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#include <pinmapping.h>
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bool useable_hardware_PWM(pin_t pin);
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#define USEABLE_HARDWARE_PWM(pin) useable_hardware_PWM(pin)
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#define LPC_PORT_OFFSET (0x0020)
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#define LPC_PIN(pin) (1UL << pin)
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#define LPC_GPIO(port) ((volatile LPC_GPIO_TypeDef *)(LPC_GPIO0_BASE + LPC_PORT_OFFSET * port))
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#define SET_DIR_INPUT(IO) (LPC_GPIO(LPC1768_PIN_PORT(IO))->FIODIR &= ~LPC_PIN(LPC1768_PIN_PIN(IO)))
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#define SET_DIR_OUTPUT(IO) (LPC_GPIO(LPC1768_PIN_PORT(IO))->FIODIR |= LPC_PIN(LPC1768_PIN_PIN(IO)))
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#define SET_MODE(IO, mode) (pin_mode((LPC1768_PIN_PORT(IO), LPC1768_PIN_PIN(IO)), mode))
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#define WRITE_PIN_SET(IO) (LPC_GPIO(LPC1768_PIN_PORT(IO))->FIOSET = LPC_PIN(LPC1768_PIN_PIN(IO)))
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#define WRITE_PIN_CLR(IO) (LPC_GPIO(LPC1768_PIN_PORT(IO))->FIOCLR = LPC_PIN(LPC1768_PIN_PIN(IO)))
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#define READ_PIN(IO) ((LPC_GPIO(LPC1768_PIN_PORT(IO))->FIOPIN & LPC_PIN(LPC1768_PIN_PIN(IO))) ? 1 : 0)
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#define WRITE_PIN(IO, v) ((v) ? WRITE_PIN_SET(IO) : WRITE_PIN_CLR(IO))
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/**
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* Magic I/O routines
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*
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* Now you can simply SET_OUTPUT(STEP); WRITE(STEP, HIGH); WRITE(STEP, LOW);
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*
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* Why double up on these macros? see http://gcc.gnu.org/onlinedocs/cpp/Stringification.html
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*/
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/// Read a pin
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#define _READ(IO) READ_PIN(IO)
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/// Write to a pin
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#define _WRITE_VAR(IO, v) digitalWrite(IO, v)
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#define _WRITE(IO, v) WRITE_PIN(IO, v)
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/// toggle a pin
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#define _TOGGLE(IO) _WRITE(IO, !READ(IO))
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/// set pin as input
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#define _SET_INPUT(IO) SET_DIR_INPUT(IO)
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/// set pin as output
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#define _SET_OUTPUT(IO) SET_DIR_OUTPUT(IO)
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/// set pin as input with pullup mode
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#define _PULLUP(IO, v) (pinMode(IO, (v!=LOW ? INPUT_PULLUP : INPUT)))
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/// set pin as input with pulldown mode
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#define _PULLDOWN(IO, v) (pinMode(IO, (v!=LOW ? INPUT_PULLDOWN : INPUT)))
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// hg42: all pins can be input or output (I hope)
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// hg42: undefined pins create compile error (IO, is no pin)
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// hg42: currently not used, but was used by pinsDebug
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/// check if pin is an input
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#define _GET_INPUT(IO) (LPC1768_PIN_PIN(IO)>=0)
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/// check if pin is an output
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#define _GET_OUTPUT(IO) (LPC1768_PIN_PIN(IO)>=0)
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// hg42: GET_TIMER is used only to check if it's a PWM pin
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// hg42: we cannot use USEABLE_HARDWARE_PWM because it uses a function that cannot be used statically
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// hg42: instead use PWM bit from the #define
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/// check if pin is an timer
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#define _GET_TIMER(IO) TRUE // could be LPC1768_PIN_PWM(IO), but there
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// hg42: could be this:
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// #define _GET_TIMER(IO) LPC1768_PIN_PWM(IO)
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// but this is an incomplete check (12 pins are PWMable, but only 6 can be used at the same time)
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/// Read a pin wrapper
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#define READ(IO) _READ(IO)
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/// Write to a pin wrapper
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#define WRITE_VAR(IO, v) _WRITE_VAR(IO, v)
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#define WRITE(IO, v) _WRITE(IO, v)
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/// toggle a pin wrapper
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#define TOGGLE(IO) _TOGGLE(IO)
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/// set pin as input wrapper
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#define SET_INPUT(IO) _SET_INPUT(IO)
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/// set pin as input with pullup wrapper
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#define SET_INPUT_PULLUP(IO) do{ _SET_INPUT(IO); _PULLUP(IO, HIGH); }while(0)
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/// set pin as input with pulldown wrapper
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#define SET_INPUT_PULLDOWN(IO) do{ _SET_INPUT(IO); _PULLDOWN(IO, HIGH); }while(0)
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/// set pin as output wrapper - reads the pin and sets the output to that value
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#define SET_OUTPUT(IO) do{ _WRITE(IO, _READ(IO)); _SET_OUTPUT(IO); }while(0)
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/// check if pin is an input wrapper
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#define GET_INPUT(IO) _GET_INPUT(IO)
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/// check if pin is an output wrapper
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#define GET_OUTPUT(IO) _GET_OUTPUT(IO)
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/// check if pin is an timer wrapper
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#define GET_TIMER(IO) _GET_TIMER(IO)
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// Shorthand
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#define OUT_WRITE(IO, v) { SET_OUTPUT(IO); WRITE(IO, v); }
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#endif // _FASTIO_LPC1768_H
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