README ====== This README discusses issues unique to NuttX configurations for the Atmel SAM4E-EK development. This board features the SAM4E16 MCU running at 96 or 120MHz. Contents ======== - Development Environment - GNU Toolchain Options - IDEs - NuttX EABI "buildroot" Toolchain - NuttX OABI "buildroot" Toolchain - NXFLAT Toolchain - Atmel Studio 6.1 - Loading Code with J-Link - Writing to FLASH using SAM-BA - LEDs - Serial Console - Networking Support - SAM4E-EK-specific Configuration Options - Configurations Development Environment ======================= Either Linux or Cygwin on Windows can be used for the development environment. The source has been built only using the GNU toolchain (see below). Other toolchains will likely cause problems. Testing was performed using the Cygwin environment. GNU Toolchain Options ===================== The NuttX make system can be configured to support the various different toolchain options. All testing has been conducted using the NuttX buildroot toolchain. To use alternative toolchain, you simply need to add change of the following configuration options to your .config (or defconfig) file: CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYW=y : CodeSourcery under Windows CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYL=y : CodeSourcery under Linux CONFIG_ARMV7M_TOOLCHAIN_ATOLLIC=y : Atollic toolchain for Windos CONFIG_ARMV7M_TOOLCHAIN_DEVKITARM=y : devkitARM under Windows CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT=y : NuttX buildroot under Linux or Cygwin (default) CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIL=y : Generic GCC ARM EABI toolchain for Linux CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIW=y : Generic GCC ARM EABI toolchain for Windows You may also have to modify the PATH in the setenv.h file if your make cannot find the tools. NOTE about Windows native toolchains ------------------------------------ There are basically three kinds of GCC toolchains that can be used: 1. A Linux native toolchain in a Linux environment, 2. The buildroot Cygwin tool chain built in the Cygwin environment, 3. A Windows native toolchain. There are several limitations to using a Windows based toolchain (#3) 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 no 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 paths which do not work with the Cygwin make. MKDEP = $(TOPDIR)/tools/mknulldeps.sh IDEs ==== NuttX is built using command-line make. It can be used with an IDE, but some effort will be required to create the project (There is a simple RIDE project in the RIDE subdirectory). Makefile Build -------------- Under Eclipse, it is pretty easy to set up an "empty makefile project" and simply use the NuttX makefile to build the system. That is almost for free under Linux. Under Windows, you will need to set up the "Cygwin GCC" empty makefile project in order to work with Windows (Google for "Eclipse Cygwin" - there is a lot of help on the internet). Native Build ------------ Here are a few tips before you start that effort: 1) Select the toolchain that you will be using in your .config file 2) Start the NuttX build at least one time from the Cygwin command line before trying to create your project. This is necessary to create certain auto-generated files and directories that will be needed. 3) Set up include pathes: You will need include/, arch/arm/src/sam34, arch/arm/src/common, arch/arm/src/armv7-m, and sched/. 4) All assembly files need to have the definition option -D __ASSEMBLY__ on the command line. Startup files will probably cause you some headaches. The NuttX startup file is arch/arm/src/sam34/sam_vectors.S. You may need to build NuttX one time from the Cygwin command line in order to obtain the pre-built startup object needed by RIDE. NuttX EABI "buildroot" Toolchain ================================ A GNU GCC-based toolchain is assumed. The files */setenv.sh should be modified to point to the correct path to the Cortex-M3 GCC toolchain (if different from the default in your PATH variable). If you have no Cortex-M3 toolchain, one can be downloaded from the NuttX SourceForge download site (https://sourceforge.net/projects/nuttx/files/buildroot/). This GNU toolchain builds and executes in the Linux or Cygwin environment. 1. You must have already configured Nuttx in /nuttx. cd tools ./configure.sh sam4e-ek/ 2. Download the latest buildroot package into 3. unpack the buildroot tarball. The resulting directory may have versioning information on it like buildroot-x.y.z. If so, rename /buildroot-x.y.z to /buildroot. 4. cd /buildroot 5. cp configs/cortexm3-eabi-defconfig-4.6.3 .config 6. make oldconfig 7. make 8. Edit setenv.h, if necessary, so that the PATH variable includes the path to the newly built binaries. See the file configs/README.txt in the buildroot source tree. That has more details PLUS some special instructions that you will need to follow if you are building a Cortex-M3 toolchain for Cygwin under Windows. NOTE: Unfortunately, the 4.6.3 EABI toolchain is not compatible with the the NXFLAT tools. See the top-level TODO file (under "Binary loaders") for more information about this problem. If you plan to use NXFLAT, please do not use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain. See instructions below. NuttX OABI "buildroot" Toolchain ================================ The older, OABI buildroot toolchain is also available. To use the OABI toolchain: 1. When building the buildroot toolchain, either (1) modify the cortexm3-eabi-defconfig-4.6.3 configuration to use EABI (using 'make menuconfig'), or (2) use an exising OABI configuration such as cortexm3-defconfig-4.3.3 2. Modify the Make.defs file to use the OABI conventions: +CROSSDEV = arm-nuttx-elf- +ARCHCPUFLAGS = -mtune=cortex-m3 -march=armv7-m -mfloat-abi=soft +NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-gotoff.ld -no-check-sections -CROSSDEV = arm-nuttx-eabi- -ARCHCPUFLAGS = -mcpu=cortex-m3 -mthumb -mfloat-abi=soft -NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-pcrel.ld -no-check-sections NXFLAT Toolchain ================ If you are *not* using the NuttX buildroot toolchain and you want to use the NXFLAT tools, then you will still have to build a portion of the buildroot tools -- just the NXFLAT tools. The buildroot with the NXFLAT tools can be downloaded from the NuttX SourceForge download site (https://sourceforge.net/projects/nuttx/files/). This GNU toolchain builds and executes in the Linux or Cygwin environment. 1. You must have already configured Nuttx in /nuttx. cd tools ./configure.sh sam4e-ek/ 2. Download the latest buildroot package into 3. unpack the buildroot tarball. The resulting directory may have versioning information on it like buildroot-x.y.z. If so, rename /buildroot-x.y.z to /buildroot. 4. cd /buildroot 5. cp configs/cortexm3-defconfig-nxflat .config 6. make oldconfig 7. make 8. Edit setenv.h, if necessary, so that the PATH variable includes the path to the newly builtNXFLAT binaries. Atmel Studio 6.1 ================ You can use Atmel Studio 6.1 to load and debug code. - To load code into FLASH: Tools menus: Tools -> Device Programming. Configure the debugger and chip and you are in business. - Debugging the NuttX Object File: 1) Rename object file from nutt to nuttx.elf. That is an extension that will be recognized by the file menu. 2) Select the project name, the full path to the NuttX object (called just nuttx with no extension), and chip. Take the time to resolve all of the source file linkages or else you will not have source level debug! File menu: File -> Open -> Open object file for debugging - Select nuttx.elf object file - Select AT91SAM4E16 - Select files for symbols as desired - Select debugger 3) Debug menu: Debug -> Start debugging and break - This will reload the nuttx.elf file into FLASH STATUS: At this point, Atmel Studio 6.1 claims that my object files are not readable. A little more needs to be done to wring out this procedure. Loading Code into SRAM with J-Link ================================== Loading code with the Segger tools and GDB ------------------------------------------ 1) Change directories into the directory where you built NuttX. 2) Start the GDB server and wait until it is ready to accept GDB connections. 3) Then run GDB like this: $ arm-none-eabi-gdb (gdb) target remote localhost:2331 (gdb) mon reset (gdb) load nuttx (gdb) ... start debugging ... Loading code using J-Link Commander ---------------------------------- J-Link> r J-Link> loadbin
J-Link> setpc
J-Link> ... start debugging ... STATUS: As of this writing, I have no been successful writing to FLASH using the GDB server. I think that this is because of issues with GPNVM1 settings and flash lock bits. In any event, the GDB server works great for debugging after writing the program to FLASH using SAM-BA. Writing to FLASH using SAM-BA ============================= Assumed starting configuration: 1. You have installed the J-Link USB driver Using SAM-BA to write to FLASH: 1. Start the SAM-BA application, selecting (1) the SAM-ICE/J-Link port, and (2) board = at91sam4e16-ek. 2. The SAM-BA menu should appear. 3. Select the FLASH tab and enable FLASH access 4. "Send" the file to flash 5. Enable "Boot from Flash (GPNVM1) 6. Reset the board. STATUS: Works great! LEDs ==== The SAM4E-EK board has three, user-controllable LEDs labelled D2 (blue), D3 (amber), and D4 (green) on the board. Usage of these LEDs is defined in include/board.h and src/up_leds.c. They are encoded as follows: SYMBOL Meaning D3* D2 D4 ------------------- ----------------------- ------- ------- ------- LED_STARTED NuttX has been started OFF OFF OFF LED_HEAPALLOCATE Heap has been allocated OFF OFF ON LED_IRQSENABLED Interrupts enabled OFF ON OFF LED_STACKCREATED Idle stack created OFF ON ON LED_INIRQ In an interrupt** N/C FLASH N/C LED_SIGNAL In a signal handler*** N/C N/C FLASH LED_ASSERTION An assertion failed FLASH N/C N/C LED_PANIC The system has crashed FLASH N/C N/C * If D2 and D4 are statically on, then NuttX probably failed to boot and these LEDs will give you some indication of where the failure was ** The normal state is D3=OFF, D4=ON and D2 faintly glowing. This faint glow is because of timer interrupts that result in the LED being illuminated on a small proportion of the time. *** D4 may also flicker normally if signals are processed. Serial Console ============== By default, all of these configurations use UART0 for the NuttX serial console. UART0 corresponds to the DB-9 connector J17 labelled "DBGU". This is a male connector and will require a female-to-female, NUL modem cable to connect to a PC. An alternate is USART1 which connects to the other DB-9 connector labelled "USART1". USART1 is not enabled by default unless specifically noted otherwise in the configuration description. A NUL modem cable must be used with the port as well. NOTE: To avoid any electrical conflict, the RS232 and RS485 transceiver are isolated from the receiving line PA21. - Chose RS485 channel: Close 1-2 pins on JP11 and set PA23 to high level - Chose RS232 channel: Close 2-3 pins on JP11 and set PA23 to low level By default serial console is configured for 115000, 8-bit, 1 stop bit, and no parity. Networking ========== Networking support via the can be added to NSH by selecting the following configuration options. Selecting the EMAC peripheral ----------------------------- System Type -> SAM34 Peripheral Support CONFIG_SAM34_EMAC=y : Enable the EMAC peripheral System Type -> EMAC device driver options CONFIG_SAM34_EMAC_NRXBUFFERS=16 : Set aside some RS and TX buffers CONFIG_SAM34_EMAC_NTXBUFFERS=4 CONFIG_SAM34_EMAC_PHYADDR=1 : KSZ8051 PHY is at address 1 CONFIG_SAM34_EMAC_AUTONEG=y : Use autonegotiation CONFIG_SAM34_EMAC_MII=y : Only the MII interface is supported CONFIG_SAM34_EMAC_PHYSR=30 : Address of PHY status register on KSZ8051 CONFIG_SAM34_EMAC_PHYSR_ALTCONFIG=y : Needed for KSZ8051 CONFIG_SAM34_EMAC_PHYSR_ALTMODE=0x7 : " " " " " " CONFIG_SAM34_EMAC_PHYSR_10HD=0x1 : " " " " " " CONFIG_SAM34_EMAC_PHYSR_100HD=0x2 : " " " " " " CONFIG_SAM34_EMAC_PHYSR_10FD=0x5 : " " " " " " CONFIG_SAM34_EMAC_PHYSR_100FD=0x6 : " " " " " " PHY selection. Later in the configuration steps, you will need to select the KSZ8051 PHY for EMAC (See below) Networking Support CONFIG_NET=y : Enable Neworking CONFIG_NET_SOCKOPTS=y : Enable socket operations CONFIG_NET_BUFSIZE=562 : Maximum packet size (MTD) 1518 is more standard CONFIG_NET_RECEIVE_WINDOW=536 : Should be the same as CONFIG_NET_BUFSIZE CONFIG_NET_TCP=y : Enable TCP/IP networking CONFIG_NET_TCPBACKLOG=y : Support TCP/IP backlog CONFIG_NET_TCP_READAHEAD_BUFSIZE=536 Read-ahead buffer size CONFIG_NET_UDP=y : Enable UDP networking CONFIG_NET_BROADCAST=y : Needed for DNS name resolution CONFIG_NET_ICMP=y : Enable ICMP networking CONFIG_NET_ICMP_PING=y : Needed for NSH ping command : Defaults should be okay for other options Device drivers -> Network Device/PHY Support CONFIG_NETDEVICES=y : Enabled PHY selection CONFIG_ETH0_PHY_KSZ8051=y : Select the KSZ8051 PHY (for EMAC) Application Configuration -> Network Utilities CONFIG_NETUTILS_RESOLV=y : Enable host address resolution CONFIG_NETUTILS_TELNETD=y : Enable the Telnet daemon CONFIG_NETUTILS_TFTPC=y : Enable TFTP data file transfers for get and put commands CONFIG_NETUTILS_UIPLIB=y : Network library support is needed CONFIG_NETUTILS_WEBCLIENT=y : Needed for wget support : Defaults should be okay for other options Application Configuration -> NSH Library CONFIG_NSH_TELNET=y : Enable NSH session via Telnet CONFIG_NSH_IPADDR=0x0a000002 : Select a fixed IP address CONFIG_NSH_DRIPADDR=0x0a000001 : IP address of gateway/host PC CONFIG_NSH_NETMASK=0xffffff00 : Netmask CONFIG_NSH_NOMAC=y : Need to make up a bogus MAC address : Defaults should be okay for other options You can also enable enable the DHCPC client for networks that use dynamically assigned address: Application Configuration -> Network Utilities CONFIG_NETUTILS_DHCPC=y : Enables the DHCP client Networking Support CONFIG_NET_UDP=y : Depends on broadcast UDP Application Configuration -> NSH Library CONFIG_NET_BROADCAST=y CONFIG_NSH_DHCPC=y : Tells NSH to use DHCPC, not : the fixed addresses Using the network with NSH -------------------------- So what can you do with this networking support? First you see that NSH has several new network related commands: ifconfig, ifdown, ifup: Commands to help manage your network get and put: TFTP file transfers wget: HTML file transfers ping: Check for access to peers on the network Telnet console: You can access the NSH remotely via telnet. You can also enable other add on features like full FTP or a Web Server or XML RPC and others. There are also other features that you can enable like DHCP client (or server) or network name resolution. By default, the IP address of the SAM4E-EK will be 10.0.0.2 and it will assume that your host is the gateway and has the IP address 10.0.0.1. nsh> ifconfig eth0 HWaddr 00:e0:de:ad:be:ef at UP IPaddr:10.0.0.2 DRaddr:10.0.0.1 Mask:255.255.255.0 You can use ping to test for connectivity to the host (Careful, Window firewalls usually block ping-related ICMP traffic). On the target side, you can: nsh> ping 10.0.0.1 PING 10.0.0.1 56 bytes of data 56 bytes from 10.0.0.1: icmp_seq=1 time=0 ms 56 bytes from 10.0.0.1: icmp_seq=2 time=0 ms 56 bytes from 10.0.0.1: icmp_seq=3 time=0 ms 56 bytes from 10.0.0.1: icmp_seq=4 time=0 ms 56 bytes from 10.0.0.1: icmp_seq=5 time=0 ms 56 bytes from 10.0.0.1: icmp_seq=6 time=0 ms 56 bytes from 10.0.0.1: icmp_seq=7 time=0 ms 56 bytes from 10.0.0.1: icmp_seq=8 time=0 ms 56 bytes from 10.0.0.1: icmp_seq=9 time=0 ms 56 bytes from 10.0.0.1: icmp_seq=10 time=0 ms 10 packets transmitted, 10 received, 0% packet loss, time 10100 ms NOTE: In this configuration is is normal to have packet loss > 0% the first time you ping due to the default handling of the ARP table. On the host side, you should also be able to ping the SAM4E-EK: $ ping 10.0.0.2 You can also log into the NSH from the host PC like this: $ telnet 10.0.0.2 Trying 10.0.0.2... Connected to 10.0.0.2. Escape character is '^]'. sh_telnetmain: Session [3] Started NuttShell (NSH) NuttX-6.31 nsh> help help usage: help [-v] [] [ echo ifconfig mkdir mw sleep ? exec ifdown mkfatfs ping test cat exit ifup mkfifo ps umount cp free kill mkrd put usleep cmp get losetup mh rm wget dd help ls mount rmdir xd df hexdump mb mv sh Builtin Apps: nsh> NOTE: If you enable this feature, you experience a delay on booting. That is because the start-up logic waits for the network connection to be established before starting NuttX. In a real application, you would probably want to do the network bringup on a separate thread so that access to the NSH prompt is not delayed. This delay will be especially long if the board is not connected to a network because additional time will be required to fail with timeout errors. SAM4E-EK-specific 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="sam34" CONFIG_ARCH_CHIP_name - For use in C code to identify the exact chip: CONFIG_ARCH_CHIP_SAM34 CONFIG_ARCH_CHIP_SAM3U CONFIG_ARCH_CHIP_ATSAM3U4 CONFIG_ARCH_BOARD - Identifies the configs subdirectory and hence, the board that supports the particular chip or SoC. CONFIG_ARCH_BOARD=sam4e-ek (for the SAM4E-EK development board) CONFIG_ARCH_BOARD_name - For use in C code CONFIG_ARCH_BOARD_SAM4EEK=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 (SRAM in this case): CONFIG_RAM_SIZE=0x00020000 (128Kb) CONFIG_RAM_START - The start address of installed DRAM CONFIG_RAM_START=0x20000000 CONFIG_ARCH_IRQPRIO - The SAM3U supports interrupt prioritization CONFIG_ARCH_IRQPRIO=n 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_SAM34_SPI0 - Serial Peripheral Interface 0 (SPI0) CONFIG_SAM34_SPI1 - Serial Peripheral Interface 1 (SPI1) CONFIG_SAM34_SSC - Synchronous Serial Controller (SSC) CONFIG_SAM34_TC0 - Timer/Counter 0 (TC0) CONFIG_SAM34_TC1 - Timer/Counter 1 (TC1) CONFIG_SAM34_TC2 - Timer/Counter 2 (TC2) CONFIG_SAM34_TC3 - Timer/Counter 3 (TC3) CONFIG_SAM34_TC4 - Timer/Counter 4 (TC4) CONFIG_SAM34_TC5 - Timer/Counter 5 (TC5) CONFIG_SAM34_TC6 - Timer/Counter 6 (TC6) CONFIG_SAM34_TC7 - Timer/Counter 7 (TC6) CONFIG_SAM34_TC8 - Timer/Counter 6 (TC8) CONFIG_SAM34_PWM - Pulse Width Modulation (PWM) Controller CONFIG_SAM34_TWIM0 - Two-wire Master Interface 0 (TWIM0) CONFIG_SAM34_TWIS0 - Two-wire Slave Interface 0 (TWIS0) CONFIG_SAM34_TWIM1B - Two-wire Master Interface 1 (TWIM1) CONFIG_SAM34_TWIS1 - Two-wire Slave Interface 1 (TWIS1) CONFIG_SAM34_UART0 - UART 0 CONFIG_SAM34_UART1 - UART 1 CONFIG_SAM34_USART0 - USART 0 CONFIG_SAM34_USART1 - USART 1 CONFIG_SAM34_USART2 - USART 2 CONFIG_SAM34_USART3 - USART 3 CONFIG_SAM34_AFEC0 - Analog Front End 0 CONFIG_SAM34_AFEC1 - Analog Front End 1 CONFIG_SAM34_DACC - Digital-to-Analog Converter CONFIG_SAM34_ACC - Analog Comparator CONFIG_SAM34_EMAC - Ethernet MAC CONFIG_SAM34_CAN0 - CAN 0 CONFIG_SAM34_CAN1 - CAN 1 CONFIG_SAM34_SMC - Static Memory Controller CONFIG_SAM34_NAND - NAND support CONFIG_SAM34_PDCA - Peripheral DMA controller CONFIG_SAM34_DMAC0 - DMA controller CONFIG_SAM34_UDP - USB 2.0 Full-Speed device CONFIG_SAM34_CHIPID - Chip ID CONFIG_SAM34_RTC - Real Time Clock CONFIG_SAM34_RTT - Real Time Timer CONFIG_SAM34_WDT - Watchdog Timer CONFIG_SAM34_EIC - Interrupt controller CONFIG_SAM34_HSMCI - High Speed Multimedia Card Interface Some subsystems can be configured to operate in different ways. The drivers need to know how to configure the subsystem. CONFIG_GPIOA_IRQ CONFIG_GPIOB_IRQ CONFIG_GPIOC_IRQ CONFIG_GPIOD_IRQ CONFIG_GPIOE_IRQ CONFIG_GPIOF_IRQ CONFIG_GPIOG_IRQ CONFIG_GPIOH_IRQ CONFIG_GPIOJ_IRQ CONFIG_GPIOK_IRQ CONFIG_GPIOL_IRQ CONFIG_GPIOM_IRQ CONFIG_GPION_IRQ CONFIG_GPIOP_IRQ CONFIG_GPIOQ_IRQ CONFIG_USART0_ISUART CONFIG_USART1_ISUART CONFIG_USART2_ISUART CONFIG_USART3_ISUART SAM3U specific device driver settings CONFIG_U[S]ARTn_SERIAL_CONSOLE - selects the USARTn (n=0,1,2,3) or UART m (m=4,5) for the console and ttys0 (default is the USART1). CONFIG_U[S]ARTn_RXBUFSIZE - Characters are buffered as received. This specific the size of the receive buffer CONFIG_U[S]ARTn_TXBUFSIZE - Characters are buffered before being sent. This specific the size of the transmit buffer CONFIG_U[S]ARTn_BAUD - The configure BAUD of the UART. Must be CONFIG_U[S]ARTn_BITS - The number of bits. Must be either 7 or 8. CONFIG_U[S]ARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity CONFIG_U[S]ARTn_2STOP - Two stop bits LCD Options. Other than the standard LCD configuration options (see configs/README.txt), the SAM4E-EK driver also supports: CONFIG_LCD_PORTRAIT - Present the display in the standard 240x320 "Portrait" orientation. Default: The display is rotated to support a 320x240 "Landscape" orientation. Configurations ============== Information Common to All Configurations ---------------------------------------- Each SAM4E-EK configuration is maintained in a sub-directory and can be selected as follow: cd tools ./configure.sh sam4e-ek/ cd - . ./setenv.sh Before sourcing the setenv.sh file above, you should examine it and perform edits as necessary so that BUILDROOT_BIN is the correct path to the directory than holds your toolchain binaries. And then build NuttX by simply typing the following. At the conclusion of the make, the nuttx binary will reside in an ELF file called, simply, nuttx. make The that is provided above as an argument to the tools/configure.sh must be is one of the following. 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 and misc/tools/ b. Execute 'make menuconfig' in nuttx/ in order to start the reconfiguration process. 2. Unless stated otherwise, all configurations generate console output on UART0 (J3). 3. All of these configurations are set up to build under Linux using the EABI buildroot toolchain (unless stated otherwise in the description of the configuration). That build selection can easily be reconfigured using 'make menuconfig'. Here are the relevant current settings: Build Setup: CONFIG_HOST_LINUX=y : Linux or other pure POSIX invironment System Type -> Toolchain: CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT=y : Buildroot toolchain CONFIG_ARMV7M_OABI_TOOLCHAIN=n : EABI (Not OABI If you want to use the Atmel GCC toolchain, for example, here are the steps to do so: Build Setup: CONFIG_HOST_WINDOWS=y : Windows CONFIG_HOST_CYGWIN=y : Using Cygwin or other POSIX environment System Type -> Toolchain: CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIW=y : General GCC EABI toolchain under windows Library Routines -> CONFIG_CXX_NEWLONG=n : size_t is an unsigned int, not long This re-configuration should be done before making NuttX or else the subsequent 'make' will fail. If you have already attempted building NuttX then you will have to 1) 'make distclean' to remove the old configuration, 2) 'cd tools; ./configure.sh sam4e-ek/ksnh' to start with a fresh configuration, and 3) perform the configuration changes above. Also, make sure that your PATH variable has the new path to your Atmel tools. Try 'which arm-none-eabi-gcc' to make sure that you are selecting the right tool. setenv.sh is available for you to use to set or PATH variable. The path in the that file may not, however, be correct for your installation. See also the "NOTE about Windows native toolchains" in the section call "GNU Toolchain Options" above. Configuration sub-directories ----------------------------- nsh: Configures the NuttShell (nsh) located at examples/nsh. The Configuration enables both the serial and telnetd NSH interfaces. NOTES: 1. NSH built-in applications are supported. However, there are no built-in applications built with the default configuration. Binary Formats: CONFIG_BUILTIN=y : Enable support for built-in programs Applicaton Configuration: CONFIG_NSH_BUILTIN_APPS=y : Enable starting apps from NSH command line 2. This configuration has the network enabled by default. This can be easily disabled or reconfigured (See see the network related configuration settings above in the section entitled "Networking"). NOTE: In boot-up sequence is very simple in this example; all initialization is done sequential (vs. in parallel) and so you will not see the NSH prompt until all initialization is complete. The network bring-up in particular will add some delay before the NSH prompt appears. In a real application, you would probably want to do the network bringup on a separate thread so that access to the NSH prompt is not delayed. This delay will be especially long if the board is not connected to a network because additional time will be required to fail with timeout errors. 3. This configuration supports a network with fixed IP address. You may have to change these settings for your network: CONFIG_NSH_IPADDR=0x0a000002 : IP address: 10.0.0.2 CONFIG_NSH_DRIPADDR=0x0a000001 : Gateway: 10.0.0.1 CONFIG_NSH_NETMASK=0xffffff00 : Netmask: 255.255.255.0 You can also enable enable the DHCPC client for networks that use dynamically assigned address: CONFIG_NETUTILS_DHCPC=y : Enables the DHCP client CONFIG_NET_UDP=y : Depends on broadcast UDP CONFIG_NET_BROADCAST=y CONFIG_NSH_DHCPC=y : Tells NSH to use DHCPC, not : the fixed addresses 4. This configuration has been used for verifying the touchscreen on on the SAM4E-EK LCD. With these modifications, you can include the touchscreen test program at apps/examples/touchscreen as an NSH built-in application. You can enable the touchscreen and test by modifying the default configuration in the following ways: Device Drivers CONFIG_SPI=y : Enable SPI support CONFIG_SPI_EXCHANGE=y : The exchange() method is supported CONFIG_SPI_OWNBUS=y : Smaller code if this is the only SPI device CONFIG_INPUT=y : Enable support for input devices CONFIG_INPUT_ADS7843E=y : Enable support for the XPT2046 CONFIG_ADS7843E_SPIDEV=2 : Use SPI CS 2 for communication CONFIG_ADS7843E_SPIMODE=0 : Use SPI mode 0 CONFIG_ADS7843E_FREQUENCY=1000000 : SPI BAUD 1MHz CONFIG_ADS7843E_SWAPXY=y : If landscpe orientation CONFIG_ADS7843E_THRESHX=51 : These will probably need to be tuned CONFIG_ADS7843E_THRESHY=39 System Type -> Peripherals: CONFIG_SAM34_SPI0=y : Enable support for SPI System Type: CONFIG_GPIO_IRQ=y : GPIO interrupt support CONFIG_GPIOA_IRQ=y : Enable GPIO interrupts from port A RTOS Features: CONFIG_DISABLE_SIGNALS=n : Signals are required Library Support: CONFIG_SCHED_WORKQUEUE=y : Work queue support required Applicaton Configuration: CONFIG_EXAMPLES_TOUCHSCREEN=y : Enable the touchscreen built-int test Defaults should be okay for related touchscreen settings. Touchscreen debug output on UART0 can be enabled with: Build Setup: CONFIG_DEBUG=y : Enable debug features CONFIG_DEBUG_VERBOSE=y : Enable verbose debug output CONFIG_DEBUG_INPUT=y : Enable debug output from input devices 4. Enabling HSMCI support. The SAM3U-KE provides a an SD memory card slot. Support for the SD slot can be enabled with the following settings: System Type->ATSAM3/4 Peripheral Support CONFIG_SAM34_HSMCI=y : Enable HSMCI support CONFIG_SAM34_DMAC0=y : DMAC support is needed by HSMCI System Type CONFIG_SAM34_GPIO_IRQ=y : PIO interrupts needed CONFIG_SAM34_GPIOA_IRQ=y : Card detect pin is on PIOA Device Drivers -> MMC/SD Driver Support CONFIG_MMCSD=y : Enable MMC/SD support CONFIG_MMSCD_NSLOTS=1 : One slot per driver instance CONFIG_MMCSD_HAVECARDDETECT=y : Supports card-detect PIOs CONFIG_MMCSD_SDIO=y : SDIO-based MMC/SD support CONFIG_SDIO_DMA=y : Use SDIO DMA CONFIG_SDIO_BLOCKSETUP=y : Needs to know block sizes Library Routines CONFIG_SCHED_WORKQUEUE=y : Driver needs work queue support Application Configuration -> NSH Library CONFIG_NSH_ARCHINIT=y : NSH board-initialization STATUS: 2014-3-13: The basic NSH serial console is working. Network support has been verified. HSMCI and touchscreen have not been tested (the above notes came from the SAM3U-EK and have not been yet been tested on the SAM4E-EK).