Writing to a flash page using nvm in samd21

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bop123
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Posted by bop123: Mon. Aug 13, 2018 - 01:18 AM
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Hi,

 

Here's what I'm trying to do-

1. Load hex file of bootloader as is (taken from http://www.microchip.com/wwwAppN...) 

2. Use example project of NVM as an application.

3. Load the .bin file of application code at 0x2000.

 

Now, the problem is why NVM is writing starting from address 0x00000000 and also giving one value to whole page. Please check attachment.

 

NOTE- I have tried

1. Insert command -Wl,--section-start=.text=0x2000 in Toolchain

2. In samd21j18a_flash.ld, change rom (rx)  : ORIGIN = 0x00000000, LENGTH = 0x00040000 to rom      (rx)  : ORIGIN = 0x00002000, LENGTH = 0x00040000

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This topic has a solution.

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Atmel SMART ARM-based MCUs and MPUs, Atmel Cortex-M MCUs, solved
Last Edited: Fri. Aug 17, 2018 - 04:56 PM
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Lajon
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Posted by Lajon: Mon. Aug 13, 2018 - 09:01 AM
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How do you check this (i.e., where are the memory dump pictures from)? If from debugging what are you debugging (you would have to ensure the flash is not rewritten by the debugging session).

/Lars

 

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PhillyNJ
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Posted by PhillyNJ: Mon. Aug 13, 2018 - 11:36 PM
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bop123 wrote:
2. In samd21j18a_flash.ld,

change rom (rx)  : ORIGIN = 0x00000000, LENGTH = 0x00040000

to 

 

rom      (rx)  : ORIGIN = 0x00002000, LENGTH = 0x00040000

 

This doesn't look right. The length needs to be  (0x00040000 - 0x00002000) = 0x3E000

 

rom      (rx)  : ORIGIN = 0x00002000, LENGTH = 0x0003E000

 

 

 

"When all else fails, read the directions"

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bop123
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Posted by bop123: Fri. Aug 17, 2018 - 04:47 PM
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Thankyou all!! It worked..

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PhillyNJ
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Posted by PhillyNJ: Fri. Aug 17, 2018 - 04:49 PM
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bop123 wrote:
Thankyou all!! It worked..

What worked?  Please either mark the solution or provide the solution so it may help someone else in the future yes

"When all else fails, read the directions"

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awneil
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Posted by awneil: Fri. Aug 17, 2018 - 04:52 PM (Reply to #5)
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PhillyNJ wrote:
mark the solution

If you need help with that, see Tip #5

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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bop123
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This reply has been marked as the solution. 
Posted by bop123: Fri. Aug 17, 2018 - 04:55 PM
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I just used -Wl,--section-start=.text=0x2000 and my code was working since the beginning, I was just checking in the wrong place.

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