Ictd() loads the preset value, then decrements the current value at each input rising edge.

bool Ictd(uint8_t counter_id, bool CD, bool LOAD, int32_t PV)

const uint8_t COUNTER_ID = 1;
const int32_t START_QUANTITY = 50;
 
void setup() {
  Serial.begin(115200);
}
 
void loop() {
  const bool shipped = IdigitalRead(0, 5);  // Read the input repeatedly and update only if all samples match. If HIGH and LOW are mixed, retain the previous stable state.
  const bool loadQuantity = IdigitalRead(1, 5);  // Read the input repeatedly and update only if all samples match. If HIGH and LOW are mixed, retain the previous stable state.
  const bool empty = Ictd(COUNTER_ID, shipped, loadQuantity, START_QUANTITY);  // Load the preset, then decrement the current value on each rising input edge.
  digitalWrite(32, empty ? HIGH : LOW);
}

• The previous fixed 0~31 restriction has been removed. However, the argument type is uint8_t, so the maximum ID is 255.
• If insufficient memory prevents allocation of counter state, counter commands return false or 0.
• Once created, counter state is retained while the program runs.

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