AVR ATMega2560
Extension of the AVR architecture to support the ATMega2560 and specific support for the Arduino Mega2560 board were contributed by Dimitry Kloper and first released in NuttX-7.14.
Peripheral Support
The following list indicates peripherals supported in NuttX:
Peripheral |
Support |
Notes |
|---|---|---|
GPIO |
Yes |
|
PWM |
No |
|
ADC |
No |
|
RTC |
No |
|
WTD |
No |
|
I2C |
No |
|
UART |
Yes |
|
SPI |
No |
|
TIMER |
Yes |
|
UART |
Yes |
UART
UART is implemented using interrupts. The chip doesn’t support DMA.
Timer
The timer peripheral is exposed as standard timer.
Flashing the Device
ATMega boards may vary in how to flash the device, but a common way to do so is
by using the avrdude utility.
The avrdude utility allows you to select the device being flashed with the
-p flag. In the case of the ATMega2560, you will need to supply -p
m2560.
You can also select which type of programmer you want to flash the device using.
There are a lot of options, which can be listed using avrdude -c ?. A common
programmer is stk500v2, which is often built into Arduino boards and allows
you to flash the device with a serial connection. You’ll need to specify the
port on your computer that the programmer/device is connected to with -P,
such as -P /dev/ttyACM0.
Here is an example command for flashing the nuttx.hex image to the
Arduino Mega2560:
$ avrdude -c stk500v2 -p m2560 -P /dev/ttyACM0 -U flash:w:nuttx.hex -v -D