topic Re: Confusion regarding thread mode in MQX Software Solutions

Confusion regarding thread mode

reubennoronha — Mon, 25 May 2015 11:30:00 GMT

Hello All,

I've written a bootloader for my custom board with a Kinetis K61.

The bootloader runs on MQX and has USB + MFS functionality(I extended the mfs_usb example to include more code)

The application(formware to be upgraded) too has an OS(RTXC)

The bootloader writes the Application to DDR, then jumps to a specific location in the DDR and starts executing from there.

The problem I'm facing is that the application code contains the following 2 lines of code in a function called Init_OS() :

#define THREAD_PRIVELEGED (0ul << 0)

#define TSTACK_PROCESS (1ul << 1)

Q__set_PSP(Q__get_MSP() );

Q__set_CONTROL(THREAD_PRIVILEGED | TSTACK_PROCESS);

On exiting the function that contains the above code, I get an exception(either undefined instruction or usage fault)

If I comment out these 2 lines, there are no issues faced.

1) What could be the issue ?

2) Is it possible that MQX(which is in the bootloader) has already initialized the thread mode and hence wont allow the application OS to make changes ?

3) Is there a work around ?

Re: Confusion regarding thread mode

soledad — Wed, 03 Jun 2015 22:15:56 GMT

Hello Reuben ,

Which MQX version are you using??

Regards

Soledad

Re: Confusion regarding thread mode

reubennoronha — Thu, 04 Jun 2015 04:56:27 GMT

We're using MQX 4.1

Would you be kind enough to answer my doubts above ?

Re: Confusion regarding thread mode

soledad — Mon, 08 Jun 2015 22:21:06 GMT

Hello Reuben,

Please check the below thread

In MQX are all the threads in privileged mode ? or do we need to enable them in privilege mode

Have a great day,
Sol

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