EthercatDevice_DmpHID.uartRead()

[EthercatDevice_DmpHID_Generic]

描述

Read one byte data from the specified UART port of the EtherCAT slave device.

衍生類別：

語法

int uartRead(int dev);

參數

• [in] int dev
  The specified UART port of the EtherCAT slave device.
  • 0 for COM1.
  • 1 for COM2.

回傳值

Return one byte data. If the return value is smaller than 0, it means 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 = slave.uartRead(0);
  if (ch >= 0)
    Serial.print((char)ch);

  // ...
}

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