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Cymbet-RTC

Supporting Software for Cymbet-Eval-06 USB-based Real Time Clock

All software here depends on a system with working FTDI drivers and a working installation of libmpsse from google code: http://code.google.com/p/libmpsse/

First RELEASE CANDIDATE This code is still in Alpha Test, but I believe all base functionality is now included. (taking a command line time argument for setclock still to be done).

If you download the code, feedback, bug reports, and most of all suggested patches are highly encouraged.

Installation

  1. Dependencies A. Working FTDI drivers Plug in your RTC board and issue the lsusb command. If you do not see a line like: . Bus ??? Device ???: ID 0403:6010 Future Technology Devices International, Ltd FT2232C Dual USB-UART/FIFO IC . Then you probably don't have working drivers.

    (At the very least, you should see some enumeration of a device with ID 0403:6010 or this isn't going to work.)

    If you have more than one such line, you may need to alter the Opening sequence in the software to ensure connection to the correct device.

B. Google Code libmpsse Download from http://code.google.com/p/libmpsse/ if you don't already have it. After unpacking, the relevant software will be in libmpsse-1.2/src Change into that directory and follow the directions in ../docs/INSTALL (usually configure, make, make install)

  1. Building the software

Once the dependencies are satisfied, you should be able to just type make install and have everything compile and install automatically.

If you want to make without installing, just type make. This should produce three binaries in the local directory -- readclock, setclock, and setSystemTime.

  1. Using the software

readclock will grab all information from the clock and display it. setclock takes an optional command-line argument and will set the time in the RTC.

If a command line argument is specified, then setclock will immediately set the RTC to the value specified if it can be parsed.

If no argument is specified, setclock will do the following: Stop the RTC Set the RTC time to system time + 2 seconds. Wait (ungracefully pending in a tight loop) for the system clock to reach the specified time Start the RTC

setSystemTime will set the system clock from the data read from the RTC.

Note: All software assumes UTC and makes no allowances for timezones. (The system clock is UTC on almost all systems and local time is just what is displayed, so this should not be a problem).