TWRK60F120M : cpu runs only in debug mode

[angelodattilo]

Hi

I'm working with TWRK60F120M. I'm using eclipse IDE, with gcc compiler, GDB + openocd for debugging.

My debug interface is osbdm.

I wrote a simple code  and I flash it into the device. The code runs perfectly.

After that I powered off the device e re -powerd it on. The code doesn't run.

I saw with the oscilloscope the reset-b signal and it is floating between 400mV and 1.88V

I think that the watchdog resets the cpu (because it is enabled by default ). My code disables watchdog at startup, but

I think that after a poweron it fails to execute wdog disable because it is resetted before.

I read a lot of discussion about this problem, that can be caused by  several reasons

I saw with the oscilloscope the EZP_CS signal and it is high (the device doesn't enter in EzPort mode).

Do you have any suggestions?

[ZhangJennie]

Hi Angelo,

some users met similar problem because they download the code in RAM but not FLASH. Please check this point on your side also.

I also suggest you connect the board with "Attach".this will connect the board without erasing flash. then check flash memory if code is correctly programmed.

Have a great day,
Zhang Jun

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[angelodattilo]

Hi Jennie

thanks for your reply.

I had already tried the attempt that you suggested ( using OPENOCD for flash memory dump)

The code has been downlaoded in flash, and after poweron, I have noticed that flash is programmed , but the code doesn't run.

Maybe there are some problems with my compiler options (This is my compiler string :arm-none-eabi-gcc -std=c99 -O0 -g -c -fmessage-length=0  -mcpu=cortex-m4   -mthumb  -ffunction-sections -fdata-sections -ewl_noio).

I have also noticed that I can't read flash memory from address 0x100_0000(MDM-AP Status Register) ,but I don't know if this is a normal work, because this is the first time I work with Freescale devices.

Executing flash memory dump I have also noticed that device is not locked (addrees 0x40c =0xFE)

Do you you have any further suggestion ?

Thanks for supporting me

Angelo