Unable to use 2 readers on Arduino Zero

[zackjd]

Can't use 2 readers with example code.

One reader works fine, but when trying to use 2 readers only one of them will print any output.

Attempted with modified advanced example because pin 4 can't be used as an interrupt.

`/*
Advanced HidProxWiegand usage example.
*/

#include <Arduino.h>
#include "HidProxWiegand.h"

#define PIN_RDR1_DATA0 2 // The pin to use for reader 1, DATA 0.
#define PIN_RDR1_DATA1 3 // The pin to use for reader 1, DATA 1.
#define PIN_RDR2_DATA0 5 // The pin to use for reader 2, DATA 0.
#define PIN_RDR2_DATA1 6 // The pin to use for reader 2, DATA 1.

// Reader 1 outputs.
//#define PIN_RDR1_BUZZER 6
//#define PIN_RDR1_GREEN_LED 7
//#define PIN_RDR1_RED_LED 8

//Reader 2 outputs.
//#define PIN_RDR2_BUZZER 9
//#define PIN_RDR2_GREEN_LED 10
//#define PIN_RDR2_RED_LED 11

ProxReaderInfo* reader1; // Card reader 1.
ProxReaderInfo* reader2; // Card reader 2.

// Callback for handling card reads from reader 1.
void cardRead1Handler(ProxReaderInfo* reader) {
Serial.print(F("Card read: "));
Serial.print(reader->facilityCode);
Serial.print(F(":"));
Serial.println(reader->cardCode);

 // Here you can add logic to see if the card that was read was actually
 // valid or whatever. For example: reading stored card numbers from EEPROM
 // and looking for a match. Ideal for access control applications.
 //
 // This would also be where you would want to change state of the buzzer
 // and LEDs on the reader.
 //digitalWrite(PIN_RDR1_BUZZER, HIGH);
 //digitalWrite(PIN_RDR1_RED_LED, LOW);
 //digitalWrite(PIN_RDR1_GREEN_LED, HIGH);
 //delay(500);
 //digitalWrite(PIN_RDR1_BUZZER, LOW);
 //digitalWrite(PIN_RDR1_GREEN_LED, LOW);
 //digitalWrite(PIN_RDR1_RED_LED, HIGH);

}

void cardRead2Handler(ProxReaderInfo* reader) {
Serial.print(F("Card read: "));
Serial.print(reader->facilityCode);
Serial.print(F(":"));
Serial.println(reader->cardCode);

 //digitalWrite(PIN_RDR2_BUZZER, HIGH);
 //digitalWrite(PIN_RDR2_RED_LED, LOW);
 //digitalWrite(PIN_RDR2_GREEN_LED, HIGH);
 //delay(500);
 //digitalWrite(PIN_RDR2_BUZZER, LOW);
 //digitalWrite(PIN_RDR2_GREEN_LED, LOW);
 //digitalWrite(PIN_RDR2_RED_LED, HIGH);

}

// Handle interrupt for reader 1, DATA 0.
void handleInterrupt0() {
if (reader1 != NULL) {
reader1->ISR_Data0();
}
}

// Handle interrupt for reader 1, DATA 1.
void handleInterrupt1() {
if (reader1 != NULL) {
reader1->ISR_Data1();
}
}

// Handle interrupt for reader 2, DATA 0.
void handleInterrupt2() {
if (reader2 != NULL) {
reader2->ISR_Data0();
}
}

// Handle interrupt for reader 2, DATA 1.
void handleInterrupt3() {
if (reader2 != NULL) {
reader2->ISR_Data1();
}
}

void setup() {
Serial.begin(9600);
while (!Serial) {
delay(10);
}

 // Create the readers and attach them to the system.
 reader1 = HidProxWiegand.addReader(PIN_RDR1_DATA0, PIN_RDR1_DATA1, cardRead1Handler);
 reader2 = HidProxWiegand.addReader(PIN_RDR2_DATA0, PIN_RDR2_DATA1, cardRead2Handler);

 // Attach interrupt handlers for readers 1 and 2.
 HidProxWiegand_AttachReaderInterrupts(PIN_RDR1_DATA0, PIN_RDR1_DATA1, handleInterrupt0, handleInterrupt1);
 HidProxWiegand_AttachReaderInterrupts(PIN_RDR2_DATA0, PIN_RDR2_DATA1, handleInterrupt2, handleInterrupt3);

 // Init reader 1 outputs.
 //pinMode(PIN_RDR1_BUZZER, OUTPUT);
 //digitalWrite(PIN_RDR1_BUZZER, LOW);
 //pinMode(PIN_RDR1_GREEN_LED, OUTPUT);
 //digitalWrite(PIN_RDR1_GREEN_LED, LOW);
 //pinMode(PIN_RDR1_RED_LED, OUTPUT);
 //digitalWrite(PIN_RDR1_RED_LED, HIGH);

 // Init reader 2 outputs.
 //pinMode(PIN_RDR2_BUZZER, OUTPUT);
 //digitalWrite(PIN_RDR2_BUZZER, LOW);
 //pinMode(PIN_RDR2_GREEN_LED, OUTPUT);
 //digitalWrite(PIN_RDR2_GREEN_LED, LOW);
 //pinMode(PIN_RDR2_RED_LED, OUTPUT);
 //digitalWrite(PIN_RDR2_RED_LED, HIGH);

}

void loop() {
// Process any cards that have been read.
HidProxWiegand.loop();
}`