Compiling (on Omega+) AD7999 driver fails



  • Hi,

    Added the ability to compile on the Omega+ following the blog posts from a while ago. The code is from:

    https://github.com/ControlEverythingCommunity/AD7999/blob/master/C/AD7999_4Channel.c

    The compile fails with:

    gcc AD7999_4Channel.c -o AD7999
    AD7999_4Channel.c: In function 'main':
    AD7999_4Channel.c:30:2: warning: implicit declaration of function 'write' [-Wimplicit-function-declaration]
    write(file, config, 1);
    ^
    AD7999_4Channel.c:31:2: warning: implicit declaration of function 'sleep' [-Wimplicit-function-declaration]
    sleep(1);
    ^
    AD7999_4Channel.c:36:5: warning: implicit declaration of function 'read' [-Wimplicit-function-declaration]
    if(read(file, data, 2) != 2)
    ^
    AD7999_4Channel.c:51:7: error: redefinition of 'config'
    char config[1] = {0x20};
    ^
    AD7999_4Channel.c:29:7: note: previous definition of 'config' was here
    char config[1] = {0x10};
    ^
    AD7999_4Channel.c:57:7: error: redefinition of 'data'
    char data[2]={0};
    ^
    AD7999_4Channel.c:35:7: note: previous definition of 'data' was here
    char data[2]={0};
    ^
    AD7999_4Channel.c:73:7: error: redefinition of 'config'
    char config[1] = {0x40};
    ^
    AD7999_4Channel.c:51:7: note: previous definition of 'config' was here
    char config[1] = {0x20};
    ^
    AD7999_4Channel.c:79:7: error: redefinition of 'data'
    char data[2]={0};
    ^
    AD7999_4Channel.c:57:7: note: previous definition of 'data' was here
    char data[2]={0};
    ^
    AD7999_4Channel.c:95:7: error: redefinition of 'config'
    char config[1] = {0x80};
    ^
    AD7999_4Channel.c:73:7: note: previous definition of 'config' was here
    char config[1] = {0x40};
    ^
    AD7999_4Channel.c:101:7: error: redefinition of 'data'
    char data[2]={0};
    ^
    AD7999_4Channel.c:79:7: note: previous definition of 'data' was here
    char data[2]={0};

    No experience at all with C, so no clue what is happening there. Any hints/tips welcome

    Bas



  • The given C code is for the Beaglebone black, not the Omega2. For the Omega2, they provide a python script. See https://github.com/ControlEverythingCommunity/AD7999#onion-omega for details.

    Also, I corrected the errors in the C program so that it should compile (untested): https://pastebin.com/JbRsABaa
    Basically it was redefining lots of already existant variables, which is nonsense. I just modified them to alter the existing memory / clear old buffers. Successful compilation doesn't ofcourse mean that it works -- this program was still written for the Beaglonebone Black.

    The main problem of course is that you attempt to compile a C program without knowing C, so you're pretty helpless when a compile error occurs. As I said, there's also a python script, so you should try that first.



  • @Maximilian-Gerhardt

    Hi Maximillian,

    There is an issue with the Python code that causes reads to not return correct results (http://community.onion.io/topic/2347/issues-with-controleverything-ad7999/6). ControlEverything recommended to try the C code.

    I'll give your fix'ed up code a try tonight!

    Tx
    Bas



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