Hello, some time ago I started to play with CortexM4,
I bought a Discovery Board with a STM32F407VG in order to be programmed with uVision from Keil.
I am developing a project where the money is very restricted, that's why I was using a free licence from Keil.
Everything was working fine until I exceed the program size of 32KB(now I need to pay the license if I want to continue for this way).
I started to look for other option, and gnu-arm-none-eabi with Eclipse seems to be the answer.
The big problem are the peripherals: I need to use UART(to output message on debugging time using the famous "printf()") and SDIO to log some variables from different sensors that require I2C.
In general terms: what are the aspects that I need to consider when I switch those IDEs: from uVision to "System Workbench for STM32" known as SW4STM32.
The problem is in your Makefile; you need to add a library, which provides those functions.
Fortunately, I've read somewhere on the net, that Eclipse provides an easy interface to add libraries.
From reading about Eclipse, I understand that it provides a way for you to receive the output from printf in the debugger.
This is probably what you would prefer the most, so I'll refer to the official Eclipse page:
Tutorial: Create a Hello ARM test project
Tutorial: Create a blinky ARM test project (this is the correct project, not the above one)
There's more here:
printf() and scanf() with GNU ARM Libraries | MCU on Eclipse
Alternatively, you can add your own libraries, that handles printf. This will require some editing, though:
g. printf to USART1 - Learning Eclipse & ARM
To add a new library:
C/C++ Build > Settings > Tool Settings > > GCC C++ Linker > Libraries > Libraries (-l)
Press the '+' button and add your library there.