nrf51822_CEAA RAM limitation

[Aymen Rejeb]

Hi All,

I'm trying to test the ble_app_hrs_rscs_relay example on an nRF51822 (256 Ko flash / 16 Ko RAM) with the softdevice s130 but unfortunately the program is not being run. Compiling with Keil gives the following results:

Memory mapping is as following:

I'm using default Stack/Heap configuration in the startup code:

Please note, this same example is running perfectly on nrf51422 on the Nordic nRF51-DK (PCA10028 V1.1.0).

Could you please confirm that this issue is because of insufficient RAM size?

Many thanks in advance.

[Wojtek]

What clock source are you using? what does it mean "program is not being run"? you get hardfault somewhere or what?

[Aymen Rejeb]

I'm using the ISP130301 which embeds an nRF51822_CEAA, and as you can see in the datasheet both 16 MHz and 32.768 kHz clocks are integrated. The example uses the external low frequency clock 32.768 KHz as following: SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, NULL); // LFCLK crystal oscillator 20 PPM accuracy. Actually, I don't think it is a hardfault, because when debugging (with Keil) the main function is not being even called!

[Nguyen Hoan Hoang]

Yes, it is ram size. Your firmware requires 8k ram, while your device only has 6K ram left. Move some of your global variables that are fixed into Flash mem to free up some ram.

[Øyvind Karlsen]

Some RAM saving measures are discussed in this blogpost.

[Aymen Rejeb]

Thank you all guys :) I really appreciate your support!