Switch from NRF51822 QFAA to QFAC

[Hugues Bernet-Rollande]

Hi,

I wrote a functional firmware which has been tested and valited on a nrf51822 QFAA, but unfortunately I need more RAM to fit the requirements of my application so I switched the chip to nRF51822 QFAC. I currently worked on eclipse with mbed for the development of the firmware. What do I have to do in the settings of the code and/or compiler to make the code run on QFAC and to make the compiler understand that I have on my chip 32KB of RAM and not 16KB anymore.

PS : I use softdevice S110 7.1.0

Best regards,

Hugues

[Susheel Nuguru]

The package is pin and flash compatible. Only RAM size is changed. So in Keil you just need to change the RAM settings to

and in your case for gcc you use below in .ld file

/* Linker script to configure memory regions. */

MEMORY
{
  FLASH (rx) : ORIGIN = 0x00016000, LENGTH = 0x29000 
  RAM (rwx) :  ORIGIN = 0x20002000, LENGTH = 0x6000 
}

[Hugues Bernet-Rollande]

Ok thank you for your quick answer Aryan :) My current memory configuration is the following :

MEMORY
{
  FLASH (rx) : ORIGIN = 0x00016000, LENGTH = 0x2A000
  RAM (rwx) :  ORIGIN = 0x20002000, LENGTH = 0x2000
}

So I just have to switch 0x2000 to 0x6000, correct ? Despite the fact that the flash length is 0x2A000 on my settings, I don't have to change it ?

Hugues

[Susheel Nuguru]

change 0x2A000 to 0x29000. It will effect if you have DFU bootloader.

[Hugues Bernet-Rollande]

Ok, you mean I have to change it to 0x29000 ? It looks Ok for compiling with your configuration, I will flash it when I receive the PCB this afternoon, thanks for your help !