Hi,i have rfid reader with wiegand out it is working good when i upload following code with arduino uno...but when i upload it using arduino mega2560 its not working...i found that different pin mapping and port registers for uno and mega2560...how can i convert this to the mega compatible code?
This is my code:
/* Crazy People
By Mike Cook April 2009
Three RFID readers outputing 26 bit Wiegand code to pins:-
Reader A (Head) Pins 4 & 5
Reader B (Body) Pins 6 & 7
Reader C (Legs) Pins 8 & 9
Interrupt service routine gathers Wiegand pulses (zero or one) until 26 have been recieved
Then a sting is sent to processing
*/
#include "pins_arduino.h"
/*
an extension to the interrupt support for arduino.
add pin change interrupts to the external interrupts, giving a way
for users to have interrupts drive off of any pin.
Refer to avr-gcc header files, arduino source and atmega datasheet.
*/
/*
Theory: all IO pins on Atmega168 are covered by Pin Change Interrupts.
The PCINT corresponding to the pin must be enabled and masked, and
an ISR routine provided. Since PCINTs are per port, not per pin, the ISR
must use some logic to actually implement a per-pin interrupt service.
*/
/* Pin to interrupt map:
D0-D7 = PCINT 16-23 = PCIR2 = PD = PCIE2 = pcmsk2
D8-D13 = PCINT 0-5 = PCIR0 = PB = PCIE0 = pcmsk0
A0-A5 (D14-D19) = PCINT 8-13 = PCIR1 = PC = PCIE1 = pcmsk1
*/
volatile uint8_t *port_to_pcmask[] = {
&PCMSK0,
&PCMSK1,
&PCMSK2
};
typedef void (*voidFuncPtr)(void);
volatile static voidFuncPtr PCintFunc[24] = {
NULL
};
volatile static uint8_t PCintLast[3];
/*
attach an interrupt to a specific pin using pin change interrupts.
First version only supports CHANGE mode.
*/
void PCattachInterrupt(uint8_t pin, void (*userFunc)(void), int mode) {
uint8_t bit = digitalPinToBitMask(pin);
uint8_t port = digitalPinToPort(pin);
uint8_t slot;
volatile uint8_t *pcmask;
if (mode != CHANGE) {
return;
}
// map pin to PCIR register
if (port == NOT_A_PORT) {
return;
}
else {
port -= 2;
pcmask = port_to_pcmask[port];
}
slot = port * 8 + (pin % 8);
PCintFunc[slot] = userFunc;
// set the mask
*pcmask |= bit;
// enable the interrupt
PCICR |= 0x01 << port;
}
void PCdetachInterrupt(uint8_t pin) {
uint8_t bit = digitalPinToBitMask(pin);
uint8_t port = digitalPinToPort(pin);
volatile uint8_t *pcmask;
// map pin to PCIR register
if (port == NOT_A_PORT) {
return;
}
else {
port -= 2;
pcmask = port_to_pcmask[port];
}
// disable the mask.
*pcmask &= ~bit;
// if that's the last one, disable the interrupt.
if (*pcmask == 0) {
PCICR &= ~(0x01 << port);
}
}
// 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.
static void PCint(uint8_t port) {
uint8_t bit;
uint8_t curr;
uint8_t mask;
uint8_t pin;
// get the pin states for the indicated port.
curr = *portInputRegister(port + 2);
mask = curr ^ PCintLast[port];
PCintLast[port] = curr;
// mask is pins that have changed. screen out non pcint pins.
if ((mask &= *port_to_pcmask[port]) == 0) {
return;
}
// mask is pcint pins that have changed.
for (uint8_t i = 0; i < 8; i++) {
bit = 0x01 << i;
if (bit & mask) {
pin = port * 8 + i;
if (PCintFunc[pin] != NULL) {
PCintFunc[pin]();
}
}
}
}
SIGNAL(PCINT0_vect) {
PCint(0);
}
SIGNAL(PCINT1_vect) {
PCint(1);
}
SIGNAL(PCINT2_vect) {
PCint(2);
}
// End of interrupts code and start of the reader code
volatile long reader1 = 0, reader2 = 0, reader3 = 0;
volatile long ReaderA, Default = 268435455;
volatile int reader1Count = 0, reader2Count = 0, reader3Count = 0;
void reader1One(void) {
if (digitalRead(4) == LOW) {
reader1Count++;
reader1 = reader1 << 1;
reader1 |= 1;
}
}
void reader1Zero(void) {
if (digitalRead(5) == LOW) {
reader1Count++;
reader1 = reader1 << 1;
}
}
void reader2One(void) {
if (digitalRead(6) == LOW) {
reader2Count++;
reader2 = reader2 << 1;
reader2 |= 1;
}
}
void reader2Zero(void) {
if (digitalRead(7) == LOW) {
reader2Count++;
reader2 = reader2 << 1;
}
}
void reader3One(void) {
if (digitalRead(8) == LOW) {
reader3Count++;
reader3 = reader3 << 1;
reader3 |= 1;
}
}
void reader3Zero(void) {
if (digitalRead(9) == LOW) {
reader3Count++;
reader3 = reader3 << 1;
}
}
void setup()
{
Serial.begin(9600);
// Attach pin change interrupt service routines from the Wiegand RFID readers
PCattachInterrupt(4, reader1One, CHANGE);
PCattachInterrupt(5, reader1Zero, CHANGE);
PCattachInterrupt(6, reader2One, CHANGE);
PCattachInterrupt(7, reader2Zero, CHANGE);
PCattachInterrupt(8, reader3One, CHANGE);
PCattachInterrupt(9, reader3Zero, CHANGE);
delay(10);
// the interrupt in the Atmel processor mises out the first negitave pulse as the inputs are already high,
// so this gives a pulse to each reader input line to get the interrupts working properly.
// Then clear out the reader variables.
// The readers are open collector sitting normally at a one so this is OK
for (int i = 4; i < 10; i++) {
pinMode(i, OUTPUT);
digitalWrite(i, HIGH); // enable internal pull up causing a one
digitalWrite(i, LOW); // disable internal pull up causing zero and thus an interrupt
pinMode(i, INPUT);
digitalWrite(i, HIGH); // enable internal pull up
}
delay(10);
// put the reader input variables to zero
reader1 = reader2 = reader3 = 0;
reader1Count = reader2Count = reader3Count = 0;
digitalWrite(13, HIGH); // show Arduino has finished initilisation
}
void loop() {
if (reader1Count >= 34) {
Serial.print("ReaderA:");
ReaderA = reader1 & 0xfffffff;
ReaderA = (Default - ReaderA) / 2;
Serial.println(ReaderA);
reader1 = 0;
reader1Count = 0;
}
/*
if(reader2Count >= 34){
Serial.print("ReaderB:");Serial.println(reader2 & 0xffff);
reader2 = 0;
reader2Count = 0;
}
if(reader3Count >= 26){
Serial.print("ReaderC:");Serial.println(reader3 & 0xfffffff);
reader3 = 0;
reader3Count = 0;
}
*/
}
