pins.cpp

#include "pins.hpp"

MCP23S08 MCP(SS, MISO, MOSI, SCK);
volatile byte ISR_FLAG = 0;
struct pins PINS;

void IRAM_ATTR isr(){
  ISR_FLAG = 1;
}

void initializeMCP()
{
  pinMode(ISR_PIN, INPUT_PULLUP);
  //attachInterrupt(digitalPinToInterrupt(ISR_PIN), isr, CHANGE);
  attachInterrupt(digitalPinToInterrupt(TRIGGER_SIGNAL), isr, CHANGE);

  SPI.begin();
  MCP.begin();

  // Enable inputs and interrupts on pins 0-2
  MCP.pinMode8(0b00000111);
  MCP.enableInterrupt(0, FALLING);
  MCP.enableInterrupt(1, FALLING);
  MCP.enableInterrupt(2, FALLING);
  Serial.println("MCP23S08 Started");

}


void isr_check_loop()
{
  if (ISR_FLAG == 1){
    PINS.sib = false;
    PINS.plc = false;
    PINS.ups = false;
    PINS.last_triggered = millis();

    Serial.print("Interrupt: ");
    uint8_t regval = MCP.getInterruptCaptureRegister();  //INTCAP
    Serial.print(regval);

    uint8_t mask = 1 << 0;
    if (!(regval & mask)) {
      Serial.print("UPS");
      PINS.ups = true;
    }

    mask = 1 << 1;
    if (!(regval & mask)) {
      Serial.print("PLC");
      PINS.plc = true;
    }

    mask = 1 << 2;
    if (!(regval & mask)) {
      Serial.print("SIB");
      PINS.sib = true;
    }

    Serial.println();
    ISR_FLAG = 0;
  }
}

bool on = true;
unsigned long toggle_start = 0;
void toggle_status_led() {
    if (millis() - toggle_start  >= 1000) {
        toggle_start = millis();
    	on = !on;
        MCP.write1(STATUS_LED_PIN, on);
     }
}