I am making a control program for a data collection system using FPC + Lazarus on a Raspberry Pi2 platform. I will use a number of Delphi units, which implement the communications and data handling needs in a way that works fine on a Windows platform.
While looking over existing code I see that there are instructions to modify received data from the instrument by reversing the byte order. The reason for that was that the instrument is based on a Motorola controller and it uses the opposite byte order as in the Intel CPU:s on the PC. Since download is of binary data areas in the instrument the byte order change was necessary for all multi-byte data like word and integers as well as real (floating point 32 bit values). Now I wonder if it will be necessary also on an ARM platform like the RPi2? Is there a function or such to interrogate the byte order of the platform FPC runs on? So that I could add a test at the start of download to check if swapping is needed? Or is the ARM used on RPi2 working with the same byte order as the Motorola MC68HC11 MCU is? In that case I must switch out the swapping... -- Bo Berglund Developer in Sweden _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal