195 lines
4.1 KiB
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195 lines
4.1 KiB
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=================
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stm32f401rc-rs485
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=================
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This page discusses issues unique to NuttX configurations for the
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NuttX STM32F4-RS485 development board.
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.. figure:: stm32f401rc_rs485.jpg
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:align: center
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Board information
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=================
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This board was release on NuttX International Workshop 2023 and developed based on
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STM32F401RCT6 microcontroller.
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STM32F401RCT6 microcontroller features:
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- Arm 32-bit Cortex®-M4 CPU with FPU
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- 128 Kbytes of Flash memory
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- 64 Kbytes of SRAM
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- Serial wire debug (SWD) & JTAG interfaces
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- Up to 81 I/O ports with interrupt capability
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- Up to 11 communication interfaces
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- Up to 3 I2C interfaces
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- Up to 3 USARTs
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- Up to 4 SPIs
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- SDIO interface
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- USB 2.0 full-speed device/host/OTG controller with on-chip PHY
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The board features:
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- Digital I2C Temperature Sensor (TMP75)
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- 2K bits (256x8) I2C EEPROM
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- On-board RS485 Transceiver
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- Two Analog Input Stages with Amplifier Buffer
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- Two Analog Output Stages with Amplifier Buffer
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- MicroSD Connector supporting 1 or 4-bit bus
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- Four User LEDs
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- Four User Buttons
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- USB for DFU (Device Firmware Update) and USB device functionality, as well as powering the board
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- Onboard voltage regulator from 5V to 3.3V
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- SWD Pins for use as STLink (Pin header) and TC2030-IDC 6-Pin Tag-Connect Plug-of-Nails™ Connector
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- Crystal for HS 8MHz
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- Crystal for RTC 32.768KHz
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Board documentation:
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https://github.com/lucaszampar/NuttX_STM32F4_RS485_DevBoard
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As F4 series have a USB DFuSe-capable BootROM [AN2606], the board can be flashed
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via `dfu-util` over USB, or via `stm32flash` over UART without any debuggers.
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LEDs
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====
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The STM32F4-RS485 has 4 software controllable LEDs.
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===== =====
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LED PINS
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===== =====
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LED_1 PC0
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LED_2 PC1
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LED_4 PC2
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LED_5 PC3
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===== =====
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User Buttons
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============
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The STM32F4-RS485 has 4 user switches.
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======= =====
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SWITCH PINS
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====== =====
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SWIO_1 PB13
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SWIO_2 PB14
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SWIO_3 PB15
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SWIO_4 PC6
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====== =====
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UARTs
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=====
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The STM32F4-RS485 has 1 USART available for user.
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USART2
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------
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========== =====
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UART/USART PINS
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========== =====
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CTS PA0
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RTS PA1
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TX PA2 *Warning you make need to reverse RX/TX on
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RX PA3 some RS-232 converters
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CK PA4
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========== =====
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SDCARD
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=====
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The STM32F4-RS485 has 1 SDCard slot connected as below:
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========== =====
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SDIO PINS
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========== =====
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SDIO_D0 PC8
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SDIO_D1 PC9
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SDIO_D2 PC10
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SDIO_D3 PC11
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SDIO_DK PC12
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========== =====
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EEPROM
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======
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The STM32F4-RS485 development board has serial EEPROM HX24LC02B, with 2k bits (256x8) and internally
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organized with 32 pages of 8 bytes each. It is connected through I2C as below:
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====== =====
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I2C PINS
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====== =====
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SDA PB7
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SCL PB8
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====== =====
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Temperature Sensor
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==================
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The STM32F4-RS485 development board has a temperature sensor TMP75 (TMP75AIDR) connected through I2C as below:
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====== =====
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I2C PINS
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====== =====
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SDA PB7
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SCL PB8
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====== =====
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RS485 Transceiver
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=====
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The STM32F4-RS485 development board has a half-duplex RS-485 transceiver, the BL3085B it is connected
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through USART2 as below:
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========== =====
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USART2 PINS
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========== =====
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USART2_RX RO
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USART2_RTS DE, /RE
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USART2_RX DI
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========== =====
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A/D Converter
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=====
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The STM32F4-RS485 development board has two Analog to Digital converters with Amplifier Buffer (1COS724SR)
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and connected as below:
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======= =====
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PWM PINS
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======= =====
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PWM_1 PB6
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PWM_2 PA6
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======= =====
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D/C Converter
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=====
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The STM32F4-RS485 development board has two Digital to Analog converters with Amplifier Buffer (1COS724SR)
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and connected as below:
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======= =====
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ADC PINS
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======= =====
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ADC_1 PA0
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ADC_2 PA4
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======= =====
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Configurations
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==============
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Each stm32f401rc-rs485 configuration is maintained in a sub-directory and
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can be selected as follow::
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tools/configure.sh stm32f401rc-rs485:<subdir>
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Where <subdir> is one of the following:
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Configuration Directories
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-------------------------
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nsh
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---
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Configures the NuttShell (nsh) located at apps/examples/nsh. This
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configuration enables a serial console on UART2.
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