# The Arduino Compatible of STM32 Blue Pill Board **English** | [中文](README_zh.md) ## 1 RTduino - Arduino Ecosystem Compatibility Layer for RT-Thread STM32 Blue Pill board has support [RTduino](https://github.com/RTduino/RTduino). Users can use Arduino APIs, third party libraries and programming method to program on Blue Pill board. ### 1.1 How to Enable RTduino Please go to the [RTduino repository](https://github.com/RTduino/RTduino) to see the details. ```Kconfig Hardware Drivers Config ---> Onboard Peripheral Drivers ---> [*] Support Arduino ``` ## 2 Arduino Pinout ![blue-pill-f103-pinout](blue-pill-f103-pinout.jpg) | Arduino Pin | STM32 Pin | 5V Tolerate | 备注 | | ------------------- | --------- | ----------- | ----------------------------------------------------------------------------------------------------------- | | 0 (D0) | PB7 | Yes | | | 1 (D1) | PB6 | Yes | | | 2 (D2) | PB5 | No | PWM3-CH2. Token over by RT-Thread PWM device by default | | 3 (D3) | PB4 | Yes | PWM3-CH1. Token over by RT-Thread PWM device by default | | 4 (D4) | PB3 | Yes | PWM2-CH2. Token over by RT-Thread PWM device by default | | 5 (D5) | PA15 | Yes | PWM2-CH1. Token over by RT-Thread PWM device by default | | 6 (D6) | PA8 | Yes | | | 7 (D7, SS) | PB12 | Yes | SPI chip select by default | | 8 (D8, LED_BUILTIN) | PC13 | No | Build-in LED | | 9 (D9) | PC14 | No | | | 10 (D10) | PC15 | No | | | 11 (D11) | PA0 | No | | | 12 (D12) | PB0 | No | PWM3-CH3. Token over by RT-Thread PWM device by default | | 13 (D13) | PB1 | No | PWM3-CH4. Token over by RT-Thread PWM device by default | | 14 (D14) | PB9 | Yes | I2C-SDA. Token over by RT-Thread I2C device by default | | 15 (D15) | PB8 | Yes | I2C-SCL. Token over by RT-Thread I2C device by default | | 16 (D16) | PA12 | Yes | USB-DP. Token over by [TinyUSB](https://github.com/RT-Thread-packages/tinyusb) software package by default. | | 17 (D17) | PA11 | Yes | USB-DM. Token over by [TinyUSB](https://github.com/RT-Thread-packages/tinyusb) software package by default. | | 18 (D18) | PA10 | Yes | Serial-Rx. Token over by RT-Thread UART device by default | | 19 (D19) | PA9 | Yes | Serial-Tx. Token over by RT-Thread UART device by default | | 20 (D20) | PA2 | No | Serial2-Tx. Token over by RT-Thread UART device by default | | 21 (D21) | PA3 | No | Serial2-Rx. Token over by RT-Thread UART device by default | | 22 (D22) | PB10 | Yes | Serial3-Tx. Token over by RT-Thread UART device by default | | 23 (D23) | PB11 | Yes | Serial3-Rx. Token over by RT-Thread UART device by default | | 24 (D24) | PB15 | Yes | SPI-MOSI. Token over by RT-Thread SPI device by default | | 25 (D25) | PB14 | Yes | SPI-MISO. Token over by RT-Thread SPI device by default | | 26 (D26) | PB13 | Yes | SPI-SCK. Token over by RT-Thread SPI device by default | | 27 (A0) | PA1 | No | ADC1-CH1. Token over by RT-Thread ADC device by default | | 28 (A1) | PA4 | No | ADC1-CH4. Token over by RT-Thread ADC device by default | | 29 (A2) | PA5 | No | ADC1-CH5. Token over by RT-Thread ADC device by default | | 30 (A3) | PA6 | No | ADC1-CH6. Token over by RT-Thread ADC device by default | | 31 (A4) | PA7 | No | ADC1-CH7. Token over by RT-Thread ADC device by default | | 32 (A5) | -- | | ADC of chip internal reference voltage. Token over by RT-Thread ADC device by default | | 33 (A6) | -- | | ADC of chip internal temperature. Token over by RT-Thread ADC device by default | > Note: > > 1. If you drive the servo and call the analogWrite function at the same time, you need to select the PWM signal pins generated by different timers. Since the 4 channels of the STM32 timer need to maintain the same frequency, if the PWM generated by the same timer is used to drive the servo and analogWrite respectively , it may cause the servo to fail. > 2. More information about Arduino pinout, please see [pins_arduino.c](pins_arduino.c) and [pins_arduino.h](pins_arduino.h) ## 3 Communication ### 3.1 I2C Bus I2C bus is `D14` and `D15` pins. Users can directly include the `#include `, which is the Arduino official I2C header file, to use the I2C bus. ### 3.2 SPI Bus SPI bus is `D24`, `D25` and `D26` pins. Users can directly include the `#include `, which is the Arduino official SPI header file, to use the SPI bus. In addition, chip select pin (SS) also is used, which is `D7` by default. ### 3.3 USB This board supports USB virtual COM by default. See [example](https://github.com/RTduino/RTduino/tree/master/examples/USBSerial). ### 3.4 Serial This board supports to use `Serail.` method to use `uart1` device; use `Serial2.` method to use `uart2` device; use `Serial3.` method to use `uart3` device. See [example](https://github.com/RTduino/RTduino/blob/master/examples/Basic/helloworld.cpp).