[SOLVED] Semihosting on STM32 with GNU ARM Embedded, Eclipse and JLink GDB Server

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  • [SOLVED] Semihosting on STM32 with GNU ARM Embedded, Eclipse and JLink GDB Server

    Hi

    I'm facing an issue regarding the semihosting mode with a STM32F207ZG (Cortex M3) and a J-Link (Lite).

    I use the latest GNU ARM embedded 4.7 2013q2 and Eclipse.

    Code :

    Source Code

    1. #include <stdio.h>
    3. int main(void)
    4. {
    5. RCC_ClocksTypeDef RCC_Clocks;
    7. STM_EVAL_LEDInit(LED4);
    9. /* Initialize User_Button */
    10. STM_EVAL_PBInit(BUTTON_USER, BUTTON_MODE_GPIO);
    12. /* SysTick end of count event each 1ms */
    13. RCC_GetClocksFreq(&RCC_Clocks);
    14. SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);
    16. while(1)
    17. {
    18. /* Check if the user button is pressed */
    19. if(STM_EVAL_PBGetState(BUTTON_USER) == 0) {
    20. printf("Hello World !\n");
    21. STM_EVAL_LEDOn(LED4);
    23. /* wait for 1s */
    24. Delay(1000);
    26. /* Turn off LED after 1s each time User button is pressed */
    27. STM_EVAL_LEDOff(LED4);
    28. }
    29. }
    30. }
    Display All


    Linker options :

    Source Code

    1. "-Wl,-Map=${BuildArtifactFileBaseName}.map" -T"..\stm32_flash.ld" -Wl,--gc-sections -mthumb -mcpu=cortex-m3 --specs=rdimon.specs -Wl,--start-group -lgcc -lc -lm -lrdimon -Wl,--end-group


    as indicated in the GNU ARM Embedded readme.txt (launchpadlibrarian.net/143625601/readme.txt)

    GDB command :

    Source Code

    1. arm-none-eabi-gdb


    Initialization commands :

    Source Code

    1. target remote localhost:2331
    2. monitor interface SWD
    3. monitor endian little
    4. monitor speed auto
    5. monitor semihosting enable
    6. monitor flash device = STM32F207ZG
    7. monitor flash download = 1
    8. monitor reset

    I get these errors in the J-Link GDB Server log (v4.76a)

    Source Code

    1. WARNING: Semihosting command SYS_FLEN failed. Handle is 0.
    2. WARNING: Semihosting command SYS_WRITE failed. Handle is 0.
    3. WARNING: Semihosting command SYS_WRITE failed. Handle is 0.
    4. WARNING: Semihosting command SYS_WRITE failed. Handle is 0.


    I'm almost sure I missed something very basic...

    Can you help ?

    Thanks !

    The post was edited 3 times, last by Efcis ().

  • Hi memphiscz

    Actually, the error disappeared after specifying

    Source Code

    1. extern void initialise_monitor_handles(void);


    and calling

    Source Code

    1. initialise_monitor_handles();


    at start of the main function.

    But I still can't see my "Hello World !" anywhere ?! The application console in Eclipse is empty.

    Did I miss something obvious ?

  • Hi,

    And just for info, i think that Segger`s semihosting dont support write, only read.

    The current version (V4.76d) should also support writing for semihosting.
    Moreover, it also supports the GDB File I/O extensions for users who prefer getting/sending semihosting data directly from/via the GDB window.


    Best regards
    Alex
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