EthercatDevice_DmpHID.uartQueryRxQueue()

[EthercatDevice_DmpHID_Generic]

描述

Get the current number of bytes in the software RX FIFO for the specified UART port of the specified EtherCAT slave device in this library.

衍生類別：

語法

int uartQueryRxQueue(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

The current number of bytes in the software RX FIFO for the specified UART port. 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 setup() {
  Serial.begin(115200);

  master.begin();
  slave.attach(0, master);
  Serial.print("RX FIFO: ");
  Serial.println(slave.uartQueryRxQueue(0));
}

void loop() {
  // ...
}

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