NIOS II memory writes failing - values being input at wrong addresses (I2C opencore)

Thanks for your reply.

I've set up signal tap to try trigger on write (Compiling now).

I'm using:

# define IOWR(base,offset,value) __builtin_stwio ((unsigned int*)BASE + OFFSET, (DATA));

IOWR(I2C_MASTER_BASE, 5, 0x1D);

to write to the registers which I think is working because it works fine for some registers and with simple PIO tasks. I am confident that 0x9866160 is the correct address as it is taken from the SOPC builder and based on the fact that when I initiate values into the registers in the VHDL I can see them at this address in the debug window.

I am sure the FPGA is configured in the correct order as I've been working on it for several days now so it's been programmed many times now. However, I am re-compiling right now so will make 100% sure the order is correct.

Thanks for your time, i'll update the situation when I see if I can trigger on write.