1# The Arduino Compatible for STM32F412 Nucleo Board 2 3**English** | [中文](README_zh.md) 4 5## 1 RTduino - Arduino Ecosystem Compatibility Layer for RT-Thread 6 7STM32F412 Nucleo board has support [RTduino](https://github.com/RTduino/RTduino). Users can use Arduino APIs, third party libraries and programming method to program on the board. 8 9### 1.1 How to Enable RTduino 10 11Please go to the [RTduino repository](https://github.com/RTduino/RTduino) to see the details. 12 13```Kconfig 14Hardware Drivers Config ---> 15 Onboard Peripheral Drivers ---> 16 [*] Compatible with Arduino Ecosystem (RTduino) 17``` 18 19## 2 Arduino Pinout 20 21 22 23This board complies with Arduino UNO pins layout. For more details, please take a look at: [pins_arduino.c](pins_arduino.c) and [pins_arduino.h](pins_arduino.h). 24 25| Arduino Pin | STM32 Pin | 5V Tolerate | Note | 26| --------------------- | --------- | ----------- | --------------------------------------------------------------------------------------------- | 27| 0 (D0) | PG9 | Yes | Serial-Rx. Token over by RT-Thread UART device by default | 28| 1 (D1) | PG14 | Yes | Serial-Tx. Token over by RT-Thread UART device by default | 29| 2 (D2) | PF15 | Yes | | 30| 3 (D3) | PE13 | Yes | PWM1-CH3. Token over by RT-Thread PWM device by default | 31| 4 (D4) | PF14 | Yes | | 32| 5 (D5) | PE11 | Yes | PWM1-CH2. Token over by RT-Thread PWM device by default | 33| 6 (D6) | PE9 | Yes | PWM1-CH1. Token over by RT-Thread PWM device by default | 34| 7 (D7) | PF13 | Yes | | 35| 8 (D8) | PF12 | Yes | | 36| 9 (D9) | PD15 | Yes | PWM4-CH4. Token over by RT-Thread PWM device by default | 37| 10 (D10) | PD14 | Yes | PWM4-CH3. Token over by RT-Thread PWM device by default | 38| 11 (D11) | PA7 | Yes | PWM14-CH1. Token over by RT-Thread PWM device by default | 39| 12 (D12) | PA6 | Yes | | 40| 13 (D13) | PA5 | Yes | | 41| 14 (D14) | PB9 | Yes | I2C-SDA. Token over by RT-Thread I2C device by default | 42| 15 (D15) | PB8 | Yes | I2C-SCL. Token over by RT-Thread I2C device by default | 43| 16 (D16) | PC13 | Yes | USER Button | 44| 17 (D17, LED_BUILTIN) | PB0 | Yes | USER LED1 | 45| 18 (D18) | PB7 | Yes | USER LED2 | 46| 19 (D19) | PB14 | Yes | USER LED3 | 47| A0 | PA3 | Yes | ADC1-CH3. Token over by RT-Thread ADC device by default | 48| A1 | PC0 | Yes | ADC1-CH10. Token over by RT-Thread ADC device by default | 49| A2 | PC3 | Yes | ADC1-CH13. Token over by RT-Thread ADC device by default | 50| A3 | PC1 | Yes | ADC1-CH11. Token over by RT-Thread ADC device by default | 51| A4 | PC4 | Yes | ADC1-CH14. Token over by RT-Thread ADC device by default | 52| A5 | PC5 | Yes | ADC1-CH15. Token over by RT-Thread ADC device by default | 53| A6 | -- | | On-chip internal voltage sensor. ADC1-CH17. Token over by RT-Thread ADC device by default | 54| A7 | -- | | On-chip internal temperature sensor. ADC1-CH16. Token over by RT-Thread ADC device by default | 55 56> Notice: 57> 58> 1. Don't use a same hardware timer to drive PWM (analogRead) and servos at same time, because hardware timers can only generate a same frequency for 4 PWM channels. Otherwise, it could cause a failure when drive servos. 59 60> References 61> 62> 1. [STM32 Nucleo-144 user manual](https://www.st.com/resource/en/user_manual/um1974-stm32-nucleo144-boards-mb1137-stmicroelectronics.pdf) 63 64## 3 Communication 65 66### 3.1 I2C Bus 67 68I2C bus is `SCL/D15` and `SDA/D14` pins. Users can directly include the `#include <Wire.h>`, which is the Arduino official I2C header file, to use the I2C bus. 69 70### 3.2 SPI Bus 71 72The SPI bus of the Nucleo board is the `CS/D10`, `MOSI/D11`, `MISO/D12` and `SCK/D13` pins printed on the board. These `D11`, `D12` and `D13` pins It is taken over by the RT-Thread SPI device framework and there is no need to directly control these pins. User needs to operate `D10` chip select pin. Directly quote `#include <SPI.h>` (Arduino official SPI header file) to use. After using the SPI function, the PWM function of `D10` and `D11` will be irreversibly disabled and converted to the SPI function. 73 74### 3.3 Serial 75 76This board supports to use `Serial.` method to operate `uart3` device. See [example](https://github.com/RTduino/RTduino/blob/master/examples/Basic/helloworld.cpp). 77
