EthercatDevice_DmpHID.uartReceive()

[EthercatDevice_DmpHID_Generic]

描述

Receive multiple bytes data from the specified UART port of the EtherCAT slave device.

衍生類別：

語法

int uartReceive(int dev, void *buf, size_t size);

參數

• [in] int dev
  The specified UART port of the EtherCAT slave device.
  • 0 for COM1.
  • 1 for COM2.
• [in] void *buf
  The data buffer to be received.
• [in] size_t size
  The size of the data buffer.

回傳值

Return the number of bytes received. 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;

char buffer[256];
int rc;

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

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

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

void loop() {
  rc = slave.uartReceive(0, buffer, 256);
  for (int i = 0; i < rc; i++) {
    Serial.print(buffer[i]);
  }

  // ...
}

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