Difference in compiling from Keil or makefile

[justPassingBy]

Hello everyone,

Currently we're writing a small program for the NRF52 (PCA10040), which has to communicate via SPI to an IMU (MPU-9250). The code is working correctly, because when my colleague compiles it using Keil everything is working as expected. However, when I compile and flash it with a makefile (we basically took the Blinky-example and replaced the main.c with our own code), it does not. We do get a few bytes over the SPI, but these aren't the right ones as the IMU is not responding. No softdevice is used in any case. What issues could be causing this?

With kind regards,

[endnode]

The fact that something compiles and links doesn't mean all is set correctly. Keil and GCC (Makefile) are using different start-up code and linker script mechanism (LD in GCC). Any specific difference when you compare MAP files generated during compilation? (all modules should be present in both, also sequence and sizes will differ)

[FormerMember]

This blog post compares Keil, IAR, and GCC. The blog post is a little old, but I would think it still gives an okay overall picture.