EthercatDevice_DmpHID.keypadRead()

[EthercatDevice_DmpHID_Generic]

描述

Read the input character from the keypad of the EtherCAT slave device.

語法

int keypadRead();

參數

無

回傳值

Read a character from the keypad. Return ‘\0’ if no data is available. If the return value is less than 0, it indicates an 錯誤代碼.

備註

This function must be called after a successful execution of EthercatMaster::begin(). This function is non-blocking and can be called within the Cyclic Callback.

範例

#include "Ethercat.h"

EthercatMaster master;
EthercatDevice_QECR11HU9S slave;

void CyclicCallback() {
  slave.update();
}

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

  master.begin();
  slave.attach(0, master);
  master.attachCyclicCallback(CyclicCallback);
  master.start();
}

void loop() {
  int ch;
  if ((ch = slave.keypadRead()) != '\0') {
    Serial.print((char)ch);
  }

  // ...
}

Please see EthercatDevice_DmpHID_Generic 類別 for more QEC HID slave instructions and API usage.