2011-05-08 23:38:47 +02:00
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configs/pic32mx README
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=====================
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This README file discusses the port of NuttX to the PIC32MX board from
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PCB Logic Design Co. This board features the MicroChip PIC32MX460F512L.
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The board is a very simple -- little more than a carrier for the PIC32
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MCU plus voltage regulation, debug interface, and an OTG connector.
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2011-05-12 00:47:59 +02:00
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Contents
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========
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Toolchains
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2011-05-17 00:20:26 +02:00
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PIC32MX Configuration Options
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Configurations
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2011-05-12 00:47:59 +02:00
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Toolchains
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==========
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I am using the free, LITE version of the PIC32MX toolchain available
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for download from the microchip.com web site. I am using the Windows
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2011-05-17 00:20:26 +02:00
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version. The MicroChip toolchain is the only toolchaing currently
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supported in these configurations, but it should be a simple matter to
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adapt to other toolchains by modifying the Make.defs file include in
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each configuration.
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Toolchain Options:
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CONFIG_PIC32MX_MICROCHIPW - MicroChip full toolchain for Windows
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CONFIG_PIC32MX_MICROCHIPL - MicroChip full toolchain for Linux
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CONFIG_PIC32MX_MICROCHIPW_LITE - MicroChip LITE toolchain for Windows
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CONFIG_PIC32MX_MICROCHIPL_LITE - MicroChip LITE toolchain for Linux
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Windows Native Toolchains
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NOTE: There are several limitations to using a Windows based toolchain in a
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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 all
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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 windows-native toolchains.
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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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PIC32MX Configuration Options
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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General Architecture Settings:
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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=mips
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CONFIG_ARCH_family - For use in C code:
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CONFIG_ARCH_MIPS=y
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CONFIG_ARCH_architecture - For use in C code:
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CONFIG_ARCH_MIPS32=y
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CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
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CONFIG_ARCH_CHIP=pic32mx
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CONFIG_ARCH_CHIP_name - For use in C code to identify the exact
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chip:
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CONFIG_ARCH_CHIP_PIC32MX460F512L=y
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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=pcblogic-pic32mx
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CONFIG_ARCH_BOARD_name - For use in C code
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CONFIG_ARCH_BOARD_PCBLOGICPIC32MX=y
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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 DRAM (CPU SRAM in this case):
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CONFIG_DRAM_SIZE=(32*1024) (32Kb)
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There is an additional 32Kb of SRAM in AHB SRAM banks 0 and 1.
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CONFIG_DRAM_START - The start address of installed DRAM
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CONFIG_DRAM_START=0x10000000
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CONFIG_DRAM_END - Last address+1 of installed RAM
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CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
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CONFIG_ARCH_IRQPRIO - The PIC32MXx supports interrupt prioritization
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CONFIG_ARCH_IRQPRIO=y
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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_LEDS - Use LEDs to show state. Unique to board architecture.
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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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2011-05-19 20:29:40 +02:00
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PIC32MX Configuration
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CONFIG_PIC32MX_MVEC - Select muli- vs. single-vectored interrupts
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2011-05-17 00:20:26 +02:00
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Individual subsystems can be enabled:
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CONFIG_PIC32MX_WDT
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CONFIG_PIC32MX_RTCC
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2011-05-19 20:29:40 +02:00
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CONFIG_PIC32MX_T2 /* Timer 1 is the system time and always enabled */
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CONFIG_PIC32MX_T3
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CONFIG_PIC32MX_T4
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CONFIG_PIC32MX_T5
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2011-05-17 00:20:26 +02:00
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CONFIG_PIC32MX_IC1
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CONFIG_PIC32MX_IC2
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CONFIG_PIC32MX_IC3
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CONFIG_PIC32MX_IC4
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CONFIG_PIC32MX_IC5
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CONFIG_PIC32MX_OC1
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CONFIG_PIC32MX_OC2
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CONFIG_PIC32MX_OC3
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CONFIG_PIC32MX_OC4
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CONFIG_PIC32MX_OC5
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CONFIG_PIC32MX_I2C1
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CONFIG_PIC32MX_I2C2
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CONFIG_PIC32MX_SPI1
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CONFIG_PIC32MX_SPI2
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CONFIG_PIC32MX_UART1
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CONFIG_PIC32MX_UART2
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CONFIG_PIC32MX_PMP
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CONFIG_PIC32MX_ADC
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CONFIG_PIC32MX_CVR
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CONFIG_PIC32MX_CM1
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CONFIG_PIC32MX_CM2
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CONFIG_PIC32MX_OSC
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CONFIG_PIC32MX_DDP
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CONFIG_PIC32MX_FLASH
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CONFIG_PIC32MX_BMX
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CONFIG_PIC32MX_DMA
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CONFIG_PIC32MX_CHE
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CONFIG_PIC32MX_USB
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CONFIG_PIC32MX_IOPORTA
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CONFIG_PIC32MX_IOPORTB
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CONFIG_PIC32MX_IOPORTC
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CONFIG_PIC32MX_IOPORTD
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CONFIG_PIC32MX_IOPORTE
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CONFIG_PIC32MX_IOPORTF
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CONFIG_PIC32MX_IOPORTG
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2011-05-19 20:29:40 +02:00
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The priority of interrupts may be specified. The value ranage of
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priority is 4-31. The default (16) will be used if these any of these
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are undefined.
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CONFIG_PIC32MX_WDTPRIO
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CONFIG_PIC32MX_RTCCPRIO
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CONFIG_PIC32MX_T1PRIO /* System timer priority */
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CONFIG_PIC32MX_T2PRIO
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CONFIG_PIC32MX_T3PRIO
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CONFIG_PIC32MX_T4PRIO
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CONFIG_PIC32MX_T5PRIO
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CONFIG_PIC32MX_IC1PRIO
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CONFIG_PIC32MX_IC2PRIO
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CONFIG_PIC32MX_IC3PRIO
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CONFIG_PIC32MX_IC4PRIO
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CONFIG_PIC32MX_IC5PRIO
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CONFIG_PIC32MX_OC1PRIO
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CONFIG_PIC32MX_OC2PRIO
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CONFIG_PIC32MX_OC3PRIO
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CONFIG_PIC32MX_OC4PRIO
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CONFIG_PIC32MX_OC5PRIO
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CONFIG_PIC32MX_I2C1PRIO
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CONFIG_PIC32MX_I2C2PRIO
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CONFIG_PIC32MX_SPI1PRIO
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CONFIG_PIC32MX_SPI2PRIO
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CONFIG_PIC32MX_UART1PRIO
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CONFIG_PIC32MX_UART2PRIO
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CONFIG_PIC32MX_PMPPRIO
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CONFIG_PIC32MX_ADCPRIO
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CONFIG_PIC32MX_CVRPRIO
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CONFIG_PIC32MX_CM1PRIO
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CONFIG_PIC32MX_CM2PRIO
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CONFIG_PIC32MX_OSCPRIO
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CONFIG_PIC32MX_DDPPRIO
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CONFIG_PIC32MX_FLASHPRIO
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CONFIG_PIC32MX_BMXPRIO
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CONFIG_PIC32MX_DMAPRIO
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CONFIG_PIC32MX_CHEPRIO
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CONFIG_PIC32MX_USBPRIO
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CONFIG_PIC32MX_IOPORTAPRIO
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CONFIG_PIC32MX_IOPORTBPRIO
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CONFIG_PIC32MX_IOPORTCPRIO
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CONFIG_PIC32MX_IOPORTDPRIO
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CONFIG_PIC32MX_IOPORTEPRIO
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CONFIG_PIC32MX_IOPORTFPRIO
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CONFIG_PIC32MX_IOPORTGPRIO
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2011-05-17 00:20:26 +02:00
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PIC32MXx 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. Must be
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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
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CONFIG_UARTn_2STOP - Two stop bits
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PIC32MXx USB Device Configuration
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PIC32MXx USB Host Configuration (the PIC32MX does not support USB Host)
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Configurations
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^^^^^^^^^^^^^^
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Each PIC32MX configuration is maintained in a sudirectory and can be
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selected as follow:
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cd tools
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./configure.sh pcblogic-pic32mx/<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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apps/examples/ostest.
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