EthercatDevice_DmpHID.lcmPrint()

[EthercatDevice_DmpHID_Generic]

描述

Print the specified string to the LCM screen of the EtherCAT slave device.

衍生類別：

語法

int lcmPrint(const char *fmt, ...);

參數

• [in] const char *fmt
  The string to be printed on the LCM screen. This is a pointer to a null-terminated string containing the format specification for the output. The format string follows the same format as the printf function in C, allowing for insertion of variables and formatting options.
• [in] ...
  This is a variable number of arguments that will be inserted into the formatted string according to the format specifiers in the fmt string.

回傳值

Return the number of characters printed to the LCM screen. 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.lcmPrint("Hello world!");
}

void loop() {
  // ...
}

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