Question about RAM

[nejcokle]

Hello,

I have a question about RAM usage. If i use chip with 16kB RAM, and if i use s130 (which uses 10kB RAM) and bootloader (which uses 4kB of ram) i only get left with 2kB of RAM for my application, right?

Best regards

[John]

I think the bootloader and the application could use the same RAM space as they run at different times. So, I think you could get 6K.

[bjorn-spockeli]

No, since the Bootloader and Application will never be running at the same time. The device will perform a Soft Reset when branching from the Application to the Bootloader and vice versa, i.e. calling the ResetHandler which will load the variables needed by the bootloader/application and overwritting the old ones.

Thus, you will have 6kB RAM - 0x80 bytes (NoInit Section) = 0x1780 bytes RAM that the application can use.

-Bjørn

[John]

I forgot about the NoInit section!

[nejcokle]

Ok, thanks for your help :)

[bjorn-spockeli]

Happy to help :) I would appreciate if you could mark the answer as correct by clicking on the check-mark to the left of the answer.