swift serial example

Examples/SwiftSerialExample/Sources/main.swift

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+import Foundation
+import SwiftLinuxSerial
+
+print("You should do a loopback i.e short the TX and RX pins of the target serial port before testing.")
+
+let testString: String = "The quick brown fox jumps over the lazy dog 01234567890."
+
+let arguments = CommandLine.arguments
+guard arguments.count >= 2 else {
+    print("Need serial port name, e.g. /dev/ttyUSB0 as the first argument.")
+    exit(1)
+}
+
+let portName = arguments[1]
+let serialPort: SerialPort = SerialPort(name: portName)
+
+do {
+    try serialPort.openPort()
+    print("Serial port \(portName) opened successfully.")
+    defer {
+        serialPort.closePort()
+    }
+
+    serialPort.setSettings(receiveRate: .baud9600,
+                           transmitRate: .baud9600,
+                           minimumBytesToRead: 1)
+
+    print("Writing test string <\(testString)> of \(testString.characters.count) characters to serial port")
+
+    var bytesWritten = try serialPort.writeString(testString)
+
+    print("Successfully wrote \(bytesWritten) bytes")
+    print("Waiting to receive what was written...")
+
+    let stringReceived = try serialPort.readString(ofLength: bytesWritten)
+
+    if testString == stringReceived {
+        print("Received string is the same as transmitted string. Test successful!")
+    } else {
+        print("Uh oh! Received string is not the same as what was transmitted. This was what we received,")
+        print("<\(stringReceived)>")
+    }
+
+} catch PortError.failedToOpen {
+    print("Serial port \(portName) failed to open. You might need root permissions.")
+} catch {
+    print("Error: \(error)")
+}