Zoltan Hudak / mbedPi

mbed API for Raspberry Pi boards.

mbedPi

This is an attempt to implement a limited number of mbed APIs for Raspberry Pi single-board computers. The project was inspired by and based on the arduPi library developed for the Arduino by Cooking Hacks .

Specifications

• Chip: Broadcom BCM2836 SoC
• Core architecture: Quad-core ARM Cortex-A7
• CPU frequency: 900 MHz
• GPU: Dual Core VideoCore IV® Multimedia Co-Processor
• Memory: 1GB LPDDR2
• Operating System: Boots from Micro SD card, running a version of the Linux operating system
• Power: Micro USB socket 5V, 2A

Connectors

• Ethernet: 10/100 BaseT Ethernet socket
• Video Output: HDMI (rev 1.3 & 1.4)
• Audio Output: 3.5mm jack, HDMI
• USB: 4 x USB 2.0 Connector
• GPIO Connector: 40-pin 2.54 mm (100 mil) expansion header: 2x20 strip providing 27 GPIO pins as well as +3.3 V, +5 V and GND supply lines
• Camera Connector: 15-pin MIPI Camera Serial Interface (CSI-2)
• JTAG: Not populated
• Display Connector: Display Serial Interface (DSI) 15 way flat flex cable connector with two data lanes and a clock lane
• Memory Card Slot: Micro SDIO

GPIO connector pinout

Zoom in

Building programs for the Raspberry Pi with mbedPi

I use Qt Creator for development, however you can use any other IDE available on the Raspberry Pi (e.g. Geany) if you like. For a quick try:

• Install Qt and the Qt Creator onto your Raspberry Pi. Then create a new "Blinky" Plain non-Qt C++ Project as follows:
  
  
• Change the main code as below:

#include "mbedPi.h"

int main()
{
    DigitalOut  myled(p7);

    while(1) {
        myled = 1; // LED is ON
        wait(0.2); // 200 ms
        myled = 0; // LED is OFF
        wait(1.0); // 1 sec
        printf("Blink\r\n");
    }
}

• Copy the mbedPi.zip file into your project's folder and unzip.
  
• Add the mbedPi.h and mbedPi.cpp files to your project by right clicking on the "Blinky" project and then clicking on the "Add Existing Files..." option in the local menu:
  
  
  
  
  
  
• Double click on Blinky.pro to open it for editing and add new libraries by inserting a new line as follows:
  
  
  
  
• Compile the project.
  
  
• Connect an LED through a 1k resistor to pin 7 and the ground on the Raspberry Pi GPIO connector.
  
  
• Run the binary as sudo (sudo ./Blinky) and you should see the LED blinking.
  
  
• Press Ctrl+c to stop running the application.

/*
 *  Copyright (C) 2016 Zoltan Hudak
 *  hudakz@outlook.com
 *
 *  Parts Copyright (C) Libelium Comunicaciones Distribuidas S.L.
 *  http://www.libelium.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  Version 1.0
 */
//

#ifndef MBEDPI_H
#define MBEDPI_H

#include "BCM2835.h"
#include "Thread.h"
#include "ThisThread.h"
#include "Peripheral.h"
#include "PinNames.h"
#include "DigitalIn.h"
#include "DigitalOut.h"
#include "DigitalInOut.h"
#include "InterruptIn.h"
#include "Serial.h"
#include "I2C.h"
#include "SPI.h"
#include "Timer.h"
#include "PwmOut.h"
#include "wait.h"

#endif // MBEDPI_H