i'd like to use an OS for the ARM7 project i have. this is a real time application and it involves USB, SD card, serial comm and i may need to use the Ethernet. can you recommend on OS that should simplify the development and won't burden on the project's budget?
How can anyone tell whether something may or may not be a "burden" on the project's budget if you don't say what that budget is?!
Keil RTX is free so I don't see why not use it, of course if you use Keil MDK.