RTOS/AM5728: Random() in TI RTOS result in DATA ABORT

Hello Tony,

I assume there was no compile/linking warning, what is the TI-RTOS version you are using? Do you have a small project you can share to demonstrate the problem?

Please note due to the US holidays, on this particular E2E thread, our response may get delayed until the week of Jan 2, 2019.

Warmest Wishes for Happy Holidays and a Happy New Year!

best regards,
David Zhou

Hi Tony,

Where are you getting the function random()? Have you looked at this to help debug exceptions: training.ti.com/debugging-common-application-issues-ti-rtos

Todd

David,

I reproduce it with a example of PDK: GPIO_LedBlink_idkAM572x_armTestProject, just add random() call in main().

customer call it in task got the same result.

and customer said, if don't use RTOS, call random() is OK.

Can you look in the mapfile to see where random() is coming from? Did you look at the training to see if that would help?

I attach the map file. I looked at the .pdf, seems not help for my question

GPIO_LedBlink_idkAM572x_armTestProject.zip

Hi Tony,

Have you tried using random_r() instead?

It is the multi-threaded version of random().

Regards,

- Rob

Robert Tivy said:

Hi Tony,

Have you tried using random_r() instead?

It is the multi-threaded version of random().

Regards,

- Rob

random_r() can't build through.

**** Build of configuration Debug for project GPIO_LedBlink_idkAM572x_armTestProject ****

"C:\\ti\\ccsv7\\utils\\bin\\gmake" -k -j 4 all -O

'Building file: "C:/ti/pdk_am57xx_1_0_11/packages/ti/drv/gpio/test/led_blink/src/main_led_blink.c"'
'Invoking: GNU Compiler'
"C:/ti/gcc-arm-none-eabi-6-2017-q1-update/bin/arm-none-eabi-gcc.exe" -c -mcpu=cortex-a15 -mtune=cortex-a15 -marm -mfloat-abi=hard -Dam5728 -Dcore0 -DSOC_AM572x -DidkAM572x -I"C:/ti/pdk_am57xx_1_0_11/packages/MyExampleProjects/GPIO_LedBlink_idkAM572x_armTestProject" -I"C:/ti/gcc-arm-none-eabi-6-2017-q1-update/arm-none-eabi/include/newlib-nano" -I"C:/ti/pdk_am57xx_1_0_11/packages/ti/drv/gpio" -I"C:/ti/gcc-arm-none-eabi-6-2017-q1-update/arm-none-eabi/include" -g -gdwarf-3 -gstrict-dwarf -Wall -c -finstrument-functions -MMD -MP -MMD -MP -MF"main_led_blink.d" -MT"main_led_blink.o" @"configPkg/compiler.opt" -o"main_led_blink.o" "C:/ti/pdk_am57xx_1_0_11/packages/ti/drv/gpio/test/led_blink/src/main_led_blink.c"
C:/ti/pdk_am57xx_1_0_11/packages/ti/drv/gpio/test/led_blink/src/main_led_blink.c: In function 'main':
C:/ti/pdk_am57xx_1_0_11/packages/ti/drv/gpio/test/led_blink/src/main_led_blink.c:230:12: warning: implicit declaration of function 'random_r' [-Wimplicit-function-declaration]
temp = random_r(3);
^~~~~~~~
C:/ti/pdk_am57xx_1_0_11/packages/ti/drv/gpio/test/led_blink/src/main_led_blink.c:227:10: warning: variable 'temp' set but not used [-Wunused-but-set-variable]
int temp;
^~~~
'Finished building: "C:/ti/pdk_am57xx_1_0_11/packages/ti/drv/gpio/test/led_blink/src/main_led_blink.c"'

'Building target: "GPIO_LedBlink_idkAM572x_armTestProject.out"'
'Invoking: GNU Linker'
"C:/ti/gcc-arm-none-eabi-6-2017-q1-update/bin/arm-none-eabi-gcc.exe" -mtune=cortex-a15 -marm -Dam5728 -Dcore0 -DSOC_AM572x -DidkAM572x -g -gdwarf-3 -gstrict-dwarf -Wall -finstrument-functions -MMD -MP -mfloat-abi=hard -Wl,-Map,"GPIO_LedBlink_idkAM572x_armTestProject.map" -nostartfiles -static -Wl,--gc-sections -L"C:/ti/bios_6_52_00_12/packages/gnu/targets/arm/libs/install-native/arm-none-eabi/lib/hard" -Wl,--defsym,CORE0=1 -Wl,--defsym,STACKSIZE=0x10000 -Wl,--defsym,HEAPSIZE=0x400 --specs=nano.specs -o"GPIO_LedBlink_idkAM572x_armTestProject.out" "./GPIO_idkAM572x_board.o" "./GPIO_log.o" "./GPIO_soc.o" "./UART_soc.o" "./main_led_blink.o" -Wl,-T"configPkg/linker.cmd" -Wl,--start-group -lrdimon -lgcc -lm -lnosys -lc -Wl,--end-group
makefile:150: recipe for target 'GPIO_LedBlink_idkAM572x_armTestProject.out' failed
./main_led_blink.o: In function `main':
C:/ti/pdk_am57xx_1_0_11/packages/ti/drv/gpio/test/led_blink/src/main_led_blink.c:230: undefined reference to `random_r'
collect2.exe: error: ld returned 1 exit status
gmake[1]: *** [GPIO_LedBlink_idkAM572x_armTestProject.out] Error 1
gmake: *** [all] Error 2
makefile:146: recipe for target 'all' failed

**** Build Finished ****

"Is introducing the random() API the only chnage that you made to the project ?"

random() call in TI RTOS result in data abort.
srand() rand() call in TI RTOS result in data abort.
random_r() can't build through in TI RTOS.

Is there any alternative to this situation?

Best regards.