153 lines
4.5 KiB
Plaintext
153 lines
4.5 KiB
Plaintext
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README
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^^^^^^
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This README discusses issues unique to NuttX configurations for the
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Freescale DEMO9S12NE64 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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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 HC12 GCC toolchain (if
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different from the default in your PATH variable).
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If you have no HC12 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
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environments.
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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 demo9s12nec64/<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/m68hc12-defconfig-3.4.6 .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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HC12/DEMO9S12NEC64-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=hc
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CONFIG_ARCH_family - For use in C code:
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CONFIG_ARCH_HC=y
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CONFIG_ARCH_architecture - For use in C code:
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CONFIG_ARCH_HC12=y
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CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
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CONFIG_ARCH_CHIP=mc92s12nec64
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CONFIG_ARCH_CHIP_name - For use in C code
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CONFIG_ARCH_CHIP_MCS92S12NEC64
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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=demo9s12nec64
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CONFIG_ARCH_BOARD_name - For use in C code
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CONFIG_ARCH_BOARD_DEMOS92S12NEC64 (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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HC12 specific chip initialization
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HC12 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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Configurations
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^^^^^^^^^^^^^^
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Each Freescale HC12 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 demo9s12nec64/<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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