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7.7 KiB
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Nucleo-L452RE README
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====================
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This README file discusses the port of NuttX to the STMicro Nucleo-L452RE
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board. That board features the STM32L452RET6 MCU with 512KiB of FLASH
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and 160KiB of SRAM.
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Contents
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========
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- Status
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- Nucleo-64 Boards
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- LEDs
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- Buttons
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- Serial Console
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- Configurations
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Status
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======
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2017-05-04: The board now boots and the basic NSH configurations works
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without problem.
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Nucleo-64 Boards
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================
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The Nucleo-L452RE is a member of the Nucleo-64 board family. The Nucleo-64
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is a standard board for use with several STM32 parts in the LQFP64 package.
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Variants including:
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Order code Targeted STM32
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------------- --------------
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NUCLEO-F030R8 STM32F030R8T6
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NUCLEO-F070RB STM32F070RBT6
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NUCLEO-F072RB STM32F072RBT6
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NUCLEO-F091RC STM32F091RCT6
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NUCLEO-F103RB STM32F103RBT6
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NUCLEO-F302R8 STM32F302R8T6
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NUCLEO-F303RE STM32F303RET6
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NUCLEO-F334R8 STM32F334R8T6
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NUCLEO-F401RE STM32F401RET6
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NUCLEO-F410RB STM32F410RBT6
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NUCLEO-F411RE STM32F411RET6
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NUCLEO-F446RE STM32F446RET6
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NUCLEO-L053R8 STM32L053R8T6
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NUCLEO-L073RZ STM32L073RZT6
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NUCLEO-L152RE STM32L152RET6
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NUCLEO-L452RE STM32L452RET6
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NUCLEO-L476RG STM32L476RGT6
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LEDs
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====
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The Nucleo-64 board has one user controlable LED, User LD2. This green
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LED is a user LED connected to Arduino signal D13 corresponding to STM32
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I/O PA5 (PB13 on other some other Nucleo-64 boards).
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- When the I/O is HIGH value, the LED is on
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- When the I/O is LOW, the LED is off
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These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
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defined. In that case, the usage by the board port is defined in
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include/board.h and src/stm32_autoleds.c. The LEDs are used to encode
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OS-related events as follows when the red LED (PE24) is available:
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SYMBOL Meaning LD2
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------------------- ----------------------- -----------
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LED_STARTED NuttX has been started OFF
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LED_HEAPALLOCATE Heap has been allocated OFF
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LED_IRQSENABLED Interrupts enabled OFF
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LED_STACKCREATED Idle stack created ON
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LED_INIRQ In an interrupt No change
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LED_SIGNAL In a signal handler No change
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LED_ASSERTION An assertion failed No change
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LED_PANIC The system has crashed Blinking
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LED_IDLE MCU is is sleep mode Not used
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Thus if LD2, NuttX has successfully booted and is, apparently, running
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normally. If LD2 is flashing at approximately 2Hz, then a fatal error
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has been detected and the system has halted.
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Buttons
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=======
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B1 USER: the user button is connected to the I/O PC13 (pin 2) of the STM32
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microcontroller.
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Serial Console
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==============
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USART1
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------
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Pins and Connectors:
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RXD: PA10 D3 CN9 pin 3, CN10 pin 33
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PB7 CN7 pin 21
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TXD: PA9 D8 CN5 pin 1, CN10 pin 21
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PB6 D10 CN5 pin 3, CN10 pin 17
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NOTE: You may need to edit the include/board.h to select different USART1
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pin selections.
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TTL to RS-232 converter connection:
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Nucleo CN10 STM32F072RB
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----------- ------------
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Pin 21 PA9 USART1_TX *Warning you make need to reverse RX/TX on
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Pin 33 PA10 USART1_RX some RS-232 converters
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Pin 20 GND
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Pin 8 U5V
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To configure USART1 as the console:
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CONFIG_STM32_USART1=y
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CONFIG_USART1_SERIALDRIVER=y
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CONFIG_USART1_SERIAL_CONSOLE=y
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CONFIG_USART1_RXBUFSIZE=256
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CONFIG_USART1_TXBUFSIZE=256
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CONFIG_USART1_BAUD=115200
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CONFIG_USART1_BITS=8
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CONFIG_USART1_PARITY=0
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CONFIG_USART1_2STOP=0
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USART2
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------
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Pins and Connectors:
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RXD: PA3 To be provided
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PA15
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PD6
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TXD: PA2
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PA14
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PD5
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See "Virtual COM Port" and "RS-232 Shield" below.
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USART3
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------
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Pins and Connectors:
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RXD: PB11 To be provided
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PC5
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PC11
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D9
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TXD: PB10
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PC4
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PC10
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D8
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USART3
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------
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Pins and Connectors:
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RXD: PA1 To be provided
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PC11
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TXD: PA0
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PC10
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Virtual COM Port
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----------------
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Yet another option is to use UART2 and the USB virtual COM port. This
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option may be more convenient for long term development, but is painful
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to use during board bring-up.
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Solder Bridges. This configuration requires:
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- SB62 and SB63 Open: PA2 and PA3 on STM32 MCU are disconnected to D1
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and D0 (pin 7 and pin 8) on Arduino connector CN9 and ST Morpho
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connector CN10.
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- SB13 and SB14 Closed: PA2 and PA3 on STM32F103C8T6 (ST-LINK MCU) are
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connected to PA3 and PA2 on STM32 MCU to have USART communication
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between them. Thus SB61, SB62 and SB63 should be OFF.
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Configuring USART2 is the same as given above.
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115200 8N1 BAUD should be configure to interface with the Virtual COM
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port.
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Default
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-------
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As shipped, SB62 and SB63 are open and SB13 and SB14 closed, so the
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virtual COM port is enabled.
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RS-232 Shield
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-------------
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Supports a single RS-232 connected via
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Nucleo STM32F4x1RE Shield
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--------- --------------- --------
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CN9 Pin 1 PA3 USART2_RXD RXD
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CN9 Pin 2 PA2 USART2_TXD TXD
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Support for this shield is enabled by selecting USART2 and configuring
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SB13, 14, 62, and 63 as described above under "Virtual COM Port"
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Configurations
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==============
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Information Common to All Configurations
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----------------------------------------
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Each configuration is maintained in a sub-directory and can be
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selected as follow:
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tools/configure.sh nucleo-l452re/<subdir>
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Before building, make sure the PATH environment variable includes the
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correct path to the directory than holds your toolchain binaries.
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And then build NuttX by simply typing the following. At the conclusion of
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the make, the nuttx binary will reside in an ELF file called, simply, nuttx.
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make oldconfig
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make
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The <subdir> that is provided above as an argument to the tools/configure.sh
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must be is one of the following.
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NOTES:
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1. These configurations use the mconf-based configuration tool. To
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change any of these configurations 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.
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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. Unless stated otherwise, all configurations generate console
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output on USART2, as described above under "Serial Console". The
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elevant configuration settings are listed below:
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CONFIG_STM32_USART2=y
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CONFIG_STM32_USART2_SERIALDRIVER=y
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CONFIG_STM32_USART=y
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CONFIG_USART2_SERIALDRIVER=y
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CONFIG_USART2_SERIAL_CONSOLE=y
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CONFIG_USART2_RXBUFSIZE=256
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CONFIG_USART2_TXBUFSIZE=256
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CONFIG_USART2_BAUD=115200
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CONFIG_USART2_BITS=8
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CONFIG_USART2_PARITY=0
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CONFIG_USART2_2STOP=0
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3. All of these configurations are set up to build under Linux using the
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"GNU Tools for ARM Embedded Processors" that is maintained by ARM
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(unless stated otherwise in the description of the configuration).
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https://developer.arm.com/open-source/gnu-toolchain/gnu-rm
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That toolchain selection can easily be reconfigured using
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'make menuconfig'. Here are the relevant current settings:
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Build Setup:
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CONFIG_HOST_LINUX=y : Linux environment
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System Type -> Toolchain:
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CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIL=y : GNU ARM EABI toolchain
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Configuration sub-directories
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-----------------------------
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nsh:
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Configures the NuttShell (nsh) located at examples/nsh. This
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configuration is focused on low level, command-line driver testing.
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