Table of Contents

FILO()

FILO() outputs the last stored 16-bit data first.

FILO command operation flow

bool FILO(uint8_t filo_id, bool IN, bool OUT, uint16_t input, uint16_t &output, uint8_t size, bool reset = false)

Commands

Command Arguments Return Value Operation
FILO(filo_id, IN, OUT, input, output, size, reset) uint8_t filo_id
bool IN — Store input on the rising edge
bool OUT — Output on the rising edge
uint16_t input — Word to store
uint16_t &output — Reference variable receiving the output
uint8_t size — Buffer size
bool reset = false — Reset the buffer 		bool Outputs the last stored 16-bit data first.

Example

Send a in Serial Monitor to store the next number, p to retrieve the most recently stored number, or c to clear the buffer. Send one character at a time to observe the behavior. 

uint16_t nextNumber = 0;
uint16_t lastNumber = 0;
 
void setup() {
  Serial.begin(115200);
}
 
void loop() {
  if (!Serial.available()) return;
  const char action = Serial.read();
  const bool store = action == 'a';
  const bool retrieve = action == 'p';
  const bool clearBuffer = action == 'c';
  if (store) ++nextNumber;
 
  const bool ok = FILO(0, store, retrieve, nextNumber, lastNumber, 16, clearBuffer);  // Store a number; on a pop signal, retrieve the last stored number.
  FILO(0, false, false, nextNumber, lastNumber, 16, false);  // Return both inputs to LOW so the next character creates a new rising edge.
  if (retrieve && ok) Serial.println(lastNumber);
  if (retrieve && !ok) Serial.println(F("Buffer empty"));
}

Precautions

IN, OUT, CU and CD act on rising edges. Use a unique id for each counter or buffer, and keep size to the required minimum.

Built-in Commands in the Same Category

← Built-in Command List