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Production trim data in NV flash.

Question asked by Max Vilimpoc on Dec 23, 2016
Latest reply on Dec 29, 2016 by Jorge Antonio Alcala Vazquez

Looking into the connectivity examples like the connectivity_test_genfsk_frdmkw41z (for the KW41Z), there are undocumented references to trim data stored in flash memory (for example: in hardware_init.c).

 

This is read from flash via calls like:

NV_ReadHWParameters(&gHardwareParameters)

 

which reads data from locations specified by FREESCALE_PROD_DATA_BASE_ADDR, which is specified in the linker file as:

FREESCALE_PROD_DATA_BASE_ADDR = ((0x0007FFFF) - ( 2 * 1024 ) + 1);

 

So the questions are:

  1. Does NXP plan to have a specific location in flash where production trim data (as measured by NXP at the factory) will be written?
  2. Could NXP provide reference documentation on the trim data structures it uses for its various microcontroller families?
  3. Could NXP specify a trim area in flash at a much lower address? i.e. for many Kinetis microcontrollers, location 0x410 is already used for the Flash Configuration Field (FCF), so it might be a convenient convention to store trim data from 0x480 - 0x500.

 

Any improvements in these three areas, particularly uniform answers to questions 1 and 2, would be greatly appreciated.

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