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oshryatias
oshryatias
Associate
January 22, 2014
Question

spi1 work well only in debug mode

  • January 22, 2014
  • 5 replies
  • 1324 views
Posted on January 22, 2014 at 09:41

i am trying to communicate between stm32100rb discovery value and transceiver cc2500 via spi1. for checking, i wrote a value to the cc2500 to specific register, and then, i read the value of this register, and print it.

when i use the debug, it work well, and give me the right value.(even when it in debug mode only, and i press the reset button, it also work well, although i don't running it with the debug application).

when i download the same code, and running it without turn on the debug, it print me wrong value( like 'f' or '0', instead of '29' in my case)

i will be happy for some advice.. thank you!
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    5 replies

    chen
    chen
    Associate II
    January 22, 2014
    Posted on January 22, 2014 at 16:57

    Hi

    ''and running it without turn on the debug, it print me wrong value( like 'f' or '0', instead of '29' in my case)

    i will be happy for some advice..''

    When you run it without the debugger - do you power the STM32 and cc2500 off the same source?

    Do you power the 2 up together?

    oshryatias
    oshryatiasAuthor
    Associate
    January 22, 2014
    Posted on January 22, 2014 at 17:12

    hi, thank you!

    the stm32 power by the usb cable and also by 5v pin by cp2102(ttl to usb) which i use for uart.

    the transceiver cc2500 power by connect to 3.3v pin (the cc2500 need to be power between 1.8-3.6v)

    Tesla DeLorean
    Tesla DeLorean
    Guru
    January 22, 2014
    Posted on January 22, 2014 at 17:21

    Would check how you're resetting the other device, and if you're waiting long enough at start-up for it to come ready/functional.

    Review specs, add a delay
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    oshryatias
    oshryatiasAuthor
    Associate
    January 22, 2014
    Posted on January 22, 2014 at 18:36

    hello clive!

    the cc2500 reset when it turn on.

    i already add a delay, i already ''play'' with this delay a lot.

    the cc2500 work with spi protocol. i wait after i turn the SS to low, before writing to the device.

    it work well with the debug(when i run all the code at once, not only step by step), what make the different? what the debug give me, which i need to use?

    Tesla DeLorean
    Tesla DeLorean
    Guru
    January 22, 2014
    Posted on January 22, 2014 at 19:10

    The debugger can enable pins, peripherals and clocks that you fail to do. The initial connection at reset takes a while to complete, allowing some code present to run first. Running code may also go slower, or have certain clocks/watchdogs disabled when wait for the user at the console.

    Connect you device to a serial port, output diagnostic information there, have a Hard Fault handler that can catch/display fault information. Understand the flow and behaviour of your code off the debugger. Dump the register/peripheral settings in debug and non-debug modes and compare/contrast the differences.

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