Flashing LPC11U24 or LPC1343 from Mac OS X

Here is how to flash an LPC11U24 or LPC1343 from Mac OS X using the ROM-based USB bootloader.
This post is just code snippet-style and I'm assuming you have a compiled .bin file and have the MCU connected with a USB cable so a disk named "CRP DISABLD" appears on the desktop.

  1. Add the required checksum using the crc executable as described here:
  2. In Terminal do
    $ df -h

    to identify the filesystem device that is mounted as the CRP DISABLD disk. It will be something like "/dev/disk1" (which I will use in this example).

  3. Unmount the disk using
    $ diskutil unmount /dev/disk1
  4. Copy binary file to device using
    $ dd if=firmware.bin of=/dev/disk1 seek=4

    This is where the tricky stuff happens. In order for everything to work we must write data beginning at sector 4. And if we just copy the file in the Finder the OS will start at sector 6.

The info here is extracted from and

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