Putting Code Into RAM

RE: Putting Code Into RAM

Amanda Hsieh — Thu, 09 Sep 2021 12:48:45 GMT

[quote user="Burnie Barren"]I cannot give them the same address if I am using a SoftDevice, right?[/quote]

Correct.

[quote user="Burnie Barren"]In my case, minimum RAM is 0x20001628 and flash start is 0x26000.[/quote]

If you are using s132_nrf52_7.2.0, the minimum required memory is 5.6 kB (0x1668 bytes). So, the RAM start is 0x20001668. See release-note under nRF5_SDK_17.0.2\components\softdevice\s132\doc

-Amanda

RE: Putting Code Into RAM

Burnie Barren — Thu, 09 Sep 2021 12:19:58 GMT

So just asking to verify, I cannot give them the same address if I am using a SoftDevice, right? In my case, minimum RAM is 0x20001628 and flash start is 0x26000.

RE: Putting Code Into RAM

Amanda Hsieh — Thu, 09 Sep 2021 12:05:45 GMT

If your Application uses a SoftDevice the start address for the FLASH memory must be set to the correct value for the corresponding SoftDevice, otherwise, the Application will not run. This is because the SoftDevice expects the Application to start at one specific address. The RAM start address on the other hand can vary depending on the number of features used in the SoftDevice, but it has always the lowest possible starting address.

-Amanda

RE: Putting Code Into RAM

Burnie Barren — Thu, 09 Sep 2021 11:28:19 GMT

I had checked that link but could not be sure, is it enough that I make RAM start address and the flash start address the same to run the code in RAM?

RE: Putting Code Into RAM

Amanda Hsieh — Thu, 09 Sep 2021 11:09:14 GMT

Hi Burnie,

Have a look at this tutorial Adjustment of RAM and Flash memory. You also can refer to the default setting of the ble_app_beacon Keil project:

Regards,
Amanda