Zoltan Hudak
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/wizard.json
- Revision:
- 2:131555dc6fb7
- Parent:
- 1:1f2d9982fa8c
--- 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
- }
- ]
- }
- ]
-}