incubator-nuttx

History

Gregory Nutt 691d7c9819 Rename usbhost_storageinit() to usbhost_msc_initialize(). Add calls to usbhost_cdcacm_initialize() is CONFIG_USBHOST_CDCACM is selected.		2015-05-06 14:11:29 -06:00
..
extflash	NSH initialization now calls boardctl(BOARDIOC_INIT) instead of board_app_initaliaze. Modify all configurations: Make sure that CONFIG_LIB_BOARDCTL=y appears wherever CONFIG_NSH_ARCHINIT=y appears. Remove support for CONFIG_NSH_ARCHMAC. It is not used and there are better ways to do that operation	2015-03-31 12:14:16 -06:00
include	Make some file section headers more consistent with standard	2015-04-08 09:15:17 -06:00
lcd	STM32F429i Disco: (1) Fix a bad return value if the LCD driver is already initialized. (2) The LCD driver initialization is now performed during the early boot sequence. (3) Increased the size of the message queue from 32 to 64 in the lcd configuration. From Marco, ocram.lhark@yahoo.com.	2015-04-17 07:04:53 -06:00
ltdc	Add support for the new DMA2D features to the STM32F429i-Disco LTDC configuration. From Marco Krahl.	2015-04-16 09:11:53 -06:00
nsh	STM32F429i-Disco: Add some missing USB host configureation. Fix some some duplicate class registration that causes infinite loops in USB registry searches	2015-04-30 13:01:29 -06:00
scripts	…
src	Rename usbhost_storageinit() to usbhost_msc_initialize(). Add calls to usbhost_cdcacm_initialize() is CONFIG_USBHOST_CDCACM is selected.	2015-05-06 14:11:29 -06:00
usbmsc	NSH initialization now calls boardctl(BOARDIOC_INIT) instead of board_app_initaliaze. Modify all configurations: Make sure that CONFIG_LIB_BOARDCTL=y appears wherever CONFIG_NSH_ARCHINIT=y appears. Remove support for CONFIG_NSH_ARCHMAC. It is not used and there are better ways to do that operation	2015-03-31 12:14:16 -06:00
usbnsh	NSH initialization now calls boardctl(BOARDIOC_INIT) instead of board_app_initaliaze. Modify all configurations: Make sure that CONFIG_LIB_BOARDCTL=y appears wherever CONFIG_NSH_ARCHINIT=y appears. Remove support for CONFIG_NSH_ARCHMAC. It is not used and there are better ways to do that operation	2015-03-31 12:14:16 -06:00
Kconfig	STM32F429i-Disco: Add some missing USB host configureation. Fix some some duplicate class registration that causes infinite loops in USB registry searches	2015-04-30 13:01:29 -06:00
README.txt	STM32F429i-Disco: Add some missing USB host configureation. Fix some some duplicate class registration that causes infinite loops in USB registry searches	2015-04-30 13:01:29 -06:00

README.txt

README
======

This README discusses issues unique to NuttX configurations for the
STMicro STM32F429I-DISCO development board featuring the STM32F429ZIT6
MCU. The STM32F429ZIT6 is a 180MHz Cortex-M4 operation with 2Mbit Flash
memory and 256kbytes. The board features:

- On-board ST-LINK/V2 for programming and debugging,
- On-board 64 Mbits (8 Mbytes) External SDRAM (1 Mbit x 16-bit x 4-bank)
- LIS302DL, ST MEMS motion sensor, 3-axis digital output accelerometer,
- TFT 2.4" LCD, 262K color RGB, 240 x 320 pixels
- Touchscreen controller
- Two user LEDs and two push-buttons,
- USB OTG FS with micro-AB connector, and
- Easy access to most MCU pins.

NOTE: Includes basic NSH command support with full 8MByte SDRAM + the
internal 256K. Unsupported are the LCD and USB interfaces.

The board pin configuration to support on-board SDRAM and LCD
prevents use of the OTG FS module which is normally used for USB
NSH sessions. Instead, the board routes the OTG HS pins to the
USB OTG connector.

The NSH configuration / testing that has been done so far was
performed by connecting an external RS-232 line driver to pins
PA9 (TX) and PA10 (RX) and configuring UART1 as the NSH console.

Refer to the http://www.st.com website for further information about this
board (search keyword: 429i-disco)

Contents
========

- Development Environment
- GNU Toolchain Options
- LEDs
- UARTs
- Timer Inputs/Outputs
- FPU
- FSMC SRAM
- STM32F429I-DISCO-specific Configuration Options
- Configurations

Development Environment
=======================

The Development environments for the STM32F429I-DISCO board are identical
to the environments for other STM32F boards. For full details on the
environment options and setup, see the README.txt file in the
config/stm32f4discovery directory.

LEDs
====

The STM32F429I-DISCO board has two user LEDs; green, and red on the board
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
green red
------------------- ----------------------- ------- -------
LED_STARTED NuttX has been started ON OFF
LED_HEAPALLOCATE Heap has been allocated OFF ON
LED_IRQSENABLED Interrupts enabled ON ON
LED_STACKCREATED Idle stack created OFF ON
LED_INIRQ In an interrupt** ON ON
LED_SIGNAL In a signal handler N/C ON
LED_ASSERTION An assertion failed ON ON
LED_PANIC The system has crashed ON BLINK
LED_IDLE STM32 is is sleep mode (Optional, not used)

* In normal mode, LED1 will be on and LED2 might flicker a bit as IRQs
and SIGNALS are processed.
* If LED1 is on and LED2 is blinking, then NuttX probably failed to boot
or is in a PANIC condition.

UARTs
=====

On the STM32F429I-DISCO board, because of pin mappings to support the
onboard SDRAM and LCD, the only UARTs that has both RX and TX pins
avilalbe are USART1 and UART5. Other USARTS could be used for RX or TX
only, or they could be used for full-duplex if the other pin functions
aren't being used (i.e. LCD or SDRAM).

UART/USART PINS
---------------

USART1
CK PA8
CTS PA11*
RTS PA12*
RX PA10*, PB7*
TX PA9*, PB6*
USART2
CK PA4*, PD7
CTS PA0*, PD3
RTS PA1, PD4*
RX PA3, PD6
TX PA2, PD5*
USART3
CK PB12, PC12*, PD10
CTS PB13, PD11
RTS PB14, PD12*
RX PB11, PC11, PD9
TX PB10*, PC10*, PD8
UART4
RX PA1, PC11
TX PA0*, PC10*
UART5
RX PD2
TX PC12*
USART6
CK PC8, PG7*
CTS PG13*, PG15*
RTS PG12*, PG8*
RX PC7*, PG9*
TX PC6, PG14*
UART7
RX PE7*,PF6*
TX PE8*,PF7*

* Indicates pins that have other on-board functions and should be used only
with care (See table 6 in the STM32F429I-DISCO User Guide for a list of free
I/O pins on the board).

Default USART/UART Configuration
--------------------------------

USART1 is enabled in all configurations (see */defconfig). RX and TX are
configured on pins PA3 and PA2, respectively (see include/board.h).

Timer Inputs/Outputs
====================

TIM1
CH1 PA8, PE9
CH2 PA9*, PE11
CH3 PA10*, PE13
CH4 PA11*, PE14
TIM2
CH1 PA0*, PA15, PA5*
CH2 PA1, PB3*
CH3 PA2, PB10*
CH4 PA3, PB11
TIM3
CH1 PA6*, PB4, PC6
CH2 PA7*, PB5, PC7*
CH3 PB0, PC8
CH4 PB1, PC9
TIM4
CH1 PB6*, PD12*
CH2 PB7, PD13*
CH3 PB8, PD14*
CH4 PB9*, PD15*
TIM5
CH1 PA0*, PH10**
CH2 PA1, PH11**
CH3 PA2, PH12**
CH4 PA3, PI0
TIM8
CH1 PC6, PI5
CH2 PC7*, PI6
CH3 PC8, PI7
CH4 PC9, PI2
TIM9
CH1 PA2, PE5
CH2 PA3, PE6
TIM10
CH1 PB8, PF6
TIM11
CH1 PB9*, PF7
TIM12
CH1 PH6**, PB14
CH2 PC15, PH9**
TIM13
CH1 PA6*, PF8
TIM14
CH1 PA7*, PF9

* Indicates pins that have other on-board functions and should be used only
with care (See table 5 in the STM32F429I-DISCO User Guide). The rest are
free I/O pins.
** Port H pins are not supported by the MCU

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 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 recent GCC toolchains have built-in support for the Cortex-M4 FPU. You will see
the following lines in each Make.defs file:

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

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_ARMV7M_TOOLCHAIN_CODESOURCERYW=y : Disable the CodeSourcery toolchain
+CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYW=n

-CONFIG_ARMV7M_TOOLCHAIN_ATOLLIC=n : Enable the Atollic toolchain
+CONFIG_ARMV7M_TOOLCHAIN_ATOLLIC=y :

-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.

FMC SDRAM
=========

On-board SDRAM
--------------
The STM32F429I-DISCO has 8 MBytes on-board SDRAM connected to the MCU's
SDRAM Bank 2 connections (Bank 6 of the FSMC). This means the 8 MBytes
(when enabled) is mapped to address 0xD0000000-0xD07FFFFF. The port for
the STM32F429I-DISCO board includes support for using the onboard 8M SDRAM.

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 and the 8MByte SDRAM
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. This should be 0xD0000000.
CONFIG_HEAP2_SIZE : The size of the SRAM in the FSMC
address space. This should be 8388608.
CONFIG_MM_REGIONS : Must be set to a large enough value to
include the FSMC SDRAM (1, 2 or 3 depending
if the CCM RAM and/or FSCM SDRAM are enabled).

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

STM32F429I-DISCO-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_STM32F407VG=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=STM32F429I-DISCO (for the STM32F429I-DISCO development board)

CONFIG_ARCH_BOARD_name - For use in C code

CONFIG_ARCH_BOARD_STM32F4_DISCOVERY=y

CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation
of delay loops

CONFIG_ENDIAN_BIG - define if big endian (default is little
endian)

CONFIG_RAM_SIZE - Describes the installed DRAM (SRAM in this case):

CONFIG_RAM_SIZE=0x00010000 (64Kb)

CONFIG_RAM_START - The start address of installed DRAM

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

CONFIG_ARCH_FPU - The STM32F429I-DISCO 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 only SW-DP is enabled):

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

STM32F429I-DISCO 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

STM32F429I-DISCO CAN Configuration

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_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.

STM32F429I-DISCO SPI Configuration

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.

STM32F429I-DISCO DMA Configuration

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.

STM32 USB OTG FS Host Driver Support

Pre-requisites

CONFIG_USBDEV - Enable USB device support
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 STM32F429I-DISCO configuration is maintained in a sub-directory and
can be selected as follow:

cd tools
./configure.sh STM32F429I-DISCO/<subdir>
cd -
. ./setenv.sh

If this is a Windows native build, then configure.bat should be used
instead of configure.sh:

configure.bat STM32F429I-DISCO\<subdir>

Where <subdir> is one of the following:

ltdc:
----
STM32F429I-DISCO LTDC Framebuffer demo example. See
configs/stm32f429i-disco/ltdc/README.txt for additional information.

nsh:
---
Configures the NuttShell (nsh) located at apps/examples/nsh. The
Configuration enables the serial interfaces on UART2. Support for
builtin applications is enabled, but in the base configuration no
builtin applications are selected (see NOTES below).

NOTES:

1. This configuration uses the mconf-based configuration tool. To
change this configuration 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. By default, this configuration uses the CodeSourcery toolchain
for Windows and builds under Cygwin (or probably MSYS). That
can easily be reconfigured, of course.

CONFIG_HOST_WINDOWS=y : Builds under Windows
CONFIG_WINDOWS_CYGWIN=y : Using Cygwin
CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYW=y : CodeSourcery for Windows

3. This example supports the PWM test (apps/examples/pwm) but this must
be manually enabled by selecting:

CONFIG_PWM=y : Enable the generic PWM infrastructure
CONFIG_STM32_TIM4=y : Enable TIM4
CONFIG_STM32_TIM4_PWM=y : Use TIM4 to generate PWM output