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 buildroot Toolchain
LEDs
Olimex LPC1766-STK Configuration Options
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
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_LPC17_CODESOURCERYW=y : CodeSourcery under Windows
CONFIG_LPC17_CODESOURCERYL=y : CodeSourcery under Linux
CONFIG_LPC17_DEVKITARM=y : devkitARM under Windows
CONFIG_LPC17_BUILDROOT=y : NuttX buildroot under Linux or Cygwin (default)
If you are not using CONFIG_LPC17_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 not 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.
3. Dependencies are not made when using Windows versions of the GCC. This is
because the dependencies are generated using Windows pathes which do not
work with the Cygwin make.
Support has been added for making dependencies with the windows-native toolchains.
That support can be enabled by modifying your Make.defs file as follows:
- MKDEP = $(TOPDIR)/tools/mknulldeps.sh
+ MKDEP = $(TOPDIR)/tools/mkdeps.sh --winpaths "$(TOPDIR)"
If you have problems with the dependency build (for example, if you are not
building on C:), then you may need to modify tools/mkdeps.sh
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 (There is a simple RIDE project
in the RIDE subdirectory).
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/cortexm3, 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 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
SourceForge download site (https://sourceforge.net/project/showfiles.php?group_id=189573).
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-defconfig-4.3.3 .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
detailed PLUS some special instructions that you will need to follow if you
are building a Cortex-M3 toolchain for Cygwin under Windows.
NOTE: This is an OABI toolchain.
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_internal.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.
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 1Hz, 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.
Will
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.
ON OFF The system has completed initialization, but is apparently not taking
any interrupts.
ON Glowing This is the normal healthy state: The OS successfully initialized
and is taking interrupts.
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.
ON Flashing Ooops! We crashed sometime after initialization.
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_DRAM_SIZE - Describes the installed DRAM (CPU SRAM in this case):
CONFIG_DRAM_SIZE=(32*1024) (32Kb)
There is an additional 32Kb of SRAM in AHB SRAM banks 0 and 1.
CONFIG_DRAM_START - The start address of installed DRAM
CONFIG_DRAM_START=0x10000000
CONFIG_DRAM_END - Last address+1 of installed RAM
CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
CONFIG_ARCH_IRQPRIO=y
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_PWM=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 USB 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
Configurations
^^^^^^^^^^^^^^
Each Olimex LPC1766-STK configuration is maintained in a
sudirectory and can be selected as follow:
cd tools
./configure.sh olimex-lpc1766stk/<subdir>
cd -
. ./setenv.sh
Where <subdir> is one of the following:
nsh:
Configures the NuttShell (nsh) located at examples/nsh. The
Configuration enables only the serial NSH interfaces.
ostest:
This configuration directory, performs a simple OS test using
examples/ostest.
usbserial:
This configuration directory exercises the USB serial class
driver at examples/usbserial. See examples/README.txt for
more information.
usbstorage:
This configuration directory exercises the USB mass storage
class driver at examples/usbstorage. See examples/README.txt for
more information.
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