Nano 33 iot - reassigning interrupts

Official Hardware Nano Family Nano 33 IoT
1

Hello,

I am trying to reassign interrupts to D4 and D5 inputs by modifying ~/Library/Arduino15/packages/arduino/hardware/samd/1.8.12/variants/nano_33_iot/variant.cpp (as suggested at Befuddled about interrupts and pin assignments)

I want to use EXTERNAL_INT_4 and EXTERNAL_INT_5 from pins D9 and D10 (where I do not need them)

here is a modified fragment of variant.cpp

  // 0/1 - SERCOM/UART
  { PORTB, 23, PIO_SERCOM_ALT, (PIN_ATTR_DIGITAL                             ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE }, // RX:   SERCOM5/PAD[3]
  { PORTB, 22, PIO_SERCOM_ALT, (PIN_ATTR_DIGITAL                             ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE }, // TX:   SERCOM5/PAD[2]
  // 2..7
  // Digital Low
  { PORTB, 10, PIO_DIGITAL,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), No_ADC_Channel, PWM5_CH0,   TC5_CH0,      EXTERNAL_INT_10   },
  { PORTB, 11, PIO_DIGITAL,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), No_ADC_Channel, PWM5_CH1,   TC5_CH1,      EXTERNAL_INT_11   },
// ***  { PORTA,  7, PIO_DIGITAL,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), ADC_Channel7,   PWM1_CH1,   TCC1_CH1,     EXTERNAL_INT_NONE }, //*** orig
// ***  { PORTA,  5, PIO_DIGITAL,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), ADC_Channel5,   PWM0_CH1,   TCC0_CH1,     EXTERNAL_INT_NONE }, //*** orig
  { PORTA,  7, PIO_DIGITAL,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER,     EXTERNAL_INT_4 },  //*** <<< modified
  { PORTA,  5, PIO_DIGITAL,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER,     EXTERNAL_INT_5 },  //*** <<< modified
  { PORTA,  4, PIO_DIGITAL,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), ADC_Channel4,   PWM0_CH0,   TCC0_CH0,     EXTERNAL_INT_NONE },
  { PORTA,  6, PIO_DIGITAL,  (PIN_ATTR_DIGITAL                                ), ADC_Channel6,   NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },
  // 8..12
  // Digital High
  { PORTA, 18, PIO_DIGITAL, (PIN_ATTR_DIGITAL                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },
// ***  { PORTA, 20, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER_ALT), No_ADC_Channel, PWM0_CH6,   TCC0_CH6,     EXTERNAL_INT_4    },  //*** orig
// ***  { PORTA, 21, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER_ALT), No_ADC_Channel, PWM0_CH7,   TCC0_CH7,     EXTERNAL_INT_5    },  //*** orig
  { PORTA, 20, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER_ALT), No_ADC_Channel, PWM0_CH6,   TCC0_CH6,     EXTERNAL_INT_NONE   },     // *** <<< modified
  { PORTA, 21, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER_ALT), No_ADC_Channel, PWM0_CH7,   TCC0_CH7,     EXTERNAL_INT_NONE   },     // *** <<< modified
  { PORTA, 16, PIO_SERCOM,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), No_ADC_Channel, PWM2_CH0,   TCC2_CH0,     EXTERNAL_INT_0    }, // MOSI: SERCOM1/PAD[0]
  { PORTA, 19, PIO_SERCOM,  (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER    ), No_ADC_Channel, PWM3_CH1,   TC3_CH1,      EXTERNAL_INT_NONE }, // MISO: SERCOM1/PAD[3]
  // 13 (LED)
  { PORTA, 17, PIO_SERCOM,  (PIN_ATTR_DIGITAL                                ), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_1    }, // SCK:  SERCOM1/PAD[1]

.. however the ext_int_4 does not work for me on pin D4. Where is the problem?

thanks

JS

2

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