topic Re: RS-485 Bootloader for Kinetis K60 in Kinetis Microcontrollers

RS-485 Bootloader for Kinetis K60

drb — Fri, 17 Feb 2012 09:34:02 GMT

Hello,

I would like to develop an RS-485 bootloader for Kinetis K60. Any reference document/software to be able to help me get started on the bootloader firmware development?

thank you so much

Re: RS-485 Bootloader for Kinetis K60

mjbcswitzerland — Fri, 17 Feb 2012 20:56:44 GMT

What are the special requirements of RS485 (is it bus oriented?)

For UART you can look at the uTasker project's serial loader - this supports SREC loading via any UART as well as USB (and from SD cards).

http://www.utasker.com/docs/uTasker/uTaskerSerialLoader.PDF

There are additional enryption possibilites as discussed here: http://www.utasker.com/docs/uTasker/uTaskerSecureSREC.pdf

Regards

Mark

Re: RS-485 Bootloader for Kinetis K60

J2MEJediMaster — Fri, 17 Feb 2012 21:26:55 GMT

There are number of Freescale Kinetis-specific application notes posted https://community.freescale.com/message/102108#102108 on this board that discuss bootloader implementations. Two in particular are AN4367 and AN4368. (They're located far down the list.)

---Tom

Re: RS-485 Bootloader for Kinetis K60

LuisCasado — Fri, 17 Feb 2012 22:36:48 GMT

Hello,

Check AN2295 bootloader:

https://community.freescale.com/message/97604#97604

Best Regards,

Luis

Re: RS-485 Bootloader for Kinetis K60

albertolubeiro — Wed, 23 Oct 2013 15:39:57 GMT

Hi luis,

I have checked AN2295.

I am working with K60 and CW10.2. I have copied the function "JumpToUserApplication" to my proyect in order to jump to an absolut address.

First off all, when i build the code, I get some errors and I eliminate these errors doing this:

asm static void JumpToUserApplication(_SOFT_U32BITS userStartup)

{

/* set up stack pointer */

LDR r13, [r0];

/* jump to application reset vector */

ADD r0,r0,#0x04;

LDR r0, [r0];

BX r0;

}

The problem is that when I pass the address to this function, it branches to a diferent address.

Can you help me?

Thanks and best regards

Hi Luis, I have just seen your response in the other thread. I´m going to test it and will tell you.

Thanks again!!

Re: RS-485 Bootloader for Kinetis K60

LuisCasado — Wed, 23 Oct 2013 16:05:32 GMT

Hi,

What is the content of R0 before the BX instruction?

Luis