cdevelopment-toolskeilmicrocontrollerstm32f4
A very popular and advertised tool for programming ARM microcontrollers is Keil MDK-ARM. The evaluation version can be downloaded here. However there is a code-size limitation of 32 kB for using the evaluation version of Keil. After some searching I found out that the CooCox IDE is a free alternative to Keil and similar software.
So my question, given that CooCox is absolutely free is… Is CooCox an alternative with no such limitations of code-size, etc.?
At the risk of sounding like a broken record...
PSoC5 is your answer! (It's amazing how many times PSoC is the answer)
The PSoC5 MCU has an ARM Cortex M3 core, and a bunch of other brilliant features that practically no other MCU has. Unlike other MCUs, setting up the peripherals is as fun as eating ice cream, and you can even create your own in Verilog! The IDE is pretty good, and totally free.
The Development Kit is great, and full of features and comes with the programmer, which you can use for your future projects. It's not too expensive.
Thanks to my friends, jippie and PeterJ I found the problem. the time and date of my PC had changed to past. I modified the time and the date and finally the keil works again.
Best Answer
CooCox (by default, at least) uses the GCC compiler (tautology alert!), which is completely free. I've been using CooCox for postgrad work and, although there are a few issues with the IDE (because it's Eclipse-based - make of that what you will...) I have found it to be very usable when compared to MDK-ARM (which I use at my day job).
CooCox (and GCC) have no code size limitations that I am aware of, and CooCox integrates very nicely with the STLINKv2 (including the built-in STLINKv2 on the ST32F Disco boards) for cheap STM32F debugging.