README
^^^^^^
README for NuttX port to the Olimex LPC1766-STK development board
Contents
^^^^^^^^
Olimex LPC1766-STK development board
Development Environment
GNU Toolchain Options
IDEs
NuttX EABI "buildroot" Toolchain
NuttX OABI "buildroot" Toolchain
NXFLAT Toolchain
LEDs
Serial Console
Using OpenOCD and GDB with an FT2232 JTAG emulator
Olimex LPC1766-STK Configuration Options
USB Host Configuration
Configurations
Olimex LPC1766-STK development board
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
GPIO Usage:
-----------
GPIO PIN SIGNAL NAME
-------------------------------- ---- --------------
P0[0]/RD1/TXD3/SDA1 46 RD1
P0[1]/TD1/RXD3/SCL1 47 TD1
P0[2]/TXD0/AD0[7] 98 TXD0
P0[3]/RXD0/AD0[6] 99 RXD0
P0[4]/I2SRX_CLK/RD2/CAP2[0] 81 LED2/ACC IRQ
P0[5]/I2SRX_WS/TD2/CAP2[1] 80 CENTER
P0[6]/I2SRX_SDA/SSEL1/MAT2[0] 79 SSEL1
P0[7]/I2STX_CLK/SCK1/MAT2[1] 78 SCK1
P0[8]/I2STX_WS/MISO1/MAT2[2] 77 MISO1
P0[9]/I2STX_SDA/MOSI1/MAT2[3] 76 MOSI1
P0[10]/TXD2/SDA2/MAT3[0] 48 SDA2
P0[11]/RXD2/SCL2/MAT3[1] 49 SCL2
P0[15]/TXD1/SCK0/SCK 62 TXD1
P0[16]/RXD1/SSEL0/SSEL 63 RXD1
P0[17]/CTS1/MISO0/MISO 61 CTS1
P0[18]/DCD1/MOSI0/MOSI 60 DCD1
P0[19]/DSR1/SDA1 59 DSR1
P0[20]/DTR1/SCL1 58 DTR1
P0[21]/RI1/RD1 57 MMC PWR
P0[22]/RTS1/TD1 56 RTS1
P0[23]/AD0[0]/I2SRX_CLK/CAP3[0] 9 BUT1
P0[24]/AD0[1]/I2SRX_WS/CAP3[1] 8 TEMP
P0[25]/AD0[2]/I2SRX_SDA/TXD3 7 MIC IN
P0[26]/AD0[3]/AOUT/RXD3 6 AOUT
P0[27]/SDA0/USB_SDA 25 USB_SDA
P0[28]/SCL0/USB_SCL 24 USB_SCL
P0[29]/USB_D+ 29 USB_D+
P0[30]/USB_D- 30 USB_D-
P1[0]/ENET_TXD0 95 E_TXD0
P1[1]/ENET_TXD1 94 E_TXD1
P1[4]/ENET_TX_EN 93 E_TX_EN
P1[8]/ENET_CRS 92 E_CRS
P1[9]/ENET_RXD0 91 E_RXD0
P1[10]/ENET_RXD1 90 E_RXD1
P1[14]/ENET_RX_ER 89 E_RX_ER
P1[15]/ENET_REF_CLK 88 E_REF_CLK
P1[16]/ENET_MDC 87 E_MDC
P1[17]/ENET_MDIO 86 E_MDIO
P1[18]/USB_UP_LED/PWM1[1]/CAP1[0] 32 USB_UP_LED
P1[19]/MC0A/#USB_PPWR/CAP1[1] 33 #USB_PPWR
P1[20]/MCFB0/PWM1[2]/SCK0 34 SCK0
P1[21]/MCABORT/PWM1[3]/SSEL0 35 SSEL0
P1[22]/MC0B/USB_PWRD/MAT1[0] 36 USBH_PWRD
P1[23]/MCFB1/PWM1[4]/MISO0 37 MISO0
P1[24]/MCFB2/PWM1[5]/MOSI0 38 MOSI0
P1[25]/MC1A/MAT1[1] 39 LED1
P1[26]/MC1B/PWM1[6]/CAP0[0] 40 CS_UEXT
P1[27]/CLKOUT/#USB_OVRCR/CAP0[1] 43 #USB_OVRCR
P1[28]/MC2A/PCAP1[0]/MAT0[0] 44 P1.28
P1[29]/MC2B/PCAP1[1]/MAT0[1] 45 P1.29
P1[30]/VBUS/AD0[4] 21 VBUS
P1[31]/SCK1/AD0[5] 20 AIN5
P2[0]/PWM1[1]/TXD1 75 UP
P2[1]/PWM1[2]/RXD1 74 DOWN
P2[2]/PWM1[3]/CTS1/TRACEDATA[3] 73 TRACE_D3
P2[3]/PWM1[4]/DCD1/TRACEDATA[2] 70 TRACE_D2
P2[4]/PWM1[5]/DSR1/TRACEDATA[1] 69 TRACE_D1
P2[5]/PWM1[6]/DTR1/TRACEDATA[0] 68 TRACE_D0
P2[6]/PCAP1[0]/RI1/TRACECLK 67 TRACE_CLK
P2[7]/RD2/RTS1 66 LEFT
P2[8]/TD2/TXD2 65 RIGHT
P2[9]/USB_CONNECT/RXD2 64 USBD_CONNECT
P2[10]/#EINT0/NMI 53 ISP_E4
P2[11]/#EINT1/I2STX_CLK 52 #EINT1
P2[12]/#EINT2/I2STX_WS 51 WAKE-UP
P2[13]/#EINT3/I2STX_SDA 50 BUT2
P3[25]/MAT0[0]/PWM1[2] 27 LCD_RST
P3[26]/STCLK/MAT0[1]/PWM1[3] 26 LCD_BL
Serial Console
--------------
The LPC1766-STK board has two serial connectors. One, RS232_0, connects to
the LPC1766 UART0. This is the DB-9 connector next to the power connector.
The other RS232_1, connect to the LPC1766 UART1. This is he DB-9 connector
next to the Ethernet connector.
Simple UART1 is the more flexible UART and since the needs for a serial
console are minimal, the more minimal UART0/RS232_0 is used for the NuttX
system console. Of course, this can be changed by editting the NuttX
configuration file as discussed below.
The serial console is configured as follows (57600 8N1):
BAUD: 57600
Number of Bits: 8
Parity: None
Stop bits: 1
You will need to connect a monitor program (Hyperterminal, Tera Term,
minicom, whatever) to UART0/RS232_0 and configure the serial port as
shown above.
NOTE: These configurations have problems at 115200 baud.
LCD
---
The LPC1766-STK has a Nokia 6100 132x132 LCD and either a Phillips PCF8833
or an Epson S1D15G10 LCD controller. The NuttX configuration may have to
be adjusted depending on which controller is used with the LCD. The
"LPC1766-STK development board Users Manual" states tha the board features
a "LCD NOKIA 6610 128x128 x12bit color TFT with Epson LCD controller."
But, referring to a different Olimex board, "Nokia 6100 LCD Display
Driver," Revision 1, James P. Lynch ("Nokia 6100 LCD Display Driver.pdf")
says:
"The major irritant in using this display is identifying the graphics
controller; there are two possibilities (Epson S1D15G00 or Philips
PCF8833). The LCD display sold by the German Web Shop Jelu has a Leadis
LDS176 controller but it is 100% compatible with the Philips PCF8833).
So how do you tell which controller you have? Some message boards have
suggested that the LCD display be disassembled and the controller chip
measured with a digital caliper <20> well that<61>s getting a bit extreme.
"Here<72>s what I know. The Olimex boards have both display controllers
possible; if the LCD has a GE-12 sticker on it, it<69>s a Philips PCF8833.
If it has a GE-8 sticker, it<69>s an Epson controller. The older Sparkfun
6100 displays were Epson, their web site indicates that the newer ones
are an Epson clone. Sparkfun software examples sometimes refer to the
Philips controller so the whole issue has become a bit murky. The
trading companies in Honk Kong have no idea what is inside the displays
they are selling. A Nokia 6100 display that I purchased from Hong Kong
a couple of weeks ago had the Philips controller."
The LCD connects to the LPC1766 via SPI and two GPIOs. The two GPIOs are
noted above:
P1.21 is the SPI chip select, and
P3.25 is the LCD reset
P3.26 is PWM1 output used to control the backlight intensity.
MISO0 and MOSI0 are join via a 1K ohm resistor so the LCD appears to be
write only.
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.
GNU Toolchain Options
^^^^^^^^^^^^^^^^^^^^^
The NuttX make system has been modified to support the following different
toolchain options.
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 toolchain, you simply need 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)
If you are not using CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT, then you may also have to modify
the PATH in the setenv.h file 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.
IDEs
^^^^
NuttX is built using command-line make. It can be used with an IDE, but some
effort will be required to create the project.
Makefile Build
--------------
Under Eclipse, it is pretty easy to set up an "empty makefile project" and
simply use the NuttX makefile to build the system. That is almost for free
under Linux. Under Windows, you will need to set up the "Cygwin GCC" empty
makefile project in order to work with Windows (Google for "Eclipse Cygwin" -
there is a lot of help on the internet).
Native Build
------------
Here are a few tips before you start that effort:
1) Select the toolchain that you will be using in your .config file
2) Start the NuttX build at least one time from the Cygwin command line
before trying to create your project. This is necessary to create
certain auto-generated files and directories that will be needed.
3) Set up include pathes: You will need include/, arch/arm/src/lpc17xx,
arch/arm/src/common, arch/arm/src/armv7-m, and sched/.
4) All assembly files need to have the definition option -D __ASSEMBLY__
on the command line.
Startup files will probably cause you some headaches. The NuttX startup file
is arch/arm/src/lpc17x/lpc17_vectors.S.
NuttX EABI "buildroot" Toolchain
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
A GNU GCC-based toolchain is assumed. The files */setenv.sh 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 olimex-lpc1766stk/<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. Edit setenv.h, if necessary, so 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:
1. 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
2. Modify the Make.defs file to use the OABI conventions:
+CROSSDEV = arm-nuttx-elf-
+ARCHCPUFLAGS = -mtune=cortex-m3 -march=armv7-m -mfloat-abi=soft
+NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-gotoff.ld -no-check-sections
-CROSSDEV = arm-nuttx-eabi-
-ARCHCPUFLAGS = -mcpu=cortex-m3 -mthumb -mfloat-abi=soft
-NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-pcrel.ld -no-check-sections
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. Edit setenv.h, if necessary, so that the PATH variable includes
the path to the newly builtNXFLAT binaries.
LEDs
^^^^
If CONFIG_ARCH_LEDS is defined, then support for the LPC1766-STK LEDs will be
included in the build. See:
- configs/olimex-lpc1766stk/include/board.h - Defines LED constants, types and
prototypes the LED interface functions.
- configs/olimex-lpc1766stk/src/lpc1766stk.h - GPIO settings for the LEDs.
- configs/olimex-lpc1766stk/src/up_leds.c - LED control logic.
The LPC1766-STK has two LEDs. If CONFIG_ARCH_LEDS is defined, these LEDs will
be controlled as follows for NuttX debug functionality (where NC means "No Change").
Basically,
LED1:
- OFF means that the OS is still initializing. Initialization is very fast so
if you see this at all, it probably means that the system is hanging up
somewhere in the initialization phases.
- ON means that the OS completed initialization.
- Glowing means that the LPC17 is running in a reduced power mode: LED1 is
turned off when the processor enters sleep mode and back on when it wakesup
up.
LED2:
- ON/OFF toggles means that various events are happening.
- GLowing: LED2 is turned on and off on every interrupt so even timer interrupts
should cause LED2 to glow faintly in the normal case.
- Flashing. If the LED2 is flashing at about 2Hz, that means that a crash
has occurred. If CONFIG_ARCH_STACKDUMP=y, you will get some diagnostic
information on the console to help debug what happened.
NOTE: LED2 is controlled by a jumper labeled: ACC_IRQ/LED2. That jump must be
in the LED2 position in order to support LED2.
LED1 LED2 Meaning
------- -------- --------------------------------------------------------------------
OFF OFF Still initializing and there is no interrupt activity.
Initialization is very fast so if you see this, it probably means
that the system is hung up somewhere in the initialization phases.
OFF Glowing Still initializing (see above) but taking interrupts.
OFF ON This would mean that (1) initialization did not complete but the
software is hung, perhaps in an infinite loop, somewhere inside
of an interrupt handler.
OFF Flashing Ooops! We crashed before finishing initialization (or, perhaps
after initialization, during an interrupt while the LPC17xx was
sleeping -- see below).
ON OFF The system has completed initialization, but is apparently not taking
any interrupts.
ON Glowing The OS successfully initialized and is taking interrupts (but, for
some reason, is never entering a reduced power mode -- perhaps the
CPU is very busy?).
ON ON This would mean that (1) the OS complete initialization, but (2)
the software is hung, perhaps in an infinite loop, somewhere inside
of a signal or interrupt handler.
Glowing Glowing This is also a normal healthy state: The OS successfully initialized,
is running in reduced power mode, but taking interrupts. The glow
is very faint and you may have to dim the lights to see that LEDs are
active at all! See note below.
ON Flashing Ooops! We crashed sometime after initialization.
NOTE: In glowing/glowing case, you get some good subjective information about the
behavior of your system by looking at the level of the LED glow (or better, by
connecting O-Scope and calculating the actual duty):
1. The intensity of the glow is determined by the duty of LED on/off toggle --
as the ON period becomes larger with respect the OFF period, the LED will
glow more brightly.
2. LED2 is turned ON when entering an interrupt and turned OFF when returning from
the interrupt. A brighter LED2 means that the system is spending more time in
interrupt handling.
3. LED1 is turned OFF just before the processor goes to sleep. The processor
sleeps until awakened by an interrupt. LED1 is turned back ON after the
processor is re-awakened -- actually after returning from the interrupt that
cause the processor to re-awaken (LED1 will be off during the execution of
that interrupt). So a brighter LED1 means that the processor is spending
less time sleeping.
When my LPC1766 sits IDLE -- doing absolutely nothing but processing timer interrupts --
I see the following:
1. LED1 glows dimly due to the timer interrupts.
2. But LED2 is even more dim! The LED ON time excludes the time processing the
interrupt that re-awakens the processing. So this tells me that the LPC1766 is
spending more time processing timer interrupts than doing any other kind of
processing. That, of course, makes sense if the system is truly idle and only
processing timer interrupts.
Serial Console
^^^^^^^^^^^^^^
By default, all of these configurations use UART0 for the NuttX serial
console. UART0 corresponds to the DB-9 connector labelled "RS232_0". This
is a female connector and will require a normal male-to-female RS232 cable
to connect to a PC.
An alternate is UART1 which connects to the other DB-9 connector labeled
"RS232_1". UART1 is not enabled by default unless specifically noted
otherwise in the configuration description. A normal serial cable must be
used with the port as well.
By default serial console is configured for 57600 baud, 8-bit, 1 stop bit,
and no parity. Higher rates will probably require minor modification of
the UART initialization logic to use the fractional dividers.
Using OpenOCD and GDB with an FT2232 JTAG emulator
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Downloading OpenOCD
You can get information about OpenOCD here: http://openocd.berlios.de/web/
and you can download it from here. http://sourceforge.net/projects/openocd/files/.
To get the latest OpenOCD with more mature lpc17xx, you have to download
from the GIT archive.
git clone git://openocd.git.sourceforge.net/gitroot/openocd/openocd
At present, there is only the older, frozen 0.4.0 version. These, of course,
may have changed since I wrote this.
Building OpenOCD under Cygwin:
You can build OpenOCD for Windows using the Cygwin tools. Below are a
few notes that worked as of November 7, 2010. Things may have changed
by the time you read this, but perhaps the following will be helpful to
you:
1. Install Cygwin (http://www.cygwin.com/). My recommendation is to install
everything. There are many tools you will need and it is best just to
waste a little disk space and have everthing you need. Everything will
require a couple of gigbytes of disk space.
2. Create a directory /home/OpenOCD.
3. Get the FT2232 drivr from http://www.ftdichip.com/Drivers/D2XX.htm and
extract it into /home/OpenOCD/ftd2xx
$ pwd
/home/OpenOCD
$ ls
CDM20802 WHQL Certified.zip
$ mkdir ftd2xx
$ cd ftd2xx
$ unzip ..CDM20802\ WHQL\ Certified.zip
Archive: CDM20802 WHQL Certified.zip
...
3. Get the latest OpenOCD source
$ pwd
/home/OpenOCD
$ git clone git://openocd.git.sourceforge.net/gitroot/openocd/openocd
You will then have the source code in /home/OpenOCD/openocd
4. Build OpenOCD for the FT22322 interface
$ pwd
/home/OpenOCD/openocd
$ ./bootstrap
Jim is a tiny version of the Tcl scripting language. It is needed
by more recent versions of OpenOCD. Build libjim.a using the following
instructions:
$ git submodule init
$ git submodule update
$ cd jimtcl
$ ./configure --with-jim-ext=nvp
$ make
$ make install
Configure OpenOCD:
$ ./configure --enable-maintainer-mode --disable-werror --disable-shared \
--enable-ft2232_ftd2xx --with-ftd2xx-win32-zipdir=/home/OpenOCD/ftd2xx \
LDFLAGS="-L/home/OpenOCD/openocd/jimtcl"
Then build OpenOCD and its HTML documentation:
$ make
$ make html
The result of the first make will be the "openocd.exe" will be
created in the folder /home/openocd/src. The following command
will install OpenOCD to a standard location (/usr/local/bin)
using using this command:
$ make install
Helper Scripts.
I have been using the Olimex ARM-USB-OCD JTAG debugger with the
LPC1766-STK (http://www.olimex.com). OpenOCD requires a configuration
file. I keep the one I used last here:
configs/olimex-lpc1766stk/tools/olimex.cfg
However, the "correct" configuration script to use with OpenOCD may
change as the features of OpenOCD evolve. So you should at least
compare that olimex.cfg file with configuration files in
/usr/local/share/openocd/scripts/target (or /home/OpenOCD/openocd/tcl/target).
As of this writing, there is no script for the lpc1766, but the
lpc1768 configurtion can be used after changing the flash size to
256Kb. That is, change:
flash bank $_FLASHNAME lpc2000 0x0 0x80000 0 0 $_TARGETNAME ...
To:
flash bank $_FLASHNAME lpc2000 0x0 0x40000 0 0 $_TARGETNAME ...
There is also a script on the tools/ directory that I use to start
the OpenOCD daemon on my system called oocd.sh. That script will
probably require some modifications to work in another environment:
- Possibly the value of OPENOCD_PATH and TARGET_PATH
- It assumes that the correct script to use is the one at
configs/olimex-lpc1766stk/tools/olimex.cfg
Starting OpenOCD
Then you should be able to start the OpenOCD daemon like:
configs/olimex-lpc1766stk/tools/oocd.sh $PWD
If you use the setenv.sh file, that the path to oocd.sh will be added
to your PATH environment variabl. So, in that case, the command simplifies
to just:
oocd.sh $PWD
Where it is assumed that you are executing oocd.sh from the top-level
directory where NuttX is installed. $PWD will be the path to the
top-level NuttX directory.
Connecting GDB
Once the OpenOCD daemon has been started, you can connect to it via
GDB using the following GDB command:
arm-nuttx-elf-gdb
(gdb) target remote localhost:3333
NOTE: The name of your GDB program may differ. For example, with the
CodeSourcery toolchain, the ARM GDB would be called arm-none-eabi-gdb.
After starting GDB, you can load the NuttX ELF file:
(gdb) symbol-file nuttx
(gdb) load nuttx
NOTES:
1. Loading the symbol-file is only useful if you have built NuttX to
include debug symbols (by setting CONFIG_DEBUG_SYMBOLS=y in the
.config file).
2. I usually have to reset, halt, and 'load nuttx' a second time. For
some reason, the first time apparently does not fully program the
FLASH.
3. The MCU must be halted prior to loading code using 'mon reset'
as described below.
OpenOCD will support several special 'monitor' commands. These
GDB commands will send comments to the OpenOCD monitor. Here
are a couple that you will need to use:
(gdb) monitor reset
(gdb) monitor halt
NOTES:
1. The MCU must be halted using 'mon halt' prior to loading code.
2. Reset will restart the processor after loading code.
3. The 'monitor' command can be abbreviated as just 'mon'.
Olimex LPC1766-STK 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=lpc17xx
CONFIG_ARCH_CHIP_name - For use in C code to identify the exact
chip:
CONFIG_ARCH_CHIP_LPC1766=y
CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
hence, the board that supports the particular chip or SoC.
CONFIG_ARCH_BOARD=olimex-lpc1766stk (for the Olimex LPC1766-STK)
CONFIG_ARCH_BOARD_name - For use in C code
CONFIG_ARCH_BOARD_LPC1766STK=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 (CPU SRAM in this case):
CONFIG_RAM_SIZE=(32*1024) (32Kb)
There is an additional 32Kb of SRAM in AHB SRAM banks 0 and 1.
CONFIG_RAM_START - The start address of installed DRAM
CONFIG_RAM_START=0x10000000
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_LPC17_MAINOSC=y
CONFIG_LPC17_PLL0=y
CONFIG_LPC17_PLL1=n
CONFIG_LPC17_ETHERNET=n
CONFIG_LPC17_USBHOST=n
CONFIG_LPC17_USBOTG=n
CONFIG_LPC17_USBDEV=n
CONFIG_LPC17_UART0=y
CONFIG_LPC17_UART1=n
CONFIG_LPC17_UART2=n
CONFIG_LPC17_UART3=n
CONFIG_LPC17_CAN1=n
CONFIG_LPC17_CAN2=n
CONFIG_LPC17_SPI=n
CONFIG_LPC17_SSP0=n
CONFIG_LPC17_SSP1=n
CONFIG_LPC17_I2C0=n
CONFIG_LPC17_I2C1=n
CONFIG_LPC17_I2S=n
CONFIG_LPC17_TMR0=n
CONFIG_LPC17_TMR1=n
CONFIG_LPC17_TMR2=n
CONFIG_LPC17_TMR3=n
CONFIG_LPC17_RIT=n
CONFIG_LPC17_PWM0=n
CONFIG_LPC17_MCPWM=n
CONFIG_LPC17_QEI=n
CONFIG_LPC17_RTC=n
CONFIG_LPC17_WDT=n
CONFIG_LPC17_ADC=n
CONFIG_LPC17_DAC=n
CONFIG_LPC17_GPDMA=n
CONFIG_LPC17_FLASH=n
LPC17xx 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
LPC17xx specific CAN device driver settings. These settings all
require CONFIG_CAN:
CONFIG_CAN_EXTID - Enables support for the 29-bit extended ID. Default
Standard 11-bit IDs.
CONFIG_CAN1_BAUD - CAN1 BAUD rate. Required if CONFIG_LPC17_CAN1 is defined.
CONFIG_CAN2_BAUD - CAN1 BAUD rate. Required if CONFIG_LPC17_CAN2 is defined.
CONFIG_CAN1_DIVISOR - CAN1 is clocked at CCLK divided by this number.
(the CCLK frequency is divided by this number to get the CAN clock).
Options = {1,2,4,6}. Default: 4.
CONFIG_CAN2_DIVISOR - CAN2 is clocked at CCLK divided by this number.
(the CCLK frequency is divided by this number to get the CAN clock).
Options = {1,2,4,6}. Default: 4.
CONFIG_CAN_TSEG1 - The number of CAN time quanta in segment 1. Default: 6
CONFIG_CAN_TSEG2 - the number of CAN time quanta in segment 2. Default: 7
LPC17xx specific PHY/Ethernet device driver settings. These setting
also require CONFIG_NET and CONFIG_LPC17_ETHERNET.
CONFIG_ETH0_PHY_KS8721 - Selects Micrel KS8721 PHY
CONFIG_PHY_AUTONEG - Enable auto-negotion
CONFIG_PHY_SPEED100 - Select 100Mbit vs. 10Mbit speed.
CONFIG_PHY_FDUPLEX - Select full (vs. half) duplex
CONFIG_NET_EMACRAM_SIZE - Size of EMAC RAM. Default: 16Kb
CONFIG_NET_NTXDESC - Configured number of Tx descriptors. Default: 18
CONFIG_NET_NRXDESC - Configured number of Rx descriptors. Default: 18
CONFIG_NET_WOL - Enable Wake-up on Lan (not fully implemented).
CONFIG_NET_REGDEBUG - Enabled low level register debug. Also needs
CONFIG_DEBUG_FEATURES.
CONFIG_NET_DUMPPACKET - Dump all received and transmitted packets.
Also needs CONFIG_DEBUG_FEATURES.
CONFIG_NET_HASH - Enable receipt of near-perfect match frames.
CONFIG_LPC17_MULTICAST - Enable receipt of multicast (and unicast) frames.
Automatically set if CONFIG_NET_IGMP is selected.
LPC17xx USB Device Configuration
CONFIG_LPC17_USBDEV_FRAME_INTERRUPT
Handle USB Start-Of-Frame events.
Enable reading SOF from interrupt handler vs. simply reading on demand.
Probably a bad idea... Unless there is some issue with sampling the SOF
from hardware asynchronously.
CONFIG_LPC17_USBDEV_EPFAST_INTERRUPT
Enable high priority interrupts. I have no idea why you might want to
do that
CONFIG_LPC17_USBDEV_NDMADESCRIPTORS
Number of DMA descriptors to allocate in SRAM.
CONFIG_LPC17_USBDEV_DMA
Enable lpc17xx-specific DMA support
CONFIG_LPC17_USBDEV_NOVBUS
Define if the hardware implementation does not support the VBUS signal
CONFIG_LPC17_USBDEV_NOLED
Define if the hardware implementation does not support the LED output
LPC17xx USB Host Configuration
CONFIG_USBHOST_OHCIRAM_SIZE
Total size of OHCI RAM (in AHB SRAM Bank 1)
CONFIG_USBHOST_NEDS
Number of endpoint descriptors
CONFIG_USBHOST_NTDS
Number of transfer descriptors
CONFIG_USBHOST_TDBUFFERS
Number of transfer descriptor buffers
CONFIG_USBHOST_TDBUFSIZE
Size of one transfer descriptor buffer
CONFIG_USBHOST_IOBUFSIZE
Size of one end-user I/O buffer. This can be zero if the
application can guarantee that all end-user I/O buffers
reside in AHB SRAM.
USB Host Configuration
^^^^^^^^^^^^^^^^^^^^^^
The NuttShell (NSH) configuration can be modified in order to support
USB host operations. To make these modifications, do the following:
1. First configure to build the NSH configuration from the top-level
NuttX directory:
cd tools
./configure olimex-lpc1766stk/nsh
cd ..
2. Modify the top-level .config file to enable USB host using:
make menuconfig
Make the following changes:
System Type -> LPC17xx Peripheral Support
CONFIG_LPC17_USBHOST=y
Device Drivers-> USB Host Driver Support
CONFIG_USBHOST=y
CONFIG_USBHOST_ISOC_DISABLE=y
CONFIG_USBHOST_MSC=y
Library Routines
CONFIG_SCHED_WORKQUEUE=y
When this change is made, NSH should be extended to support USB flash
devices. When a FLASH device is inserted, you should see a device
appear in the /dev (pseudo) directory. The device name should be
like /dev/sda, /dev/sdb, etc. The USB mass storage device, is present
it can be mounted from the NSH command line like:
ls /dev
mount -t vfat /dev/sda /mnt/flash
Files on the connect USB flash device should then be accessible under
the mountpoint /mnt/flash.
Configurations
^^^^^^^^^^^^^^
Common Configuration Notes
--------------------------
1. Each Olimex LPC1766-STK configuration is maintained in a
sub-directory and can be selected as follow:
cd tools
./configure.sh olimex-lpc1766stk/<subdir>
cd -
. ./setenv.sh
Where <subdir> is one of the sub-directories identified in the following
paragraphs.
Use configure.bat instead of configure.sh if you are building in a
Windows native environment.
2. These configurations use the mconf-based configuration tool. To
change a configuration 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
-----------------------------
ftpc:
This is a simple FTP client shell used to exercise the capabilities
of the FTPC library (apps/netutils/ftpc). This example is configured
to that it will only work as a "built-in" program that can be run from
NSH when CONFIG_NSH_BUILTIN_APPS is defined.
From NSH, the startup command sequence is then:
nsh> mount -t vfat /dev/mmcsd0 /tmp # Mount the SD card at /tmp
nsh> cd /tmp # cd into the /tmp directory
nsh> ftpc xx.xx.xx.xx[:pp] # Start the FTP client
nfc> login <name> <password> # Log into the FTP server
nfc> help # See a list of FTP commands
where xx.xx.xx.xx is the IP address of the FTP server and pp is an
optional port number (default is the standard FTP port number 21).
NOTES:
1. Support for FAT long file names is built-in but can easily be
removed if you are concerned about Microsoft patent issues (see the
section "FAT Long File Names" in the top-level COPYING file).
CONFIG_FS_FAT=y
CONFIG_FAT_LCNAMES=y <-- Long file name support
CONFIG_FAT_LFN=y
CONFIG_FAT_MAXFNAME=32
CONFIG_FS_NXFFS=n
CONFIG_FS_ROMFS=n
2. This configuration targets Linux using a generic ARM EABI toolchain:
CONFIG_LINUX=y
CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIL=y
But that can easily be re-configured.
2. You may also want to define the following in your configuration file.
Otherwise, you will have not feedback about what is going on:
CONFIG_DEBUG_FEATURES=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_FTPC=y
hidkbd:
This configuration directory, performs a simple test of the USB host
HID keyboard class driver using the test logic in apps/examples/hidkbd.
NOTES:
1. Default platform/toolchain: This is how the build is configured by
be default. These options can easily be re-confured, however.
CONFIG_HOST_WINDOWS=y : Windows
CONFIG_WINDOWS_CYGWIN=y : Cygwin environment on Windows
CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYW=y : CodeSourcery under Windows
2. I used this configuration to test the USB hub class. I did this
testing with the following changes to the configuration:
Drivers -> USB Host Driver Support
CONFIG_USBHOST_HUB=y : Enable the hub class
CONFIG_USBHOST_ASYNCH=y : Asynchonous I/O supported needed for hubs
System Type -> USB host configuration
CONFIG_LPC17_USBHOST_NASYNCH=8 : Allow up to 8 asynchronous requests
CONFIG_USBHOST_NEDS=3 : Increase number of endpoint descriptors from 2
CONFIG_USBHOST_NTDS=4 : Increase number of transfer descriptors from 3
CONFIG_USBHOST_TDBUFFERS=4 : Increase number of transfer buffers from 3
CONFIG_USBHOST_IOBUFSIZE=256 : Decrease the size of I/O buffers from 512
RTOS Features -> Work Queue Support
CONFIG_SCHED_LPWORK=y : Low priority queue support is needed
CONFIG_SCHED_LPNTHREADS=1
CONFIG_SCHED_LPWORKSTACKSIZE=1024
NOTES:
1. It is necessary to perform work on the low-priority work queue
(vs. the high priority work queue) because deferred hub-related
work requires some delays and waiting that is not appropriate on
the high priority work queue.
2. I also increased some stack sizes. These values are not tuned.
When I ran into stack size issues, I just increased the size of
all threads that had smaller stacks.
CONFIG_EXAMPLES_HIDKBD_STACKSIZE=2048 : Was 1024
CONFIG_HIDKBD_STACKSIZE=2048 : Was 1024
CONFIG_SCHED_HPWORKSTACKSIZE=2048 : Was 1024 (1024 is probably ok)
CONFIG_LPC1766STK_USBHOST_STACKSIZE=1536 | Was 1024
STATUS:
2015-05-03: The hub basically works. The only problem that I see is
that the code does not enumerate the hub if it is
connected at the time of reset up. It does not a power-up
reset, but not with the reset button. This sounds like
a hardwares reset issue on the board to me.
hidmouse:
This configuration directory supports a variant of an NSH configution.
It is set up to perform the touchscreen test at apps/examples/touchscreen
using a USB HIB mouse instead a touchsceen device.
NOTES:
1. Default platform/toolchain: This is how the build is configured by
be default. These options can easily be re-confured, however.
CONFIG_HOST_WINDOWS=y : Windows
CONFIG_WINDOWS_CYGWIN=y : Cygwin environment on Windows
CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYW=y : CodeSourcery under Windows
2. The mouse is really useless with no display and no cursor. So this
configuration is only suited for low-level testing. It is also awkward
to use. Here are the steps:
- Remove the USB HID mouse and reset the board.
- When the NSH prompt comes up type 'tc'. That will fail, but it
will register the USB HID mouse class driver.
- Now, insert the USB HID mouse. The next time that you enter the
'tc' command, the mouse device at /dev/mouse0 should be found.
nettest:
This configuration directory may be used to enable networking using the
LPC17xx's Ethernet controller. It uses apps/examples/nettest to excercise the
TCP/IP network.
nsh:
Configures the NuttShell (nsh) located at apps/examples/nsh. The
Configuration enables both the serial and telnet NSH interfaces.
Support for the board's SPI-based MicroSD card is included.
NOTE: If you start the program with no SD card inserted, there will be
a substantial delay. This is because there is no hardware support to sense
whether or not an SD card is inserted. As a result, the driver has to
go through many retries and timeouts before it finally decides that there
is not SD card in the slot.
NOTES:
1. Uses the older, OABI, buildroot toolchain. But that is easily
reconfigured:
CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT=y : Buildroot toolchain
CONFIG_ARMV7M_OABI_TOOLCHAIN=y : Older, OABI toolchain
2. This configuration supports a network. You may have to change
these settings for your network:
CONFIG_NSH_IPADDR=0x0a000002 : IP address: 10.0.0.2
CONFIG_NSH_DRIPADDR=0x0a000001 : Gateway: 10.0.0.1
CONFIG_NSH_NETMASK=0xffffff00 : Netmask: 255.255.255.0
3. This configuration supports the SPI-based MMC/SD card slot.
FAT file system support for FAT long file names is built-in but
can easily be removed if you are concerned about Microsoft patent
issues (see the section "FAT Long File Names" in the top-level
COPYING file).
CONFIG_FAT_LFN=y : Enables long file name support
nx:
An example using the NuttX graphics system (NX). This example uses
the Nokia 6100 LCD driver.
NOTES:
1. The Nokia 6100 driver does not work on this board as of this writing.
slip-httpd:
This configuration is identical to the thttpd configuration except that
it uses the SLIP data link layer via a serial driver instead of the
Ethernet data link layer. The Ethernet driver is disabled; SLIP IP
packets are exchanged on UART1; UART0 is still the serial console.
1. Configure and build the slip-httpd configuration.
2. Connect to a Linux box (assuming /dev/ttyS0)
3. Reset on the target side and attach SLIP on the Linux side:
$ modprobe slip
$ slattach -L -p slip -s 57600 /dev/ttyS0 &
This should create an interface with a name like sl0, or sl1, etc.
Add -d to get debug output. This will show the interface name.
NOTE: The -L option is included to suppress use of hardware flow
control. This is necessary because I haven't figured out how to
use the UART1 hardware flow control yet.
NOTE: The Linux slip module hard-codes its MTU size to 296. So you
might as well set CONFIG_NET_ETH_MTU to 296 as well.
4. After turning over the line to the SLIP driver, you must configure
the network interface. Again, you do this using the standard
ifconfig and route commands. Assume that we have connected to a
host PC with address 192.168.0.101 from your target with address
10.0.0.2. On the Linux PC you would execute the following as root:
$ ifconfig sl0 10.0.0.1 pointopoint 10.0.0.2 up
$ route add 10.0.0.2 dev sl0
Assuming the SLIP is attached to device sl0.
5. For monitoring/debugging traffic:
$ tcpdump -n -nn -i sl0 -x -X -s 1500
NOTE: Only UART1 supports the hardware handshake. If hardware
handshake is not available, then you might try the slattach option
-L which is supposed to enable "3-wire operation."
NOTE: This configurat only works with VERBOSE debug disabled. For some
reason, certain debug statements hang(?).
NOTE: This example does not use UART1's hardware flow control. UART1
hardware flow control is partially implemented but does not behave as
expected. It needs a little more work.
thttpd-binfs:
This builds the THTTPD web server example using the THTTPD and
the apps/examples/thttpd application. This version uses the built-in
binary format with the BINFS file system and the Union File System.
Otherwise it is equivalent to thttpd-binfs.
NOTES:
1. Uses the CodeSourcery EABI toolchain under Windows. But that is
easily reconfigured:
CONFIG_HOST_WINDOWS=y : Windows
CONFIG_HOST_WINDOWS_CYGWIN=y : under Cygwin
CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYW=y : CodeSourcery toolchain
STATUS:
2015-06-02. This configuration was added in an attempt to replace
thttpd-nxflat (see below). I concurrently get out-of-memory errors
during execution of CGI. The 32KiB SRAM may be insufficient for
this configuration; this might be fixed with some careful tuning
of stack usage.
2015-06-06: Modified to use the Union File System. Untested.
This configuration was ported to the lincoln60 which has an LPC1769
and, hence, more SRAM. Additional memory reduction steps were
required to run on the LPC1769. See nuttx/configs/lincoln60/README.txt
for additional information.
thttpd-nxflat:
This builds the THTTPD web server example using the THTTPD and
the apps/examples/thttpd application. This version uses the NXFLAT
binary format with the ROMFS file system, otherwise it is equivalent to
thttpd-binfs.
NOTES:
1. Uses the newer, EABI, buildroot toolchain. But that is easily
reconfigured:
CONFIG_HOST_LINUX=y : Linux
CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT=y : Buildroot toolchain
CONFIG_ARMV7M_OABI_TOOLCHAIN=n : Newer, EABI toolchain
STATUS:
2015-06-02. Do to issues introduced by recent versions of GCC, NXFLAT
is not often usable.
See http://www.nuttx.org/doku.php?id=wiki:vfs:nxflat#toolchain_compatibility_problem
usbserial:
This configuration directory exercises the USB serial class
driver at apps/examples/usbserial. See apps/examples/README.txt for
more information.
usbmsc:
This configuration directory exercises the USB mass storage
class driver at apps/system/usbmsc. See apps/examples/README.txt
for more information.
zmodem:
This is an alternative NSH configuration that was used to test Zmodem
file transfers. It is similar to the standard NSH configuration but has
the following differences:
1. UART0 is still the NuttX serial console as with most of the other
configurations here. However, UART1 is also enabled for performing
the Zmodem transfers.
CONFIG_LPC17XX_UART1=y
CONFIG_UART1_ISUART=y
CONFIG_UART1_RXBUFSIZE=1024
CONFIG_UART1_TXBUFSIZE=256
CONFIG_UART1_BAUD=2400
CONFIG_UART1_BITS=8
CONFIG_UART1_PARITY=0
CONFIG_UART1_2STOP=0
2. Hardware Flow Control
In principle, Zmodem transfers could be performed on the any serial
device, including the console device. However, only the LPC17xx
UART1 supports hardware flow control which is required for Zmodem
trasnfers. Also, this configuration permits debug output on the
serial console while the transfer is in progress without interfering
with the file transfer.
In additional, a very low BAUD is selected to avoid other sources
of data overrun. This should be unnecessary if buffering and hardware
flow control are set up correctly.
However, in the LPC17xx serial driver, hardware flow control only
protects the hardware RX FIFO: Data will not be lost in the hardware
FIFO but can still be lost when it is taken from the FIFO. We can
still overflow the serial driver's RX buffer even with hardware flow
control enabled! That is probably a bug. But the workaround solution
that I have used is to use lower data rates and a large serial driver
RX buffer.
Those measures should be unnecessary if buffering and hardware flow
control are set up and working correctly.
3. Buffering Notes:
RX Buffer Size
--------------
The Zmodem protocol supports a message that informs the file sender
of the maximum size of dat that you can buffer (ZRINIT). However, my
experience is that the Linux sz ignores this setting and always sends
file data at the maximum size (1024) no matter what size of buffer you
report. That is unfortunate because that, combined with the
possibilities of data overrun mean that you must use quite large
buffering for Zmodem file receipt to be reliable (none of these issues
effect sending of files).
Buffer Recommendations
----------------------
Based on the limitations of NuttX hardware flow control and of the
Linux sz behavior, I have been testing with the following configuration
(assuming UART1 is the Zmodem device):
a) This setting determines that maximum size of a data packet frame:
CONFIG_SYSTEM_ZMODEM_PKTBUFSIZE=1024
b) Input Buffering. If the input buffering is set to a full frame,
then data overflow is less likely.
CONFIG_UART1_RXBUFSIZE=1024
c) With a larger driver input buffer, the Zmodem receive I/O buffer
can be smaller:
CONFIG_SYSTEM_ZMODEM_RCVBUFSIZE=256
d) Output buffering. Overrun cannot occur on output (on the NuttX side)
so there is no need to be so careful:
CONFIG_SYSTEM_ZMODEM_SNDBUFSIZE=512
CONFIG_UART1_TXBUFSIZE=256
4. Support is included for the NuttX sz and rz commands. In order to
use these commands, you will need to mount the SD card so that you
will have a file system to transfer files in and out of:
nsh> mount -t vfat /dev/mmcds0 /mnt/sdcard
NOTE: You must use the mountpoint /mnt/sdcard because that is the
Zmodem sandbox specified in the configuration: All files received
from the remote host will be stored at /mnt/sdcard because of:
CONFIG_SYSTEM_ZMODEM_MOUNTPOINT="/mnt/sdcard"
Hmmm.. I probably should set up an NSH script to just mount /dev/mmcsd0
at /mnt/sdcard each time the board boots.
4. Sending Files from the Target to the Linux Host PC
This program has been verified against the rzsz programs running on a
Linux PC. To send a file to the PC, first make sure that the serial
port is configured to work with the board:
$ sudo stty -F /dev/ttyS0 2400 # Select 2400 BAUD
$ sudo stty -F /dev/ttyS0 crtscts # Enables CTS/RTS handshaking *
$ sudo stty -F /dev/ttyS0 # Show the TTY configuration
* Only is hardware flow control is enabled. It is *not* in this
default configuration.
Start rz on the Linux host:
$ sudo rz </dev/ttyS0 >/dev/ttyS0
You can add the rz -v option multiple times, each increases the level
of debug output.
NOTE: The NuttX Zmodem does sends rz\n when it starts in compliance with
the Zmodem specification. On Linux this, however, seems to start some
other, incompatible version of rz. You need to start rz manually to
make sure that the correct version is selected. You can tell when this
evil rz/sz has inserted itself because you will see the '^' (0x5e)
character replacing the standard Zmodem ZDLE character (0x19) in the
binary data stream.
If you don't have the rz command on your Linux box, the package to
install rzsz (or possibily lrzsz).
Then on the target:
> sz -d /dev/ttyS1 <filename>
Where filename is the full path to the file to send (i.e., it begins
with the '/' character).
/dev/ttyS1 is configured to support Hardware flow control in order to
throttle therates of data transfer to fit within the allocated buffers.
Other devices may be used but if they do not support hardware flow
control, the transfers will fail
5. Receiving Files on the Target from the Linux Host PC
NOTE: There are issues with using the Linux sz command with the NuttX
rz command. See "STATUS" below. It is recommended that you use the
NuttX sz command on Linux as described in the next paragraph.
To send a file to the target, first make sure that the serial port on
the host is configured to work with the board:
$ sudo stty -F /dev/ttyS0 2400 # Select 2400 BAUD
$ sudo stty -F /dev/ttyS0 crtscts # Enables CTS/RTS handshaking *
$ sudo stty -F /dev/ttyS0 # Show the TTY configuration
* Only is hardware flow control is enabled. It is *not* in this
default configuration.
Start rz on the on the target:
nsh> rz -d /dev/ttyS1
/dev/ttyS1 is configured to support Hardware flow control in order to
throttle therates of data transfer to fit within the allocated buffers.
Other devices may be used but if they do not support hardware flow
control, the transfers will fail
Then use the sz command on Linux to send the file to the target:
$ sudo sz <filename> t </dev/ttyS0 >/dev/ttyS0
Where <filename> is the file that you want to send.
The resulting file will be found where you have configured the Zmodem
"sandbox" via CONFIG_SYSTEM_ZMODEM_MOUNTPOINT, in this case at
/mnt/sdcard.
You can add the az -v option multiple times, each increases the level
of debug output. If you want to capture the Linux rz output, then
re-direct stderr to a log file by adding 2>az.log to the end of the
rz command.
If you don't have the az command on your Linux box, the package to
install rzsz (or possibily lrzsz).
STATUS
2013-7-15: Testing against the Linux rz/sz commands.
I have been able to send large and small files with the target sz
command. I have been able to receive small files, but there are
problems receiving large files using the Linux sz command: The
Linux SZ does not obey the buffering limits and continues to send
data while rz is writing the previously received data to the file
and the serial driver's RX buffer is overrun by a few bytes while
the write is in progress. As a result, when it reads the next
buffer of data, a few bytes may be missing. The symptom of this
missing data is a CRC check failure.
Either (1) we need a more courteous host application, or (2) we
need to greatly improve the target side buffering capability!
We might get better behavior if we use the NuttX rz/sz commands
on the host side (see apps/system/zmodem/README.txt).
2013-7-16: More Testing against the Linux rz/sz commands.
I have verified that with debug off and at lower serial
BAUD (2400), the transfers of large files succeed without errors. I
do not consider this a "solution" to the problem. I also found that
the LPC17xx hardware flow control causes strange hangs; Zmodem works
much better with hardware flow control disabled.
At this lower BAUD, RX buffer sizes could probably be reduced; Or
perhaps the BAUD coud be increased. My thought, however, is that
tuning in such an unhealthy situation is not the approach: The
best thing to do would be to use the matching NuttX sz on the Linux
host side.
2013-7-16. More Testing against the NuttX rz/sz on Both Ends.
The NuttX sz/rz commands have been modified so that they can be
built and executed under Linux. In this case, there are no
transfer problems at all in either direction and with large or
small files. This configuration could probably run at much higher
serial speeds and with much smaller buffers (although that has not
been verified as of this writing).
