nRF51822_xxAC, split RAM into 2 regions

[Zhiqun Zhang]

Hi

I'm doing some S/W based on nRF51822_xxAC. I want to split RAM into 2 regions, as following:

+-------------+ 0x20008000
|__ __ _ __ |
|APP ZONE2 |
+-------------+ 0x20004000
| __ _ _ _ _ |
| STACK |stack size=0x1000
|_ __ _ __ __|
| HEAP |heap size=0
+-------------+
|APP ZONE1 |
+-------------+0x20002000
| S110 8.0.0 |
+-------------+0x20000000

Please see if the correct? Safe for stack overflow or hardhalt?

[bjorn-spockeli]

Hi Zhiqun,

there are no safety mechanisms in our SoftDevices/SKDs so how "safe" the configuration is against stack overflow will depend on how much RAM your application uses and how often the SoftDevice is invoked. Remember that the SoftDevice and the application shares the stack.

Are you using Keil or GCC to compile your application?

Is there a specific reason to why you need to split the RAM into two application sections?

Bjørn

[Zhiqun Zhang]

Yes, I'm using S110 v8. I split the whole RAM into two regions. The first region APP_ZONE1's start address is 0x00018000, the second region APP_ZONE2's scatter file is as the above.

APP_ZONE2 will be used for customer's self-defined codes ram. For example, after power-up and some init codes of main() in APP_ZONE1, software will jump to 0x20100 to run customer's self-defined codes.