379 lines
14 KiB
Plaintext
379 lines
14 KiB
Plaintext
README.txt
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==========
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This README file discusses the port of NuttX to the PiKRON LX_CPU board:
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See http://pikron.com/pages/products/cpu_boards/lx_cpu.html. This board features the
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NXP LPC4088 MCU
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CONTENTS
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========
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o LEDs
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o Serial Console
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o ETHERNET
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o Using OpenOCD with the Olimex ARM-USB-OCD
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o Loading Code with the ISP Board
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o Configuration
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LEDs
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====
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The LX_CPU base board has two user LEDs
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LED1 : Connected to P1[29] RED
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LED2 : Connected to P0[16] GREEN
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If CONFIG_ARCH_LEDS is not defined, then the user can control the LEDs in
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any way using the defitions provided in the board.h header file.
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If CONFIG_ARCH_LEDs is defined, then NuttX will control the 2 LEDs on the
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WaveShare Open1788K. The following definitions describe how NuttX controls
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the LEDs:
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LED1 LED2
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LED_STARTED OFF OFF
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LED_HEAPALLOCATE ON OFF
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LED_IRQSENABLED OFF ON
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LED_STACKCREATED ON ON
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LED_INIRQ
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LED_SIGNAL
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LED_ASSERTION
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LED_PANIC
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LED_IDLE
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Serial Console
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==============
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By Default, UART0 is used as the serial console in all configurations. This
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may be connected to your computer via an external RS-232 driver or via the
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WaveShare USB ISP/VCOM module.
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As an option, UART1 can also be used for the serial console. You might want,
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to do this, for example, if you use UART0 for the ISP function and you want
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to use a different UART for console output. UART1 can be configured as the
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serial console by changing the configuration as follows:
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System Type:
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CONFIG_LPC17_UART0=n : Disable UART0 if it is no longer used
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CONFIG_LPC17_UART1=y : Enable UART1
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Drivers:
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CONFIG_UART1_SERIAL_CONSOLE=y : Setup up the UART1 configuration
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CONFIG_UART1_RXBUFSIZE=256
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CONFIG_UART1_TXBUFSIZE=256
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CONFIG_UART1_BAUD=115200
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CONFIG_UART1_BITS=8
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CONFIG_UART1_PARITY=0
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CONFIG_UART1_2STOP=0
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In this configuration using UART1, it is necessary to disable LED support
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on the board. That is because UART1 RXD is set for pin p0.16, but so is
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LED2. If you do not disable LED support then no incoming serial data will
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be recevied.
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Common Board Options
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CONFIG_ARCH_LEDS=n : Disable LED support
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You should also remove the LED2 jumper so that the RXD input does not
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attempt to drive LED2 as well (However, this does not seem to interfere with
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data receipt).
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NOTE: If you intend to use LEDs with UART1, then you might want to
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redesign some ofthe LED logic in the src/ subdirectory so that it does not
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attempt to use LED2.
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ETHERNET
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========
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On chip ethernet MAC with external 10/100M PHY DP83848I.
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The LX_CPU board is populated with integrated connector
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module (ICM) socket suitable for direct connection to
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the standard ETHERNET infrastructure.
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Config
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CONFIG_LPC17_ETHERNET=y
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CONFIG_LPC17_PHY_AUTONEG=y
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CONFIG_ETH0_PHY_DP83848C=y
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Using OpenOCD with the Olimex ARM-USB-OCD
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=========================================
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Building OpenOCD under Cygwin:
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Refer to configs/olimex-lpc1766stk/README.txt
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Installing OpenOCD in Ubuntu Linux:
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sudo apt-get install openocd
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Helper Scripts.
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I have been using the Olimex ARM-USB-OCD debugger. OpenOCD
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requires a configuration file. I keep the one I used last here:
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boards/arm/lpc17xx_40xx/lx_cpu/tools/lx_cpu.cfg
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However, the "correct" configuration script to use with OpenOCD may
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change as the features of OpenOCD evolve. So you should at least
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compare that lx_cpu.cfg file with configuration files in
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/usr/share/openocd/scripts. As of this writing, the configuration
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files of interest were:
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/usr/local/share/openocd/scripts/interface/openocd-usb.cfg
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This is the configuration file for the Olimex ARM-USB-OCD
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debugger. Select a different file if you are using some
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other debugger supported by OpenOCD.
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/usr/local/share/openocd/scripts/board/?
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I don't see a board configuration file for the WaveShare
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LX_CPU board.
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/usr/local/share/openocd/scripts/target/lpc1788.cfg
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This is the configuration file for the LPC1788 target.
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It just sets up a few parameters then sources lpc17xx.cfg
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/usr/local/share/openocd/scripts/target/lpc17xx.cfg
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This is the generic LPC configuration for the LPC17xx
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family. It is included by lpc1788.cfg.
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NOTE: These files could also be located under /usr/share in some
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installations. They could be most anywhwere if you are using a
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windows version of OpenOCD.
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boards/arm/lpc17xx_40xx/lx_cpu/tools/lx_cpu.cfg
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This is simply openocd-usb.cfg, lpc1788.cfg, and lpc17xx.cfg
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concatenated into one file for convenience. Don't use it
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unless you have to.
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There is also a script on the tools/ directory that I use to start
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the OpenOCD daemon on my system called oocd.sh. That script will
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probably require some modifications to work in another environment:
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- Possibly the value of OPENOCD_PATH and TARGET_PATH
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- It assumes that the correct script to use is the one at
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boards/arm/lpc17xx_40xx/lx_cpu/tools/lx_cpu.cfg
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Starting OpenOCD
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Then you should be able to start the OpenOCD daemon as follows. This
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assumes that you have already CD'ed to the NuttX build directory:
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. ./setenv.sh
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oocd.sh $PWD
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The setenv.sh script is a convenience script that you may choose to
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use or not. It simply sets up the PATH variable so that you can
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automatically find oocd.sh. You could also do:
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boards/arm/lpc17xx_40xx/lx_cpu/tools/oocd.sh $PWD
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Connecting GDB
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Once the OpenOCD daemon has been started, you can connect to it via
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GDB using the following GDB command:
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arm-nuttx-elf-gdb
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(gdb) target remote localhost:3333
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NOTE: The name of your GDB program may differ. For example, with the
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CodeSourcery toolchain, the ARM GDB would be called arm-none-eabi-gdb.
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OpenOCD will support several special 'monitor' sub-commands. You can
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use the 'monitor' (or simply 'mon') command to invoke these sub-
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commands. These GDB commands will send comments to the OpenOCD monitor.
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Here are a couple that you will need to use:
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(gdb) monitor reset
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(gdb) monitor halt
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NOTES:
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1. The MCU must be halted using 'monitor halt' prior to loading code.
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2. 'monitor reset' will restart the processor after loading code.
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3. The 'monitor' command can be abbreviated as just 'mon'.
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After starting GDB, you can load the NuttX ELF file like this:
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(gdb) mon halt
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(gdb) load nuttx
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NOTES:
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1. NuttX should have been built so that it has debugging symbols
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(by setting CONFIG_DEBUG_SYMBOLS=y in the .config file).
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2. The MCU must be halted prior to loading code.
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3. I find that there are often undetected write failures when using
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the Olimex ARM-USB-OCD debugber and that if you start the program
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with a bad FLASH failure, it will lock up OpenOCD. I usually
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oad nuttx twice, restarting OpenOCD in between in order to assure
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good FLASH contents:
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(gdb) mon halt
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(gdb) load nuttx
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(gdb) mon reset
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Exit GDB, kill the OpenOCD server, recycle power on the board,
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restart the OpenOCD server and GDB, then:
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(gdb) mon halt
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(gdb) load nuttx
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(gdb) mon reset
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Other debuggers may not have these issues and such drastic steps may
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not be necessary.
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Loading Code with the ISP Board
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===============================
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Use can also load code onto the board using the WaveShare and the UART0
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ISP/VCOM board. I use the FlashMagic program for Windows available here:
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http://www.flashmagictool.com/ . It is so easy to use that no further
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explanation should be necessary: Just select the LPC1788, the ISP COM
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port, and the NuttX .hex file and program it.
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CONFIGURATION
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=============
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nsh
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---
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Configures the NuttShell (nsh) located at examples/nsh. The
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Configuration enables only the serial NSH interface.
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NOTES:
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1. This configuration uses the mconf-based configuration tool. To
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change this configuration using that tool, you should:
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a. Build and install the kconfig-mconf tool. See nuttx/README.txt
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see additional README.txt files in the NuttX tools repository./README.txt.
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b. Execute 'make menuconfig' in nuttx/ in order to start the
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reconfiguration process.
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2. Uses the older, OABI, buildroot toolchain. But that is easily
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reconfigured:
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CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT=y : Buildroot toolchain
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CONFIG_ARMV7M_OABI_TOOLCHAIN=y : Older, OABI toolchain
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3. This NSH has support for built-in applications enabled, however,
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no built-in configurations are built in the defulat configuration.
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4. This configuration has DMA-based SD card support enabled by
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default. That support can be disabled as follow:
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CONFIG_LPC17_GPDMA=n : No DMA
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CONFIG_ARCH_DMA=n
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CONFIG_LPC17_SDCARD=n : No SD card driver
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CONFIG_SDIO_DMA=n : No SD card DMA
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CONFIG_MMCSD=n : No MMC/SD driver support
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CONFIG_FS_FAT=n : No FAT file system support
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5. This configuration has been used for verifying SDRAM by modifying
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the configuration in the following ways:
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CONFIG_LPC17_EMC=y : Enable the EMC
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CONFIG_LPC17_EXTDRAM=y : Configure external DRAM
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CONFIG_LPC17_EXTDRAMSIZE=67108864 : DRAM size 2x256/8 = 64MB
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CONFIG_SYSTEM_RAMTEST=y : Enable the RAM test built-in
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In this configuration, the SDRAM is not added to heap and so is
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not excessible to the applications. So the RAM test can be
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freely executed against the SRAM memory beginning at address
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0xa000:0000 (CS0).
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6. This configuration has been used for verifying the touchscreen on
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on the 4.3" LCD module.
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a) As of this writing, this touchscreen is still not functional.
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Rommel Marcelo has tracked this problem down to noise on the
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PENIRQ interrupt. There are so many false interrupts that
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the NuttX interrupt-driven touchscreen driver cannot be used.
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Other compatible LCDs, however, may not have this issue.
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b) You can enable the touchscreen by modifying the configuration
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in the following ways:
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Drivers:
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CONFIG_INPUT=y : Enable support for input devices
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CONFIG_INPUT_ADS7843E=y : Enable support for the XPT2048
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CONFIG_ADS7843E_SPIDEV=1 : Use SSP1 for communication
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CONFIG_SPI=y : Enable SPI support
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CONFIG_SPI_EXCHANGE=n : exchange() method is not supported
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System Type:
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CONFIG_GPIO_IRQ=y : GPIO interrupt support
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CONFIG_LPC17_SSP1=y : Enable support for SSP1
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RTOS Features:
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CONFIG_DISABLE_SIGNALS=n : Signals are required
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Library Support:
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CONFIG_SCHED_WORKQUEUE=y : Work queue support required
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Applicaton Configuration:
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CONFIG_EXAMPLES_TOUCHSCREEN=y : Enable the touchscreen built-int test
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Defaults should be okay for related touchscreen settings. Touchscreen
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debug output can be enabled with:
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Build Setup:
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CONFIG_DEBUG=y : Enable debug features
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CONFIG_DEBUG_VERBOSE=y : Enable verbose debug output
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CONFIG_DEBUG_INPUT=y : Enable debug output from input devices
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c) You will also have to disable SD card support to use this test. The
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SD card detect (CD) signal is on P0[13]. This signal is shared. It
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is also used for MOSI1 and USB_UP_LED. The CD pin may be disconnected.
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There is a jumper on board that enables the CD pin. OR, you can simply
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remove the SD module so that it does not drive the CD pin.
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Drivers:
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CONFIG_MMCSD=n : No MMC/SD driver support
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System Type:
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CONFIG_LPC17_GPDMA=n : No DMA
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CONFIG_LPC17_SDCARD=n : No SD card driver
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CONFIG_SDIO_DMA=n : No SD card DMA
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CONFIG_ARCH_DMA=n
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File Systems:
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CONFIG_FS_FAT=n : No FAT file system support
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For touchscreen debug output:
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Build Setup:
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CONFIG_DEBUG=y
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CONFIG_DEBUG_VERBOSE=y
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CONFIG_DEBUG_INPUT=y
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7. The button test (apps/examples/buttons) can be built-in by adding
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the following options. See apps/examples/README.txt for further
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information about the button test.
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System Type:
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CONFIG_GPIO_IRQ=y
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Board Selection:
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CONFIG_ARCH_BUTTONS=y
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CONFIG_ARCH_IRQBUTTONS=y
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Application Configuration:
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CONFIG_EXAMPLES_BUTTONS=y
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CONFIG_EXAMPLES_BUTTONS_MIN=0
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CONFIG_EXAMPLES_BUTTONS_MAX=7
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CONFIG_EXAMPLES_IRQBUTTONS_MIN=1
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CONFIG_EXAMPLES_IRQBUTTONS_MAX=7
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CONFIG_EXAMPLES_BUTTONS_NAME0="USER1"
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CONFIG_EXAMPLES_BUTTONS_NAME1="USER2"
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CONFIG_EXAMPLES_BUTTONS_NAME2="USER3"
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CONFIG_EXAMPLES_BUTTONS_NAME3="JOYSTICK_A"
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CONFIG_EXAMPLES_BUTTONS_NAME4="JOYSTICK_B"
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CONFIG_EXAMPLES_BUTTONS_NAME5="JOYSTICK_C"
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CONFIG_EXAMPLES_BUTTONS_NAME6="JOYSTICK_D"
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CONFIG_EXAMPLES_BUTTONS_NAME7="JOYSTICK_CTR"
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