Notes_0.92.txt

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FemtoOS_0.92.zip

What is this? The Femto OS is a very concise portable real time - preemptive operating system (RTOS) for embedded microcontrollers with minimal ram and flash, say 2KB .. 16KB flash and 128 .. 1024 bytes ram. The main target is the Atmel AVR architecture, such as the ATtiny or smaller ATmega series. The OS runs well on larger hardware also. The system is written in C with a separate port file. Porting has been done for 44 AVR devices. The typical footprint is between 1K and 4K flash, depending on the functions used. Somewhere around 2K for the OS itself is realistic figure for normal applications. The OS takes between 10 and 20 bytes of ram, tasks can take as little as 6 bytes of ram, but approximately 20 to 40 bytes is more realistic for real applications. Figures are including the stack. It is perfectly possible to run 4 or more tasks on an ATtiny261. There is no separate idle task and most api function calls run in OS space. The OS is interruptible most of the time, if needed. There are tools to watch and protect the use of the stack of the tasks and the OS. The code itself is heavily documented, and comes with a number of example applications, (which are minimally documented, but are intended to speak for themselves). Demo's run on all devices for which a port is available. Most of the demo's run directly on the STK500/STK501/STK503 boards, some require extra (but very simple) hardware. Femto OS is distributed under GPLv3 but a commercial license and support are available. Ports (Atmel) mega128 mega3250 mega88P mega1280 mega3250P tiny2313 mega1281 mega325P tiny24 mega1284P mega48 tiny25 mega162 mega48P tiny261 mega164P mega64 tiny43U mega168 mega640 tiny44 mega168P mega644 tiny45 mega16 mega644P tiny461 mega2560 mega645 tiny48 mega2561 mega6450 tiny84 mega324P mega8 tiny85 mega328P mega8515 tiny861 mega32 mega8535 tiny88 mega325 mega88

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