README
^^^^^
This is the README file for the port of NuttX to the Amber Web Server from
SoC Robotics (http://www.soc-robotics.com/index.htm). The
Amber Web Server is based on an Atmel ATMega128. As of this writing,
documentation for the Amber Web Server board is available here:
http://www.soc-robotics.com/product/Amber_Specs/Amber_Processor.html
and
http://www.soc-robotics.com/pdfs/Amber%201-5a%20Hardware%20Reference%20Guide.pdf
Contents
^^^^^^^^
o Amber Web Server Features
o Pin Connections
o Atmel AVRISP mkII Connection
o Toolchains
o Windows Native Toolchains
o NuttX buildroot Toolchain
o avr-libc
o Amber Web Server Configuration Options
o Configurations
Amber Web Server Features
^^^^^^^^^^^^^^^^^^^^^^^^^
o 17.56MHz ATmega128 Atmel 8bit AVR RISC Processor
o 128Kbyte Flash
o 64Kbyte RAM
o 10BaseT Ethernet Port
o High Speed Serial Port
o 8Ch 10bit Analog Input port
o 16 Digital IO ports
o Expansion bus for daughter cards
o LED status indicators
o ISP Programming port
o 7-14VDC input
o Power via Ethernet port
Pin Connections (PCB Rev 1.5a)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-------------------- -----------------------------
ATMega128 Pinout Amber board connection
-------------------- -----------------------------
(left)
1 PEN Pulled-up
2 PE0 (RXD0/PDI) MAX202ECWED T1IN or J7-1, ISP-PDI (via 74HC5053), J5-26
3 PE1 (TXD0/PDO) MAX202ECWED A1OUT or J7-9, ISP-PDO (via 74HC5053), J5-25
4 PE2 (XCK0/AIN0) MAX202ECWED T2IN, J5-24
5 PE3 (OC3A/AIN1) MAX202ECWED A2OUT, J5-23
6 PE4 (OC3B/INT4) J5-22
7 PE5 (OC3C/INT5) J5-21, RTL8019AS INT 0, TP5 PE5
8 PE6 (T3/INT6) J5-20
9 PE7 (ICP3/INT7) J5-19
10 PB0 (SS) Pull up of SS SPI master
11 PB1 (SCK) J7-7, ISP_SCK (via 74HC4053) and AT45D011 SCK, J5-17
12 PB2 (MOSI) AT45D011 SI. J5-16
13 PB3 (MISO) AT45D011 SO, J5-15
14 PB4 (OC0) AT45D011 CS\, J5-14
15 PB5 (OC1A) J5-13
16 PB6 (OC1B) J5-12
(bottom)
17 PB7 (OC2/OC1C) J5-11
18 PG3/TOSC2 32.768KHz XTAL
19 PG4/TOSC1 32.768KHz XTAL
20 RESET RESET
21 VCC
22 GND GND
23 XTAL2 14.7456MHz XTAL
24 XTAL1 14.7456MHz XTAL
25 PD0 (SCL/INT0) J5-10
26 PD1 (SDA/INT1) J5-9
27 PD2 (RXD1/INT2) J5-8, MAX488CSA RO (RS-485)
28 PD3 (TXD1/INT3) J5-7, MAX488CSA DI (RS-485)
29 PD4 (ICP1) J5-6
30 PD5 (XCK1) J5-5
31 PD6 (T1) J5-4
32 PD7 (T2) J5-3
(left)
48 PA3 (AD3) J5-?, 74HC5730, 62246DLP-7, RTL8019AS
47 PA4 (AD4) J5-?, 74HC5730, 62246DLP-7, RTL8019AS
46 PA5 (AD5) J5-?, 74HC5730, 62246DLP-7, RTL8019AS
45 PA6 (AD6) J5-?, 74HC5730, 62246DLP-7, RTL8019AS
44 PA7 (AD7) J5-?, 74HC5730, 62246DLP-7, RTL8019AS
43 PG2 (ALE) J5-1, 74HC5730, 62246DLP-7, RTL8019AS
42 PC7 (A15) TP4 A15, J5-27, 74HC5730
41 PC6 (A14) J5-28, 74HC5730, 62246DLP-7, RTL8019AS
40 PC5 (A13) J5-29, 74HC5730, 62246DLP-7, RTL8019AS
39 PC4 (A12) J5-30, 74HC5730, 62246DLP-7, RTL8019AS
38 PC3 (A11) J5-31, 74HC5730, 62246DLP-7, RTL8019AS
37 PC2 (A10) J5-32, 74HC5730, 62246DLP-7, RTL8019AS
36 PC1 (A9) J5-33, 74HC5730, 62246DLP-7, RTL8019AS
35 PC0 (A8) J5-34, 74HC5730, 62246DLP-7, RTL8019AS
34 PG1 (RD) TP2 RD\, J5-52, 62246DLP-7, RTL8019AS
33 PG0 (WR) TP3 WR\, J5-51, 62246DLP-7, RTL8019AS
(top)
64 AVCC
63 GND GND
62 AREF (analog supply)
61 PF0 (ADC0) J6-5, PDV-P9 Light Sensor
60 PF1 (ADC1) J6-7, Thermister
59 PF2 (ADC2) J6-9, MXA2500GL Dual Axis Accesserometer, AOUTX
58 PF3 (ADC3) J6-11, MXA2500GL Dual Axis Accesserometer, AOUTY
57 PF4 (ADC4/TCK) J6-13, MXA2500GL Dual Axis Accesserometer, TOUT
56 PF5 (ADC5/TMS) J6-15
55 PF6 (ADC6/TDO) J6-17
54 PF7 (ADC7/TDI) J6-19
53 GND GND
52 VCC
51 PA0 (AD0) J5-?, 74HC5730, 62246DLP-7, RTL8019AS
50 PA1 (AD1) J5-?, 74HC5730, 62246DLP-7, RTL8019AS
49 PA2 (AD2) J5-?, 74HC5730, 62246DLP-7, RTL8019AS
Switches and Jumpers
^^^^^^^^^^^^^^^^^^^^
ISP/UART0
JP1 - DTE/DCE selection
JP2 -
JP5 -
J11 - STK500 Enable
ADC
JP8 -
JP9 -
Networking
JP10 -
RS-485
J8 -
J9 -
J10 -
Atmel AVRISP mkII Connection
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ISP6PIN Header
--------------
1 2
MISO o o VCC
SCK o o MOSI
RESET\ o o GND
(ISP10PIN Connector)
------------------- -------------------------
1 2
MOSI o o Vcc - ISP-PDI: PE0/PDI/RX0 via 74HC5053
LED o o GND - ISP-PROG: J11/GND, to 74HC5053 and LED
RESET\ o o GND - to 74HC505
SCK o o GND - ISP_SCK: SCK, PB0/SS\
MISO o o GND - ISP-PDO: PE1/PD0/TX0 via 74HC5053
Board Orientation
|
| +-----+
| + O O |
| + O O |
| + O O
| + O O |
| + O x | PIN 1
| +-----+
|
AVRISP mkII Connection to 10-pin Header
-------------------------------------------
10PIN Header 6PIN Header
--------------------- ---------------------
Pin 1 MOSI Pin 4 MOSI
Pin 2 Vcc Pin 2 Vcc
Pin 3 LED Controlled via J11
Pin 4 GND Pin 6 GND
Pin 5 RESET\ Pin 5 RESET\
Pin 6 GND N/C
Pin 7 SCK Pin 3 SCK
Pin 8 GND N/C
Pin 9 MISO Pin 1 MISO
Pin 10 GND N/C
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.
Buildroot:
There is a DIY buildroot version for the AVR boards here:
http://bitbucket.org/nuttx/buildroot/downloads/. See the
following section for details on building this toolchain.
You may also have to modify the PATH environment variable if your make cannot
find the tools.
After configuring NuttX, make sure that CONFIG_AVR_BUILDROOT_TOOLCHAIN=y is set in your
.config file.
WinAVR:
For Cygwin development environment on Windows machines, you can use
WinAVR: http://sourceforge.net/projects/winavr/files/
You may also have to modify the PATH environment variable if your make cannot
find the tools.
After configuring NuttX, make sure that CONFIG_AVR_WINAVR_TOOLCHAIN=y is set in your
.config file.
WARNING: There is an incompatible version of cygwin.dll in the WinAVR/bin
directory! Make sure that the path to the correct cygwin.dll file precedes
the path to the WinAVR binaries!
Linux:
For Linux, there are widely available avr-gcc packages. On Ubuntu, use:
sudo apt-get install gcc-avr gdb-avr avr-libc
After configuring NuttX, make sure that CONFIG_AVR_LINUXGCC_TOOLCHAIN=y is set in your
.config file.
Mac OS X:
For Mac OS X, the CrossPack for AVR toolchain is available from:
http://www.obdev.at/products/crosspack/index.html
This toolchain is functionally equivalent to the Linux GCC toolchain.
Windows Native Toolchains
^^^^^^^^^^^^^^^^^^^^^^^^^
The WinAVR toolchain is a Windows native toolchain. There are several
limitations to using a Windows native toolchain in a Cygwin environment.
The three biggest are:
1. The Windows toolchain cannot follow Cygwin paths. Path conversions are
performed automatically in the Cygwin makefiles using the 'cygpath'
utility but you might easily find some new path problems. If so, check
out 'cygpath -w'
2. Windows toolchains cannot follow Cygwin symbolic links. Many symbolic
links are used in Nuttx (e.g., include/arch). The make system works
around these problems for the Windows tools by copying directories
instead of linking them. But this can also cause some confusion for
you: For example, you may edit a file in a "linked" directory and find
that your changes had no effect. That is because you are building the
copy of the file in the "fake" symbolic directory. If you use a
Windows toolchain, you should get in the habit of making like this:
make clean_context all
An alias in your .bashrc file might make that less painful.
An additional issue with the WinAVR toolchain, in particular, is that it
contains an incompatible version of the Cygwin DLL in its bin/ directory.
You must take care that the correct Cygwin DLL is used.
NuttX buildroot Toolchain
^^^^^^^^^^^^^^^^^^^^^^^^^
If NuttX buildroot toolchain source tarball cne can be downloaded from the
NuttX Bitbucket download site (https://bitbucket.org/nuttx/nuttx/downloads/).
This GNU toolchain builds and executes in the Linux or Cygwin environment.
1. You must have already configured Nuttx in <some-dir>/nuttx.
tools/configure.sh amber/<sub-dir>
NOTE: you also must copy avr-libc header files into the NuttX include
directory with command perhaps like:
cp -a /cygdrive/c/WinAVR/include/avr include/.
2. Download the latest buildroot package into <some-dir>
3. unpack the buildroot tarball. The resulting directory may
have versioning information on it like buildroot-x.y.z. If so,
rename <some-dir>/buildroot-x.y.z to <some-dir>/buildroot.
4. cd <some-dir>/buildroot
5. cp configs/avr-defconfig-4.5.2 .config
6. make oldconfig
7. make
8. Make sure that the PATH variable includes the path to the newly built
binaries.
See the file configs/README.txt in the buildroot source tree. That has more
detailed PLUS some special instructions that you will need to follow if you
are building a toolchain for Cygwin under Windows.
avr-libc
^^^^^^^^
Header Files
In any case, header files from avr-libc are required: http://www.nongnu.org/avr-libc/.
A snapshot of avr-lib is included in the WinAVR installation. For Linux
development platforms, avr-libc package is readily available (and would
be installed in the apt-get command shown above). But if you are using
the NuttX buildroot configuration on Cygwin, then you will have to build
get avr-libc from binaries.
Header File Installation
The NuttX build will required that the AVR header files be available via
the NuttX include directory. This can be accomplished by either copying
the avr-libc header files into the NuttX include directory:
cp -a <avr-libc-path>/include/avr <nuttx-path>/include/.
Or simply using a symbolic link:
ln -s <avr-libc-path>/include/avr <nuttx-path>/include/.
Build Notes:
It may not necessary to have a built version of avr-lib; only header files
are required. Bu if you choose to use the optimized libraru functions of
the flowing point library, then you may have to build avr-lib from sources.
Below are instructions for building avr-lib from fresh sources:
1. Download the avr-libc package from:
http://savannah.nongnu.org/projects/avr-libc/
I am using avr-lib-1.7.1.tar.bz2
2. Upack the tarball and cd into the
tar jxf avr-lib-1.7.1.tar.bz2
cd avr-lib-1.7.1
3. Configure avr-lib. Assuming that WinAVR is installed at the following
loction:
export PATH=/cygdrive/c/WinAVR/bin:$PATH
./configure --build=`./config.guess` --host=avr
This takes a *long* time.
4. Make avr-lib.
make
This also takes a long time because it generates variants for nearly
all AVR chips.
5. Install avr-lib.
make install
Amber Web Server 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_AVR=y
CONFIG_ARCH_architecture - For use in C code:
CONFIG_ARCH_CHIP_ATMEGA=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_ATMEGA128=y
CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
hence, the board that supports the particular chip or SoC.
CONFIG_ARCH_BOARD=amber
CONFIG_ARCH_BOARD_name - For use in C code
CONFIG_ARCH_BOARD_AMBER=y
CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation
of delay loops
CONFIG_ENDIAN_BIG - define if big endian (default is little
endian)
CONFIG_RAM_SIZE - Describes the installed DRAM. One of:
CONFIG_RAM_SIZE=(8*1024) - (8Kb)
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.
CONFIG_ARCH_CALIBRATION - Enables some build in instrumentation that
cause a 100 second delay during boot-up. This 100 second delay
serves no purpose other than it allows you to calibratre
CONFIG_ARCH_LOOPSPERMSEC. You simply use a stop watch to measure
the 100 second delay then adjust CONFIG_ARCH_LOOPSPERMSEC until
the delay actually is 100 seconds.
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 Amber Web Server configuration is maintained in a sub-directory and
can be selected as follow:
tools/configure.sh amber/<subdir>
Where <subdir> is one of the configuration sub-directories described in
the following paragraph.
NOTE: You must also copy avr-libc header files, perhaps like:
cp -a /cygdrive/c/WinAVR/include/avr include/.
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.
3. By default, all configurations assume the NuttX Buildroot toolchain
under Cygwin with Windows. This is easily reconfigured:
CONFIG_HOST_WINDOWS=y
CONFIG_WINDOWS_CYGWIN=y
CONFIG_AVR_BUILDROOT_TOOLCHAIN=y
Configuration Sub-Directories
-----------------------------
hello:
The simple apps/examples/hello "Hello, World!" example.
e4922ed9f0