README
^^^^^^
This port conributed by jeditekunum.
This is the README file for the port of NuttX to the MoteinoMEGA from
LowPowerLab (http://www.lowpowerlab.com). The MoteinoMEGA is based
on an Atmel ATMega1284P. As of this writing, documentation for the
MoteinoMEGA board is available here:
https://lowpowerlab.com/shop/index.php?_route_=Moteino/moteinomega
Contents
^^^^^^^^
o MoteinoMEGA Features
o Pin Connections
o DualOptiboot Bootloader
o Toolchains
o MoteinoMEGA Configuration Options
o Configurations
MoteinoMEGA Features
^^^^^^^^^^^^^^^^^^^^
o 16MHz ATmega1284P Atmel 8bit AVR RISC Processor
o 128Kbyte Flash
o 16Kbyte RAM
o 4Kbyte EEPROM
o 2 High Speed Serial Ports
o 8Ch 10bit Analog Input port
Pin Connections
^^^^^^^^^^^^^^^
-------------------- -----------------------------
ATMega1284P Pinout MoteinoMEGA board connection
-------------------- -----------------------------
(left)
1 AREF AR
2 PA7 A7
3 PA6 A6
4 PA5 A5
5 PA4 A4
6 PA3 A3
7 PA2 A2
8 PA1 A1
9 PA0 A0
10 PB0 0
11 PB1 1
12 PB2 (INT2) 2/i2 (used by optional radio)
13 PB3 (PWM0) 3
14 PB4 (PWM1/SS) 4/SS (used by optional radio)
15 PB5 (MOSI) 5/MO (used by optional radio/flash)
16 PB6 (MISO/PWM2) 6/MI (used by optional radio/flash)
17 PB7 (SCK/PWM3) 7/SCK (used by optional radio/flash)
18 VOUT 3v3
19 VIN VIN
20 GND GND
(bottom)
21 DTR/RTS DTR
22 TX0 v
23 RX0 ^
24 VIN
25
26 GND GND
(right)
27 GND GND
28 VIN VIN
29 VOUT 3v3
30 RESET RST
31 PD0 (RX0) 8/Serial 0 ^
32 PD1 (TX0) 9/Serial 0 v
33 PD2 (RX1/INT0) 10/Serial 0 ^/i0
34 PD3 (TX1/INT1) 11/Serial 1 v/i1
35 PD4 (PWM4) 12
36 PD5 (PWM5) 13
37 PD6 (PWM6) 14
38 PD7 (PWM7) 15/LED
39 PC0 (SCL) 16/SCL
40 PC1 (SDA) 17/SDA
41 PC2 (TCK) 18
42 PC3 (TMS) 19
43 PC4 (TDO) 20
44 PC5 (TDI) 21
45 PC6 22
46 PC7 23 (used by optional flash)
DualOptiboot Bootloader
^^^^^^^^^^^^^^^^^^^^^^^
o FTDI (or similar) USB-To-Serial converter with compatible connector
configured for DTR (AdaFruit, SparkFun, etc)
o Obtain ard-reset-arduino Python script
(one source: https://github.com/mikaelpatel/Cosa/blob/master/build/Arduino-Makefile/bin/ard-reset-arduino)
This script triggers the DTR pin to enter bootloader mode.
o Obtain avrdude for your platform.
Bootloader operates at 115200 baud. It would be useful to create a short script
that invokes ard-reset-arduino and then avrdude to load program. This script
could then also, optionally, invoke miniterm.py or some other serial interface
program for console.
Example:
APP=nuttx
CPU=atmega1284p
BAUD=115200
PORT=/dev/tty.usbserial-A703X8PQ
avr-size --mcu=$CPU -C --format=avr $APP
ard-reset-arduino --verbose $PORT
avrdude -q -V -p $CPU -C {location-of-avrdude.conf} -D -c arduino -b $BAUD \
-P $PORT -U flash:w:${APP}.hex:i
miniterm.py --port=$PORT --baud=$BAUD -q --lf
Toolchains
^^^^^^^^^^
The toolchain may be selected using the kconfig-mconf tool (via 'make menuconfig'),
by editing the existing configuration file (defconfig), or by overriding
the toolchain on the make commandline with CONFIG_AVR_TOOLCHAIN=<toolchain>.
The valid values for <toolchain> are BUILDROOT, CROSSPACK, LINUXGCC and WINAVR.
This port was tested using the macOS / CROSSPACK tool chain, GCC version 4.8.1.
Please see other NuttX documentation for toolchain details.
MoteinoMEGA Configuration Options
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
CONFIG_ARCH - Identifies the arch/ subdirectory. This should
be set to:
CONFIG_ARCH=avr
CONFIG_ARCH_FAMILY - For use in C code:
CONFIG_ARCH_FAMILY=avr
CONFIG_ARCH_FAMILY_family - For use in C code:
CONFIG_ARCH_FAMILY_AVR=y
CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
CONFIG_ARCH_CHIP=atmega
CONFIG_ARCH_CHIP_name - For use in C code to identify the exact
chip:
CONFIG_ARCH_CHIP_ATMEGA1284P=y
CONFIG_ARCH_BOARD - Identifies the boards/ subdirectory and
hence, the board that supports the particular chip or SoC.
CONFIG_ARCH_BOARD=moteino-mega
CONFIG_ARCH_BOARD_name - For use in C code
CONFIG_ARCH_BOARD_MOTEINO_MEGA=y
CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation
of delay loops
CONFIG_RAM_SIZE - Describes the installed DRAM. One of:
CONFIG_RAM_SIZE=(16*1024) - (16Kb)
CONFIG_RAM_START - The start address of installed SRAM
CONFIG_RAM_START=0x800100
CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
have LEDs
CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
stack. If defined, this symbol is the size of the interrupt
stack in bytes. If not defined, the user task stacks will be
used during interrupt handling.
CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to board architecture.
Individual subsystems can be enabled:
CONFIG_AVR_INT0=n
CONFIG_AVR_INT1=n
CONFIG_AVR_INT2=n
CONFIG_AVR_INT3=n
CONFIG_AVR_INT4=n
CONFIG_AVR_INT5=n
CONFIG_AVR_INT6=n
CONFIG_AVR_INT7=n
CONFIG_AVR_WDT=n
CONFIG_AVR_TIMER0=n
CONFIG_AVR_TIMER1=n
CONFIG_AVR_TIMER2=n
CONFIG_AVR_TIMER3=n
CONFIG_AVR_SPI=n
CONFIG_AVR_USART0=y
CONFIG_AVR_USART1=n
CONFIG_AVR_ADC=n
CONFIG_AVR_ANACOMP=n
CONFIG_AVR_TWI=n
If the watchdog is enabled, this specifies the initial timeout. Default
is maximum supported value.
CONFIG_WDTO_15MS
CONFIG_WDTO_30MS
CONFIG_WDTO_60MS
CONFIG_WDTO_120MS
CONFIG_WDTO_1250MS
CONFIG_WDTO_500MS
CONFIG_WDTO_1S
CONFIG_WDTO_2S
CONFIG_WDTO_4S
CONFIG_WDTO_8S
ATMEGA specific device driver settings
CONFIG_USARTn_SERIAL_CONSOLE - selects the USARTn for the
console and ttys0 (default is the USART0).
CONFIG_USARTn_RXBUFSIZE - Characters are buffered as received.
This specific the size of the receive buffer
CONFIG_USARTn_TXBUFSIZE - Characters are buffered before
being sent. This specific the size of the transmit buffer
CONFIG_USARTn_BAUD - The configure BAUD of the USART. Must be
CONFIG_USARTn_BITS - The number of bits. Must be either 7 or 8.
CONFIG_USARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity
CONFIG_USARTn_2STOP - Two stop bits
Configurations
^^^^^^^^^^^^^^
Common Configuration Notes
--------------------------
1. Each MoteinoMEGA configuration is maintained in a sub-directory and
can be selected as follow:
tools/configure.sh moteino-mega:<subdir>
Where <subdir> is one of the configuration sub-directories described in
the following paragraph.
2. These configurations use the mconf-based configuration tool. To
change a configurations using that tool, you should:
a. Build and install the kconfig-mconf tool. See nuttx/README.txt
see additional README.txt files in the NuttX tools repository.
b. Execute 'make menuconfig' in nuttx/ in order to start the
reconfiguration process.
Configuration Sub-Directories
-----------------------------
hello:
The simple apps/examples/hello "Hello, World!" example.
nsh:
Configures the NuttShell (nsh) located at examples/nsh. The
Configuration enables only the serial NSH interfaces.
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