

M3 Hardware UART1 connects to RX1/TX1 and Bluetooth communications port



SCL/SDA is a default internal IIC interface, compatible with Arduino IIC use-pattern



"~": PWM: pins with this mark can output a PWM signal (refer to PWM chapter for more

information)



"Ax": Analog input pins (note: some analog pins and digital pins are using the same GPIO)



"SWD": STM32 debug port



For pin definitions and functions refer to the MORE section: Bluno M3 Reference manual ——

GPIO

https://www.dfrobot.com/wiki/index.php/Bluno_M3_Reference_Manual#GPIO

Bluno M3 Features

Differences between Bluno M3 and Arduino

1. Overview

The Bluno M3 is different to previous Bluno boards as it is based on a 32bit ARM Cortex-M3

core architecture. A regular Arduino is based on an 8bit AVR core. Due to these differences,

machine commands are also different. Arduino IDE uses avr-gcc, whilst Bluno M3 uses arm-

none-eabi-gcc.

2. Hardware Ports



ADC: Pins marked with "Ax" (e.g. A0, A6, A10) can be used as Analog input ports



Uart: 5 Serial Ports in all (Serial1/Serial2/Serial3/Serial4/Serial5). Bluetooth and RX1/TX1 use

Serial1



SWD: STM32 debug port, you can use debug hardware based on STM32 on these pins



GPIO: All pins can be used as digital I/O, including analog pins

3. Language and Library Software Differences



ADC: Bluno M3 provides two kinds of ADC mode: one is compatible with Arduino, the other is

Bluno M3's unique way: adcMode() and adcRead(), which makes it more powerful. Refer to

Bluno M3 Bluno M3 Reference manual —— ADC ADC Application.



PWM: Bluno M3 provides two kinds of PWM mode, one is compatible with Arduino, the other is

Bluno M3's unique way: pwmMode() and pwmWrite(),which makes it more powerful. Please

refer to Bluno M3 Bluno M3 Reference manual —— PWM PWM Application.



UART: There are 5 UARTs on the board. UART1 is corresponds to the Board RX1 and TX1, and

it is also connected with the Bluetooth communicating port.

4. Bluno M3 Reference

This section introduces basic information, methods of application, function interfaces and uses.

e.g. GPIO, PWM, UART, SPI, I2C, etc. For the further information, please check

Bluno M3

Reference Manual

https://www.dfrobot.com/wiki/index.php/Bluno_M3_Reference_Manual