px4-firmware

dark0707

History

patacongo c9230359ef All ZNEO configurations converted to use the mconf/Kconfig tool git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5401 42af7a65-404d-4744-a932-0658087f49c3		2012-11-29 18:44:02 +00:00
..
dhcpd	Big refactoring of toolchain definitions by Mike Smith	2012-11-21 18:34:10 +00:00
discover	All ZNEO configurations converted to use the mconf/Kconfig tool	2012-11-29 18:44:02 +00:00
include	Resync new repository with old repo r5166	2012-09-17 18:18:44 +00:00
nettest	Big refactoring of toolchain definitions by Mike Smith	2012-11-21 18:34:10 +00:00
nsh	Big refactoring of toolchain definitions by Mike Smith	2012-11-21 18:34:10 +00:00
nsh2	Big refactoring of toolchain definitions by Mike Smith	2012-11-21 18:34:10 +00:00
nxconsole	Big refactoring of toolchain definitions by Mike Smith	2012-11-21 18:34:10 +00:00
nxwm	Big refactoring of toolchain definitions by Mike Smith	2012-11-21 18:34:10 +00:00
ostest	Big refactoring of toolchain definitions by Mike Smith	2012-11-21 18:34:10 +00:00
scripts	Massive clean-up of linker scripts from Freddie Chopin	2012-11-04 17:18:25 +00:00
src	Missing comma in EVERY DELFILE/DELDIR macro call in every Makefile	2012-11-20 15:47:41 +00:00
telnetd	Big refactoring of toolchain definitions by Mike Smith	2012-11-21 18:34:10 +00:00
webserver	Big refactoring of toolchain definitions by Mike Smith	2012-11-21 18:34:10 +00:00
xmlrpc	All ZNEO configurations converted to use the mconf/Kconfig tool	2012-11-29 18:44:02 +00:00
Kconfig	Resync new repository with old repo r5166	2012-09-17 18:18:44 +00:00
README.txt	Mostly cosmetic changes	2012-11-13 15:50:38 +00:00

README.txt

README
======

This README discusses issues unique to NuttX configurations for the
STMicro STM32140G-EVAL development board.

Contents
========

- Development Environment
- GNU Toolchain Options
- IDEs
- NuttX EABI "buildroot" Toolchain
- NuttX OABI "buildroot" Toolchain
- NXFLAT Toolchain
- STM3240G-EVAL-specific Configuration Options
- LEDs
- Ethernet
- PWM
- CAN
- FPU
- FSMC SRAM
- I/O Expanders
- STM3240G-EVAL-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 because the Raisonance R-Link emulatator and some RIDE7 development tools
were used and those tools works only under Windows.

GNU Toolchain Options
=====================

Toolchain Configurations
------------------------
The NuttX make system has been modified to support the following different
toolchain options.

1. The CodeSourcery GNU toolchain,
2. The Atollic Toolchain,
3. The devkitARM GNU toolchain,
4. Raisonance GNU toolchain, or
5. The NuttX buildroot Toolchain (see below).

Most testing has been conducted using the CodeSourcery toolchain for Windows and
that is the default toolchain in most configurations (FPU-related testing has
been performed with the Atolloc toolchain for windows. To use the Atollic,
devkitARM, Raisonance GNU, or NuttX buildroot toolchain, you simply need to
add one of the following configuration options to your .config (or defconfig)
file:

CONFIG_STM32_CODESOURCERYW=y : CodeSourcery under Windows
CONFIG_STM32_CODESOURCERYL=y : CodeSourcery under Linux
CONFIG_STM32_ATOLLIC_LITE=y : The free, "Lite" version of Atollic toolchain under Windows
CONFIG_STM32_ATOLLIC_PRO=y : The paid, "Pro" version of Atollic toolchain under Windows
CONFIG_STM32_DEVKITARM=y : devkitARM under Windows
CONFIG_STM32_RAISONANCE=y : Raisonance RIDE7 under Windows
CONFIG_STM32_BUILDROOT=y : NuttX buildroot under Linux or Cygwin (default)

If you change the default toolchain, then you may also have to modify the PATH in
the setenv.h file if your make cannot find the tools.

NOTE: the CodeSourcery (for Windows), Atollic, devkitARM, and Raisonance toolchains are
Windows native toolchains. The CodeSourcery (for Linux) and NuttX buildroot
toolchains are Cygwin and/or Linux native toolchains. There are several limitations
to using a Windows based toolchain 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 pathes which do not
work with the Cygwin make.

MKDEP = $(TOPDIR)/tools/mknulldeps.sh

The CodeSourcery Toolchain (2009q1)
-----------------------------------
The CodeSourcery toolchain (2009q1) does not work with default optimization
level of -Os (See Make.defs). It will work with -O0, -O1, or -O2, but not with
-Os.

The Atollic "Pro" and "Lite" Toolchain
--------------------------------------
One problem that I had with the Atollic toolchains is that the provide a gcc.exe
and g++.exe in the same bin/ file as their ARM binaries. If the Atollic bin/ path
appears in your PATH variable before /usr/bin, then you will get the wrong gcc
when you try to build host executables. This will cause to strange, uninterpretable
errors build some host binaries in tools/ when you first make.

Also, the Atollic toolchains are the only toolchains that have built-in support for
the FPU in these configurations. If you plan to use the Cortex-M4 FPU, you will
need to use the Atollic toolchain for now. See the FPU section below for more
information.

The Atollic "Lite" Toolchain
----------------------------
The free, "Lite" version of the Atollic toolchain does not support C++ nor
does it support ar, nm, objdump, or objdcopy. If you use the Atollic "Lite"
toolchain, you will have to set:

CONFIG_HAVE_CXX=n

In order to compile successfully. Otherwise, you will get errors like:

"C++ Compiler only available in TrueSTUDIO Professional"

The make may then fail in some of the post link processing because of some of
the other missing tools. The Make.defs file replaces the ar and nm with
the default system x86 tool versions and these seem to work okay. Disable all
of the following to avoid using objcopy:

CONFIG_RRLOAD_BINARY=n
CONFIG_INTELHEX_BINARY=n
CONFIG_MOTOROLA_SREC=n
CONFIG_RAW_BINARY=n

devkitARM
---------
The devkitARM toolchain includes a version of MSYS make. Make sure that the
the paths to Cygwin's /bin and /usr/bin directories appear BEFORE the devkitARM
path or will get the wrong version of make.

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.

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/stm32,
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/stm32/stm32_vectors.S. With RIDE, I have 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 <some-dir>/nuttx.

cd tools
./configure.sh stm3240g-eval/<sub-dir>

2. Download the latest buildroot package into <some-dir>

3. unpack the buildroot tarball. The resulting directory may
have versioning information on it like buildroot-x.y.z. If so,
rename <some-dir>/buildroot-x.y.z to <some-dir>/buildroot.

4. cd <some-dir>/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 <some-dir>/nuttx.

cd tools
./configure.sh lpcxpresso-lpc1768/<sub-dir>

2. Download the latest buildroot package into <some-dir>

3. unpack the buildroot tarball. The resulting directory may
have versioning information on it like buildroot-x.y.z. If so,
rename <some-dir>/buildroot-x.y.z to <some-dir>/buildroot.

4. cd <some-dir>/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.

Ethernet
========

The Ethernet driver is configured to use the MII interface:

Board Jumper Settings:

Jumper Description
JP8 To enable MII, JP8 should not be fitted.
JP6 2-3: Enable MII interface mode
JP5 2-3: Provide 25 MHz clock for MII or 50 MHz clock for RMII by MCO at PA8
SB1 Not used with MII

LEDs
====

The STM3240G-EVAL board has four LEDs labeled LD1, LD2, LD3 and LD4 on the
board.. 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/up_leds.c. The LEDs are used to encode OS-related\
events as follows:

SYMBOL Meaning LED1* LED2 LED3 LED4
------------------- ----------------------- ------- ------- ------- ------
LED_STARTED NuttX has been started ON OFF OFF OFF
LED_HEAPALLOCATE Heap has been allocated OFF ON OFF OFF
LED_IRQSENABLED Interrupts enabled ON ON OFF OFF
LED_STACKCREATED Idle stack created OFF OFF ON OFF
LED_INIRQ In an interrupt** ON N/C N/C OFF
LED_SIGNAL In a signal handler*** N/C ON N/C OFF
LED_ASSERTION An assertion failed ON ON N/C OFF
LED_PANIC The system has crashed N/C N/C N/C ON
LED_IDLE STM32 is is sleep mode (Optional, not used)

* If LED1, LED2, LED3 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 LED3 ON and LED1 faintly glowing. This faint glow
is because of timer interupts that result in the LED being illuminated
on a small proportion of the time.
*** LED2 may also flicker normally if signals are processed.

PWM
===

The STM3240G-Eval has no real on-board PWM devices, but the board can be
configured to output a pulse train using timer output pins. The following
pins have been use to generate PWM output (see board.h for some other
candidates):

TIM4 CH2. Pin PD13 is used by the FSMC (FSMC_A18) and is also connected
to the Motor Control Connector (CN5) just for this purpose. If FSMC is
not enabled, then FSMC_A18 will not be used (and will be tri-stated from
the LCD).

CONFIGURATION:

CONFIG_STM32_TIM4=y
CONFIG_PWM=n
CONFIG_PWM_PULSECOUNT=n
CONFIG_STM32_TIM4_PWM=y
CONFIG_STM32_TIM4_CHANNEL=2

ACCESS:

Daughterboard Extension Connector, CN3, pin 32
Ground is available on CN3, pin1

NOTE: TIM4 hardware will not support pulse counting.

TIM8 CH4: Pin PC9 is used by the microSD card (MicroSDCard_D1) and I2S
(I2S_CKIN) but can be completely disconnected from both by opening JP16.

CONFIGURATION:

CONFIG_STM32_TIM8=y
CONFIG_PWM=n
CONFIG_PWM_PULSECOUNT=y
CONFIG_STM32_TIM8_PWM=y
CONFIG_STM32_TIM8_CHANNEL=4

ACCESS:

Daughterboard Extension Connector, CN3, pin 17
Ground is available on CN3, pin1

CAN
===

Connector 10 (CN10) is DB-9 male connector that can be used with CAN1 or CAN2.

JP10 connects CAN1_RX or CAN2_RX to the CAN transceiver
JP3 connects CAN1_TX or CAN2_TX to the CAN transceiver

CAN signals are then available on CN10 pins:

CN10 Pin 7 = CANH
CN10 Pin 2 = CANL

Mapping to STM32 GPIO pins:

PD0 = FSMC_D2 & CAN1_RX
PD1 = FSMC_D3 & CAN1_TX
PB13 = ULPI_D6 & CAN2_TX
PB5 = ULPI_D7 & CAN2_RX

Configuration Options:

CONFIG_CAN - Enables CAN support (one or both of CONFIG_STM32_CAN1 or
CONFIG_STM32_CAN2 must also be defined)
CONFIG_CAN_EXTID - Enables support for the 29-bit extended ID. Default
Standard 11-bit IDs.
CONFIG_CAN_FIFOSIZE - The size of the circular buffer of CAN messages.
Default: 8
CONFIG_CAN_NPENDINGRTR - The size of the list of pending RTR requests.
Default: 4

CONFIG_STM32_CAN1 - Enable support for CAN1
CONFIG_CAN1_BAUD - CAN1 BAUD rate. Required if CONFIG_STM32_CAN1 is defined.
CONFIG_STM32_CAN2 - Enable support for CAN2
CONFIG_CAN2_BAUD - CAN1 BAUD rate. Required if CONFIG_STM32_CAN2 is defined.
CONFIG_CAN_TSEG1 - The number of CAN time quanta in segment 1. Default: 6
CONFIG_CAN_TSEG2 - the number of CAN time quanta in segment 2. Default: 7
CONFIG_CAN_REGDEBUG - If CONFIG_DEBUG is set, this will generate an
dump of all CAN registers.

FPU
===

FPU Configuration Options
-------------------------

There are two version of the FPU support built into the STM32 port.

1. Lazy Floating Point Register Save.

This is an untested implementation that saves and restores FPU registers
only on context switches. This means: (1) floating point registers are
not stored on each context switch and, hence, possibly better interrupt
performance. But, (2) since floating point registers are not saved,
you cannot use floating point operations within interrupt handlers.

This logic can be enabled by simply adding the following to your .config
file:

CONFIG_ARCH_FPU=y

2. Non-Lazy Floating Point Register Save

Mike Smith has contributed an extensive re-write of the ARMv7-M exception
handling logic. This includes verified support for the FPU. These changes
have not yet been incorporated into the mainline and are still considered
experimental. These FPU logic can be enabled with:

CONFIG_ARCH_FPU=y
CONFIG_ARMV7M_CMNVECTOR=y

You will probably also changes to the scripts/ld.script in if this option is selected.
This should work:

-ENTRY(_stext)
+ENTRY(__start) /* Treat __start as the anchor for dead code stripping */
+EXTERN(_vectors) /* Force the vectors to be included in the output */

CFLAGS
------

Only the Atollic toolchain has built-in support for the Cortex-M4 FPU. You will see
the following lines in each Make.defs file:

ifeq ($(CONFIG_STM32_ATOLLIC_LITE),y)
# Atollic toolchain under Windows
...
ifeq ($(CONFIG_ARCH_FPU),y)
ARCHCPUFLAGS = -mcpu=cortex-m4 -mthumb -march=armv7e-m -mfpu=fpv4-sp-d16 -mfloat-abi=hard
else
ARCHCPUFLAGS = -mcpu=cortex-m3 -mthumb -mfloat-abi=soft
endif
endif

If you are using a toolchain other than the Atollic toolchain, then to use the FPU
you will also have to modify the CFLAGS to enable compiler support for the ARMv7-M
FPU. As of this writing, there are not many GCC toolchains that will support the
ARMv7-M FPU.

As a minimum you will need to add CFLAG options to (1) enable hardware floating point
code generation, and to (2) select the FPU implementation. You might try the same
options as used with the Atollic toolchain in the Make.defs file:

ARCHCPUFLAGS = -mcpu=cortex-m4 -mthumb -march=armv7e-m -mfpu=fpv4-sp-d16 -mfloat-abi=hard

Configuration Changes
---------------------

Below are all of the configuration changes that I had to make to configs/stm3240g-eval/nsh2
in order to successfully build NuttX using the Atollic toolchain WITH FPU support:

-CONFIG_ARCH_FPU=n : Enable FPU support
+CONFIG_ARCH_FPU=y

-CONFIG_STM32_CODESOURCERYW=y : Disable the CodeSourcery toolchain
+CONFIG_STM32_CODESOURCERYW=n

-CONFIG_STM32_ATOLLIC_LITE=n : Enable *one* the Atollic toolchains
CONFIG_STM32_ATOLLIC_PRO=n
-CONFIG_STM32_ATOLLIC_LITE=y : The "Lite" version, OR
CONFIG_STM32_ATOLLIC_PRO=y : The "Pro" version (not both)

-CONFIG_INTELHEX_BINARY=y : Suppress generation FLASH download formats
+CONFIG_INTELHEX_BINARY=n : (Only necessary with the "Lite" version)

-CONFIG_HAVE_CXX=y : Suppress generation of C++ code
+CONFIG_HAVE_CXX=n : (Only necessary with the "Lite" version)

See the section above on Toolchains, NOTE 2, for explanations for some of
the configuration settings. Some of the usual settings are just not supported
by the "Lite" version of the Atollic toolchain.

FSMC SRAM
=========

On-board SRAM
-------------

A 16 Mbit SRAM is connected to the STM32F407IGH6 FSMC bus which shares the same
I/Os with the CAN1 bus. Jumper settings:

JP1: Connect PE4 to SRAM as A20
JP2: onnect PE3 to SRAM as A19

JP3 and JP10 must not be fitted for SRAM and LCD application. JP3 and JP10
select CAN1 or CAN2 if fitted; neither if not fitted.

The on-board SRAM can be configured by setting

CONFIG_STM32_FSMC=y
CONFIG_STM32_FSMC_SRAM=y
CONFIG_HEAP2_BASE=0x64000000
CONFIG_HEAP2_SIZE=2097152
CONFIG_MM_REGIONS=2 (or =3, see below)

Configuration Options
---------------------
Internal SRAM is available in all members of the STM32 family. The F4 family
also contains internal CCM SRAM. This SRAM is different because it cannot
be used for DMA. So if DMA needed, then the following should be defined
to exclude CCM SRAM from the heap:

CONFIG_STM32_CCMEXCLUDE : Exclude CCM SRAM from the HEAP

In addition to internal SRAM, SRAM may also be available through the FSMC.
In order to use FSMC SRAM, the following additional things need to be
present in the NuttX configuration file:

CONFIG_STM32_FSMC=y : Enables the FSMC
CONFIG_STM32_FSMC_SRAM=y : Indicates that SRAM is available via the
FSMC (as opposed to an LCD or FLASH).
CONFIG_HEAP2_BASE : The base address of the SRAM in the FSMC
address space
CONFIG_HEAP2_SIZE : The size of the SRAM in the FSMC
address space
CONFIG_MM_REGIONS : Must be set to a large enough value to
include the FSMC SRAM

SRAM Configurations
-------------------
There are 4 possible SRAM configurations:

Configuration 1. System SRAM (only)
CONFIG_MM_REGIONS == 1
CONFIG_STM32_FSMC_SRAM NOT defined
CONFIG_STM32_CCMEXCLUDE defined
Configuration 2. System SRAM and CCM SRAM
CONFIG_MM_REGIONS == 2
CONFIG_STM32_FSMC_SRAM NOT defined
CONFIG_STM32_CCMEXCLUDE NOT defined
Configuration 3. System SRAM and FSMC SRAM
CONFIG_MM_REGIONS == 2
CONFIG_STM32_FSMC_SRAM defined
CONFIG_STM32_CCMEXCLUDE defined
Configuration 4. System SRAM, CCM SRAM, and FSMC SRAM
CONFIG_MM_REGIONS == 3
CONFIG_STM32_FSMC_SRAM defined
CONFIG_STM32_CCMEXCLUDE NOT defined
I/O Expanders
=============

The STM3240G-EVAL has two STMPE811QTR I/O expanders on board both connected to
the STM32 via I2C1. They share a common interrupt line: PI2.

STMPE811 U24, I2C address 0x41 (7-bit)
------ ---- ---------------- --------------------------------------------
STPE11 PIN BOARD SIGNAL BOARD CONNECTION
------ ---- ---------------- --------------------------------------------
Y- TouchScreen_Y- LCD Connector XL
X- TouchScreen_X- LCD Connector XR
Y+ TouchScreen_Y+ LCD Connector XD
X+ TouchScreen_X+ LCD Connector XU
IN3 EXP_IO9
IN2 EXP_IO10
IN1 EXP_IO11
IN0 EXP_IO12

STMPE811 U29, I2C address 0x44 (7-bit)
------ ---- ---------------- --------------------------------------------
STPE11 PIN BOARD SIGNAL BOARD CONNECTION
------ ---- ---------------- --------------------------------------------
Y- EXP_IO1
X- EXP_IO2
Y+ EXP_IO3
X+ EXP_IO4
IN3 EXP_IO5
IN2 EXP_IO6
IN1 EXP_IO7
IN0 EXP_IO8

STM3240G-EVAL-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_CORTEXM4=y

CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory

CONFIG_ARCH_CHIP=stm32

CONFIG_ARCH_CHIP_name - For use in C code to identify the exact
chip:

CONFIG_ARCH_CHIP_STM32F407IG=y

CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG - Enables special STM32 clock
configuration features.

CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG=n

CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
hence, the board that supports the particular chip or SoC.

CONFIG_ARCH_BOARD=stm3240g_eval (for the STM3240G-EVAL development board)

CONFIG_ARCH_BOARD_name - For use in C code

CONFIG_ARCH_BOARD_STM3240G_EVAL=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_DRAM_SIZE - Describes the installed DRAM (SRAM in this case):

CONFIG_DRAM_SIZE=0x00010000 (64Kb)

CONFIG_DRAM_START - The start address of installed DRAM

CONFIG_DRAM_START=0x20000000

CONFIG_STM32_CCMEXCLUDE - Exclude CCM SRAM from the HEAP

In addition to internal SRAM, SRAM may also be available through the FSMC.
In order to use FSMC SRAM, the following additional things need to be
present in the NuttX configuration file:

CONFIG_STM32_FSMC_SRAM - Indicates that SRAM is available via the
FSMC (as opposed to an LCD or FLASH).

CONFIG_HEAP2_BASE - The base address of the SRAM in the FSMC address space (hex)

CONFIG_HEAP2_END - The size of the SRAM in the FSMC address space (decimal)

CONFIG_ARCH_IRQPRIO - The STM3240xxx supports interrupt prioritization

CONFIG_ARCH_IRQPRIO=y

CONFIG_ARCH_FPU - The STM3240xxx supports a floating point unit (FPU)

CONFIG_ARCH_FPU=y

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:

AHB1
----
CONFIG_STM32_CRC
CONFIG_STM32_BKPSRAM
CONFIG_STM32_CCMDATARAM
CONFIG_STM32_DMA1
CONFIG_STM32_DMA2
CONFIG_STM32_ETHMAC
CONFIG_STM32_OTGHS

AHB2
----
CONFIG_STM32_DCMI
CONFIG_STM32_CRYP
CONFIG_STM32_HASH
CONFIG_STM32_RNG
CONFIG_STM32_OTGFS

AHB3
----
CONFIG_STM32_FSMC

APB1
----
CONFIG_STM32_TIM2
CONFIG_STM32_TIM3
CONFIG_STM32_TIM4
CONFIG_STM32_TIM5
CONFIG_STM32_TIM6
CONFIG_STM32_TIM7
CONFIG_STM32_TIM12
CONFIG_STM32_TIM13
CONFIG_STM32_TIM14
CONFIG_STM32_WWDG
CONFIG_STM32_IWDG
CONFIG_STM32_SPI2
CONFIG_STM32_SPI3
CONFIG_STM32_USART2
CONFIG_STM32_USART3
CONFIG_STM32_UART4
CONFIG_STM32_UART5
CONFIG_STM32_I2C1
CONFIG_STM32_I2C2
CONFIG_STM32_I2C3
CONFIG_STM32_CAN1
CONFIG_STM32_CAN2
CONFIG_STM32_DAC1
CONFIG_STM32_DAC2
CONFIG_STM32_PWR -- Required for RTC

APB2
----
CONFIG_STM32_TIM1
CONFIG_STM32_TIM8
CONFIG_STM32_USART1
CONFIG_STM32_USART6
CONFIG_STM32_ADC1
CONFIG_STM32_ADC2
CONFIG_STM32_ADC3
CONFIG_STM32_SDIO
CONFIG_STM32_SPI1
CONFIG_STM32_SYSCFG
CONFIG_STM32_TIM9
CONFIG_STM32_TIM10
CONFIG_STM32_TIM11

Timer devices may be used for different purposes. One special purpose is
to generate modulated outputs for such things as motor control. If CONFIG_STM32_TIMn
is defined (as above) then the following may also be defined to indicate that
the timer is intended to be used for pulsed output modulation, ADC conversion,
or DAC conversion. Note that ADC/DAC require two definition: Not only do you have
to assign the timer (n) for used by the ADC or DAC, but then you also have to
configure which ADC or DAC (m) it is assigned to.

CONFIG_STM32_TIMn_PWM Reserve timer n for use by PWM, n=1,..,14
CONFIG_STM32_TIMn_ADC Reserve timer n for use by ADC, n=1,..,14
CONFIG_STM32_TIMn_ADCm Reserve timer n to trigger ADCm, n=1,..,14, m=1,..,3
CONFIG_STM32_TIMn_DAC Reserve timer n for use by DAC, n=1,..,14
CONFIG_STM32_TIMn_DACm Reserve timer n to trigger DACm, n=1,..,14, m=1,..,2

For each timer that is enabled for PWM usage, we need the following additional
configuration settings:

CONFIG_STM32_TIMx_CHANNEL - Specifies the timer output channel {1,..,4}

NOTE: The STM32 timers are each capable of generating different signals on
each of the four channels with different duty cycles. That capability is
not supported by this driver: Only one output channel per timer.

JTAG Enable settings (by default JTAG-DP and SW-DP are disabled):

CONFIG_STM32_JTAG_FULL_ENABLE - Enables full SWJ (JTAG-DP + SW-DP)
CONFIG_STM32_JTAG_NOJNTRST_ENABLE - Enables full SWJ (JTAG-DP + SW-DP)
but without JNTRST.
CONFIG_STM32_JTAG_SW_ENABLE - Set JTAG-DP disabled and SW-DP enabled

STM3240xxx specific device driver settings

CONFIG_U[S]ARTn_SERIAL_CONSOLE - selects the USARTn (n=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

CONFIG_STM32_SPI_INTERRUPTS - Select to enable interrupt driven SPI
support. Non-interrupt-driven, poll-waiting is recommended if the
interrupt rate would be to high in the interrupt driven case.
CONFIG_STM32_SPI_DMA - Use DMA to improve SPI transfer performance.
Cannot be used with CONFIG_STM32_SPI_INTERRUPT.

CONFIG_SDIO_DMA - Support DMA data transfers. Requires CONFIG_STM32_SDIO
and CONFIG_STM32_DMA2.
CONFIG_SDIO_PRI - Select SDIO interrupt prority. Default: 128
CONFIG_SDIO_DMAPRIO - Select SDIO DMA interrupt priority.
Default: Medium
CONFIG_SDIO_WIDTH_D1_ONLY - Select 1-bit transfer mode. Default:
4-bit transfer mode.

CONFIG_STM32_PHYADDR - The 5-bit address of the PHY on the board
CONFIG_STM32_MII - Support Ethernet MII interface
CONFIG_STM32_MII_MCO1 - Use MCO1 to clock the MII interface
CONFIG_STM32_MII_MCO2 - Use MCO2 to clock the MII interface
CONFIG_STM32_RMII - Support Ethernet RMII interface
CONFIG_STM32_AUTONEG - Use PHY autonegotion to determine speed and mode
CONFIG_STM32_ETHFD - If CONFIG_STM32_AUTONEG is not defined, then this
may be defined to select full duplex mode. Default: half-duplex
CONFIG_STM32_ETH100MBPS - If CONFIG_STM32_AUTONEG is not defined, then this
may be defined to select 100 MBps speed. Default: 10 Mbps
CONFIG_STM32_PHYSR - This must be provided if CONFIG_STM32_AUTONEG is
defined. The PHY status register address may diff from PHY to PHY. This
configuration sets the address of the PHY status register.
CONFIG_STM32_PHYSR_SPEED - This must be provided if CONFIG_STM32_AUTONEG is
defined. This provides bit mask indicating 10 or 100MBps speed.
CONFIG_STM32_PHYSR_100MBPS - This must be provided if CONFIG_STM32_AUTONEG is
defined. This provides the value of the speed bit(s) indicating 100MBps speed.
CONFIG_STM32_PHYSR_MODE - This must be provided if CONFIG_STM32_AUTONEG is
defined. This provide bit mask indicating full or half duplex modes.
CONFIG_STM32_PHYSR_FULLDUPLEX - This must be provided if CONFIG_STM32_AUTONEG is
defined. This provides the value of the mode bits indicating full duplex mode.
CONFIG_STM32_ETH_PTP - Precision Time Protocol (PTP). Not supported
but some hooks are indicated with this condition.

STM3240G-EVAL CAN Configuration

CONFIG_CAN - Enables CAN support (one or both of CONFIG_STM32_CAN1 or
CONFIG_STM32_CAN2 must also be defined)
CONFIG_CAN_FIFOSIZE - The size of the circular buffer of CAN messages.
Default: 8
CONFIG_CAN_NPENDINGRTR - The size of the list of pending RTR requests.
Default: 4
CONFIG_CAN_LOOPBACK - A CAN driver may or may not support a loopback
mode for testing. The STM32 CAN driver does support loopback mode.
CONFIG_CAN1_BAUD - CAN1 BAUD rate. Required if CONFIG_STM32_CAN1 is defined.
CONFIG_CAN2_BAUD - CAN1 BAUD rate. Required if CONFIG_STM32_CAN2 is defined.
CONFIG_CAN_TSEG1 - The number of CAN time quanta in segment 1. Default: 6
CONFIG_CAN_TSEG2 - the number of CAN time quanta in segment 2. Default: 7
CONFIG_CAN_REGDEBUG - If CONFIG_DEBUG is set, this will generate an
dump of all CAN registers.

STM3240G-EVAL LCD Hardware Configuration

The LCD driver supports the following LCDs on the STM324xG_EVAL board:

AM-240320L8TNQW00H (LCD_ILI9320 or LCD_ILI9321) OR
AM-240320D5TOQW01H (LCD_ILI9325)

Configuration options.

CONFIG_LCD_LANDSCAPE - Define for 320x240 display "landscape"
support. Default is this 320x240 "landscape" orientation
For the STM3240G-EVAL board, the edge opposite from the row of buttons
is used as the top of the display in this orientation.
CONFIG_LCD_RLANDSCAPE - Define for 320x240 display "reverse
landscape" support. Default is this 320x240 "landscape"
orientation
For the STM3240G-EVAL board, the edge next to the row of buttons
is used as the top of the display in this orientation.
CONFIG_LCD_PORTRAIT - Define for 240x320 display "portrait"
orientation support. In this orientation, the STM3210E-EVAL's
LCD ribbon cable is at the bottom of the display. Default is
320x240 "landscape" orientation.
In this orientation, the top of the display is to the left
of the buttons (if the board is held so that the buttons are at the
botton of the board).
CONFIG_LCD_RPORTRAIT - Define for 240x320 display "reverse
portrait" orientation support. In this orientation, the
STM3210E-EVAL's LCD ribbon cable is at the top of the display.
Default is 320x240 "landscape" orientation.
In this orientation, the top of the display is to the right
of the buttons (if the board is held so that the buttons are at the
botton of the board).
CONFIG_LCD_RDSHIFT - When reading 16-bit gram data, there appears
to be a shift in the returned data. This value fixes the offset.
Default 5.

The LCD driver dynamically selects the LCD based on the reported LCD
ID value. However, code size can be reduced by suppressing support for
individual LCDs using:

CONFIG_STM32_ILI9320_DISABLE (includes ILI9321)
CONFIG_STM32_ILI9325_DISABLE

STM32 USB OTG FS Host Driver Support

Pre-requisites

CONFIG_USBHOST - Enable USB host support
CONFIG_STM32_OTGFS - Enable the STM32 USB OTG FS block
CONFIG_STM32_SYSCFG - Needed
CONFIG_SCHED_WORKQUEUE - Worker thread support is required

Options:

CONFIG_STM32_OTGFS_RXFIFO_SIZE - Size of the RX FIFO in 32-bit words.
Default 128 (512 bytes)
CONFIG_STM32_OTGFS_NPTXFIFO_SIZE - Size of the non-periodic Tx FIFO
in 32-bit words. Default 96 (384 bytes)
CONFIG_STM32_OTGFS_PTXFIFO_SIZE - Size of the periodic Tx FIFO in 32-bit
words. Default 96 (384 bytes)
CONFIG_STM32_OTGFS_DESCSIZE - Maximum size of a descriptor. Default: 128
CONFIG_STM32_OTGFS_SOFINTR - Enable SOF interrupts. Why would you ever
want to do that?
CONFIG_STM32_USBHOST_REGDEBUG - Enable very low-level register access
debug. Depends on CONFIG_DEBUG.
CONFIG_STM32_USBHOST_PKTDUMP - Dump all incoming and outgoing USB
packets. Depends on CONFIG_DEBUG.

Configurations
==============

Each STM3240G-EVAL configuration is maintained in a sudirectory and
can be selected as follow:

cd tools
./configure.sh stm3240g-eval/<subdir>
cd -
. ./setenv.sh

Where <subdir> is one of the following:

dhcpd:
-----

This builds the DCHP server using the apps/examples/dhcpd application
(for execution from FLASH.) See apps/examples/README.txt for information
about the dhcpd example. The server address is 10.0.0.1 and it serves
IP addresses in the range 10.0.0.2 through 10.0.0.17 (all of which, of
course, are configurable).

CONFIG_STM32_CODESOURCERYW=y : CodeSourcery under Windows

discover:
--------
This configuration exercises netutils/discover utility using
apps/exmaples/discover. This example initializes and starts the UDP
discover daemon. This daemon is useful for discovering devices in
local networks, especially with DHCP configured devices. It listens
for UDP broadcasts which also can include a device class so that
groups of devices can be discovered. It is also possible to address all
classes with a kind of broadcast discover.

Configuration settings that you may need to change for your
environment:

CONFIG_STM32_CODESOURCERYL=y - CodeSourcery for Linux
CONFIG_EXAMPLES_DISCOVER_DHCPC=y - DHCP Client
CONFIG_EXAMPLES_DISCOVER_IPADDR - (not defined)
CONFIG_EXAMPLES_DISCOVER_DRIPADDR - Router IP address

NOTE: This configuration uses to the mconf configuration tool to control
the configuration. See the section entitled "NuttX Configuration Tool"
in the top-level README.txt file.

nettest:
-------

This configuration directory may be used to verify networking performance
using the STM32's Ethernet controller. It uses apps/examples/nettest to excercise the
TCP/IP network.

CONFIG_EXAMPLES_NETTEST_SERVER=n : Target is configured as the client
CONFIG_EXAMPLES_NETTEST_PERFORMANCE=y : Only network performance is verified.
CONFIG_EXAMPLES_NETTEST_IPADDR=(10<<24|0<<16|0<<8|2) : Target side is IP: 10.0.0.2
CONFIG_EXAMPLES_NETTEST_DRIPADDR=(10<<24|0<<16|0<<8|1) : Host side is IP: 10.0.0.1
CONFIG_EXAMPLES_NETTEST_CLIENTIP=(10<<24|0<<16|0<<8|1) : Server address used by which ever is client.

nsh:
---
Configures the NuttShell (nsh) located at apps/examples/nsh. The
Configuration enables both the serial and telnet NSH interfaces.

CONFIG_STM32_CODESOURCERYW=y : CodeSourcery under Windows
CONFIG_NSH_DHCPC=n : DHCP is disabled
CONFIG_NSH_IPADDR=(10<<24|0<<16|0<<8|2) : Target IP address 10.0.0.2
CONFIG_NSH_DRIPADDR=(10<<24|0<<16|0<<8|1) : Host IP address 10.0.0.1

NOTES:
1. This example assumes that a network is connected. During its
initialization, it will try to negotiate the link speed. If you have
no network connected when you reset the board, there will be a long
delay (maybe 30 seconds?) before anything happens. That is the timeout
before the networking finally gives up and decides that no network is
available.

2. This example supports the ADC test (apps/examples/adc) but this must
be manually enabled by selecting:

CONFIG_ADC=y : Enable the generic ADC infrastructure
CONFIG_STM32_ADC3=y : Enable ADC3
CONFIG_STM32_TIM1=y : Enable Timer 1
CONFIG_STM32_TIM1_ADC=y : Indicate that timer 1 will be used to trigger an ADC
CONFIG_STM32_TIM1_ADC3=y : Assign timer 1 to drive ADC3 sampling
CONFIG_STM32_ADC3_SAMPLE_FREQUENCY=100 : Select a sampling frequency

See also apps/examples/README.txt

Special CAN-only debug options:

CONFIG_DEBUG_CAN
CONFIG_CAN_REGDEBUG

5. This example can support an FTP client. In order to build in FTP client
support simply uncomment the following lines in the appconfig file (before
configuring) or in the apps/.config file (after configuring):

#CONFIGURED_APPS += netutils/ftpc
#CONFIGURED_APPS += examples/ftpc

6. This example can support an FTP server. In order to build in FTP server
support simply uncomment the following lines in the appconfig file (before
configuring) or in the apps/.config file (after configuring):

#CONFIGURED_APPS += netutils/ftpd
#CONFIGURED_APPS += examples/ftpd

And enable poll() support in the NuttX configuration file:

CONFIG_DISABLE_POLL=n

7. This example supports the watchdog timer test (apps/examples/watchdog)
but this must be manually enabled by selecting:

CONFIG_WATCHDOG=y : Enables watchdog timer driver support
CONFIG_STM32_WWDG=y : Enables the WWDG timer facility, OR
CONFIG_STM32_IWDG=y : Enables the IWDG timer facility (but not both)

The WWDG watchdog is driven off the (fast) 42MHz PCLK1 and, as result,
has a maximum timeout value of 49 milliseconds. For WWDG watchdog, you
should also add the fillowing to the configuration file:

CONFIG_EXAMPLES_WATCHDOG_PINGDELAY=20
CONFIG_EXAMPLES_WATCHDOG_TIMEOUT=49

The IWDG timer has a range of about 35 seconds and should not be an issue.

7. Adding LCD and graphics support:

appconfig (apps/.config): Enable the application configurations that you
want to use. Asexamples:

CONFIGURED_APPS += examples/nx : Pick one or more
CONFIGURED_APPS += examples/nxhello :
CONFIGURED_APPS += examples/nximage :
CONFIGURED_APPS += examples/nxlines :

defconfig (nuttx/.config):

CONFIG_STM32_FSMC=y : FSMC support is required for the LCD
CONFIG_NX=y : Enable graphics suppport
CONFIG_MM_REGIONS=3 : When FSMC is enabled, so is the on-board SRAM memory region

8. USB OTG FS Device or Host Support

CONFIG_USBDEV - Enable USB device support, OR
CONFIG_USBHOST - Enable USB host support
CONFIG_STM32_OTGFS - Enable the STM32 USB OTG FS block
CONFIG_STM32_SYSCFG - Needed
CONFIG_SCHED_WORKQUEUE - Worker thread support is required

9. USB OTG FS Host Support. The following changes will enable support for
a USB host on the STM32F4Discovery, including support for a mass storage
class driver:

CONFIG_USBDEV=n - Make sure tht USB device support is disabled
CONFIG_USBHOST=y - Enable USB host support
CONFIG_STM32_OTGFS=y - Enable the STM32 USB OTG FS block
CONFIG_STM32_SYSCFG=y - Needed for all USB OTF FS support
CONFIG_SCHED_WORKQUEUE=y - Worker thread support is required for the mass
storage class driver.
CONFIG_NSH_ARCHINIT=y - Architecture specific USB initialization
is needed for NSH
CONFIG_FS_FAT=y - Needed by the USB host mass storage class.

With those changes, you can use NSH with a FLASH pen driver as shown
belong. Here NSH is started with nothing in the USB host slot:

NuttShell (NSH) NuttX-x.yy
nsh> ls /dev
/dev:
console
null
ttyS0

After inserting the FLASH drive, the /dev/sda appears and can be
mounted like this:

nsh> ls /dev
/dev:
console
null
sda
ttyS0
nsh> mount -t vfat /dev/sda /mnt/stuff
nsh> ls /mnt/stuff
/mnt/stuff:
-rw-rw-rw- 16236 filea.c

And files on the FLASH can be manipulated to standard interfaces:

nsh> echo "This is a test" >/mnt/stuff/atest.txt
nsh> ls /mnt/stuff
/mnt/stuff:
-rw-rw-rw- 16236 filea.c
-rw-rw-rw- 16 atest.txt
nsh> cat /mnt/stuff/atest.txt
This is a test
nsh> cp /mnt/stuff/filea.c fileb.c
nsh> ls /mnt/stuff
/mnt/stuff:
-rw-rw-rw- 16236 filea.c
-rw-rw-rw- 16 atest.txt
-rw-rw-rw- 16236 fileb.c

To prevent data loss, don't forget to un-mount the FLASH drive
before removing it:

nsh> umount /mnt/stuff

11. By default, this configuration supports /dev/random using the STM32's
RNG hardware. This can be disabled as follows:

-CONFIG_STM32_RNG=y
+CONFIG_STM32_RNG=n

-CONFIG_DEV_RANDOM=y
+CONFIG_DEV_RANDOM=n

12. This configuration requires that jumper JP22 be set to enable RS-232
operation.

nsh2:
-----

This is an alternative NSH configuration. One limitation of the STM3240G-EVAL
board is that you cannot have both a UART-based NSH console and SDIO support.
The nsh2 differs from the nsh configuration in the following ways:

-CONFIG_STM32_USART3=y : USART3 is disabled
+CONFIG_STM32_USART3=n

-CONFIG_STM32_SDIO=n : SDIO is enabled
+CONFIG_STM32_SDIO=y

Logically, these are the only differences: This configuration has SDIO (and
the SD card) enabled and the serial console disabled. There is ONLY a
Telnet console!.

There are some special settings to make life with only a Telnet

CONFIG_SYSLOG=y - Enables the System Logging feature.
CONFIG_RAMLOG=y - Enable the RAM-based logging feature.
CONFIG_RAMLOG_CONSOLE=y - Use the RAM logger as the default console.
This means that any console output from non-Telnet threads will
go into the circular buffer in RAM.
CONFIG_RAMLOG_SYSLOG - This enables the RAM-based logger as the
system logger. This means that (1) in addition to the console
output from other tasks, ALL of the debug output will also to
to the circular buffer in RAM, and (2) NSH will now support a
command called 'dmesg' that can be used to dump the RAM log.

There are a few other configuration differences as necessary to support
this different device configuration. Just the do the 'diff' if you are
curious.

NOTES:
1. See the notes for the nsh configuration. Most also apply to the nsh2
configuration. Like the nsh configuration, this configuration can
be modified to support a variety of additional tests.

2. RS-232 is disabled, but Telnet is still available for use as a console.
Since RS-232 and SDIO use the same pins (one controlled by JP22), RS232
and SDIO cannot be used concurrently.

3. This configuration requires that jumper JP22 be set to enable SDIO
operation. To enable MicroSD Card, which shares same I/Os with RS-232,
JP22 is not fitted.

4. In order to use SDIO without overruns, DMA must be used. The STM32 F4
has 192Kb of SRAM in two banks: 112Kb of "system" SRAM located at
0x2000:0000 and 64Kb of "CCM" SRAM located at 0x1000:0000. It appears
that you cannot perform DMA from CCM SRAM. The work around that I have now
is simply to omit the 64Kb of CCM SRAM from the heap so that all memory is
allocated from System SRAM. This is done by setting:

CONFIG_MM_REGIONS=1

Then DMA works fine. The downside is, of course, is that we lose 64Kb
of precious SRAM.

5. Another SDIO/DMA issue. This one is probably a software bug. This is
the bug as stated in the TODO list:

"If you use a large I/O buffer to access the file system, then the
MMCSD driver will perform multiple block SD transfers. With DMA
ON, this seems to result in CRC errors detected by the hardware
during the transfer. Workaround: CONFIG_MMCSD_MULTIBLOCK_DISABLE=y"

For this reason, CONFIG_MMCSD_MULTIBLOCK_DISABLE=y appears in the defconfig
file.

6. Another DMA-related concern. I see this statement in the reference
manual: "The burst configuration has to be selected in order to respect
the AHB protocol, where bursts must not cross the 1 KB address boundary
because the minimum address space that can be allocated to a single slave
is 1 KB. This means that the 1 KB address boundary should not be crossed
by a burst block transfer, otherwise an AHB error would be generated,
that is not reported by the DMA registers."

There is nothing in the DMA driver to prevent this now.

nxconsole:
----------
This is yet another NSH configuration. This NSH configuration differs
from the others, however, in that it uses the NxConsole driver to host
the NSH shell.

Some of the differences in this configuration and the normal nsh configuration
include these settings in the defconfig file:

These select NX Multi-User mode:

CONFG_NX_MULTIUSER=y
CONFIG_DISABLE_MQUEUE=n

The following definition in the defconfig file to enables the NxConsole
driver:

CONFIG_NXCONSOLE=y

The appconfig file selects examples/nxconsole instead of examples/nsh:

CONFIGURED_APPS += examples/nxconsole

Other configuration settings:

CONFIG_STM32_CODESOURCERYW=y : CodeSourcery under Windows
CONFIG_LCD_LANDSCAPE=y : 320x240 landscape

nxwm
----
This is a special configuration setup for the NxWM window manager
UnitTest. The NxWM window manager can be found here:

nuttx-code/NxWidgets/nxwm

The NxWM unit test can be found at:

nuttx-code/NxWidgets/UnitTests/nxwm

Documentation for installing the NxWM unit test can be found here:

nuttx-code/NxWidgets/UnitTests/README.txt

Here is the quick summary of the build steps (Assuming that all of
the required packages are available in a directory ~/nuttx-code):

1. Intall the nxwm configuration

$ cd ~/nuttx-code/nuttx/tools
$ ./configure.sh stm3240g-eval/nxwm

2. Make the build context (only)

$ cd ..
$ . ./setenv.sh
$ make context
...

3. Install the nxwm unit test

$ cd ~/nuttx-code/NxWidgets
$ tools/install.sh ~/nuttx-code/apps nxwm
Creating symbolic link
- To ~/nuttx-code/NxWidgets/UnitTests/nxwm
- At ~/nuttx-code/apps/external

4. Build the NxWidgets library

$ cd ~/nuttx-code/NxWidgets/libnxwidgets
$ make TOPDIR=~/nuttx-code/nuttx
...

5. Build the NxWM library

$ cd ~/nuttx-code/NxWidgets/nxwm
$ make TOPDIR=~/nuttx-code/nuttx
...

6. Built NuttX with the installed unit test as the application

$ cd ~/nuttx-code/nuttx
$ make

ostest:
------
This configuration directory, performs a simple OS test using
examples/ostest. By default, this project assumes that you are
using the DFU bootloader.

CONFIG_STM32_CODESOURCERYW=y : CodeSourcery under Windows

If you use the Atollic toolchain, then the FPU test can be enabled in the
examples/ostest by adding the following your NuttX configuration file:

-CONFIG_ARCH_FPU=n : Enable FPU support
+CONFIG_ARCH_FPU=y

-CONFIG_STM32_CODESOURCERYW=y : Disable the CodeSourcery toolchain
+CONFIG_STM32_CODESOURCERYW=n

-CONFIG_INTELHEX_BINARY=y : Suppress generation FLASH download formats
+CONFIG_INTELHEX_BINARY=n : (Only necessary with the "Lite" version)

-CONFIG_HAVE_CXX=y : Suppress generation of C++ code
+CONFIG_HAVE_CXX=n : (Only necessary with the "Lite" version)

-CONFIG_SCHED_WAITPID=y : Enable the waitpid() API needed by the FPU test
+CONFIG_SCHED_WAITPID=n

The FPU test also needs to know the size of the FPU registers save area in
bytes (see arch/arm/include/armv7-m/irq_lazyfpu.h):

+CONFIG_EXAMPLES_OSTEST_FPUSIZE=(4*33)

telnetd:
--------

A simple test of the Telnet daemon(see apps/netutils/README.txt,
apps/examples/README.txt, and apps/examples/telnetd). This is
the same daemon that is used in the nsh configuration so if you
use NSH, then you don't care about this. This test is good for
testing the Telnet daemon only because it works in a simpler
environment than does the nsh configuration.

xmlrpc
------

An example configuration for the Embeddable Lightweight XML-RPC
Server at apps/examples/xmlrpc. See http://www.drdobbs.com/web-development/\
an-embeddable-lightweight-xml-rpc-server/184405364 for more info.
Contributed by Max Holtzberg.