README
^^^^^^
README file for the Microment Eagle100 NuttX port.
References:
^^^^^^^^^^
Micromint: http://www.micromint.com/
Luminary: http://www.luminarymicro.com/
Development Environment
^^^^^^^^^^^^^^^^^^^^^^^
Either Linux or Cygwin on Windows can be used for the development environment.
The source has been built only using the GNU toolchain (see below). Other
toolchains will likely cause problems. Testing was performed using the Cygwin
environment because the Luminary FLASH programming application was used for
writing to FLASH and this application works only under Windows.
GNU Toolchain Options
^^^^^^^^^^^^^^^^^^^^^
The NuttX make system has been modified to support the multiple toolchain
options including:
1. The CodeSourcery GNU toolchain,
2. The devkitARM GNU toolchain,
3. The NuttX buildroot Toolchain (see below).
All testing has been conducted using the NuttX buildroot toolchain. However,
the make system is setup to default to use the devkitARM toolchain. To use
the CodeSourcery or devkitARM, you simply need to add one of the following
configuration options to your .config (or defconfig) file:
CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYW=y : CodeSourcery under Windows
CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYL=y : CodeSourcery under Linux
CONFIG_ARMV7M_TOOLCHAIN_DEVKITARM=y : devkitARM under Windows
CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT=y : NuttX buildroot under Linux or Cygwin (default)
You may also have to modify the PATH environment variable if your make cannot
find the tools.
NOTE: the CodeSourcery (for Windows) and devkitARM are Windows native toolchains.
The CodeSourcey (for Linux) and NuttX buildroot toolchains are Cygwin and/or Linux
native toolchains. There are several limitations to using a Windows based
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.
NOTE 1: The CodeSourcery toolchain (2009q1) does not work with default optimization
level of -Os (See Make.defs). It will work with -O0, -O1, or -O2, but not with
-Os.
NOTE 2: The devkitARM toolchain includes a version of MSYS make. Make sure that
the paths to Cygwin's /bin and /usr/bin directories appear BEFORE the devkitARM
path or will get the wrong version of make.
NuttX EABI "buildroot" Toolchain
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
A GNU GCC-based toolchain is assumed. The PATH environment variable should
be modified to point to the correct path to the Cortex-M3 GCC toolchain (if
different from the default in your PATH variable).
If you have no Cortex-M3 toolchain, one can be downloaded from the NuttX
Bitbucket download site (https://bitbucket.org/nuttx/buildroot/downloads/).
This GNU toolchain builds and executes in the Linux or Cygwin environment.
1. You must have already configured Nuttx in <some-dir>/nuttx.
cd tools
./configure.sh eagle100/<sub-dir>
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/cortexm3-eabi-defconfig-4.6.3 .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
details PLUS some special instructions that you will need to follow if you are
building a Cortex-M3 toolchain for Cygwin under Windows.
NOTE: Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
the NXFLAT tools. See the top-level TODO file (under "Binary loaders") for
more information about this problem. If you plan to use NXFLAT, please do not
use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
See instructions below.
NuttX OABI "buildroot" Toolchain
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The older, OABI buildroot toolchain is also available. To use the OABI
toolchain:
When building the buildroot toolchain, either (1) modify the
cortexm3-eabi-defconfig-4.6.3 configuration to use EABI (using
'make menuconfig'), or (2) use an exising OABI configuration such
as cortexm3-defconfig-4.3.3
NXFLAT Toolchain
^^^^^^^^^^^^^^^^
If you are *not* using the NuttX buildroot toolchain and you want to use
the NXFLAT tools, then you will still have to build a portion of the buildroot
tools -- just the NXFLAT tools. The buildroot with the NXFLAT tools 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.
cd tools
./configure.sh lpcxpresso-lpc1768/<sub-dir>
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/cortexm3-defconfig-nxflat .config
6. make oldconfig
7. make
8. Make sure that the PATH variable includes the path to the newly built
NXFLAT binaries.
Ethernet-Bootloader
^^^^^^^^^^^^^^^^^^^
Here are some notes about using the Luminary Ethernet boot-loader built
into the Eagle-100 board.
Built-In Application:
- The board has no fixed IP address but uses DHCP to get an address.
I used a D-link router; I can use a web browser to surf to the D-link
web page to get the address assigned by
- Then you can use this IP address in your browser to surf to the Eagle-100
board. It presents several interesting pages -- the most important is
the page called "Firmware Update". That page includes instructions on
how to download code to the Eagle-100.
- After you burn the first program, you lose this application. Then you
will probably be better off connected directly to the Eagle-100 board
or through a switch (The router caused problems for me during downloads).
Using the Ethernet Bootloader:
- You will need the "LM Flash Programmer application". You can get that
program from the Luminary web site. There is a link on the LM3S6918 page.
- Is there any documentation for using the bootloader? Yes and No: There
is an application note covering the bootloader on the Luminary site, but
it is not very informative. The Eagle100 User's Manual has the best
information.
- Are there any special things I have to do in my code, other than setting
the origin to 0x0000:2000 (APP_START_ADDRESS)? No. The bootloader assumes
that you have a vector table at that address . The bootloader does the
following each time it boots (after you have downloaded the first valid
application):
o The bootloader sets the vector table register to the APP_START_ADDRESS,
o It sets the stack pointer to the address at APP_START_ADDRESS, and then
o Jumps to the address at APP_START_ADDRESS+4.
- You can force the bootloader to skip starting the application and stay
in the update mode. You will need to do this in order to download a new
application. You force the update mode by holding the user button on the
Eagle-100 board while resetting the board. The user button is GPIOA, pin 6
(call FORCED_UPDATE_PIN in the bootloader code).
- Note 1: I had to remove my D-Link router from the configuration in order
to use the LM Flash Programmer (the Bootloader issues BOOTP requests to
communicate with the LM Flash Programmer, my router was responding to
these BOOTP requests and hosing the download). It is safer to connect
via a switch or via an Ethernet switch.
- Note 2: You don't need the router's DHCPD server in the download
configuration; the Luminary Flash Programmer has the capability of
temporarily assigning the IP address to the Eagle-100 via BOOTP.
Eagle100-specific Configuration Options
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
CONFIG_ARCH - Identifies the arch/ subdirectory. This should
be set to:
CONFIG_ARCH=arm
CONFIG_ARCH_family - For use in C code:
CONFIG_ARCH_ARM=y
CONFIG_ARCH_architecture - For use in C code:
CONFIG_ARCH_CORTEXM3=y
CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
CONFIG_ARCH_CHIP=lm
CONFIG_ARCH_CHIP_name - For use in C code to identify the exact
chip:
CONFIG_ARCH_CHIP_LM3S6918
CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
hence, the board that supports the particular chip or SoC.
CONFIG_ARCH_BOARD=eagle100 (for the MicroMint Eagle-100 development board)
CONFIG_ARCH_BOARD_name - For use in C code
CONFIG_ARCH_BOARD_EAGLE100
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 (SRAM in this case):
CONFIG_RAM_SIZE=0x00010000 (64Kb)
CONFIG_RAM_START - The start address of installed DRAM
CONFIG_RAM_START=0x20000000
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.
There are configurations for disabling support for interrupts GPIO ports.
GPIOH and GPIOJ must be disabled because they do not exist on the LM3S6918.
Additional interrupt support can be disabled if desired to reduce memory
footprint.
CONFIG_TIVA_GPIOA_IRQS=y
CONFIG_TIVA_GPIOB_IRQS=y
CONFIG_TIVA_GPIOC_IRQS=y
CONFIG_TIVA_GPIOD_IRQS=y
CONFIG_TIVA_GPIOE_IRQS=y
CONFIG_TIVA_GPIOF_IRQS=y
CONFIG_TIVA_GPIOG_IRQS=y
CONFIG_TIVA_GPIOH_IRQS=n << Always
CONFIG_TIVA_GPIOJ_IRQS=n << Always
LM3S6918 specific device driver settings
CONFIG_UARTn_SERIAL_CONSOLE - selects the UARTn for the
console and ttys0 (default is the UART0).
CONFIG_UARTn_RXBUFSIZE - Characters are buffered as received.
This specific the size of the receive buffer
CONFIG_UARTn_TXBUFSIZE - Characters are buffered before
being sent. This specific the size of the transmit buffer
CONFIG_UARTn_BAUD - The configure BAUD of the UART. Must be
CONFIG_UARTn_BITS - The number of bits. Must be either 7 or 8.
CONFIG_UARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity
CONFIG_UARTn_2STOP - Two stop bits
CONFIG_TIVA_SSI0 - Select to ensable support for SSI0
CONFIG_TIVA_SSI1 - Select to ensable support for SSI1
CONFIG_SSI_POLLWAIT - Select to disable interrupt driven SSI support.
Poll-waiting is recommended if the interrupt rate would be to
high in the interrupt driven case.
CONFIG_SSI_TXLIMIT - Write this many words to the Tx FIFO before
emptying the Rx FIFO. If the SPI frequency is high and this
value is large, then larger values of this setting may cause
Rx FIFO overrun errors. Default: half of the Tx FIFO size (4).
CONFIG_TIVA_ETHERNET - This must be set (along with CONFIG_NET)
to build the Stellaris Ethernet driver
CONFIG_TIVA_ETHLEDS - Enable to use Ethernet LEDs on the board.
CONFIG_TIVA_BOARDMAC - If the board-specific logic can provide
a MAC address (via tiva_ethernetmac()), then this should be selected.
CONFIG_TIVA_ETHHDUPLEX - Set to force half duplex operation
CONFIG_TIVA_ETHNOAUTOCRC - Set to suppress auto-CRC generation
CONFIG_TIVA_ETHNOPAD - Set to suppress Tx padding
CONFIG_TIVA_MULTICAST - Set to enable multicast frames
CONFIG_TIVA_PROMISCUOUS - Set to enable promiscuous mode
CONFIG_TIVA_BADCRC - Set to enable bad CRC rejection.
CONFIG_TIVA_DUMPPACKET - Dump each packet received/sent to the console.
Configurations
^^^^^^^^^^^^^^
Common Configuration Notes
--------------------------
1. Each Eagle-100 configuration is maintained in a sub-directory and
can be selected as follow:
cd tools
./configure.sh eagle100/<subdir>
cd -
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
-----------------------------
nettest:
This configuration directory may be used to enable networking using the
LM3S6918's Ethernet controller. It uses examples/nettest to exercise the
TCP/IP network.
NOTES:
1. This configuration is set to use Cygwin under Windows and the
CodeSourcery toolchain. That, however, is easily reconfigurable:
CONFIG_HOST_WINDOWS=y
CONFIG_WINDOWS_CYGWIN=y
CONFIG_ARM7M_TOOLCHAIN_CODESOURCERYW=y
httpd:
This builds the uIP web server example using the examples/webserver application
(for execution from FLASH).
NOTES:
1. This configuration is set to use Cygwin under Windows and the
CodeSourcery toolchain. That, however, is easily reconfigurable:
CONFIG_HOST_WINDOWS=y
CONFIG_WINDOWS_CYGWIN=y
CONFIG_ARM7M_TOOLCHAIN_CODESOURCERYW=y
This example can only be built using the buildroot toolchain
with NXFLAT support
nsh:
Configures the NuttShell (nsh) located at examples/nsh. The
Configuration enables only the serial NSH interfaces (the telnet
interface should also be functional, but is not enabled in this
configuration).
NOTES:
1. This configuration is set to use Cygwin under Windows and the
devkitARM toolchain. That, however, is easily reconfigurable:
CONFIG_HOST_WINDOWS=y
CONFIG_WINDOWS_CYGWIN=y
CONFIG_ARM7M_TOOLCHAIN_DEVKITARM=y
nxflat:
This builds the NXFLAT example at apps/examples/nxfalt.
NOTES:
1. This example can only be built using the NuttX buildroot
toolchain with the NXFLAT tools.
2. This configuration is set to use Cygwin under Windows and the
devkitARM toolchain. That, however, is easily reconfigurable:
CONFIG_HOST_WINDOWS=y
CONFIG_WINDOWS_CYGWIN=y
CONFIG_ARM7M_TOOLCHAIN_DEVKITARM=y
thttpd:
This builds the THTTPD web server example using the THTTPD and
the apps/examples/thttpd application.
NOTES:
1. This configuration is set to use Linux and the buildroot toolchain.
That, however, is easily reconfigurable:
CONFIG_HOST_LINUX=y
CONFIG_ARM7M_TOOLCHAIN_BUILDROOT=y
This example can only be built using the buildroot toolchain
with NXFLAT support
By default, all of these examples are built to be used with the Luminary
Ethernet Bootloader (you can change the ld.script file in any of these
sub-directories to change that configuration).
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