How to compile SDK13 examples for nrf52832

[zolotiyeruki]

For the last few months, I've been building code and testing it on an nRF52840 PDK. Our production hardware, however, will use the nRF52832, and so I need to compile my code against a different target, and program it on a custom board.

I tried to start simple: the blinky example. I can get the project to compile by replacing "52840" in the Makefile with "52832", and adding the following two lines in their respective sections:

CFLAGS += -DNRF52
ASMFLAGS += -DNRF52

Also, these lines were modified to point at the generic nrf52 rather than nrf52840 files:

SRC_FILES += \
 ...
  $(SDK_ROOT)/components/toolchain/gcc/gcc_startup_nrf52.S \
  $(SDK_ROOT)/components/toolchain/system_nrf52.c \

With those changes, the example compiles just fine, but when I program it to the custom board, nothing visible happens. If I try to debug it in Eclipse, it hardfaults:

Thread #1 57005 (Suspended : Signal : SIGTRAP:Trace/breakpoint trap)	
	HardFault_Handler() at 0x1792	
	<signal handler called>() at 0xfffffff9	
	__isr_vector() at 0x0	

Is there a tutorial, or some sort of instructions, for successfully running the examples in the SDK on the nRF52832? I feel like I'm missing something simple.

[zolotiyeruki]

I figured it out! At least for the blinky example above, I needed to modify the linker script included in the project (blinky_gcc_nrf52.ld) to reflect the smaller RAM (64k instead of 256k) and flash (512k instead of 1M) sizes on the 52832:

MEMORY
{
  FLASH (rx) : ORIGIN = 0x0, LENGTH = 0x80000
  RAM (rwx) :  ORIGIN = 0x20000000, LENGTH = 0x10000
}