====== Ictd() ======

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

{{:en-us_commands:reference:ictd.svg?900|Ictd command operation flow}}

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

===== Commands =====

^ Command ^ Arguments ^ Return Value ^ Operation ^
| ''Ictd(counter_id, CD, LOAD, PV)'' | ''uint8_t counter_id'' — Counter number. Supports ''0'' ~ ''255'', the ''uint8_t'' range\\ ''bool CD''\\ ''bool LOAD''\\ ''int32_t PV'' — Preset value | ''bool'' | Loads the preset value, then decrements the current value at each input rising edge. |


===== Example =====

This example uses the P0 and P1 inputs and the P32 output on MPINO-8A4R(T)-S.

<code cpp>
const uint8_t COUNTER_ID = 1;
const int32_t START_QUANTITY = 50;

void setup() {
  Serial.begin(115200);
}

void loop() {
  const bool shipped = digitalRead(0) == HIGH;
  const bool loadQuantity = digitalRead(1) == HIGH;
  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);
}
</code>

===== Precautions =====

  * 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.

===== Built-in Commands in the Same Category =====

  * [[:en-us_commands:reference:ictu|Ictu() View detailed description]]
  * [[:en-us_commands:reference:ictud|Ictud() View detailed description]]
  * [[:en-us_commands:reference:igetcount|IgetCount() View detailed description]]
  * [[:en-us_commands:reference:isetcount|IsetCount() View detailed description]]
  * [[:en-us_commands:reference:ictuddownstate|IctudDownState() View detailed description]]

[[:en-us_commands:builtin|← Built-in Command List]]