README
^^^^^
This is the README file for the port of NuttX to the Arduino Mega 2560 Rev3.
https://www.arduino.cc/en/Main/ArduinoBoardMega2560
The board is based on ATMega2560 chip from Atmel
http://www.atmel.com/devices/atmega2560.aspx
Toolchain
^^^^^^^^^
Right now only Atmel's AVR8 Toolchain is supported. You can get it from
http://www.atmel.com/tools/atmelavrtoolchainforwindows.aspx
It is basically WinAVR compatible so sub-projects may define WinAVR as a
tool-chain but specify path to the Atmel AVR8 in path. See
arduino-mega2560/hello for example.
MEMX
^^^^
If you use the GCC AVR toolchain from the Atmel Studio, then you can
enable suppport for the MEMX storage:
CONFIG_AVR_HAS_MEMX_PTR=y
If this support is enabled, then all strings will be saved in FLASH and
standard string-oriented interfaces such printf() will change so that
they accept memx pointers.
This means that (1) ALL strings must lie in FLASH, and (2) since the
strings are moved from SRAM to FLASH, you will save a LOT of SRAM usage
in some configurations that use a lot of string memory (such as the
ostest and nsh configurations).
