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README
^^^^^^
Tools
^^^^^
I use the lpc21isp tool to load NuttX into FLASH. That tool is available
in the files section at http://tech.groups.yahoo.com/group/lpc21isp/. In
order version 1.60 of lpc21isp for Linux, I had to make several changes.
This changes are shown in lpc21ips-1.60.diff.
I use the script lpc21isp.sh to perform the actual download. You will
probably have to make some changes to this script in order to use it.
For example, the path to the built lpc21isp binary will most likely
have to have change. Then move this script to the top level NuttX
directory and simply execute it to load NuttX onto the board.
Configurations
^^^^^^^^^^^^^^
Each NXP LPC214x configuration is maintained in a sudirectory and
can be selected as follow:
cd tools
./configure.sh mcu123-lpc214x/<subdir>
cd -
. ./setenv.sh
Where <subdir> is one of the following:
ostest
^^^^^^
This configuration directory, performs a simple OS test using
examples/ostest.
nsh
^^^
Configures the NuttShell (nsh) located at examples/nsh. The
Configuration enables only the serial NSH interfaces.
Configuration Options
^^^^^^^^^^^^^^^^^^^^^
In additional to the common configuration options listed in the
file configs/README.txt, there are other configuration options
specific to the LPC214x:
CONFIG_ARCH - identifies the arch subdirectory and, hence, the
processor architecture.
CONFIG_ARCH_name - for use in C code. This identifies the
particular chip or SoC that the architecture is implemented
in.
CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
CONFIG_ARCH_CHIP_name - For use in C code
CONFIG_ARCH_BOARD - identifies the configs subdirectory and, hence,
the board that supports the particular chip or SoC.
CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
CONFIG_ARCH_BOARD_name - for use in C code
CONFIG_BOARD_LOOPSPERMSEC - for delay loops
CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to lpc2148.
CONFIG_DRAM_SIZE - Describes the internal DRAM.
CONFIG_DRAM_START - The start address of internal DRAM
CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
LPC2148 specific chip initialization
CONFIG_EXTMEM_MODE, CONFIG_RAM_MODE. CONFIG_CODE_BASE, CONFIG_PLL_SETUP,
CONFIG_MAM_SETUP, CONFIG_APBDIV_SETUP, CONFIG_EMC_SETUP,. CONFIG_BCFG0_SETUP,
CONFIG_BCFG1_SETUP, CONFIG_BCFG2_SETUP, CONFIG_BCFG3_SETUP, CONFIG_ADC_SETUP
LPC214X UART 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, 3=mark 1, 4=space 0
CONFIG_UARTn_2STOP - Two stop bits
LPC214X USB Configuration
CONFIG_LPC214X_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_LPC214X_USBDEV_EPFAST_INTERRUPT
Enable high priority interrupts. I have no idea why you might want to
do that
CONFIG_LPC214X_USBDEV_NDMADESCRIPTORS
Number of DMA descriptors to allocate in the 8Kb USB RAM. This is a
tradeoff between the number of DMA channels that can be supported vs
the size of the DMA buffers available.
CONFIG_LPC214X_USBDEV_DMA
Enable lpc214x-specific DMA support
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