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 .

/media/uploads/hudakz/board01.jpg

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 /media/uploads/hudakz/mbedpi_pinout02.png

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: /media/uploads/hudakz/newproject.png

  • 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:

    /media/uploads/hudakz/addfiles.png

    /media/uploads/hudakz/addfiles02.png

  • Double click on Blinky.pro to open it for editing and add new libraries by inserting a new line as follows:

    /media/uploads/hudakz/libs.png

  • 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. /media/uploads/hudakz/mbedpi_run.png

  • Press Ctrl+c to stop running the application.

Files at this revision

API Documentation at this revision

Revision 2:131555dc6fb7, committed 16 months ago

Comitter:
hudakz
Date:
Tue Dec 20 12:16:18 2022 +0000
Parent:
1:1f2d9982fa8c
Commit message:
Mbed API for Raspberry Pi boards equipped with BCM2836 SoC.

Changed in this revision

raspi_wizard/Project.qbs Show annotated file Show diff for this revision Revisions of this file
raspi_wizard/RpiApplication.qbs Show annotated file Show diff for this revision Revisions of this file
raspi_wizard/RpiLogo.svg Show annotated file Show diff for this revision Revisions of this file
raspi_wizard/js/helpers.js Show annotated file Show diff for this revision Revisions of this file
raspi_wizard/main.cpp Show annotated file Show diff for this revision Revisions of this file
raspi_wizard/wizard.json Show annotated file Show diff for this revision Revisions of this file
rpi_wizard/qbs_rpi/Project.qbs Show diff for this revision Revisions of this file
rpi_wizard/qbs_rpi/RpiApplication.qbs Show diff for this revision Revisions of this file
rpi_wizard/qbs_rpi/RpiLogo.svg Show diff for this revision Revisions of this file
rpi_wizard/qbs_rpi/js/helpers.js Show diff for this revision Revisions of this file
rpi_wizard/qbs_rpi/main.cpp Show diff for this revision Revisions of this file
rpi_wizard/qbs_rpi/wizard.json Show diff for this revision Revisions of this file 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/raspi_wizard/Project.qbs	Tue Dec 20 12:16:18 2022 +0000
@@ -0,0 +1,14 @@
+import qbs
+import "/home/zoli/.config/QtProject/qtcreator/templates/wizards/qbs_rpi/RpiApplication.qbs" as RpiApplication
+
+RpiApplication {
+    files: [
+        "main.cpp",
+    ]
+    libs: [
+        "mbed",
+    ]
+    cpp.debugInformation: qbs.buildVariant == "debug" ? true : false
+    cpp.optimization: qbs.buildVariant == "debug" ? "none" : "small"
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/raspi_wizard/RpiApplication.qbs	Tue Dec 20 12:16:18 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"]
+}
+
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/raspi_wizard/RpiLogo.svg	Tue Dec 20 12:16:18 2022 +0000
@@ -0,0 +1,1 @@
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/raspi_wizard/js/helpers.js	Tue Dec 20 12:16:18 2022 +0000
@@ -0,0 +1,65 @@
+var Process = require("qbs.Process");
+var File = require("qbs.File");
+
+function findCommand(){
+    // check if it's unix
+    if(File.exists("/usr/bin/find")){
+        return "/usr/bin/find";
+    }
+
+    // else msys2, search unix find command
+    var where = new Process();
+    where.exec("where.exe", ['find'], true);
+    if(where.exitCode()!==0){
+        throw("error: There is a problem to detect the 'find' command."+where.exitCode());
+    }
+
+    while(true){
+        var line = where.readLine();
+        if(line!=="" && line!==undefined){
+            var findPos = line.indexOf("bin\\find.exe");
+            if (findPos > -1){
+                return line;
+            }
+        }else{
+            break;
+        }
+    }
+    where.close()
+    return "find";
+}
+
+function dirs(dir){
+    var ret = []
+    if(!File.exists(dir)){
+        return ret;
+    }
+    var find = new Process();
+    var params = [dir,'-type','d'];
+    find.exec(findCommand(), params)
+    if(find.exitCode()!==0){
+        var error = find.readStdErr();
+        throw("error: " + error)
+    }
+    var line = find.readLine();
+    while(line.trim()!==""){
+        ret = ret.concat([line.trim()]);
+        line = find.readLine();
+    }
+    find.close();
+    return(ret)
+}
+
+function getTimes() {
+    var d = new Date()
+    var current = d.getTime()/1000 // To seconds
+    var timezone = d.getTimezoneOffset()*60 // To seconds
+    var daylight = 0
+
+    return {"utc":current.toFixed(),
+        "local":(current+timezone+daylight).toFixed(),
+        "zone":timezone.toFixed(),
+        "dst":daylight.toFixed()}
+}
+
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/raspi_wizard/main.cpp	Tue Dec 20 12:16:18 2022 +0000
@@ -0,0 +1,12 @@
+#include "mbed.h"
+
+int main()
+{
+    DigitalOut  led(gpio18);
+
+    while (1) {
+        led = !led;
+        ThisThread::sleep_for(500);
+    }
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/raspi_wizard/wizard.json	Tue Dec 20 12:16:18 2022 +0000
@@ -0,0 +1,59 @@
+{
+    "version": 1,
+    "supportedProjectTypes": [ "Qbs.QbsProject" ],
+    "id": "B.Raspberry Pi",
+    "category": "A.Raspberry Pi",
+    "trDescription": "Creates an Raspberry Pi project.",
+    "trDisplayName": "Raspberry Pi project.",
+    "trDisplayCategory": "Raspberry Pi",
+    "icon": "RpiLogo.svg",
+    "enabled": "%{JS: [ %{Plugins} ].indexOf('QbsProjectManager') >= 0}",
+
+    "options":
+    [
+        { "key": "QbsFile", "value": "%{JS: Util.fileName('%{ProjectDirectory}/%{ProjectName}', 'qbs')}" },
+        { "key": "CppFileName", "value": "%{JS: 'main.' + Util.preferredSuffix('text/x-c++src')}" },
+        { "key": "InitialLibPath", "value": "/home/zoli/src/rpi/lib" }
+    ],
+
+    "pages":
+    [
+        {
+            "trDisplayName": "Project Location",
+            "trShortTitle": "Location",
+            "typeId": "Project"
+        },
+        {
+            "trDisplayName": "Kit Selection",
+            "trShortTitle": "Kits",
+            "typeId": "Kits",
+            "enabled": "%{IsTopLevelProject}",
+            "data": { "projectFilePath": "%{QbsFile}" }
+        },
+        {
+            "trDisplayName": "Project Management",
+            "trShortTitle": "Summary",
+            "typeId": "Summary"
+        }
+    ],
+    "generators":
+    [
+        {
+            "typeId": "File",
+            "data":
+            [
+                {
+                    "source": "Project.qbs",
+                    "target": "%{QbsFile}",
+                    "openAsProject": true,
+                    "condition": "%{JS: '%{BuildSystem}' === 'qbs'}"
+                },
+                {
+                    "source": "main.cpp",
+                    "target": "%{CppFileName}",
+                    "openInEditor": true
+                }
+            ]
+        }
+    ]
+}

--- a/rpi_wizard/qbs_rpi/Project.qbs	Tue Dec 20 12:08:07 2022 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,14 +0,0 @@
-import qbs
-import "/home/zoli/.config/QtProject/qtcreator/templates/wizards/qbs_rpi/RpiApplication.qbs" as RpiApplication
-
-RpiApplication {
-    files: [
-        "main.cpp",
-    ]
-    libs: [
-        "mbed",
-    ]
-    cpp.debugInformation: qbs.buildVariant == "debug" ? true : false
-    cpp.optimization: qbs.buildVariant == "debug" ? "none" : "small"
-}
-

--- a/rpi_wizard/qbs_rpi/RpiApplication.qbs	Tue Dec 20 12:08:07 2022 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,93 +0,0 @@
-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"]
-}
-
-

--- a/rpi_wizard/qbs_rpi/RpiLogo.svg	Tue Dec 20 12:08:07 2022 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-<svg width="1957" height="2500" viewBox="0 0 256 327" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMinYMin meet"><path d="M69.298.005c-1.653.051-3.433.662-5.453 2.255C58.9.353 54.102-.31 49.813 3.573c-6.623-.859-8.775.914-10.406 2.984-1.454-.03-10.879-1.495-15.202 4.953C13.343 10.225 9.91 17.899 13.8 25.056c-2.219 3.434-4.518 6.827.67 13.375-1.835 3.646-.697 7.602 3.626 12.389-1.14 5.127 1.102 8.743 5.125 11.562-.753 7.015 6.433 11.094 8.578 12.547.824 4.087 2.541 7.945 10.748 10.077 1.354 6.092 6.286 7.144 11.063 8.422-15.787 9.177-29.325 21.25-29.233 50.875l-2.313 4.125c-18.102 11.008-34.388 46.39-8.92 75.148 1.663 9.002 4.453 15.468 6.937 22.624 3.715 28.836 27.962 42.339 34.358 43.936 9.371 7.138 19.352 13.911 32.86 18.656 12.731 13.131 26.525 18.136 40.394 18.128.204 0 28.277-4.996 41.01-18.128 13.506-4.745 23.487-11.518 32.86-18.656 6.394-1.597 30.641-15.1 34.356-43.936 2.484-7.156 5.274-13.622 6.938-22.624 25.466-28.761 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\ No newline at end of file

--- a/rpi_wizard/qbs_rpi/js/helpers.js	Tue Dec 20 12:08:07 2022 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,65 +0,0 @@
-var Process = require("qbs.Process");
-var File = require("qbs.File");
-
-function findCommand(){
-    // check if it's unix
-    if(File.exists("/usr/bin/find")){
-        return "/usr/bin/find";
-    }
-
-    // else msys2, search unix find command
-    var where = new Process();
-    where.exec("where.exe", ['find'], true);
-    if(where.exitCode()!==0){
-        throw("error: There is a problem to detect the 'find' command."+where.exitCode());
-    }
-
-    while(true){
-        var line = where.readLine();
-        if(line!=="" && line!==undefined){
-            var findPos = line.indexOf("bin\\find.exe");
-            if (findPos > -1){
-                return line;
-            }
-        }else{
-            break;
-        }
-    }
-    where.close()
-    return "find";
-}
-
-function dirs(dir){
-    var ret = []
-    if(!File.exists(dir)){
-        return ret;
-    }
-    var find = new Process();
-    var params = [dir,'-type','d'];
-    find.exec(findCommand(), params)
-    if(find.exitCode()!==0){
-        var error = find.readStdErr();
-        throw("error: " + error)
-    }
-    var line = find.readLine();
-    while(line.trim()!==""){
-        ret = ret.concat([line.trim()]);
-        line = find.readLine();
-    }
-    find.close();
-    return(ret)
-}
-
-function getTimes() {
-    var d = new Date()
-    var current = d.getTime()/1000 // To seconds
-    var timezone = d.getTimezoneOffset()*60 // To seconds
-    var daylight = 0
-
-    return {"utc":current.toFixed(),
-        "local":(current+timezone+daylight).toFixed(),
-        "zone":timezone.toFixed(),
-        "dst":daylight.toFixed()}
-}
-
-

--- a/rpi_wizard/qbs_rpi/main.cpp	Tue Dec 20 12:08:07 2022 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,33 +0,0 @@
-#include "mbed.h"
-
-uint64_t    timeElapsed;
-int         i = 0;
-Timer       timer;
-
-/**
- * @brief
- * @note    None
- * @param   None
- * @retval  None
- */
-int main()
-{
-    DigitalOut  led(gpio18);
-
-    timer.reset();
-    timer.start();
-
-    while (1) {
-        //ThisThread::sleep_for(500);
-        while (1) {
-            timeElapsed = timer.read_ms();
-            if (timeElapsed > 500) {
-                timer.reset();
-                break;
-            }
-        }
-
-        led = !led;
-    }
-}
-

--- a/rpi_wizard/qbs_rpi/wizard.json	Tue Dec 20 12:08:07 2022 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,59 +0,0 @@
-{
-    "version": 1,
-    "supportedProjectTypes": [ "Qbs.QbsProject" ],
-    "id": "B.Raspberry Pi",
-    "category": "A.Raspberry Pi",
-    "trDescription": "Creates an Raspberry Pi project.",
-    "trDisplayName": "Raspberry Pi project.",
-    "trDisplayCategory": "Raspberry Pi",
-    "icon": "RpiLogo.svg",
-    "enabled": "%{JS: [ %{Plugins} ].indexOf('QbsProjectManager') >= 0}",
-
-    "options":
-    [
-        { "key": "QbsFile", "value": "%{JS: Util.fileName('%{ProjectDirectory}/%{ProjectName}', 'qbs')}" },
-        { "key": "CppFileName", "value": "%{JS: 'main.' + Util.preferredSuffix('text/x-c++src')}" },
-        { "key": "InitialLibPath", "value": "/home/zoli/src/rpi/lib" }
-    ],
-
-    "pages":
-    [
-        {
-            "trDisplayName": "Project Location",
-            "trShortTitle": "Location",
-            "typeId": "Project"
-        },
-        {
-            "trDisplayName": "Kit Selection",
-            "trShortTitle": "Kits",
-            "typeId": "Kits",
-            "enabled": "%{IsTopLevelProject}",
-            "data": { "projectFilePath": "%{QbsFile}" }
-        },
-        {
-            "trDisplayName": "Project Management",
-            "trShortTitle": "Summary",
-            "typeId": "Summary"
-        }
-    ],
-    "generators":
-    [
-        {
-            "typeId": "File",
-            "data":
-            [
-                {
-                    "source": "Project.qbs",
-                    "target": "%{QbsFile}",
-                    "openAsProject": true,
-                    "condition": "%{JS: '%{BuildSystem}' === 'qbs'}"
-                },
-                {
-                    "source": "main.cpp",
-                    "target": "%{CppFileName}",
-                    "openInEditor": true
-                }
-            ]
-        }
-    ]
-}