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MarlinFirmware/Marlin/src/HAL/HAL_LPC1768/WInterrupts.cpp

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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"
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#include "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];
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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() {
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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) {
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static int enabled = 0;
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if (!INTERRUPT_PIN(pin)) return;
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if (!enabled) {
__initialize();
++enabled;
}
uint8_t myport = LPC1768_PIN_PORT(pin),
mypin = LPC1768_PIN_PIN(pin);
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if (myport == 0)
callbacksP0[mypin] = callback;
else
callbacksP2[mypin] = callback;
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// Enable interrupt
GpioEnableInt(myport,mypin,mode);
}
void detachInterrupt(const pin_t pin) {
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if (!INTERRUPT_PIN(pin)) return;
const uint8_t myport = LPC1768_PIN_PORT(pin),
mypin = LPC1768_PIN_PIN(pin);
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// Disable interrupt
GpioDisableInt(myport, mypin);
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// unset callback
if (myport == 0)
callbacksP0[mypin] = 0;
else //if (myport == 2 )
callbacksP2[mypin] = 0;
}
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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);
}
}
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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);
}
}
}
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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);
}
}
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bool isPowerOf2(unsigned int n) {
return n == 1 || (n & (n - 1)) == 0;
}
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#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