Kinetis Microcontrollers中的主题 Re: Flash procedure of the MKL02Z32VFM4 processor using Rx/Tx connection.

Flash procedure of the MKL02Z32VFM4 processor using Rx/Tx connection.

edwardkäding — Thu, 13 Feb 2014 14:55:20 GMT

Hello Freescale Community,

I am new in this forum and appologise if this question has already been answered.

The customer support told me to write my questions in this forum so here I am.

I have finished programming the Freescale MKL02Z32VFM4 processor and also set up the Rx/Tx axynchronous serial communication with the main CPU (continous transfer and not Master / Slave).

In future we would like to be able to flash the KL02 MCU using the the main CPU.

Is it possible to flash the KL02-CPU using the same UART connection? Or do we need a second UART connection? Is it possible at all?

What is the flash procedure in general? Do we have to modify the internal programm when a flash command is set in motion or does it stop automatically etc..

Basically, all the information to implement a working flash procedure.

I thank everyone in advance who can help me.

Edward.

Re: Flash procedure of the MKL02Z32VFM4 processor using Rx/Tx connection.

Paul_Tian — Tue, 18 Feb 2014 09:32:21 GMT

Hi, Edward

Yes, you no need to use another UART channel.

The general process as below.

Main MCU send change flash command -> KL02 write a fixed byte a special value -> software reset -> enter bootloader mode -> program flash -> change that fixed byte to 0x00 -> software reset -> normal run mode -> UART communication.

Hope my reply can help you.

Best Regards

Paul

Re: Flash procedure of the MKL02Z32VFM4 processor using Rx/Tx connection.

edwardkäding — Tue, 04 Mar 2014 08:03:45 GMT

Hi, Paul.

Thank you for your answer. I did not have the time to answer you recently.

Sadly it does not help me a noob like me at all. Therfore I have lots of open questions for (I apologise in advance!).

Main MCU send change flash command: - No problem there.

KL02 write a fixed byte a special value:

- what is the "fixed byte"?

- what is meant by special value and write it where?

Software Reset:

- I have been trying to figure this out but do not know which register I have to write so the SYSRESETREQ is set ... ?

Enter Bootloader mode:

- How can I enter this mode?

I am very sorry for all the questions, but I have to start from scratch.

Regards,

Edward.

Re: Flash procedure of the MKL02Z32VFM4 processor using Rx/Tx connection.

Paul_Tian — Wed, 05 Mar 2014 02:36:54 GMT

Hi, Edward

Please see my comment below.

KL02 write a fixed byte a special value:

- what is the "fixed byte"?

I think you can set to 0xAA

- what is meant by special value and write it where?

One byte in flash where you do not place any code or other data.

Software Reset:

- I have been trying to figure this out but do not know which register I have to write so the SYSRESETREQ is set ... ?

You can reference following code.

#define NVIC_SystemReset()

{

SCB_AIRCR = SCB_AIRCR_VECTKEY(0x5FA)| SCB_AIRCR_SYSRESETREQ_MASK;

while(1);

}

Enter Bootloader mode:

- How can I enter this mode?

You can reference this application note. http://cache.freescale.com/files/microcontrollers/doc/app_note/AN2295.pdf

Hope my reply can help you.

Best Regards

Paul

Re: Flash procedure of the MKL02Z32VFM4 processor using Rx/Tx connection.

edwardkäding — Wed, 05 Mar 2014 06:28:34 GMT

Hello Paul,

Thank you for your very quick response.

I hope I can take a look at your advices. I still have 3 other projects which I am working at.

Have a nice week,

Edward.

Re: Flash procedure of the MKL02Z32VFM4 processor using Rx/Tx connection.

Paul_Tian — Wed, 05 Mar 2014 08:37:47 GMT

Hi, Edward

OK. No problem. Any questions, we can discuss in community.

Best Regards

Paul