README ^^^^^^ README for NuttX port to the mbed.org LPC1768 board (http://mbed.org/) Contents ^^^^^^^^ mbed Configuration Options USB Host Configuration Configurations mbed Configuration Options ^^^^^^^^^^^^^^^^^^^^^^^^^^ CONFIG_ARCH - Identifies the arch/ subdirectory. This should be set to: CONFIG_ARCH=arm CONFIG_ARCH_family - For use in C code: CONFIG_ARCH_ARM=y CONFIG_ARCH_architecture - For use in C code: CONFIG_ARCH_CORTEXM3=y CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory CONFIG_ARCH_CHIP=lpc17xx CONFIG_ARCH_CHIP_name - For use in C code to identify the exact chip: CONFIG_ARCH_CHIP_LPC1768=y CONFIG_ARCH_BOARD - Identifies the boards/ subdirectory and hence, the board that supports the particular chip or SoC. CONFIG_ARCH_BOARD=mbed (for the mbed.org board) CONFIG_ARCH_BOARD_name - For use in C code CONFIG_ARCH_BOARD_MBED=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_RAM_SIZE - Describes the installed DRAM (CPU SRAM in this case): CONFIG_RAM_SIZE=(32*1024) (32Kb) There is an additional 32Kb of SRAM in AHB SRAM banks 0 and 1. CONFIG_RAM_START - The start address of installed DRAM CONFIG_RAM_START=0x10000000 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 Individual subsystems can be enabled: CONFIG_LPC17_40_MAINOSC=y CONFIG_LPC17_40_PLL0=y CONFIG_LPC17_40_PLL1=n CONFIG_LPC17_40_ETHERNET=n CONFIG_LPC17_40_USBHOST=n CONFIG_LPC17_40_USBOTG=n CONFIG_LPC17_40_USBDEV=n CONFIG_LPC17_40_UART0=y CONFIG_LPC17_40_UART1=n CONFIG_LPC17_40_UART2=n CONFIG_LPC17_40_UART3=n CONFIG_LPC17_40_CAN1=n CONFIG_LPC17_40_CAN2=n CONFIG_LPC17_40_SPI=n CONFIG_LPC17_40_SSP0=n CONFIG_LPC17_40_SSP1=n CONFIG_LPC17_40_I2C0=n CONFIG_LPC17_40_I2C1=n CONFIG_LPC17_40_I2S=n CONFIG_LPC17_40_TMR0=n CONFIG_LPC17_40_TMR1=n CONFIG_LPC17_40_TMR2=n CONFIG_LPC17_40_TMR3=n CONFIG_LPC17_40_RIT=n CONFIG_LPC17_40_PWM0=n CONFIG_LPC17_40_MCPWM=n CONFIG_LPC17_40_QEI=n CONFIG_LPC17_40_RTC=n CONFIG_LPC17_40_WDT=n CONFIG_LPC17_40_ADC=n CONFIG_LPC17_40_DAC=n CONFIG_LPC17_40_GPDMA=n CONFIG_LPC17_40_FLASH=n LPC17xx/LPC40xx 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 LPC17xx/LPC40xx specific CAN device driver settings. These settings all require CONFIG_CAN: CONFIG_CAN_EXTID - Enables support for the 29-bit extended ID. Default Standard 11-bit IDs. CONFIG_LPC17_40_CAN1_BAUD - CAN1 BAUD rate. Required if CONFIG_LPC17_40_CAN1 is defined. CONFIG_LPC17_40_CAN2_BAUD - CAN1 BAUD rate. Required if CONFIG_LPC17_40_CAN2 is defined. CONFIG_LPC17_40_CAN1_DIVISOR - CAN1 is clocked at CCLK divided by this number. (the CCLK frequency is divided by this number to get the CAN clock). Options = {1,2,4,6}. Default: 4. CONFIG_LPC17_40_CAN2_DIVISOR - CAN2 is clocked at CCLK divided by this number. (the CCLK frequency is divided by this number to get the CAN clock). Options = {1,2,4,6}. Default: 4. CONFIG_LPC17_40_CAN_TSEG1 - The number of CAN time quanta in segment 1. Default: 6 CONFIG_LPC17_40_CAN_TSEG2 = the number of CAN time quanta in segment 2. Default: 7 LPC17xx/LPC40xx specific PHY/Ethernet device driver settings. These setting also require CONFIG_NET and CONFIG_LPC17_40_ETHERNET. CONFIG_ETH0_PHY_KS8721 - Selects Micrel KS8721 PHY CONFIG_LPC17_40_PHY_AUTONEG - Enable auto-negotiation CONFIG_LPC17_40_PHY_SPEED100 - Select 100Mbit vs. 10Mbit speed. CONFIG_LPC17_40_PHY_FDUPLEX - Select full (vs. half) duplex CONFIG_LPC17_40_EMACRAM_SIZE - Size of EMAC RAM. Default: 16Kb CONFIG_LPC17_40_ETH_NTXDESC - Configured number of Tx descriptors. Default: 18 CONFIG_LPC17_40_ETH_NRXDESC - Configured number of Rx descriptors. Default: 18 CONFIG_LPC17_40_ETH_WOL - Enable Wake-up on Lan (not fully implemented). CONFIG_NET_REGDEBUG - Enabled low level register debug. Also needs CONFIG_DEBUG_FEATURES. CONFIG_NET_DUMPPACKET - Dump all received and transmitted packets. Also needs CONFIG_DEBUG_FEATURES. CONFIG_LPC17_40_ETH_HASH - Enable receipt of near-perfect match frames. CONFIG_LPC17_40_MULTICAST - Enable receipt of multicast (and unicast) frames. Automatically set if CONFIG_NET_MCASTGROUP is selected. LPC17xx/LPC40xx USB Device Configuration CONFIG_LPC17_40_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_LPC17_40_USBDEV_EPFAST_INTERRUPT Enable high priority interrupts. I have no idea why you might want to do that CONFIG_LPC17_40_USBDEV_NDMADESCRIPTORS Number of DMA descriptors to allocate in SRAM. CONFIG_LPC17_40_USBDEV_DMA Enable lpc17xx/lpc40xx-specific DMA support CONFIG_LPC17_40_USBDEV_NOVBUS Define if the hardware implementation does not support the VBUS signal CONFIG_LPC17_40_USBDEV_NOLED Define if the hardware implementation does not support the LED output LPC17xx/LPC40xx USB Host Configuration CONFIG_LPC17_40_OHCIRAM_SIZE Total size of OHCI RAM (in AHB SRAM Bank 1) CONFIG_LP17_USBHOST_NEDS Number of endpoint descriptors CONFIG_LP17_USBHOST_NTDS Number of transfer descriptors CONFIG_LPC17_40_USBHOST_TDBUFFERS Number of transfer descriptor buffers CONFIG_LPC17_40_USBHOST_TDBUFSIZE Size of one transfer descriptor buffer CONFIG_LPC17_40_USBHOST_IOBUFSIZE Size of one end-user I/O buffer. This can be zero if the application can guarantee that all end-user I/O buffers reside in AHB SRAM. CONFIG_USERLED CONFIG_USERLED_LOWER Setup the generic driver to support the board leds, and so creates the device into /dev/userleds USB Host Configuration ^^^^^^^^^^^^^^^^^^^^^^ The mbed board can be easily modified to support a USB host interface (Remember to add 2 resistors of 15K to D+ and D- pins). The NuttShell (NSH) mbed can also be modified in order to support USB host operations. To make these modifications, do the following: 1. First configure to build the NSH configuration from the top-level NuttX directory: ./configure mbed/nsh 2. Then edit the top-level .config file to enable USB host. Make the following changes using 'make menuconfig': System Type -> LPC17xx/LPC40xx Peripheral Support CONFIG_LPC17_40_USBHOST=y : USB host controller driver support Device Drivers -> USB Host Driver Support CONFIG_USBHOST=y : USB host support CONFIG_USBHOST_ISOC_DISABLE=y : Not needed CONFIG_USBHOST_MSC=y : Mass storage class support Library Routines CONFIG_SCHED_WORKQUEUE=y : Enable worker thread When this change is made, NSH should be extended to support USB flash devices. When a FLASH device is inserted, you should see a device appear in the /dev (pseudo) directory. The device name should be like /dev/sda, /dev/sdb, etc. The USB mass storage device, is present it can be mounted from the NSH command line like: ls /dev mount -t vfat /dev/sda /mnt/flash Files on the connect USB flash device should then be accessible under the mountpoint /mnt/flash. Configurations ^^^^^^^^^^^^^^ General ------- Each mbed configuration is maintained in a sub-directory and can be selected as follow: tools/configure.sh mbed: Where is one of the mbed subdirectories described in the following paragraph. NOTES: 1. These configurations use the mconf-based configuration tool. To change any of these configurations using that tool, you should: a. Build and install the kconfig-mconf tool. See nuttx/README.txt see additional README.txt files in the NuttX tools repository. b. Execute 'make menuconfig' in nuttx/ in order to start the reconfiguration process. Configuration Sub-directories ----------------------------- nsh: Configures the NuttShell (nsh) located at examples/nsh. The Configuration enables only the serial NSH interfaces. See notes above for enabling USB host support in this configuration.