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- /**
- * Copyright (c) 2011-2012 Arduino. All right reserved.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
- #ifdef TARGET_LPC1768
-
- #include "../../inc/MarlinConfig.h"
- #include <Arduino.h>
- #include <pinmapping.h>
- //#include "HAL_timers.h"
- #include "fastio.h"
-
- #define GNUM 31
-
- typedef void (*interruptCB)(void);
-
- static interruptCB callbacksP0[GNUM];
- static interruptCB callbacksP2[GNUM];
-
- extern "C" void GpioEnableInt(const uint32_t port, const uint32_t pin, const uint32_t mode);
- extern "C" void GpioDisableInt(const uint32_t port, const uint32_t pin);
-
- //void deadloop(void) {}
-
- /* Configure PIO interrupt sources */
- static void __initialize() {
- for (uint8_t i = 0; i < GNUM; i++) {
- callbacksP0[i] = 0;
- callbacksP2[i] = 0;
- }
- NVIC_EnableIRQ(EINT3_IRQn);
- }
-
- void attachInterrupt(const pin_t pin, void (*callback)(void), uint32_t mode) {
- static int enabled = 0;
-
- if (!INTERRUPT_PIN(pin)) return;
-
- if (!enabled) {
- __initialize();
- ++enabled;
- }
- uint8_t myport = LPC1768_PIN_PORT(pin),
- mypin = LPC1768_PIN_PIN(pin);
-
- if (myport == 0)
- callbacksP0[mypin] = callback;
- else
- callbacksP2[mypin] = callback;
-
- // Enable interrupt
- GpioEnableInt(myport,mypin,mode);
- }
-
- void detachInterrupt(const pin_t pin) {
- if (!INTERRUPT_PIN(pin)) return;
-
- const uint8_t myport = LPC1768_PIN_PORT(pin),
- mypin = LPC1768_PIN_PIN(pin);
-
- // Disable interrupt
- GpioDisableInt(myport, mypin);
-
- // unset callback
- if (myport == 0)
- callbacksP0[mypin] = 0;
- else //if (myport == 2 )
- callbacksP2[mypin] = 0;
- }
-
-
- extern "C" void GpioEnableInt(uint32_t port, uint32_t pin, uint32_t mode) {
- //pin here is the processor pin, not logical pin
- if (port == 0) {
- LPC_GPIOINT->IO0IntClr = _BV(pin);
- if (mode == RISING) {
- SBI(LPC_GPIOINT->IO0IntEnR, pin);
- CBI(LPC_GPIOINT->IO0IntEnF, pin);
- }
- else if (mode == FALLING) {
- SBI(LPC_GPIOINT->IO0IntEnF, pin);
- CBI(LPC_GPIOINT->IO0IntEnR, pin);
- }
- else if (mode == CHANGE) {
- SBI(LPC_GPIOINT->IO0IntEnR, pin);
- SBI(LPC_GPIOINT->IO0IntEnF, pin);
- }
- }
- else {
- LPC_GPIOINT->IO2IntClr = _BV(pin);
- if (mode == RISING) {
- SBI(LPC_GPIOINT->IO2IntEnR, pin);
- CBI(LPC_GPIOINT->IO2IntEnF, pin);
- }
- else if (mode == FALLING) {
- SBI(LPC_GPIOINT->IO2IntEnF, pin);
- CBI(LPC_GPIOINT->IO2IntEnR, pin);
- }
- else if (mode == CHANGE) {
- SBI(LPC_GPIOINT->IO2IntEnR, pin);
- SBI(LPC_GPIOINT->IO2IntEnF, pin);
- }
- }
- }
-
- extern "C" void GpioDisableInt(const uint32_t port, const uint32_t pin) {
- if (port == 0) {
- CBI(LPC_GPIOINT->IO0IntEnR, pin);
- CBI(LPC_GPIOINT->IO0IntEnF, pin);
- LPC_GPIOINT->IO0IntClr = _BV(pin);
- }
- else {
- CBI(LPC_GPIOINT->IO2IntEnR, pin);
- CBI(LPC_GPIOINT->IO2IntEnF, pin);
- LPC_GPIOINT->IO2IntClr = _BV(pin);
- }
- }
-
- constexpr bool isPowerOf2(const uint16_t n) {
- return IS_POWER_OF_2(n);
- }
-
- #if 0
- extern "C" void EINT3_IRQHandler () {
- LPC_GPIOINT->IO0IntClr = LPC_GPIOINT->IO2IntClr = 0xFFFFFFFF;
- TOGGLE(13);
- //NVIC_ClearPendingIRQ(EINT3_IRQn);
- }
- #else
-
- extern "C" void EINT3_IRQHandler(void) {
- // Read in all current interrupt registers. We do this once as the
- // GPIO interrupt registers are on the APB bus, and this is slow.
- uint32_t rise0 = LPC_GPIOINT->IO0IntStatR,
- fall0 = LPC_GPIOINT->IO0IntStatF,
- rise2 = LPC_GPIOINT->IO2IntStatR,
- fall2 = LPC_GPIOINT->IO2IntStatF;
- // Clear the interrupts ASAP
- LPC_GPIOINT->IO0IntClr = LPC_GPIOINT->IO2IntClr = 0xFFFFFFFF;
- NVIC_ClearPendingIRQ(EINT3_IRQn);
-
- /* multiple pins changes happened.*/
- if (rise0) while (rise0 > 0) { // Continue as long as there are interrupts pending
- const uint8_t bitloc = 31 - __CLZ(rise0); //CLZ returns number of leading zeros, 31 minus that is location of first pending interrupt
- if (callbacksP0[bitloc] != NULL) callbacksP0[bitloc]();
- rise0 -= _BV(bitloc);
- }
-
- if (fall0) while (fall0 > 0) {
- const uint8_t bitloc = 31 - __CLZ(fall0);
- if (callbacksP0[bitloc] != NULL) callbacksP0[bitloc]();
- fall0 -= _BV(bitloc);
- }
-
- if (rise2) while(rise2 > 0) {
- const uint8_t bitloc = 31 - __CLZ(rise2);
- if (callbacksP2[bitloc] != NULL) callbacksP2[bitloc]();
- //LPC_GPIOINT->IO2IntClr = 1 << bitloc;
- rise2 -= _BV(bitloc);
- }
-
- if (fall2) while (fall2 > 0) {
- const uint8_t bitloc = 31 - __CLZ(fall2);
- if (callbacksP2[bitloc] != NULL) callbacksP2[bitloc]();
- //LPC_GPIOINT->IO2IntClr = 1 << bitloc;
- fall2 -= _BV(bitloc);
- }
- //NVIC_ClearPendingIRQ(EINT3_IRQn);
- //LPC_GPIOINT->IO0IntClr = LPC_GPIOINT->IO2IntClr = 0xFFFFFFFF;
- //NVIC_ClearPendingIRQ(EINT3_IRQn);
- }
-
- #endif
-
- #endif // TARGET_LPC1768
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