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copied!<p>Try the ioctl call - you can specify an arbitrary baud rate. That is,</p> <p><em>ioctl(serialFileDescriptor, IOSSIOSPEED, &baudRate);</em></p> <p><strong>To open the serial port:</strong></p> <pre><code>// Open the serial like POSIX C serialFileDescriptor = open( "/dev/tty.usbserial-A6008cD3", O_RDWR | O_NOCTTY | O_NONBLOCK ); // Block non-root users from using this port ioctl(serialFileDescriptor, TIOCEXCL); // Clear the O_NONBLOCK flag, so that read() will // block and wait for data. fcntl(serialFileDescriptor, F_SETFL, 0); // Grab the options for the serial port tcgetattr(serialFileDescriptor, &options); // Setting raw-mode allows the use of tcsetattr() and ioctl() cfmakeraw(&options); // Specify any arbitrary baud rate ioctl(serialFileDescriptor, IOSSIOSPEED, &baudRate); </code></pre> <p><strong>To read from the serial port:</strong></p> <pre><code>// This selector will be called as another thread - (void)incomingTextUpdateThread: (NSThread *) parentThread { char byte_buffer[100]; // Buffer for holding incoming data int numBytes=1; // Number of bytes read during read // Create a pool so we can use regular Cocoa stuff. // Child threads can't re-use the parent's autorelease pool NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; // This will loop until the serial port closes while(numBytes>0) { // read() blocks until data is read or the port is closed numBytes = read(serialFileDescriptor, byte_buffer, 100); // You would want to do something useful here NSLog([NSString stringWithCString:byte_buffer length:numBytes]); } } </code></pre> <p><strong>To write to the serial port:</strong></p> <pre><code>uint8_t val = 'A'; write(serialFileDescriptor, val, 1); </code></pre> <p><strong>To list availble serial ports:</strong></p> <pre><code>io_object_t serialPort; io_iterator_t serialPortIterator; // Ask for all the serial ports IOServiceGetMatchingServices( kIOMasterPortDefault, IOServiceMatching(kIOSerialBSDServiceValue), &serialPortIterator); // Loop through all the serial ports while (serialPort = IOIteratorNext(serialPortIterator)) { // You want to do something useful here NSLog( (NSString*)IORegistryEntryCreateCFProperty( serialPort, CFSTR(kIOCalloutDeviceKey), kCFAllocatorDefault, 0)); IOObjectRelease(serialPort); } IOObjectRelease(serialPortIterator); </code></pre>

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