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# The Arduino Compatible for STM32F103 Blue Pill Board
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**English** | [中文 ](README_zh.md )
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## 1 RTduino - Arduino Ecosystem Compatibility Layer for RT-Thread
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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 the board.
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### 1.1 How to Enable RTduino
Please go to the [RTduino repository ](https://github.com/RTduino/RTduino ) to see the details.
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```Kconfig
Hardware Drivers Config --->
Onboard Peripheral Drivers --->
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[*] Compatible with Arduino Ecosystem (RTduino)
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```
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## 2 Arduino Pinout
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For more information, please see [pins_arduino.c ](pins_arduino.c ) and [pins_arduino.h ](pins_arduino.h ).
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| Arduino Pin | STM32 Pin | 5V Tolerate | Note |
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| ------------------- | --------- | ----------- | ----------------------------------------------------------------------------------------------------------- |
| 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 |
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| 8 (D8, LED_BUILTIN) | PC13 | No | USER LED |
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| 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. |
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| 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 |
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| 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 |
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> Notice:
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>
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> 1. Don't use a same hardware timer to drive PWM (analogRead) and servos at same time, because hardware timer can only generate a same frequency for 4 PWM channels. Otherwise, it could cause a failure when drive servos.
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## 3 Communication
### 3.1 I2C Bus
I2C bus is `D14` and `D15` pins. Users can directly include the `#include <Wire.h>` , 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 <SPI.h>` , 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.
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### 3.3 Serial
This board supports to use `Serial.` method to operate `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 ).
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### 3.4 USB Virtual Serial
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This board supports USB virtual serial. See [example ](https://github.com/RTduino/RTduino/tree/master/examples/USBSerial ). You may enable it if is needed.
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```Kconfig
RT-Thread online packages --->
Arduino libraries --->
[*] RTduino: Arduino Ecological Compatibility Layer
[*] Enable USB Serial
```
