EthercatDevice_DmpHID.uartWrite()

[EthercatDevice_DmpHID_Generic]

描述

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

衍生類別：

語法

int uartWrite(int dev, uint8_t value);

參數

• [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.

回傳值

Return the number of bytes transmitted. 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() {
  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 類別 for more QEC HID slave instructions and API usage.