configs/pic32mx README
=====================
This README file discusses the port of NuttX to the PIC32MX board from
PCB Logic Design Co. This board features the MicroChip PIC32MX460F512L.
The board is a very simple -- little more than a carrier for the PIC32
MCU plus voltage regulation, debug interface, and an OTG connector.
Contents
========
Toolchains
PIC32MX Configuration Options
Configurations
Toolchains
==========
I am using the free, LITE version of the PIC32MX toolchain available
for download from the microchip.com web site. I am using the Windows
version. The MicroChip toolchain is the only toolchaing currently
supported in these configurations, but it should be a simple matter to
adapt to other toolchains by modifying the Make.defs file include in
each configuration.
Toolchain Options:
CONFIG_PIC32MX_MICROCHIPW - MicroChip full toolchain for Windows
CONFIG_PIC32MX_MICROCHIPL - MicroChip full toolchain for Linux
CONFIG_PIC32MX_MICROCHIPW_LITE - MicroChip LITE toolchain for Windows
CONFIG_PIC32MX_MICROCHIPL_LITE - MicroChip LITE toolchain for Linux
Windows Native Toolchains
NOTE: 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
PIC32MX Configuration Options
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
General Architecture Settings:
CONFIG_ARCH - Identifies the arch/ subdirectory. This should
be set to:
CONFIG_ARCH=mips
CONFIG_ARCH_family - For use in C code:
CONFIG_ARCH_MIPS=y
CONFIG_ARCH_architecture - For use in C code:
CONFIG_ARCH_MIPS32=y
CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
CONFIG_ARCH_CHIP=pic32mx
CONFIG_ARCH_CHIP_name - For use in C code to identify the exact
chip:
CONFIG_ARCH_CHIP_PIC32MX460F512L=y
CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
hence, the board that supports the particular chip or SoC.
CONFIG_ARCH_BOARD=pcblogic-pic32mx
CONFIG_ARCH_BOARD_name - For use in C code
CONFIG_ARCH_BOARD_PCBLOGICPIC32MX=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 PIC32MXx 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_PIC32MX_WDT
CONFIG_PIC32MX_RTCC
CONFIG_PIC32MX_TIMER1
CONFIG_PIC32MX_TIMER2
CONFIG_PIC32MX_TIMER3
CONFIG_PIC32MX_TIMER4
CONFIG_PIC32MX_TIMER5
CONFIG_PIC32MX_IC1
CONFIG_PIC32MX_IC2
CONFIG_PIC32MX_IC3
CONFIG_PIC32MX_IC4
CONFIG_PIC32MX_IC5
CONFIG_PIC32MX_OC1
CONFIG_PIC32MX_OC2
CONFIG_PIC32MX_OC3
CONFIG_PIC32MX_OC4
CONFIG_PIC32MX_OC5
CONFIG_PIC32MX_I2C1
CONFIG_PIC32MX_I2C2
CONFIG_PIC32MX_SPI1
CONFIG_PIC32MX_SPI2
CONFIG_PIC32MX_UART1
CONFIG_PIC32MX_UART2
CONFIG_PIC32MX_PMP
CONFIG_PIC32MX_ADC
CONFIG_PIC32MX_CVR
CONFIG_PIC32MX_CM1
CONFIG_PIC32MX_CM2
CONFIG_PIC32MX_OSC
CONFIG_PIC32MX_DDP
CONFIG_PIC32MX_FLASH
CONFIG_PIC32MX_BMX
CONFIG_PIC32MX_DMA
CONFIG_PIC32MX_CHE
CONFIG_PIC32MX_USB
CONFIG_PIC32MX_IOPORTA
CONFIG_PIC32MX_IOPORTB
CONFIG_PIC32MX_IOPORTC
CONFIG_PIC32MX_IOPORTD
CONFIG_PIC32MX_IOPORTE
CONFIG_PIC32MX_IOPORTF
CONFIG_PIC32MX_IOPORTG
PIC32MXx 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
PIC32MXx USB Device Configuration
PIC32MXx USB Host Configuration (the PIC32MX does not support USB Host)
Configurations
^^^^^^^^^^^^^^
Each PIC32MX configuration is maintained in a sudirectory and can be
selected as follow:
cd tools
./configure.sh pcblogic-pic32mx/<subdir>
cd -
. ./setenv.sh
Where <subdir> is one of the following:
ostest:
This configuration directory, performs a simple OS test using
apps/examples/ostest.
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