EthercatDevice_DmpHID.uartWrite()

[EthercatDevice_DmpHID_Generic]

Description

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

Derived Class:

Syntax

int uartWrite(int dev, uint8_t value);

Parameters

• [in] int dev
  The specified UART port of the EtherCAT slave device.
  • 0 for COM1.
  • 1 for COM2.
• [in] unit8_t value
  The one byte data to be transmitted.

Return Value

Return the number of bytes transmitted. If the return value is smaller than 0, it means an error code.

Comment

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.

Example

#include "Ethercat.h"

EthercatMaster master;
EthercatDevice_QECR11HU9S slave;

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

void setup() {
  master.begin();
  slave.attach(0, master);
  master.attachCyclicCallback(CyclicCallback);
  master.start();

  slave.uartWrite(0, 'H');
  slave.uartWrite(0, 'e');
  slave.uartWrite(0, 'l');
  slave.uartWrite(0, 'l');
  slave.uartWrite(0, 'o');
}

void loop() {
  // ...
}

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