5a4136630b
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2298 42af7a65-404d-4744-a932-0658087f49c3
285 lines
10 KiB
Plaintext
285 lines
10 KiB
Plaintext
README
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^^^^^^
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This README discusses issues unique to NuttX configurations for the
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MCU-123 LPC2148 development board.
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Development Environment
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^^^^^^^^^^^^^^^^^^^^^^^
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Either Linux or Cygwin on Windows can be used for the development environment.
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The source has been built only using the GNU toolchain (see below). Other
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toolchains will likely cause problems.
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GNU Toolchain Options
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^^^^^^^^^^^^^^^^^^^^^
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The NuttX make system has been modified to support the following different
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toolchain options.
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1. The NuttX buildroot Toolchain (see below).
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2. The CodeSourcery GNU toolchain,
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3. The devkitARM GNU toolchain, or
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All testing has been conducted using the NuttX buildroot toolchain. To use
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the CodeSourcery or devkitARM GNU toolchain, you simply need to build the
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system as follows:
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make # Will build for the NuttX buildroot toolchain
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make CROSSDEV=arm-eabi- # Will build for the devkitARM toolchain
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make CROSSDEV=arm-none-eabi- # Will build for the CodeSourcery toolchain
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make CROSSDEV=arm-elf- # Will build for the NuttX buildroot toolchain
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Of course, hard coding this CROSS_COMPILE value in Make.defs file will save
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some repetitive typing.
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NOTE: the CodeSourcery and devkitARM toolchains are Windows native toolchains.
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The NuttX buildroot toolchain is a Cygwin toolchain. There are several limitations
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to using a Windows based toolchain in a Cygwin environment. The three biggest are:
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1. The Windows toolchain cannot follow Cygwin paths. Path conversions are
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performed automatically in the Cygwin makefiles using the 'cygpath' utility
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but you might easily find some new path problems. If so, check out 'cygpath -w'
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2. Windows toolchains cannot follow Cygwin symbolic links. Many symbolic links
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are used in Nuttx (e.g., include/arch). The make system works around these
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problems for the Windows tools by copying directories instead of linking them.
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But this can also cause some confusion for you: For example, you may edit
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a file in a "linked" directory and find that your changes had not effect.
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That is because you are building the copy of the file in the "fake" symbolic
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directory. If you use a Windows toolchain, you should get in the habit of
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making like this:
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make clean_context; make CROSSDEV=arm-none-eabi-
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An alias in your .bashrc file might make that less painful.
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3. Dependencies are not made when using Windows versions of the GCC. This is
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because the dependencies are generated using Windows pathes which do not
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work with the Cygwin make.
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Support has been added for making dependencies with the CodeSourcery toolchain.
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That support can be enabled by modifying your Make.defs file as follows:
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- MKDEP = $(TOPDIR)/tools/mknulldeps.sh
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+ MKDEP = $(TOPDIR)/tools/mkdeps.sh --winpaths "$(TOPDIR)"
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If you have problems with the dependency build (for example, if you are not
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building on C:), then you may need to modify tools/mkdeps.sh
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NOTE 1: The CodeSourcery toolchain (2009q1) may not work with default optimization
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level of -Os (See Make.defs). It will work with -O0, -O1, or -O2, but not with
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-Os.
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NOTE 2: The devkitARM toolchain includes a version of MSYS make. Make sure that
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the paths to Cygwin's /bin and /usr/bin directories appear BEFORE the devkitARM
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path or will get the wrong version of make.
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NuttX buildroot Toolchain
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^^^^^^^^^^^^^^^^^^^^^^^^^
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A GNU GCC-based toolchain is assumed. The files */setenv.sh should
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be modified to point to the correct path to the Cortex-M3 GCC toolchain (if
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different from the default in your PATH variable).
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If you have no Cortex-M3 toolchain, one can be downloaded from the NuttX
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SourceForge download site (https://sourceforge.net/project/showfiles.php?group_id=189573).
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This GNU toolchain builds and executes in the Linux or Cygwin environment.
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1. You must have already configured Nuttx in <some-dir>/nuttx.
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cd tools
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./configure.sh eagle100/<sub-dir>
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2. Download the latest buildroot package into <some-dir>
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3. unpack the buildroot tarball. The resulting directory may
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have versioning information on it like buildroot-x.y.z. If so,
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rename <some-dir>/buildroot-x.y.z to <some-dir>/buildroot.
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4. cd <some-dir>/buildroot
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5. cp configs/cortexm3-defconfig-4.3.3 .config
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6. make oldconfig
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7. make
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8. Edit setenv.h, if necessary, so that the PATH variable includes
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the path to the newly built binaries.
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See the file configs/README.txt in the buildroot source tree. That has more
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detailed PLUS some special instructions that you will need to follow if you are
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building a Cortex-M3 toolchain for Cygwin under Windows.
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Flash Tools
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^^^^^^^^^^^
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I use the lpc21isp tool to load NuttX into FLASH. That tool is available
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in the files section at http://tech.groups.yahoo.com/group/lpc21isp/. In
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order version 1.60 of lpc21isp for Linux, I had to make several changes.
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This changes are shown in lpc21ips-1.60.diff.
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I use the script lpc21isp.sh to perform the actual download. You will
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probably have to make some changes to this script in order to use it.
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For example, the path to the built lpc21isp binary will most likely
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have to change. Then move this script to the top level NuttX
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directory and simply execute it to load NuttX onto the board (after
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entering ISP mode).
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Here are the detailed steps I use:
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1. Make sure you exit minicom (or whatever terminal emulator you are
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using). It will interfere with the download.
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2. On the MCU123 board, I need to put a jumper on JP3-INT. On that board,
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JP3-INT is connected to P0.14 of LPC214x. When P0.14 is low and RTS is
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changed from high to low, the LPC214x will enter ISP (In System Programming)
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state.
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3. start lpc21isp.sh
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4. reset the board
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ARM/LPC214X-specific Configuration Options
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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CONFIG_ARCH - Identifies the arch/ subdirectory. This should
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be set to:
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CONFIG_ARCH=arm
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CONFIG_ARCH_family - For use in C code:
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CONFIG_ARCH_ARM=y
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CONFIG_ARCH_architecture - For use in C code:
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CONFIG_ARCH_ARM7TDMI=y
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CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
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CONFIG_ARCH_CHIP=lpc214x
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CONFIG_ARCH_CHIP_name - For use in C code
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CONFIG_ARCH_CHIP_LPC214X
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CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
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hence, the board that supports the particular chip or SoC.
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CONFIG_ARCH_BOARD=mcu123-lpc214x
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CONFIG_ARCH_BOARD_name - For use in C code
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CONFIG_ARCH_BOARD_MCU123 (for the Spectrum Digital C5471 EVM)
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CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation
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of delay loops
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CONFIG_ENDIAN_BIG - define if big endian (default is little
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endian)
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CONFIG_DRAM_SIZE - Describes the installed RAM.
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CONFIG_DRAM_START - The start address of installed RAM
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CONFIG_DRAM_END - Should be (CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
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CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
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have LEDs
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CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
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stack. If defined, this symbol is the size of the interrupt
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stack in bytes. If not defined, the user task stacks will be
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used during interrupt handling.
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CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
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CONFIG_ARCH_CALIBRATION - Enables some build in instrumentation that
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cause a 100 second delay during boot-up. This 100 second delay
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serves no purpose other than it allows you to calibratre
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CONFIG_ARCH_LOOPSPERMSEC. You simply use a stop watch to measure
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the 100 second delay then adjust CONFIG_ARCH_LOOPSPERMSEC until
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the delay actually is 100 seconds.
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LPC2148 specific chip initialization
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These provide register setup values:
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CONFIG_EXTMEM_MODE, CONFIG_RAM_MODE, CONFIG_CODE_BASE, CONFIG_PLL_SETUP,
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CONFIG_MAM_SETUP, CONFIG_APBDIV_SETUP, CONFIG_EMC_SETUP, CONFIG_BCFG0_SETUP,
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CONFIG_BCFG1_SETUP, CONFIG_BCFG2_SETUP, CONFIG_BCFG3_SETUP, CONFIG_ADC_SETUP
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CONFIG_LPC214x_FIO - Enable fast GPIO (vs. legacy, "old" GPIO).
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LPC214X specific device driver settings
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CONFIG_UARTn_SERIAL_CONSOLE - selects the UARTn for the
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console and ttys0 (default is the UART0).
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CONFIG_UARTn_RXBUFSIZE - Characters are buffered as received.
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This specific the size of the receive buffer
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CONFIG_UARTn_TXBUFSIZE - Characters are buffered before
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being sent. This specific the size of the transmit buffer
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CONFIG_UARTn_BAUD - The configure BAUD of the UART.
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CONFIG_UARTn_BITS - The number of bits. Must be either 7 or 8.
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CONFIG_UARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity, 3=mark 1, 4=space 0
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CONFIG_UARTn_2STOP - Two stop bits
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LPC214X USB Configuration
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CONFIG_LPC214X_USBDEV_FRAME_INTERRUPT
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Handle USB Start-Of-Frame events.
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Enable reading SOF from interrupt handler vs. simply reading on demand.
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Probably a bad idea... Unless there is some issue with sampling the SOF
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from hardware asynchronously.
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CONFIG_LPC214X_USBDEV_EPFAST_INTERRUPT
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Enable high priority interrupts. I have no idea why you might want to
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do that
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CONFIG_LPC214X_USBDEV_NDMADESCRIPTORS
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Number of DMA descriptors to allocate in the 8Kb USB RAM. This is a
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tradeoff between the number of DMA channels that can be supported vs
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the size of the DMA buffers available.
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CONFIG_LPC214X_USBDEV_DMA
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Enable lpc214x-specific DMA support
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Configurations
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^^^^^^^^^^^^^^
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Each NXP LPC214x configuration is maintained in a sudirectory and
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can be selected as follow:
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cd tools
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./configure.sh mcu123-lpc214x/<subdir>
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cd -
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. ./setenv.sh
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Where <subdir> is one of the following:
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ostest:
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This configuration directory, performs a simple OS test using
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examples/ostest.
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nsh:
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Configures the NuttShell (nsh) located at examples/nsh. The
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Configuration enables only the serial NSH interfaces.
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usbserial:
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This configuration directory exercises the USB serial class
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driver at examples/usbserial. See examples/README.txt for
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more information.
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usbstorage:
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This configuration directory exercises the USB mass storage
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class driver at examples/usbstorage. See examples/README.txt for
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more information.
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