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Booting from SD card the SPI is not working, rest of program is working

Bogi Magnussen
Prodigy 250 points

Hello

I have made a program using starterware libraries which read samples from an external ADC using SPI into a buffer. When the buffer is full, the samples are transmitted using lwip over ethernet to host program.

If i program the processor with CCS and run the program everything works fine. However, if I put the program on the sd-card (using the binary with _ti extension) the SPI does not appear to be running. The BB is able to start lwip and connect to my host program (running on pc) I can also initiate the ADC reading process, and the buffer is filled with zeros. Furthermore, transmitting the values in the buffer to the host is also working.

So: The program is running from the sd-card exactly just fine, however the SPI is not running (at least not the SPI-clock)

Is there anybody who has any hints as to what could be causing this?

  • 0
    Genius 5820 points

    A few ideas:

    1. Are you running Debug or Release version on your SD-card? When Release version is the one that is not working please try again with Debug - some of the optimisations used for Release-build damage code and leave parts of the hardware functions unusable.

    2. Are you using BB or BBB? In case it is an BeagleBone Black: please apply the patch that is available on download page for StarterWare

  • 0 in reply to qxc
    Prodigy 250 points

    Hi qxc

    I tried running both debug and release versions from CCS and SD-card with the same result. Everything works fine, except SPI is not running when booting from SD card.

    I am using BB (not black)

    I will try a different BB board and also shift to using SPI 1 instead of SPI 0 and see if the error is still there.