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
Information
Only the labels printed in blue/white or green/white (i.e. p3, gpio2 ...) must be used in your code. The other labels are given as information (alternate-functions, power pins, ...).
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:
main.cpp
#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.
Diff: rpi_wizard/qbs_rpi/RpiApplication.qbs
- Revision:
- 1:1f2d9982fa8c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/rpi_wizard/qbs_rpi/RpiApplication.qbs Tue Dec 20 12:08:07 2022 +0000 @@ -0,0 +1,93 @@ +import qbs +import qbs.Process +import qbs.File +import qbs.FileInfo +import qbs.TextFile +import "/home/zoli/.config/QtProject/qtcreator/templates/wizards/qbs_rpi/js/helpers.js" as helpers + +CppApplication { + type: "application" + consoleApplication: true + Depends { name: "cpp" } +// cpp.cppFlags: "-std=c++11" +// Depends { +// name: "Qt"; +// submodules: ["core", "gui", "widgets"] +// } + + Group { + fileTagsFilter: product.type + qbs.install: true + qbs.installDir: "bin" + qbs.installPrefix: "/mnt/workbench" + } + + property string sysPath: "/home/zoli/src/rpi/sys" + property stringList sys: [ + "drivers", + ] + property pathList sysPaths: { + var l = [] + for (var i = 0; i < sys.length; i++) { + l = l.concat(helpers.dirs(sysPath+"/"+sys[i])) + } + return l + } + + Group { + name: "sys" + condition: (sysPath != "") + files: { + var l = [] + for (var i = 0; i < sys.length; i++) { +// l = l.concat(sys[i]+"/**") + l = l.concat(sys[i]+"/**/*.cpp") + l = l.concat(sys[i]+"/**/*.c") + l = l.concat(sys[i]+"/**/*.hpp") + l = l.concat(sys[i]+"/**/*.h") + l = l.concat(sys[i]+"/**/*.s") + } + return l + } + prefix: sysPath + "/" + } + + property string libPath: "/home/zoli/src/rpi/lib" + property stringList libs: [] + property pathList libPaths: { + var l = [] + for (var i = 0; i < libs.length; i++) { + l = l.concat(helpers.dirs(libPath+"/"+libs[i])) + } + return l + } + + Group { + name: "libs" + condition: (libPath != "") + files: { + var l = [] + for (var i = 0; i < libs.length; i++) { +// l = l.concat(libs[i]+"/**") + l = l.concat(libs[i]+"/**/*.cpp") + l = l.concat(libs[i]+"/**/*.c") + l = l.concat(libs[i]+"/**/*.hpp") + l = l.concat(libs[i]+"/**/*.h") + l = l.concat(libs[i]+"/**/*.s") + } + return l + } + prefix: libPath + "/" + } + + property pathList includePaths: "" + + cpp.compilerIncludePaths: "/home/zoli/toolchain/rpi/arm-bcm2708/arm-bcm2708-linux-gnueabi/arm-bcm2708-linux-gnueabi/include/c++/4.7.1" + cpp.compilerFrameworkPaths: "/home/zoli/toolchain/rpi/arm-bcm2708/arm-bcm2708-linux-gnueabi/bin/" + cpp.compilerLibraryPaths: "/home/zoli/toolchain/rpi/arm-bcm2708/arm-bcm2708-linux-gnueabi/arm-bcm2708-linux-gnueabi/lib" + cpp.includePaths: includePaths.concat("/.", sysPaths, libPath) + //cpp.staticLibraries: ["mbed"] + cpp.dynamicLibraries: ["rt", "pthread"] +} + +