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I have an RFID reader connected to an Arduino board. I'd like to connect to it over its serial interface, and whenever the RFID reader omits a signal ( when it has read an (RF)ID ), I'd like to retrieve it in my C++ program.
I already have the code for simply printing the RFID to serial from the Arduino.
What I don't know, is how to read it from C++ in Linux ?
I have looked at libserial, which looks straightforward. However, how can I have the C++ program react to a signal and then read the RFID, instead of listening continously? Is this necessary?
EDIT: In most examples I have read, the (c++) program sends input, and recieves output. I just want to listen and recieve output from the Arduino.
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Upload the sketch and send messages using the Serial Monitor. Open the Serial Monitor by clicking the Monitor icon (see Recipe 4.1) and type a digit in the text box at the top of the Serial Monitor window. Clicking the Send button will send the character typed into the text box; you should see the blink rate change.
All standard C and C++ constructs supported by avr-g++ should work in Arduino. For more details, see the page on the Arduino build process.
UART stands for Universal Asynchronous Reception and Transmission and is a simple communication protocol that allows the Arduino to communicate with serial devices. The UART system communicates with digital pin 0 (RX), digital pin 1 (TX), and with another computer via the USB port.
You can use the Arduino environment's built-in serial monitor to communicate with an Arduino board. Click the serial monitor button in the toolbar and select the same baud rate used in the call to begin() . Serial communication on pins TX/RX uses TTL logic levels (5V or 3.3V depending on the board).
On unix you use the select() call to wait for an input. The select() call acts like a sleep - using no CPU until the kernel receives the hardware interrupt and triggers the select().
http://tldp.org/HOWTO/Serial-Programming-HOWTO/index.html
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