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Digital Input with External Interrupts

Input digital pins are readable as high or low.

Some specific pins generate external interrupts on pin changes:

        int0    int1
UNO       D2      D3
MEGA     D21     D20

API

Includes

#include "intX.ceu"     // `X` is a digit, e.g., `int0.ceu`

Inputs

INTX

input none INTX;        // `X` is a digit, e.g., `INT0`
  • Occurrences:
    • whenever the state of the pin changes
  • Payload:
    • none

Code Abstractions

INTX_Get

Gets the current state of the pin.

code/call INTX_Get (none) -> high/low do

Parameters:

  • none

Return:

  • high/low: current state of the pin

Examples

Input / Output

State of output pin 13 follows the state of pin associated with INT0:

#include "out.ceu"
#include "int0.ceu"     // UNO=D2, MEGA=D21

output high/low OUT_13;

var high/low v = call INT0_Get();
emit OUT_13(v);

loop do
    await INT0;
    v = call INT0_Get();
    emit OUT_13(v);
end