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