how to define target configuration in keil

[Amit Varshney]

Hi, I have nrf51822QFAA series. I am using S110 for softdevice which takes 96KB. My current program size is Code=31908 RO-data=512 RW-data=312 ZI-data=8360. I want to know what will be the target configuration in keil, so that my code will run on this series.

My current configuration is shown in the picture attached...

[Roger Clark]

Assuming the values you quoted are correct...

The IROM1 values you entered look correct, but the IRAM1 value is wrong, because 0x4000 is the total RAM size, not the size available to the application

If the SD is taking 0x2000 of RAM then the size of RAM left to the application will be 0x4000 - 0x2000 = 0x2000

[Amit Varshney]

My application still not running after changing IRAM1 value feom 0x4000 to 0x2000. I can run this applucation in nRF51822QFAC series which has RAM of 32KB. Is that one the issue which causing problem to me because QFAA series has 16KB Ram only.

[Roger Clark]

Have you checked if your application will actually fit in 16k of RAM ?

Some examples will not run on the QFAA (16k) version.

I'd either attach a debug terminal via serial (e.g. use USB to Serial converter and set NRF_LOG_ENABLED 1

Or use the Segger debug terminal, or perhaps just run the application in the debugger and see if it catches any memory exceptions etc

[Sigurd]

The nrf51822QFAA has 16kB RAM. The RAM usage for your application code is ZI-data + RW-data = 8.46875 kB. The SoftDevice uses 8kB, so the total RAM usage is 16.46875kB…

[Amit Varshney]

Thanks Sigurd for explaining to me that how to calculate RAM size. I have reduced my HEAP and Stack memory. Now my uses RAM 6.4375 KB and my application is running perfectly.