topic Re: Porting AN4368 to K70 in Kinetis Microcontrollers

Porting AN4368 to K70

mrupp_viatechno — Sat, 01 Sep 2012 11:03:53 GMT

I am attempting to create a bootloader, for a K70, using the ideas in AN4368. My problem is with the flash driver supplied. In particular the routine 'Flash_ByteProgram". It is returning a 'Flash access error'. In flash_FTFL.h the flash write command is defined as 0x06 using '#define FlashCmd_ProgramLongWord 0x06'. However looking at the K70 reference manual there is no 0x06 command. See section 30.4.10.2. There is a 'Program Phrase' command that writes eight bytes. Is the flash driver supplied with AN4368 incorrect? Is a corrected one available?

I have attached both flash_FTFL.c and flash_FTFL.h that were supplied with AN4368.

Re: Porting AN4368 to K70

mjbcswitzerland — Sun, 02 Sep 2012 02:47:49 GMT

I can't help with the application note code but older code's FLASH driver can be adapted to the devices with FPU by respecting the following points:

- the FLASH granularity (smallest block that can be erased) is 4k rather than 2k

- writes to flash have to be done in 'phrases' of 8 bytes rather than as long words

The driver changes are quite easy but there can be a bigger impact on the higher layers which may neen adaptation to work with the larger write/erase size restrictions.

However not only the Flash is different - the PLL setup needs to be calculated differently since the PLL works internally twices as fast.

If using the DMA controller this is a little different (it has groups that need to be set up correctly to avoid conflicts).

The USB source clock set up is a little different.

Therefore you may find that the application note in question requires a more thorough K70 target configuration review before it is completely operation.

Regards

Mark

P,S. I have K70 loaders for UART (S-rec), USB CDC device, USB-MSD device, SD card and Ethernet (FTP, TFT or Web server) but unfortunately not for a USB-stick....

Re: Porting AN4368 to K70

PaoloRenzo — Mon, 03 Sep 2012 22:41:57 GMT

Look at AN4370SW. It includes functional routines for K70 flash configuration

Hope this helps

Re: Porting AN4368 to K70

mrupp_viatechno — Wed, 05 Sep 2012 20:59:41 GMT

I am using MQX which handles the PLL and DMA.

Re: Porting AN4368 to K70

mrupp_viatechno — Wed, 05 Sep 2012 21:23:31 GMT

The code in AN4370SW uses the correct Flash command (0x07) but it still has bugs. It only works when the number of data bytes in the S record is an integral number of 'phrases'. The default in CodeWarrior 10.2 does not have this. I needed to change the projects ARM Linker Output so that the 'Max S-Record Length' is 84. It defaults to 80 which results in 9.5 phrases per S record. Also, the address in the S record must be on an 8-byte boundary (not four as tested in the program).

Changing the 'Max S-Record Length' to 84 created a file where each record had an integral number of 'phrases' and the address was on 8-byte boundaries. Programming the flash then worked.

However, I am worried about the future. Specified the 'Max S-Record Length' as 84; but did not specify a minimum. What's to stop CW 10.3 from using 80 regardless of the Max setting. Also I did not see any way to tell the linker to create S records that have addresses on 8-byte boundaries. But this is a problem for another day.

Thanks for your help.

Re: Porting AN4368 to K70

squadmcu — Sun, 09 Sep 2012 23:50:50 GMT

The Documentation for Kinetis K70 (Graphic LCD 120/150 MHz MCUs) can be found at "K70_120 Product Summary Page", Freescale folks are constantly uploading new resources (like ANs) to help you all.

Definitely, that page deserves a bookmark