README ====== This README file discusses the port of NuttX to the Atmel SAM V71 Xplained Ultra Evaluation Kit (SAMV71-XULT). This board features the ATSAMV71Q21 Cortex-M7 microcontroller. Additional support of provided for the (optional) maXTouch Xplained Pro LCD. Contents ======== - Board Features - Open Issues - Serial Console - SD card - Automounter - LEDs and Buttons - AT24MAC402 Serial EEPROM - Networking - Audio Interface - maXTouch Xplained Pro - Debugging - Configurations Board Features ============== - ATSAMV71Q21 microcontroller: Cortex-M7, 300MHz, 2MiB FLASH, 384KiB SRAM, I/D-caches - One mechanical reset button - One power switch button - Two mechanical user pushbuttons - Two yellow user LEDs - Supercap backup - 12.0 MHz crystal - 32.768 kHz crystal - 2 MB SDRAM - 2 MB QSPI Flash - IEEE 802.3az 10Base-T/100Base-TX Ethernet RMII PHY - AT24MAC402 256KByte EEPROM with EUI-48 address - WM8904 stereo audio codec - ATA6561 CAN Transceiver - SD Card connector with SDIO support - Camera interface connector - MediaLB connector - Two Xplained Pro extension headers - One Xplained Pro LCD header - Coresight 20 connector for 4-bit ETM - Arduino due compatible shield connectors - External debugger connector - USB interface, device and host mode - Embedded Debugger with Data Gateway Interface and Virtual COM port (CDC) - External power input (5-14V) or USB powered See the Atmel website for further information about this board: - http://www.atmel.com/tools/atsamv71-xult.aspx Open Issues =========== The BASIC nsh configuration is fully function (as desribed below under "Configurations"). There are still open issues that need to be resolved: 1. SDRAM support has been implemented and tested using the nsh configuration (as desribed below). Currently the memory test does not pass. I am suspecting that this is because D-Cache is enabled when SDRAM is configured? 2. HSCMI. CONFIG_MMCSD_MULTIBLOCK_DISABLE=y is set to disable multi-block transfers only because I have not yet had a chance to verify this. The is very low priority to me but might be important to you if you are need very high performance SD card accesses. 3. HSMCI TX DMA is currently disabled for the SAMV7. There is some issue with the TX DMA setup (HSMCI TX DMA the same driver works with the SAMA5D4 which has a different DMA subsystem). This is a bug that needs to be resolved. DMA is enabled by these settings in the file arch/arm/src/samvy/sam_hsmci.c: #undef HSCMI_NORXDMA /* Define to disable RX DMA */ #define HSCMI_NOTXDMA 1 /* Define to disable TX DMA */ 4. There may also be some issues with removing and re-inserting SD cards (of course with appropriate mounting and unmounting). I all not sure of this and need to do more testing to characterize if the issue. 5. There is not yet any support for the following board features: QSPI or WM8904. Many drivers will port easily from either the SAM3/4 or from the SAMA5Dx. So there is still plenty to be done. 6. There is a port of the SAMA5D4-EK Ethernet driver to the SAMV71-XULT. This driver appears to be 100% functional with the following caveats: - There is a compiler optimization issue. At -O2, there is odd behavior on pings and ARP messages. But the behavior is OK with optimization set to -O2. This may or may not be a compiler optimization issue (it could also be a timing issue or a need for some additional volatile qualifiers). - I- and D-Caches are enabled but the D-Cache must be enabled in write-through mode. This is to work around issues with the RX and TX descriptors with are 8-bytes in size. But the D-Cache cache line size is 32-bytes. That means that you cannot reload, clean or invalidate a descriptor without also effecting three neighboring descriptors. Setting write through mode eliminates the need for cleaning the D-Cache. If only reloading and invalidating are done, then there is no problem. 7. The USBHS device controller driver (DCD) is complete but non-functional. At this point, work has stopped because I am stuck. The problem is that bus events are not occurring: Nothing is detected by the USBHS when the host is connected; no activity is seen on the bus by a USB analyzer when the host is connected. Possibilities: (1) the pullups on DM and DP are not working. This would prevent the host from detecting the presence of the device. the DETACH bit is, however, being correctly cleared or (2) some issue with clocking or configuration of the UTMI. I see nothing wrong this this case. I have done extensive comparison of the Atmel sample code and study of the data sheet, but I have not found the key to solving this. Serial Console ============== The SAMV71-XULT has no on-board RS-232 drivers so it will be necessary to use either the VCOM or an external RS-232 driver. Here are some options. - Arduino Serial Shield: One option is to use an Arduino-compatible serial shield. This will use the RXD and TXD signals available at pins 0 an 1, respectively, of the Arduino "Digital Low" connector. On the SAMV71-XULT board, this corresponds to UART3: ------ ------ ------- ------- -------- Pin on SAMV71 Arduino Arduino SAMV71 J503 PIO Name Pin Function ------ ------ ------- ------- -------- 1 PD28 RX0 0 URXD3 2 PD30 TX0 1 UTXD3 ------ ------ ------- ------- -------- In this configuration, an external RS232 driver can also be used instead of the shield. Simply connext as follows: --------- ----------- Arduino RS-232 Pin Label Connection --------- ----------- D0 (RXD) RX D1 (TXD) TX GND GND 5VO Vcc --------- ----------- - Arduino Communications. Additional UART/USART connections are available on the Arduino Communications connection J505: ------ ------ ------- ------- -------- Pin on SAMV71 Arduino Arduino SAMV71 J503 PIO Name Pin Function ------ ------ ------- ------- -------- 3 PD18 RX1 0 URXD4 4 PD19 TX1 0 UTXD4 5 PD15 RX2 0 RXD2 6 PD16 TX2 0 TXD2 7 PB0 RX3 0 RXD0 8 PB1 TX3 1 TXD0 ------ ------ ------- ------- -------- - SAMV7-XULT EXTn connectors. USART pins are also available the EXTn connectors. The following are labelled in the User Guide for USART functionality: ---- -------- ------ -------- EXT1 EXTI1 SAMV71 SAMV71 Pin Name PIO Function ---- -------- ------ -------- 13 USART_RX PB00 RXD0 14 USART_TX PB01 TXD0 ---- -------- ------ -------- EXT2 EXTI2 SAMV71 SAMV71 Pin Name PIO Function ---- -------- ------ -------- 13 USART_RX PA21 RXD1 14 USART_TX PB04 TXD1 - VCOM. The Virtual Com Port gateway is available on USART1: ------ -------- SAMV71 SAMV71 PIO Function ------ -------- PB04 TXD1 PA21 RXD1 ------ -------- Any of these options can be selected as the serial console by: 1. Enabling the UART/USART peripheral in the "System Type -> Peripheral Selection" menu, then 2. Configuring the peripheral in the "Drivers -> Serial Configuration" menu. SD Card ======= Card Slot --------- The SAM V71 Xplained Ultra has one standard SD card connector which is connected to the High Speed Multimedia Card Interface (HSMCI) of the SAM V71. SD card connector: ------ ----------------- --------------------- SAMV71 SAMV71 Shared functionality Pin Function ------ ----------------- --------------------- PA30 MCDA0 (DAT0) PA31 MCDA1 (DAT1) PA26 MCDA2 (DAT2) PA27 MCDA3 (DAT3) Camera PA25 MCCK (CLK) Shield PA28 MCCDA (CMD) PD18 Card Detect (C/D) Shield ------ ----------------- --------------------- Configuration Settings ---------------------- Enabling HSMCI support. The SAMV7-XULT provides a one, full-size SD memory card slots. The full size SD card slot connects via HSMCI0. Support for the SD slots can be enabled with the following settings: System Type->SAMV7 Peripheral Selection CONFIG_SAMV7_HSMCI0=y : To enable HSMCI0 support CONFIG_SAMV7_XDMAC=y : XDMAC is needed by HSMCI0/1 System Type CONFIG_SAMV7_PIO_IRQ=y : PIO interrupts needed CONFIG_SAMV7_PIOD_IRQ=y : Card detect pin is on PD18 Device Drivers -> MMC/SD Driver Support CONFIG_MMCSD=y : Enable MMC/SD support CONFIG_MMSCD_NSLOTS=1 : One slot per driver instance CONFIG_MMCSD_MULTIBLOCK_DISABLE=y : (REVISIT) CONFIG_MMCSD_HAVECARDDETECT=y : Supports card-detect PIOs CONFIG_MMCSD_MMCSUPPORT=n : Interferes with some SD cards CONFIG_MMCSD_SPI=n : No SPI-based MMC/SD support 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 RTOS Features -> Work Queue Support CONFIG_SCHED_WORKQUEUE=y : Driver needs work queue support Application Configuration -> NSH Library CONFIG_NSH_ARCHINIT=y : NSH board-initialization, OR CONFIG_BOARD_INITIALIZE=y Using the SD card ----------------- 1) After booting, the HSCMI device will appear as /dev/mmcsd0. 2) If you try mounting an SD card with nothing in the slot, the mount will fail: nsh> mount -t vfat /dev/mmcsd0 /mnt/sd0 nsh: mount: mount failed: 19 NSH can be configured to provide errors as strings instead of numbers. But in this case, only the error number is reported. The error numbers can be found in nuttx/include/errno.h: #define ENODEV 19 #define ENODEV_STR "No such device" So the mount command is saying that there is no device or, more correctly, that there is no card in the SD card slot. 3) Inserted the SD card. Then the mount should succeed. nsh> mount -t vfat /dev/mmcsd0 /mnt/sd0 nsh> ls /mnt/sd1 /mnt/sd1: atest.txt nsh> cat /mnt/sd1/atest.txt This is a test NOTE: See the next section entitled "Auto-Mounter" for another way to mount your SD card. 4) Before removing the card, you must umount the file system. This is equivalent to "ejecting" or "safely removing" the card on Windows: It flushes any cached data to an SD card and makes the SD card unavailable to the applications. nsh> umount -t /mnt/sd0 It is now safe to remove the card. NuttX provides into callbacks that can be used by an application to automatically unmount the volume when it is removed. But those callbacks are not used in these configurations. Auto-Mounter ============ NuttX implements an auto-mounter than can make working with SD cards easier. With the auto-mounter, the file system will be automatically mounted when the SD card is inserted into the HSMCI slot and automatically unmounted when the SD card is removed. Here is a sample configuration for the auto-mounter: File System Configuration CONFIG_FS_AUTOMOUNTER=y Board-Specific Options CONFIG_SAMV71XULT_HSMCI0_AUTOMOUNT=y CONFIG_SAMV71XULT_HSMCI0_AUTOMOUNT_FSTYPE="vfat" CONFIG_SAMV71XULT_HSMCI0_AUTOMOUNT_BLKDEV="/dev/mmcsd0" CONFIG_SAMV71XULT_HSMCI0_AUTOMOUNT_MOUNTPOINT="/mnt/sdcard" CONFIG_SAMV71XULT_HSMCI0_AUTOMOUNT_DDELAY=1000 CONFIG_SAMV71XULT_HSMCI0_AUTOMOUNT_UDELAY=2000 WARNING: SD cards should never be removed without first unmounting them. This is to avoid data and possible corruption of the file system. Certainly this is the case if you are writing to the SD card at the time of the removal. If you use the SD card for read-only access, however, then I cannot think of any reason why removing the card without mounting would be harmful. LEDs and Buttons ================ LEDs ---- There are two yellow LED available on the SAM V71 Xplained Ultra board that can be turned on and off. The LEDs can be activated by driving the connected I/O line to GND. ------ ----------- --------------------- SAMV71 Function Shared functionality PIO ------ ----------- --------------------- PA23 Yellow LED0 EDBG GPIO PC09 Yellow LED1 LCD, and Shield ------ ----------- --------------------- These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is defined. In that case, the usage by the board port is defined in include/board.h and src/sam_autoleds.c. The LEDs are used to encode OS-related events as follows: ------------------- ----------------------- -------- -------- SYMBOL Meaning LED state LED0 LED1 ------------------- ----------------------- -------- -------- LED_STARTED NuttX has been started OFF OFF LED_HEAPALLOCATE Heap has been allocated OFF OFF LED_IRQSENABLED Interrupts enabled OFF OFF LED_STACKCREATED Idle stack created ON OFF LED_INIRQ In an interrupt No change LED_SIGNAL In a signal handler No change LED_ASSERTION An assertion failed No change LED_PANIC The system has crashed N/C Blinking LED_IDLE MCU is is sleep mode Not used ------------------- ----------------------- -------- -------- Thus if LED0 is statically on, NuttX has successfully booted and is, apparently, running normally. If LED1 is flashing at approximately 2Hz, then a fatal error has been detected and the system has halted. NOTE: That LED0 is not used after completion of booting and may be used by other board-specific logic. Buttons ------- SAM V71 Xplained Ultra contains three mechanical buttons. One button is the RESET button connected to the SAM V71 reset line and the others are generic user configurable buttons. When a button is pressed it will drive the I/O line to GND. ------ ----------- --------------------- SAMV71 Function Shared functionality PIO ------ ----------- --------------------- RESET RESET Trace, Shield, and EDBG PA09 SW0 EDBG GPIO and Camera PB12 SW1 EDBG SWD and Chip Erase ------ ----------- --------------------- NOTES: - There are no pull-up resistors connected to the generic user buttons so it is necessary to enable the internal pull-up in the SAM V71 to use the button. - PB12 is set up as a system flash ERASE pin when the firmware boots. To use the SW1, PB12 has to be configured as a normal regular I/O pin in the MATRIX module. For more information see the SAM V71 datasheet. AT24MAC402 Serial EEPROM ======================== Ethernet MAC Address -------------------- The SAM V71 Xplained Ultra features one external AT24MAC402 serial EEPROM with a EIA-48 MAC address connected to the SAM V71 through I2C. This device contains a MAC address for use with the Ethernet interface. Connectivity: ------ -------- -------- ------------------------------------------ SAMV71 SAMV71 I2C Shared Pin Function Function Functionality ------ -------- -------- ------------------------------------------ PA03 TWID0 SDA EXT1, EXT2, EDBG I2C, LCD, Camera, Audio, MediaLB, and Shield PA04 TWICK0 SCL EXT1, EXT2, EDBG I2C, LCD, Camera, Audio, MediaLB, and Shield ------ -------- -------- ------------------------------------------ I2C address: The 7-bit addresses of the AT24 part are 0b1010AAA for the normal 2Kbit memory and 0b1011aaa for the "extended memory" where aaa is the state of the A0, A1, and A3 pins on the part. On the SAMV71-XULT board, these are all pulled high so the full, 7-bit address is 0x5f. Configuration ------------- System Type -> SAMV7 Peripheral Support CONFIG_SAMV7_TWIHS0=y : Used to access the EEPROM CONFIG_SAMV7_TWIHS0_FREQUENCY=100000 Device drivers -> Memory Technology Devices CONFIG_MTD_AT24XX=y : Enable the AT24 device driver CONFIG_AT24XX_SIZE=2 : Normal EEPROM is 2Kbit (256b) CONFIG_AT24XX_ADDR=0x57 : Normal EEPROM address */ CONFIG_AT24XX_EXTENDED=y : Supports an extended memory region CONFIG_AT24XX_EXTSIZE=160 : Extended address up to 0x9f MTD Configuration Data ---------------------- The AT24 EEPROM can also be used to storage of up to 256 bytes of configuration data: Device drivers -> Memory Technology Devices The configuration data device will appear at /dev/config. Networking ========== KSZ8061RNBVA Connections ------------------------ ------ --------- --------- -------------------------- SAMV71 SAMV71 Ethernet Shared functionality Pin Function Function ------ --------- --------- -------------------------- PD00 GTXCK REF_CLK Shield PD01 GTXEN TXEN PD02 GTX0 TXD0 PD03 GTX1 TXD1 PD04 GRXDV CRS_DV Trace PD05 GRX0 RXD0 Trace PD06 GRX1 RXD1 Trace PD07 GRXER RXER Trace PD08 GMDC MDC Trace PD09 GMDIO MDIO PA19 GPIO INTERRUPT EXT1, Shield PA29 GPIO SIGDET PC10 GPIO RESET ------ --------- --------- -------------------------- Selecting the GMAC peripheral ----------------------------- System Type -> SAMV7 Peripheral Support CONFIG_SAMV7_EMAC0=y : Enable the GMAC peripheral (aka, EMAC0) CONFIG_SAMV7_TWIHS0=y : We will get the MAC address from the AT24 EEPROM CONFIG_SAMV7_TWIHS0_FREQUENCY=100000 System Type -> EMAC device driver options CONFIG_SAMV7_EMAC0_NRXBUFFERS=16 : Set aside some RS and TX buffers CONFIG_SAMV7_EMAC0_NTXBUFFERS=8 CONFIG_SAMV7_EMAC0_RMII=y : The RMII interfaces is used on the board CONFIG_SAMV7_EMAC0_AUTONEG=y : Use autonegotiation CONFIG_SAMV7_EMAC0_PHYADDR=1 : KSZ8061 PHY is at address 1 CONFIG_SAMV7_EMAC0_PHYSR=30 : Address of PHY status register on KSZ8061 CONFIG_SAMV7_EMAC0_PHYSR_ALTCONFIG=y : Needed for KSZ8061 CONFIG_SAMV7_EMAC0_PHYSR_ALTMODE=0x7 : " " " " " " CONFIG_SAMV7_EMAC0_PHYSR_10HD=0x1 : " " " " " " CONFIG_SAMV7_EMAC0_PHYSR_100HD=0x2 : " " " " " " CONFIG_SAMV7_EMAC0_PHYSR_10FD=0x5 : " " " " " " CONFIG_SAMV7_EMAC0_PHYSR_100FD=0x6 : " " " " " " PHY selection. Later in the configuration steps, you will need to select the KSZ8061 PHY for EMAC (See below) Networking Support CONFIG_NET=y : Enable Neworking CONFIG_NET_NOINTS=y : Use the work queue, not interrupts for processing CONFIG_NET_SOCKOPTS=y : Enable socket operations CONFIG_NET_ETH_MTU=562 : Maximum packet size (MTU) 1518 is more standard CONFIG_NET_ETH_TCP_RECVWNDO=562 : Should be the same as CONFIG_NET_ETH_MTU CONFIG_NET_ARP=y : ARP support should be enabled CONFIG_NET_ARP_SEND=y : Use ARP to get peer address before sending CONFIG_NET_TCP=y : Enable TCP/IP networking CONFIG_NET_TCPBACKLOG=y : Support TCP/IP backlog CONFIG_NET_TCP_READAHEAD=y : Enable TCP read-ahead buffering CONFIG_NET_TCP_WRITE_BUFFERS=y : Enable TCP write buffering CONFIG_NET_UDP=y : Enable UDP networking CONFIG_NET_BROADCAST=y : Support UDP broadcase packets 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_KSZ8061=y : Select the KSZ8061 PHY used with EMAC0 Device drivers -> Memory Technology Devices CONFIG_MTD_AT24XX=y : Enable the AT24 device driver CONFIG_AT24XX_SIZE=2 : Normal EEPROM is 2Kbit (256b) CONFIG_AT24XX_ADDR=0x57 : Normal EEPROM address */ CONFIG_AT24XX_EXTENDED=y : Supports an extended memory region CONFIG_AT24XX_EXTSIZE=160 : Extended address up to 0x9f RTOS Features ->Work Queue Support CONFIG_SCHED_WORKQUEUE=y : Work queue support is needed CONFIG_SCHED_HPWORK=y CONFIG_SCHED_HPWORKSTACKSIZE=2048 : Might need to be increased Application Configuration -> Network Utilities CONFIG_NETUTILS_DNSCLIENT=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_NETLIB=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 an IP address CONFIG_NSH_DRIPADDR=0x0a000001 : IP address of gateway/host PC CONFIG_NSH_NETMASK=0xffffff00 : Netmask CONFIG_NSH_NOMAC=n : We will get the IP address from EEPROM : Defaults should be okay for other options Cache-Related Issues -------------------- I- and D-Caches can be enabled but the D-Cache must be enabled in write- through mode. This is to work around issues with the RX and TX descriptors with are 8-bytes in size. But the D-Cache cache line size is 32-bytes. That means that you cannot reload, clean or invalidate a descriptor without also effecting three neighboring descriptors. Setting write through mode eliminates the need for cleaning the D-Cache. If only reloading and invalidating are done, then there is no problem. 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 SAMA4D4-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 SAMA4D4-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-7.9 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. On the order of a minute! You will probably think that NuttX has crashed! And then, when it finally does come up, the network will not be available. Network Initialization Thread ----------------------------- There is a configuration option enabled by CONFIG_NSH_NETINIT_THREAD that will do the NSH network bring-up asynchronously in parallel on a separate thread. This eliminates the (visible) networking delay altogether. This networking initialization feature by itself has some limitations: - If no network is connected, the network bring-up will fail and the network initialization thread will simply exit. There are no retries and no mechanism to know if the network initialization was successful. - Furthermore, there is no support for detecting loss of the network connection and recovery of networking when the connection is restored. Both of these shortcomings can be eliminated by enabling the network monitor: Network Monitor --------------- By default the network initialization thread will bring-up the network then exit, freeing all of the resources that it required. This is a good behavior for systems with limited memory. If the CONFIG_NSH_NETINIT_MONITOR option is selected, however, then the network initialization thread will persist forever; it will monitor the network status. In the event that the network goes down (for example, if a cable is removed), then the thread will monitor the link status and attempt to bring the network back up. In this case the resources required for network initialization are never released. Pre-requisites: - CONFIG_NSH_NETINIT_THREAD as described above. - CONFIG_NETDEV_PHY_IOCTL. Enable PHY IOCTL commands in the Ethernet device driver. Special IOCTL commands must be provided by the Ethernet driver to support certain PHY operations that will be needed for link management. There operations are not complex and are implemented for the Atmel SAMV7 family. - CONFIG_ARCH_PHY_INTERRUPT. This is not a user selectable option. Rather, it is set when you select a board that supports PHY interrupts. In most architectures, the PHY interrupt is not associated with the Ethernet driver at all. Rather, the PHY interrupt is provided via some board-specific GPIO and the board-specific logic must provide support for that GPIO interrupt. To do this, the board logic must do two things: (1) It must provide the function arch_phy_irq() as described and prototyped in the nuttx/include/nuttx/arch.h, and (2) it must select CONFIG_ARCH_PHY_INTERRUPT in the board configuration file to advertise that it supports arch_phy_irq(). This logic can be found at nuttx/configs/sama5d4-ek/src/sam_ethernet.c. - And a few other things: UDP support is required (CONFIG_NET_UDP) and signals must not be disabled (CONFIG_DISABLE_SIGNALS). Given those prerequisites, the network monitor can be selected with these additional settings. Networking Support -> Networking Device Support CONFIG_NETDEV_PHY_IOCTL=y : Enable PHY ioctl support Application Configuration -> NSH Library -> Networking Configuration CONFIG_NSH_NETINIT_THREAD : Enable the network initialization thread CONFIG_NSH_NETINIT_MONITOR=y : Enable the network monitor CONFIG_NSH_NETINIT_RETRYMSEC=2000 : Configure the network monitor as you like CONFIG_NSH_NETINIT_SIGNO=18 Audio Interface =============== WM8904 Audio Codec ------------------ SAMV71 Interface WM8904 Interface ---- ------------ ------- ---------------------------------- PIO Usage Pin Function ---- ------------ ------- ---------------------------------- PA3 TWD0 SDA I2C control interface, data line PA4 TWCK0 SCLK I2C control interface, clock line PA10 RD ADCDAT Digital audio output (microphone) PB18 PCK2 MCLK Master clock PB0 TF LRCLK Left/right data alignment clock PB1 TK BCLK Bit clock, for synchronization PD11 GPIO IRQ Audio interrupt PD24 RF LRCLK Left/right data alignment clock PD26 TD DACDAT Digital audio input (headphone) ---- ------------ ------- ---------------------------------- CP2100-CP Fractional-N Clock Multiplier -------------------------------------- SAMV71 Interface CP2100-CP Interface ---- ------------ ------- ---------------------------------- PIO Usage Pin Function ---- ------------ ------- ---------------------------------- PA3 TWD0 SDA I2C control interface, data line PA4 TWCK0 SCLK I2C control interface, clock line PD21 TIOA11 CLK_IN PLL input - - XTI/XTO 12.0MHz crystal PA22 RK CLK_OUT PLL output - - AUX_OUT N/C ---- ------------ ------- ---------------------------------- maXTouch Xplained Pro ===================== Testing has also been performed using the maXTouch Xplained Pro LCD (ATMXT-XPRO). maXTouch Xplained Pro Standard Extension Header ----------------------------------------------- The LCD could be connected either via EXT1 or EXT2 using the 2x10 20-pin cable and the maXTouch Xplained Pro standard extension header. Access is then performed in SPI mode. NOTE the 3 switch mode selector on the back of the maXtouch. All switches should be in the ON position to select 4-wire SPI mode. ---- -------- ---- ----------- ---- ----------- ------------------------------------------ SAMV71-XULT maxTouch Xplained Pro PIN FUNCTION EXT1 FUNC EXT2 FUNC Description ---- -------- ---- ----------- ---- ----------- ------------------------------------------ 1 ID - - - - Communication line to ID chip 2 GND - - - - Ground 3 N/C PC31 - PD30 - 4 N/C PA19 - PC13 - 5 GPIO PB3 GPIO PA6 GPIO Command/Data Select 6 N/C PB2 - PD11 - 7 PWM PA0 PWMC0_PWMH0 PC19 PWMC0_PMWH2 Backlight control 8 N/C PC30 - PD26 - 9 GPIO/IRQ PD28 GPIO PA2 GPIO IRQ from maXTouch controller 10 GPIO PA5 GPIO PA24 GPIO RESET signal for maXTouch and LCD controller 11 I2C SDA PA3 TWID0 PA3 TWID0 I2C Data line for maXTouch controller 12 I2C SCL PA4 TWICK0 PA4 TWICK0 I2C Clock line for maXTouch controller 13 N/C PB0 - PA21 - 14 N/C PB1 - PB4 - 15 CS PD25 GPIO PD27 GPIO CS line for LCD controller 16 SPI MOSI PD21 SPI0_MOSI PD21 SPI0_MOSI SPI Data to LCD controller 17 SPI MISO PD20 SPI0_MISO PD20 SPI0_MISO SPI Data from LCD controller 18 SPI SCK PD22 SPI0_SPCK PD22 SPI0_SPCK SPI Clock line 19 GND - - - - Ground 20 VCC - - - - Target supply voltage ---- -------- ---- ----------- ---- ----------- ------------------------------------------ NOTE: Use of EXT1 conflicts with the Arduino RXD pin (PD28). You cannot put the maXTouch Xplained in EXT1 and also use the Arduino RXD/TXD pins as your serial console. maXTouch Xplained Pro Xplained Pro LCD Connector ------------------------------------------------ It is also possible to connect the LCD via the flat cable to the EXT4 LCD connector. In this case, you would use the SMC/EBI to communicate with the LCD. NOTE: (1) Only the RGB interface is supported by the SAMV71-XULT and (2) the 3 switch mode selector on the back of the maXtouch. These switches should be in the OFF-ON-OFF positions to select 16-bit color mode. ----------------- ------------- ----------------------------------------------------------- LCD SAMV71 Description Pin Function Pin Function ---- ------------ ---- -------- ----------------------------------------------------------- 1 ID - - Communication line to ID chip on extension board 2 GND - GND Ground 3 D0 PC0 D0 Data line 4 D1 PC1 D1 Data line 5 D2 PC2 D2 Data line 6 D3 PC3 D3 Data line 7 GND - GND Ground 8 D4 PC4 D4 Data line 9 D5 PC5 D5 Data line 10 D6 PC6 D6 Data line 11 D7 PC7 D7 Data line 12 GND - GND Ground 13 D8 PE0 D8 Data line 14 D9 PE1 D9 Data line 15 D10 PE2 D10 Data line 16 D11 PE3 D11 Data line 17 GND - GND Ground 18 D12 PE4 D12 Data line 19 D13 PE5 D13 Data line 20 D14 PA15 D14 Data line 21 D15 PA16 D15 Data line 22 GND - GND Ground 23 D16 - - Data line 24 D17 - - Data line 25 N/C - - 26 N/C - - 27 GND - GND Ground 28 N/C - - 29 N/C - - 30 N/C - - 31 N/C - - 32 GND - GND Ground 33 PCLK/ PC30 GPIO RGB: Pixel clock Display RAM select. CMD_DATA_SEL MCU: One address line of the MCU for displays where it is possible to select either the register or the data interface 34 VSYNC/CS PD19 NCS3 RGB: Vertical synchronization. MCU: Chip select 35 HSYNC/WE PC8 NWE RGB: Horizontal synchronization MCU: Write enable signal 36 DATA ENABLE/ PC11 NRD RGB: Data enable signal RE MCU: Read enable signal 37 SPI SCK - - MCU: Clock for SPI 38 SPI MOSI - - MCU: Master out slave in line of SPI 39 SPI MISO - - MCU: Master in slave out line of SPI 40 SPI SS - - MCU: Slave select for SPI 41 N/C - - 42 TWI SDA PA3 TWD0 I2C data line (maXTouch®) 43 TWI SCL PA4 TWCK0 I2C clock line (maXTouch) 44 IRQ1 PD28 WKUP5 maXTouch interrupt line 45 N/C PA2 WKUP2 46 PWM PC9 TIOB7 Backlight control 47 RESET PC13 GPIO Reset for both display and maxTouch 48 VCC - - 3.3V power supply for extension board 49 VCC - - 3.3V power supply for extension board 50 GND - - Ground ---- ------------ ---- -------- ----------------------------------------------------------- Connecting the flat cable. I was embarrassed to say that I did not know how the connectors worked. Let me share this so that, perhaps, I can save you the same embarrassment: - The maXTouch Xplained Pro has an Omron XF2M-5015-1A connector. There is a black bar at back (toward the baord). Raise that bar and insert the cable with the contacts away from the board. Lower that bar to lock the cable in place. - The SAMV71-Xult has a TE Connectivity 5-1734839-0 FPC connector that works differently. On each size of the connector are two small white tabs. Pull these out and away from the board. Insert the ribbon with the contacts toward the board. Lock the cable in place by pushing the tabs back in place. MXT Configuration Options ------------------------- System Type -> SAMV7 Peripheral Support CONFIG_SAMV7_TWIHS0=y : Needed by the MaXTouch controller CONFIG_SAMV7_TWIHS0_FREQUENCY=100000 Board Selection -> CONFIG_SAMV71XULT_MXTXPLND=y : MaXTouch Xplained is connected CONFIG_SAMV71XULT_MXTXPLND_EXT1=y : Connected on EXT1, or CONFIG_SAMV71XULT_MXTXPLND_EXT2=y : Connected on EXT2, or CONFIG_SAMV71XULT_MXTXPLND_LCD=y : Connected on LCD CONFIG_SAMV71XULT_MXT_DEVMINOR=0 : Register as /dev/input0 CONFIG_SAMV71XULT_MXT_I2CFREQUENCY=400000 NOTE: When selecting EXT1 or EXT2, be conscious of possible pin conflicts. EXT1, for example, will conflict with the use of the Arduino TXD and RXD pins for the serial console Device Drivers -> Input Devices CONFIG_INPUT=y : Enable support for human input devices CONFIG_INPUT_MXT=y : Enable support for the maXTouch controller The following enables a small built-in application that can be used to test the touchscreen: Application Configuration -> Examples -> Touchscreen example CONFIG_EXAMPLES_TOUCHSCREEN=y : Enables the example CONFIG_EXAMPLES_TOUCHSCREEN_ARCHINIT=y : Have board-specific intialization CONFIG_EXAMPLES_TOUCHSCREEN_DEVPATH="/dev/input0" CONFIG_EXAMPLES_TOUCHSCREEN_MINOR=0 ILI9488 Configuration Options ----------------------------- Currently only the RGB mode is supported. This means that the LCD can only be used in connected in the LCD (EXT4) connection. System Type -> SAMV7 Peripheral Support CONFIG_SAMV7_SMC=y : Needed by the ILI9466 driver controller CONFIG_SAMV7_XDMAC=y : Needed by the ILI9466 driver CONFIG_SAMV7_TWIHS0_FREQUENCY=100000 Board Selection -> CONFIG_SAMV71XULT_MXTXPLND=y : MaXTouch Xplained is connected CONFIG_SAMV71XULT_MXTXPLND_LCD=y : Must be connected on LCD NOTE: When selecting EXT1 or EXT2, be conscious of possible pin conflicts. EXT1, for example, will conflict with the use of the Arduino TXD and RXD pins for the serial console Device Drivers -> LCD drivers CONFIG_LCD=y : Enable support for LCDs Graphics CONFIG_NX=y : Enable Graphics supported CONFIG_NX_LCDDRIVER=y : Enable LCD driver support CONFIG_NX_DISABLE_*BPP=y : When * is {1,2,4,8,24, and 32} CONFIG_NXFONTS_CHARBITS=7 CONFIG_NXFONT_SANS23X27=y : One font must be enabled There are several graphics examples that can be enabled under apps/examples. nxlines is one of these and can be enabled as follows. See apps/examples/README.txt for information about configuring other graphics examples. The following enables a small built-in application that can be used to test the touchscreen: Application Configuration -> Examples -> NX lines example CONFIG_EXAMPLES_NXLINES=y : Enables the nxlines example CONFIG_EXAMPLES_NXLINES_VPLANE=0 CONFIG_EXAMPLES_NXLINES_DEVNO=0 Debugging ========= The on-board EDBG appears to work only with Atmel Studio. You can however, simply connect a SAM-ICE or J-Link to the JTAG/SWD connector on the board and that works great. The only tricky thing is getting the correct orientation of the JTAG connection. I have been using Atmel Studio to write code to flash then I use the Segger J-Link GDB server to debug. I have been using the 'Device Programming' I available under the Atmel Studio 'Tool' menu. I have to disconnect the SAM-ICE while programming with the EDBG. I am sure that you could come up with a GDB server-only solution if you wanted. I run GDB like this from the directory containing the NuttX ELF file: arm-none-eabi-gdb (gdb) target remote localhost:2331 (gdb) mon reset (gdb) file nuttx (gdb) ... start debugging ... Configurations ============== Information Common to All Configurations ---------------------------------------- Each SAMV71-XULT configuration is maintained in a sub-directory and can be selected as follow: cd tools ./configure.sh samv71-xult/ cd - . ./setenv.sh Before sourcing the setenv.sh file above, you should examine it and perform edits as necessary so that TOOLCHAIN_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 oldconfig 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 UART3 (i.e., for the Arduino serial shield). 3. All of these configurations are set up to build under Windows using the "GNU Tools for ARM Embedded Processors" that is maintained by ARM (unless stated otherwise in the description of the configuration). https://launchpad.net/gcc-arm-embedded As of this writing (2015-03-11), full support is difficult to find for the Cortex-M&, but is supported by at least this realeasse of the ARM GNU tools: https://launchpadlibrarian.net/192228215/release.txt That toolchain selection can easily be reconfigured using 'make menuconfig'. Here are the relevant current settings: Build Setup: CONFIG_HOST_WINDOWS=y : Window environment CONFIG_WINDOWS_CYGWIN=y : Cywin under Windows System Type -> Toolchain: CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIW=y : GNU ARM EABI toolchain NOTE: As of this writing, there are issues with using this tool at the -Os level of optimization. This has not been proven to be a compiler issue (as least not one that might not be fixed with a well placed volatile qualifier). However, in any event, it is recommend that you use not more that -O2 optimization. Configuration sub-directories ----------------------------- mxtxplnd: Configures the NuttShell (nsh) located at examples/nsh. There are three very similar NSH configurations: - nsh. This configuration is focused on low level, command-line driver testing. It has no network. - netnsh. This configuration is focused on network testing and has only limited command support. - mxtxplnd. This configuration is identical to the nsh configuration but assumes that you have a maXTouch Xplained Pro LCD attached and includes extra tests for the touchscreen and LCD. NOTES: 1. See the notes associated with the nsh configuration below. Only differences from that configuration will be addressed here. 2. Basic touchscreen/LCD configuration settings are discussed above in the paragraph entitled, "maXTouch Xplained Pro". 3. Unlike the nsh configuration, this configuration has the serial console setup to USART0 which is available on EXT1: ----------- --- ------- ----- Connector PIO Arduino SAMV7 ----------- --- ------- ----- EXT1 pin 13 PB0 RX3 RXD0 EXT1 pin 14 PB1 TX3 TXD0 ----------- --- ------- ----- and also on the Arduino Communications connector (J505): ----------- --- ------- ----- Connector PIO Arduino SAMV7 ----------- --- ------- ----- J505 pin 7 PB0 RX3 RXD0 J505 pin 8 PB1 TX3 TXD0 ----------- --- ------- ----- Use of either the EXT1 or the LCD/EXT4 connectors conflict with the Arduino RXD pin (UART3, PD28). You cannot put the maXTouch Xplained in EXT1 or LCD/EXT4 and also use the Arduino RXD/TXD pins as your serial console. The LCD (EXT4) is configured by default because only the RGB LCD interface is currently supported and that is only available on that connector. If you plan to use EXT2 for some reason, you may re-configure the serial console to use UART3, the standard Arduino RXD/TXD. You would also, of course, have to disable the LCD. NOTE that the USART0 pins PB0 and PB1 conflict with SSC TF and TK pins as connected to the WM8904 audio CODEC. So, unless yet a different U[S]ART option is selected, Audio cannot be used with this configuration. 4. Support for the ILI8488 LCD is enabled. Only the RGB mode is support at present. As a consequence, the maXTouch Xplained Pro must be connected at the LCD (EXT4) connector. This mode requires: CONFIG_SAMV71XULT_MXTXPLND_LCD=y : Must be connect in LCD (EXT4) CONFIG_SAMV7_SMC=y : SMC/EBI support CONFIG_SAMV7_XDMAC=y : XDMAC support 5. The appx/examples/nxlines is enalbed as a built-in application. 6. When the maXTouch Xplained is connected (in any position), a new I2C address appears at address 0x4a: nsh> i2c dev 3 77 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- 1a -- -- -- -- -- 20: -- -- -- -- -- -- -- -- 28 -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- 37 -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- 4a -- -- -- 4e -- 50: -- -- -- -- -- -- -- 57 -- -- -- -- -- -- -- 5f 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- This is the I2C address of the maXTouch touchscreen controller. (0x1a is the address of the WM8904 Audio CODEC, 0x28 is the address of TWI interface to the EDBG, 0x4e is the address of the CP2100CP programmable PLL, and 0x57 and 0x5f are the addresses of the AT2 EEPROM. I am not sure what the other address, 0x37, is). STATUS: 2015-03-30: Currently contains on a touchscreen test. The touchscreen does not yet work. netnsh: Configures the NuttShell (nsh) located at examples/nsh. There are three very similar NSH configurations: - nsh. This configuration is focused on low level, command-line driver testing. It has no network. - netnsh. This configuration is focused on network testing and has only limited command support. - mxtxplnd. This configuration is identical to the nsh configuration but assumes that you have a maXTouch Xplained Pro LCD attached and includes extra tests for the touchscreen and LCD. NOTES: 1. The serial console is configured by default for use with and Arduino serial shield (UART3). You will need to reconfigure if you will to use a different U[S]ART. 2. Default stack sizes are large and should really be tuned to reduce the RAM footprint: CONFIG_SCHED_HPWORKSTACKSIZE=2048 CONFIG_IDLETHREAD_STACKSIZE=1024 CONFIG_USERMAIN_STACKSIZE=2048 CONFIG_PTHREAD_STACK_MIN=256 CONFIG_PTHREAD_STACK_DEFAULT=2048 CONFIG_POSIX_SPAWN_PROXY_STACKSIZE=1024 CONFIG_TASK_SPAWN_DEFAULT_STACKSIZE=2048 CONFIG_BUILTIN_PROXY_STACKSIZE=1024 CONFIG_NSH_TELNETD_DAEMONSTACKSIZE=2048 CONFIG_NSH_TELNETD_CLIENTSTACKSIZE=2048 3. NSH built-in applications are supported. There are, however, not enabled built-in applications. Binary Formats: CONFIG_BUILTIN=y : Enable support for built-in programs Application Configuration: CONFIG_NSH_BUILTIN_APPS=y : Enable starting apps from NSH command line 4. The network initialization thread is NOT enabled in this configuration. As a result, networking initialization is performed serially with NSH bring-up. The time from reset to the NSH prompt will be determined primarily by this network initialization time. And can be especially long, perhaps minutes, if the network cable is not connected! If fast boot times are required, you need to perform asynchronous network initialization as described under "Network Initialization Thread" 5. SDRAM is NOT enabled in this configuration. 6. TWI/I2C TWIHS0 is enabled in this configuration. The SAM V71 Xplained Ultra supports two devices on the one on-board I2C device on the TWIHS0 bus: (1) The AT24MAC402 serial EEPROM described above and (2) the Wolfson WM8904 audio CODEC. This device contains a MAC address for use with the Ethernet interface. Relevant configuration settings: CONFIG_SAMV7_TWIHS0=y CONFIG_SAMV7_TWIHS0_FREQUENCY=100000 CONFIG_I2C=y CONFIG_I2C_TRANSFER=y 7. TWIHS0 is used to support 256 byte non-volatile storage. This EEPROM holds the assigned MAC address which is necessary for networking. The EEPROM is also available for storage of configuration data using the MTD configuration as described above under the heading, "MTD Configuration Data". 8. Support for HSMCI is built-in by default. The SAMV71-XULT provides one full-size SD memory card slot. Refer to the section entitled "SD card" for configuration-related information. See "Open Issues" above for issues related to HSMCI. The auto-mounter is not enabled. See the section above entitled "Auto-Mounter". 9. Performance-related Configuration settings: CONFIG_ARMV7M_ICACHE=y : Instruction cache is enabled CONFIG_ARMV7M_DCACHE=y : Data cache is enabled CONFIG_ARMV7M_DCACHE_WRITETHROUGH=y : Write through mode CONFIG_ARCH_FPU=y : H/W floating point support is enabled CONFIG_ARCH_DPFPU=y : 64-bit H/W floating point support is enabled # CONFIG_ARMV7M_ITCM is not set : Support not yet in place # CONFIG_ARMV7M_DTCM is not set : Support not yet in place I- and D-Caches are enabled but the D-Cache must be enabled in write- through mode. This is to work around issues with the RX and TX descriptors with are 8-bytes in size. But the D-Cache cache line size is 32-bytes. That means that you cannot reload, clean or invalidate a descriptor without also effecting three neighboring descriptors. Setting write through mode eliminates the need for cleaning the D-Cache. If only reloading and invalidating are done, then there is no problem. Stack sizes are also large to simplify the bring-up and should be tuned for better memory usages. STATUS: 2015-03-29: I- and D-caches are currently enabled, but as noted above, the D-Cache must be enabled in write-through mode. Also -Os optimization is not being used (-O2). If the cache is enabled in Write-Back mode or if higher levels of optimization are enabled, then there are failures when trying to ping the target from a host. nsh: Configures the NuttShell (nsh) located at examples/nsh. There are three very similar NSH configurations: - nsh. This configuration is focused on low level, command-line driver testing. It has no network. - netnsh. This configuration is focused on network testing and has only limited command support. - mxtxplnd. This configuration is identical to the nsh configuration but assumes that you have a maXTouch Xplained Pro LCD attached and includes extra tests for the touchscreen and LCD. NOTES: 1. The serial console is configured by default for use with and Arduino serial shield (UART3). You will need to reconfigure if you will to use a different U[S]ART. 2. Default stack sizes are large and should really be tuned to reduce the RAM footprint: CONFIG_ARCH_INTERRUPTSTACK=2048 CONFIG_IDLETHREAD_STACKSIZE=1024 CONFIG_USERMAIN_STACKSIZE=2048 CONFIG_PTHREAD_STACK_DEFAULT=2048 ... and others ... 3. NSH built-in applications are supported. Binary Formats: CONFIG_BUILTIN=y : Enable support for built-in programs Application Configuration: CONFIG_NSH_BUILTIN_APPS=y : Enable starting apps from NSH command line 4. SDRAM is not enabled in this configuration. I have enabled SDRAM and the apps/examples RAM test using this configuration settings: System Type CONFIG_SAMV7_SDRAMC=y CONFIG_SAMV7_SDRAMSIZE=2097152 Application Configuration: CONFIG_SYSTEM_RAMTEST=y The RAM test can be executed as follows: nsh> ramtest -w 70000000 209152 STATUS: As of this writing, SDRAM does not pass the RAM test. This is the sympton: nsh> mw 70000000 70000000 = 0x00000000 nsh> mw 70000000=55555555 70000000 = 0x00000000 -> 0x55555555 nsh> mw 70000000 70000000 = 0x55555555 nsh> mw 70100000 70100000 = 0x00000000 nsh> mw 70100000=aaaaaaaa 70100000 = 0x00000000 -> 0xaaaaaaaa nsh> mw 70100000 70100000 = 0xaaaaaaaa nsh> mw 70000000 70000000 = 0x00000000 <<< Lost RAM content 5. The button test at apps/examples/buttons is included in the configuration. This configuration illustrates (1) use of the buttons on the evaluation board, and (2) the use of PIO interrupts. Example usage: NuttShell (NSH) NuttX-7.8 nsh> help help usage: help [-v] [] ... Builtin Apps: buttons nsh> buttons 3 maxbuttons: 3 Attached handler at 4078f7 to button 0 [SW0], oldhandler:0 Attached handler at 4078e9 to button 1 [SW1], oldhandler:0 IRQ:125 Button 1:SW1 SET:00: SW1 released IRQ:125 Button 1:SW1 SET:02: SW1 depressed IRQ:125 Button 1:SW1 SET:00: SW1 released IRQ:90 Button 0:SW0 SET:01: SW0 depressed IRQ:90 Button 0:SW0 SET:00: SW0 released IRQ:125 Button 1:SW1 SET:02: SW1 depressed nsh> 6. TWI/I2C TWIHS0 is enabled in this configuration. The SAM V71 Xplained Ultra supports two devices on the one on-board I2C device on the TWIHS0 bus: (1) The AT24MAC402 serial EEPROM described above and (2) the Wolfson WM8904 audio CODEC. This device contains a MAC address for use with the Ethernet interface. In this configuration, the I2C tool at apps/system/i2ctool is enabled. This tools supports interactive access to I2C devices on the enabled TWIHS bus. Relevant configuration settings: CONFIG_SAMV7_TWIHS0=y CONFIG_SAMV7_TWIHS0_FREQUENCY=100000 CONFIG_I2C=y CONFIG_I2C_TRANSFER=y CONFIG_SYSTEM_I2CTOOL=y CONFIG_I2CTOOL_MINBUS=0 CONFIG_I2CTOOL_MAXBUS=0 CONFIG_I2CTOOL_MINADDR=0x03 CONFIG_I2CTOOL_MAXADDR=0x77 CONFIG_I2CTOOL_MAXREGADDR=0xff CONFIG_I2CTOOL_DEFFREQ=400000 Example usage: nsh> i2c Usage: i2c [arguments] Where is one of: Show help : ? List busses : bus List devices : dev [OPTIONS] Read register : get [OPTIONS] [] Show help : help Write register: set [OPTIONS] [] Verify access : verf [OPTIONS] [] [] Where common "sticky" OPTIONS include: [-a addr] is the I2C device address (hex). Default: 03 Current: 03 [-b bus] is the I2C bus number (decimal). Default: 0 Current: 0 [-r regaddr] is the I2C device register address (hex). Default: 00 Current: 00 [-w width] is the data width (8 or 16 decimal). Default: 8 Current: 8 [-s|n], send/don't send start between command and data. Default: -n Current: -n [-i|j], Auto increment|don't increment regaddr on repititions. Default: NO Current: NO [-f freq] I2C frequency. Default: 400000 Current: 400000 NOTES: o An environment variable like $PATH may be used for any argument. o Arguments are "sticky". For example, once the I2C address is specified, that address will be re-used until it is changed. WARNING: o The I2C dev command may have bad side effects on your I2C devices. Use only at your own risk. nsh> i2c bus BUS EXISTS? Bus 0: YES nsh> i2c dev 3 77 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- 1a -- -- -- -- -- 20: -- -- -- -- -- -- -- -- 28 -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- 37 -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- 4e -- 50: -- -- -- -- -- -- -- 57 -- -- -- -- -- -- -- 5f 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- nsh> Where 0x1a is the address of the WM8904 Audio CODEC, 0x28 is the address of TWI interface to the EDBG, 0x4e is the address of the CP2100CP programmable PLL, and 0x57 and 0x5f are the addresses of the AT2 EEPROM (I am not sure what the other address, 0x37, is as this writing). 7. TWIHS0 is also used to support 256 byte non-volatile storage for configuration data using the MTD configuration as described above under the heading, "MTD Configuration Data". 8. Support for HSMCI is built-in by default. The SAMV71-XULT provides one full-size SD memory card slot. Refer to the section entitled "SD card" for configuration-related information. See "Open Issues" above for issues related to HSMCI. The auto-mounter is not enabled. See the section above entitled "Auto-Mounter". 9. Performance-related Configuration settings: CONFIG_ARMV7M_ICACHE=y : Instruction cache is enabled CONFIG_ARMV7M_DCACHE=y : Data cache is enabled CONFIG_ARMV7M_DCACHE_WRITETHROUGH=n : Write back mode CONFIG_ARCH_FPU=y : H/W floating point support is enabled CONFIG_ARCH_DPFPU=y : 64-bit H/W floating point support is enabled # CONFIG_ARMV7M_ITCM is not set : Support not yet in place # CONFIG_ARMV7M_DTCM is not set : Support not yet in place Stack sizes are also large to simplify the bring-up and should be tuned for better memory usages. STATUS: 2015-03-28: HSMCI TX DMA is disabled. There are some issues with the TX DMA that need to be corrected.