Loading software to different versions of nrf51822

[samo]

Hi everyone,

We have one weird problem with loading the program to the two different variants of nrf51822 chip via nrfgo Studio. We would like to change nrf51822AA chip to nrf51822AB chip which has smaller flash memory space (128kB). We would like to do this because the latter one is cheaper for mass production. The program (softdevice S110 8.0.0 and + our program-SDK.10.0.0) works very well when the nrf51822AA chip is used, but I do not know why this is not happen when I use nrf51822AB chip. To be clear, the softdevice needs 96kB which means that the remaining part can be less than 32kB. Our program occupies the following memory sizes: code:29360; R0-460;RW-260; ZI-5332. According to the following instructions (devzone.nordicsemi.com/.../), it is evident that the size of our program is less than 32kB. I do not know what else could be wrong with the program because the only difference between them is size of flash memory. It is worth mentioning the fact that when the program is loaded on nrf51822AB via nrfgo Studio everything goes smoothly but when I press the button "verify" I get the message: it is not done successfully. I will be really grateful for any advice.

Best regards

Samo

[samo]

The application does not work (the central device does not see nrf51822). I changed all settings IROM1: 0x18000; 0x8000 and IRAM1: 0x20002000; 0x2000. It is worth mentioning that if the program is higher than 28Kb then the application does not work (the current is a very high a few mA) otherwise everything is good. Is it possible that the problem lies in the fact that I have four services and each of them has approximately four characteristics? At the same time, one characteristic is long 300bytes maybe these facts need more space in flash. If so how I can find out these values.