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PinChangeInt.cpp
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PinChangeInt.cpp
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#include "PinChangeInt.h"
#ifndef LIBCALL_PINCHANGEINT // LIBCALL_PINCHANGEINT ***********************************************
volatile uint8_t PCintPort::curr=0;
#ifndef NO_PIN_NUMBER
volatile uint8_t PCintPort::arduinoPin=0;
#endif
#ifndef NO_PIN_STATE
volatile uint8_t PCintPort::pinState=0;
#endif
#ifdef PINMODE
volatile uint8_t PCintPort::pinmode=0;
volatile uint8_t PCintPort::s_portRisingPins=0;
volatile uint8_t PCintPort::s_portFallingPins=0;
volatile uint8_t PCintPort::s_lastPinView=0;
volatile uint8_t PCintPort::s_pmask=0;
volatile char PCintPort::s_PORT='x';
volatile uint8_t PCintPort::s_changedPins=0;
volatile uint8_t PCintPort::s_portRisingPins_nCurr=0;
volatile uint8_t PCintPort::s_portFallingPins_nNCurr=0;
volatile uint8_t PCintPort::s_currXORlastPinView=0;
volatile uint8_t PCintPort::s_count=0;
volatile uint8_t PCintPort::pcint_multi=0;
volatile uint8_t PCintPort::PCIFRbug=0;
#endif
#ifdef FLASH
#define PINLED 13
volatile uint8_t *led_port;
uint8_t led_mask;
uint8_t not_led_mask;
boolean ledsetup_run=false;
void PCintPort::ledsetup(void) {
if (! ledsetup_run) {
led_port=portOutputRegister(digitalPinToPort(PINLED));
led_mask=digitalPinToBitMask(PINLED);
not_led_mask=led_mask^0xFF;
pinMode(PINLED, OUTPUT); digitalWrite(PINLED, LOW);
ledsetup_run=true;
}
};
#endif
//
// ATMEGA 644
//
#if defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644__) // Sanguino, Mosquino uino bobino bonanafannafofino, me my momino...
#ifndef NO_PORTA_PINCHANGES
PCintPort portA=PCintPort(1, 0,PCMSK0); // port PA==1 (from Arduino.h, Arduino version 1.0)
#endif
#ifndef NO_PORTB_PINCHANGES
PCintPort portB=PCintPort(2, 1,PCMSK1); // port PB==2 (from Arduino.h, Arduino version 1.0)
#endif
#ifndef NO_PORTC_PINCHANGES
PCintPort portC=PCintPort(3, 2,PCMSK2); // port PC==3 (also in pins_arduino.c, Arduino version 022)
#endif
#ifndef NO_PORTD_PINCHANGES
PCintPort portD=PCintPort(4, 3,PCMSK3); // port PD==4
#endif
#else // others
#ifndef NO_PORTB_PINCHANGES
PCintPort portB=PCintPort(2, 0,PCMSK0); // port PB==2 (from Arduino.h, Arduino version 1.0)
#endif
#ifndef NO_PORTC_PINCHANGES // note: no PORTC on MEGA
PCintPort portC=PCintPort(3, 1,PCMSK1); // port PC==3 (also in pins_arduino.c, Arduino version 022)
#endif
#ifndef NO_PORTD_PINCHANGES // note: no PORTD on MEGA
PCintPort portD=PCintPort(4, 2,PCMSK2); // port PD==4
#endif
#endif // defined __AVR_ATmega644__
#ifdef __USE_PORT_JK
#ifndef NO_PORTJ_PINCHANGES
PCintPort portJ=PCintPort(10,1,PCMSK1); // port PJ==10
#endif
#ifndef NO_PORTK_PINCHANGES
PCintPort portK=PCintPort(11,2,PCMSK2); // port PK==11
#endif
#endif // USE_PORT_JK
static PCintPort *lookupPortNumToPort( int portNum ) {
PCintPort *port = NULL;
switch (portNum) {
#ifndef NO_PORTA_PINCHANGES
case 1:
port=&portA;
break;
#endif
#ifndef NO_PORTB_PINCHANGES
case 2:
port=&portB;
break;
#endif
#ifndef NO_PORTC_PINCHANGES
case 3:
port=&portC;
break;
#endif
#ifndef NO_PORTD_PINCHANGES
case 4:
port=&portD;
break;
#endif
#ifdef __USE_PORT_JK
#ifndef NO_PORTJ_PINCHANGES
case 10:
port=&portJ;
break;
#endif
#ifndef NO_PORTK_PINCHANGES
case 11:
port=&portK;
break;
#endif
#endif // __USE_PORT_JK
}
return port;
}
void PCintPort::enable(PCintPin* p, PCIntvoidFuncPtr userFunc, uint8_t mode) {
// Enable the pin for interrupts by adding to the PCMSKx register.
// ...The final steps; at this point the interrupt is enabled on this pin.
p->mode=mode;
p->PCintFunc=userFunc;
#ifndef NO_PORTJ_PINCHANGES
// A big shout out to jrhelbert for this fix! Thanks!!!
if ((p->arduinoPin == 14) || (p->arduinoPin == 15)) {
portPCMask |= (p->mask << 1); // PORTJ's PCMSK1 is a little odd...
}
else {
portPCMask |= p->mask;
}
#else
portPCMask |= p->mask;
#endif
if ((p->mode == RISING) || (p->mode == CHANGE)) portRisingPins |= p->mask;
if ((p->mode == FALLING) || (p->mode == CHANGE)) portFallingPins |= p->mask;
PCICR |= PCICRbit;
}
int8_t PCintPort::addPin(uint8_t arduinoPin, PCIntvoidFuncPtr userFunc, uint8_t mode)
{
PCintPin* tmp;
tmp=firstPin;
// Add to linked list, starting with firstPin. If pin already exists, just enable.
if (firstPin != NULL) {
do {
if (tmp->arduinoPin == arduinoPin) { enable(tmp, userFunc, mode); return(0); }
if (tmp->next == NULL) break;
tmp=tmp->next;
} while (true);
}
// Create pin p: fill in the data.
PCintPin* p=new PCintPin;
if (p == NULL) return(-1);
p->arduinoPin=arduinoPin;
p->mode = mode;
p->next=NULL;
p->mask = digitalPinToBitMask(arduinoPin); // the mask
if (firstPin == NULL) firstPin=p;
else tmp->next=p; // NOTE that tmp cannot be NULL.
#ifdef DEBUG
Serial.print("addPin. pin given: "); Serial.print(arduinoPin, DEC);
int addr = (int) p;
Serial.print(" instance addr: "); Serial.println(addr, HEX);
Serial.print("userFunc addr: "); Serial.println((int)p->PCintFunc, HEX);
#endif
enable(p, userFunc, mode);
#ifdef DEBUG
Serial.print("addPin. pin given: "); Serial.print(arduinoPin, DEC), Serial.print (" pin stored: ");
int addr = (int) p;
Serial.print(" instance addr: "); Serial.println(addr, HEX);
#endif
return(1);
}
/*
* attach an interrupt to a specific pin using pin change interrupts.
*/
int8_t PCintPort::attachInterrupt(uint8_t arduinoPin, PCIntvoidFuncPtr userFunc, int mode)
{
PCintPort *port;
uint8_t portNum = digitalPinToPort(arduinoPin);
if ((portNum == NOT_A_PORT) || (userFunc == NULL)) return(-1);
port=lookupPortNumToPort(portNum);
// Added by GreyGnome... must set the initial value of lastPinView for it to be correct on the 1st interrupt.
// ...but even then, how do you define "correct"? Ultimately, the user must specify (not provisioned for yet).
port->lastPinView=port->portInputReg;
#ifdef DEBUG
Serial.print("attachInterrupt- pin: "); Serial.println(arduinoPin, DEC);
#endif
// map pin to PCIR register
return(port->addPin(arduinoPin,userFunc,mode));
}
void PCintPort::detachInterrupt(uint8_t arduinoPin)
{
PCintPort *port;
PCintPin* current;
uint8_t mask;
uint8_t portNum = digitalPinToPort(arduinoPin);
if (portNum == NOT_A_PORT) return;
port=lookupPortNumToPort(portNum);
mask=digitalPinToBitMask(arduinoPin);
current=port->firstPin;
while (current) {
if (current->mask == mask) { // found the target
uint8_t oldSREG = SREG;
cli(); // disable interrupts
#ifndef NO_PORTJ_PINCHANGES
// A big shout out to jrhelbert for this fix! Thanks!!!
if ((arduinoPin == 14) || (arduinoPin == 15)) {
port->portPCMask &= ~(mask << 1); // PORTJ's PCMSK1 is a little odd...
}
else {
port->portPCMask &= ~mask; // disable the mask entry.
}
#else
port->portPCMask &= ~mask; // disable the mask entry.
#endif
if (port->portPCMask == 0) PCICR &= ~(port->PCICRbit);
port->portRisingPins &= ~current->mask; port->portFallingPins &= ~current->mask;
// TODO: This is removed until we can add code that frees memory.
// Note that in the addPin() function, above, we do not define a new pin if it was
// once already defined.
// ... ...
// Link the previous' next to the found next. Then remove the found.
//if (prev != NULL) prev->next=current->next; // linked list skips over current.
//else firstPin=current->next; // at the first pin; save the new first pin
SREG = oldSREG; // Restore register; reenables interrupts
return;
}
current=current->next;
}
}
// common code for isr handler. "port" is the PCINT number.
// there isn't really a good way to back-map ports and masks to pins.
void PCintPort::PCint() {
#ifdef FLASH
if (*led_port & led_mask) *led_port&=not_led_mask;
else *led_port|=led_mask;
#endif
#ifndef DISABLE_PCINT_MULTI_SERVICE
uint8_t pcifr;
while (true) {
#endif
// get the pin states for the indicated port.
#ifdef PINMODE
PCintPort::s_lastPinView=lastPinView;
intrCount++;
PCintPort::s_count=intrCount;
#endif
uint8_t changedPins = (PCintPort::curr ^ lastPinView) &
((portRisingPins & PCintPort::curr ) | ( portFallingPins & ~PCintPort::curr ));
#ifdef PINMODE
PCintPort::s_currXORlastPinView=PCintPort::curr ^ lastPinView;
PCintPort::s_portRisingPins_nCurr=portRisingPins & PCintPort::curr;
PCintPort::s_portFallingPins_nNCurr=portFallingPins & ~PCintPort::curr;
#endif
lastPinView = PCintPort::curr;
PCintPin* p = firstPin;
while (p) {
// Trigger interrupt if the bit is high and it's set to trigger on mode RISING or CHANGE
// Trigger interrupt if the bit is low and it's set to trigger on mode FALLING or CHANGE
if (p->mask & changedPins) {
#ifndef NO_PIN_STATE
PCintPort::pinState=PCintPort::curr & p->mask ? HIGH : LOW;
#endif
#ifndef NO_PIN_NUMBER
PCintPort::arduinoPin=p->arduinoPin;
#endif
#ifdef PINMODE
PCintPort::pinmode=p->mode;
PCintPort::s_portRisingPins=portRisingPins;
PCintPort::s_portFallingPins=portFallingPins;
PCintPort::s_pmask=p->mask;
PCintPort::s_changedPins=changedPins;
#endif
p->PCintFunc();
}
p=p->next;
}
#ifndef DISABLE_PCINT_MULTI_SERVICE
pcifr = PCIFR & PCICRbit;
if (pcifr == 0) break;
PCIFR |= PCICRbit;
#ifdef PINMODE
PCintPort::pcint_multi++;
if (PCIFR & PCICRbit) PCintPort::PCIFRbug=1; // PCIFR & PCICRbit should ALWAYS be 0 here!
#endif
PCintPort::curr=portInputReg;
}
#endif
}
#ifndef NO_PORTA_PINCHANGES
ISR(PCINT0_vect) {
#ifdef PINMODE
PCintPort::s_PORT='A';
#endif
PCintPort::curr = portA.portInputReg;
portA.PCint();
}
#define PORTBVECT PCINT1_vect
#define PORTCVECT PCINT2_vect
#define PORTDVECT PCINT3_vect
#else
#define PORTBVECT PCINT0_vect
#define PORTCVECT PCINT1_vect
#define PORTDVECT PCINT2_vect
#endif
#ifndef NO_PORTB_PINCHANGES
ISR(PORTBVECT) {
#ifdef PINMODE
PCintPort::s_PORT='B';
#endif
PCintPort::curr = portB.portInputReg;
portB.PCint();
}
#endif
#ifndef NO_PORTC_PINCHANGES
ISR(PORTCVECT) {
#ifdef PINMODE
PCintPort::s_PORT='C';
#endif
PCintPort::curr = portC.portInputReg;
portC.PCint();
}
#endif
#ifndef NO_PORTD_PINCHANGES
ISR(PORTDVECT){
#ifdef PINMODE
PCintPort::s_PORT='D';
#endif
PCintPort::curr = portD.portInputReg;
portD.PCint();
}
#endif
#ifdef __USE_PORT_JK
#ifndef NO_PORTJ_PINCHANGES
ISR(PCINT1_vect) {
#ifdef PINMODE
PCintPort::s_PORT='J';
#endif
PCintPort::curr = portJ.portInputReg;
portJ.PCint();
}
#endif
#ifndef NO_PORTK_PINCHANGES
ISR(PCINT2_vect){
#ifdef PINMODE
PCintPort::s_PORT='K';
#endif
PCintPort::curr = portK.portInputReg;
portK.PCint();
}
#endif
#endif // __USE_PORT_JK
#ifdef GET_PCINT_VERSION
uint16_t getPCIntVersion () {
return ((uint16_t) PCINT_VERSION);
}
#endif // GET_PCINT_VERSION
#endif // #ifndef LIBCALL_PINCHANGEINT *************************************************************