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Add Hummingboard GPIO node

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Dave C-J 2014-12-10 09:29:18 +00:00
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node-red-node-hbgpio
====================
A <a href="http://nodered.org" target="_new">Node-RED</a> node to read and write the digital IO of a SolidRun HummingBoard.
Install
-------
Run the following command in the root directory of your Node-RED install:
npm install node-red-node-hpgpio
**Note :** This **should** be run as root in order to move and set SUID permissions on a script to talk to the gpio pins. Alternatively you can run as a normal user and then move the file and change permissions manually.
sudo cp node_modules/node-red-node-hpgpio/gpiohb /usr/local/bin/
sudo chmod 4755 /usr/lcoal/bin/gpiohb
Usage
-----
Hummingboard GPIO input and output nodes.
This requires a small script (gpiohb) to run as root in order to work. It should be placed in /usr/local/bin/ and have SUID permissions 4755.
**Note:** We are using the actual physical pin numbers as they are easier to locate.
###Output node
Expects a <b>msg.payload</b> with either a 0 or 1 (or true or false).
Will set the selected physical pin high or low depending on the value passed in.
The initial value of the pin at deploy time can also be set to 0 or 1.
###Input node
Generates a **msg.payload** with either a 0 or 1 depending on the state of the input pin.
The **msg.topic** is set to **pin/{the pin number}**
**Note:** The input node waits for a change on the level of the pin before reading the value - and then resets to wait for the next interrupt - so it is possible to miss very fast changes as we may still be reading the value when the second edge occurs.

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hardware/HummingboardGPIO/fixup.sh Executable file
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#!/bin/bash
echo "*********************************************"
echo "Moving gpiohb to /usr/local/bin/"
if [[ $EUID -ne 0 ]]; then
echo "Not running as user root" 2>&1
echo "please run the following commands manually"
echo " sudo cp $PWD/gpiohb /usr/local/bin/gpiohb"
echo " sudo chmod 4755 /usr/local/bin/gpiohb"
echo "or re-run npm install as root / sudo"
echo "*********************************************"
exit 1
else
cp gpiohb /usr/local/bin/
chmod 4755 /usr/local/bin/gpiohb
echo "OK - gpiohb moved to /usr/local/bin"
echo "*********************************************"
fi

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hardware/HummingboardGPIO/gpiohb Executable file
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#!/bin/bash
# There is NO error checking in this program - you can mess up pins big time if you want.
# gpio mode pin inputtype
# gpio read pin
# gpio write pin level
# gpio pwm pin level
# gpio close pin
declare -A pins
# Map the GPIO names to actual underlying IO numbers
pins=(["0"]="73" ["1"]="72" ["2"]="71" ["3"]="70" ["4"]="194" ["5"]="195" ["6"]="67" ["7"]="1")
usage() {
echo ""
echo " gpiohb mode {pin} {in|out}"
echo " gpiohb read {pin}"
echo " gpiohb write {pin} {0|1}"
echo " gpiohb wfi {pin} {rising|falling|both|none}"
#echo " gpiohb pwm {pin} {0-1023}"
echo " gpiohb close {pin}"
echo ""
}
while [ "$1" != "" ]; do
case $1 in
-h | --help | -?)
usage
exit
;;
mode)
echo $1 $2 $3
if [ "$3" != "out" ] ; then
$3="in"
fi
pin=${pins[$2]}
echo $pin > /sys/class/gpio/export
echo $3 > /sys/class/gpio/gpio$pin/direction
exit
;;
read)
pin=${pins[$2]}
cat /sys/class/gpio/gpio$pin/value
exit
;;
write)
pin=${pins[$2]}
echo $3 > /sys/class/gpio/gpio$pin/value
exit
;;
wfi)
pin=${pins[$2]}
echo $3 > /sys/class/gpio/gpio$pin/edge
exit
;;
pwm)
# Not implemented yet....
pin=${pins[$2]}
exit
;;
close)
pin=${pins[$2]}
echo $pin > /sys/class/gpio/unexport
exit
;;
*)
echo "ERROR: unknown parameter \"$PARAM\""
usage
exit 1
;;
esac
shift
done

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hardware/HummingboardGPIO/hb-gpio.html Normal file
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<!--
Copyright 2014 IBM Corp.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<script type="text/x-red" data-template-name="hb-gpio in">
<div class="form-row">
<label for="node-input-pin"><i class="fa fa-circle"></i> GPIO Pin</label>
<select type="text" id="node-input-pin" style="width: 250px;">
<option value='' disabled selected style='display:none;'>select pin</option>
<option value="7">7 - GPIO 1</option>
<option value="11">11 - GPIO 73</option>
<option value="12">12 - GPIO 72</option>
<option value="13">13 - GPIO 71</option>
<option value="15">15 - GPIO 10</option>
<option value="16">16 - GPIO 194</option>
<option value="18">18 - GPIO 195</option>
<option value="22">22 - GPIO 87</option>
</select>
&nbsp;<span id="pitype"></span>
</div>
<!-- <div class="form-row">
<label for="node-input-intype"><i class="fa fa-level-up"></i> Resistor ?</label>
<select type="text" id="node-input-intype" style="width: 150px;">
<option value="tri">none</option>
<option value="up">pullup</option>
<option value="down">pulldown</option>
</select>
</div> -->
<div class="form-row">
<label>&nbsp;</label>
<input type="checkbox" id="node-input-read" style="display: inline-block; width: auto; vertical-align: top;">
<label for="node-input-read" style="width: 70%;">Read initial state of pin on deploy/restart ?</label>
</div>
<br/>
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
<div class="form-tips">Tip: Only Digital Input is supported - input must be 0 or 1.</div>
</script>
<script type="text/x-red" data-help-name="hb-gpio in">
<p>Hummingboard GPIO input pin node. Generates a <b>msg.payload</b> with either a 0 or 1 depending on the state of the input pin.</p>
<p>You may also enable the input pullup resitor or the pulldown resistor.</p>
<p>The <b>msg.topic</b> is set to <i>pi/{the pin number}</i></p>
<p><b>Note:</b> we are using the actual physical pin numbers on connector P1 as they are easier to locate.</p>
<p><b>Note:</b> requires the gpiohb command to be executeable as root in order to work.</p>
</script>
<script type="text/javascript">
RED.nodes.registerType('hb-gpio in',{
category: 'Hummingboard',
color:"#c6dbef",
defaults: {
name: { value:"" },
pin: { value:"",required:true,validate:RED.validators.number() },
intype: { value: "in" },
read: { value:false }
},
inputs:0,
outputs:1,
icon: "arrow.png",
label: function() {
return this.name||"Pin: "+this.pin ;
},
labelStyle: function() {
return this.name?"node_label_italic":"";
}
});
</script>
<script type="text/x-red" data-template-name="hb-gpio out">
<div class="form-row">
<label for="node-input-pin"><i class="fa fa-circle"></i> GPIO Pin</label>
<select type="text" id="node-input-pin" style="width: 250px;">
<option value='' disabled selected style='display:none;'>select pin</option>
<option value="7">7 - GPIO 1</option>
<option value="11">11 - GPIO 73</option>
<option value="12">12 - GPIO 72</option>
<option value="13">13 - GPIO 71</option>
<option value="15">15 - GPIO 10</option>
<option value="16">16 - GPIO 194</option>
<option value="18">18 - GPIO 195</option>
<option value="22">22 - GPIO 87</option>
</select>
&nbsp;<span id="pitype"></span>
</div>
<div class="form-row" id="node-set-tick">
<label>&nbsp;</label>
<input type="checkbox" id="node-input-set" style="display: inline-block; width: auto; vertical-align: top;">
<label for="node-input-set" style="width: 70%;">Initialise pin state ?</label>
</div>
<div class="form-row" id="node-set-state">
<label for="node-input-level">&nbsp;</label>
<select id="node-input-level" style="width: 250px;">
<option value="0">initial level of pin - low (0)</option>
<option value="1">initial level of pin - high (1)</option>
</select>
</div>
<br/>
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
<div class="form-tips" id="dig-tip"><b>Tip</b>: For digital output - input must be 0 or 1.</div>
<!-- <div class="form-tips" id="pwm-tip"><b>Tip</b>: For PWM output - input must be between 0 to 1023.</div> -->
</script>
<script type="text/x-red" data-help-name="hb-gpio out">
<p>Hummingboard GPIO output pin node. Expects a <b>msg.payload</b> with either a 0 or 1 (or true or false).</p>
<p>Will set the selected physical pin high or low depending on the value passed in.</p>
<p>The initial value of the pin at deploy time can also be set to 0 or 1.</p>
<p><b>Note:</b> we are using the actual physical pin numbers as they are easier to locate.</p>
<p><b>Note:</b> requires the gpiohb command to be executeable as root in order to work.</p>
</script>
<script type="text/javascript">
RED.nodes.registerType('hb-gpio out',{
category: 'Hummingboard',
color:"#c6dbef",
defaults: {
name: { value:"" },
pin: { value:"",required:true,validate:RED.validators.number() },
set: { value:"" },
level: { value:"0" }
},
inputs:1,
outputs:0,
icon: "arrow.png",
align: "right",
label: function() {
return this.name||"Pin: "+this.pin ;
},
labelStyle: function() {
return this.name?"node_label_italic":"";
},
oneditprepare: function() {
var setstate = function () {
if ($('#node-input-set').is(":checked")) {
$("#node-set-state").show();
} else {
$("#node-set-state").hide();
}
};
$("#node-input-set").change(function () { setstate(); });
setstate();
}
});
</script>

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hardware/HummingboardGPIO/hb-gpio.js Normal file
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/**
* Copyright 2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
module.exports = function(RED) {
"use strict";
var exec = require('child_process').exec;
var fs = require('fs');
var gpioCommand = '/usr/local/bin/gpiohb';
//if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
//throw "Info : Ignoring Raspberry Pi specific node.";
//}
if (!fs.existsSync(gpioCommand)) { // gpio command not installed
throw "Info : Can't find "+gpioCommand+" command.";
}
// Map physical P1 pins to Gordon's Wiring-Pi Pins (as they should be V1/V2 tolerant)
var pintable = {
// Physical : WiringPi
"11":"0",
"12":"1",
"13":"2",
"15":"3",
"16":"4",
"18":"5",
"22":"6",
"7":"7",
"3":"8",
"5":"9",
"24":"10",
"26":"11",
"19":"12",
"21":"13",
"23":"14",
"8":"15",
"10":"16",
"27":"30",
"28":"31",
"29":"21",
"31":"22",
"32":"26",
"33":"23",
"35":"24",
"36":"27",
"37":"25",
"38":"28",
"40":"29"
}
var tablepin = {
// WiringPi : Physical
"0":"11",
"1":"12",
"2":"13",
"3":"15",
"4":"16",
"5":"18",
"6":"22",
"7":"7",
"8":"3",
"9":"5",
"10":"24",
"11":"26",
"12":"19",
"13":"21",
"14":"23",
"15":"8",
"16":"10",
"30":"27",
"31":"28",
"21":"29",
"22":"31",
"26":"32",
"23":"33",
"24":"35",
"27":"36",
"25":"37",
"28":"38",
"29":"40"
}
function GPIOHBInNode(n) {
RED.nodes.createNode(this,n);
this.buttonState = -1;
this.pin = pintable[n.pin];
this.intype = n.intype;
this.read = n.read || false;
if (this.read) { this.buttonState = -2; }
var node = this;
var readit = function() {
exec(gpioCommand+" read "+node.pin, function(err,stdout,stderr) {
if (err) { node.error(err); }
else {
exec(gpioCommand+" wfi "+node.pin + " both", function(err,stdo,stde) {
if (err) { node.error(err); }
else { readit(); }
});
if (node.buttonState !== Number(stdout)) {
var previousState = node.buttonState;
node.buttonState = Number(stdout);
if (previousState !== -1) {
var msg = {topic:"pi/"+tablepin[node.pin], payload:(node.buttonState === 0 ? 0 : 1)};
node.send(msg);
}
}
}
});
}
if (node.pin !== undefined) {
exec(gpioCommand+" mode "+node.pin+" "+node.intype, function(err,stdout,stderr) {
if (err) { node.error(err); }
else {
readit();
}
});
}
else {
node.error("Invalid GPIO pin: "+node.pin);
}
node.on("close", function() {
clearInterval(node._interval);
exec(gpioCommand+" close "+node.pin);
});
}
function GPIOHBOutNode(n) {
RED.nodes.createNode(this,n);
this.pin = pintable[n.pin];
this.set = n.set || false;
this.level = n.level || 0;
this.out = n.out || "out";
var node = this;
(node.out === "pwm") ? (node.op = "pwm") : (node.op = "write");
if (node.pin !== undefined) {
exec(gpioCommand+" mode "+node.pin+" "+node.out, function(err,stdout,stderr) {
if (err) { node.error(err); }
else {
if (node.set && (node.out === "out")) {
exec(gpioCommand+" write "+node.pin+" "+node.level, function(err,stdout,stderr) {
if (err) { node.error(err); }
});
}
node.on("input", function(msg) {
if (msg.payload === "true") { msg.payload = true; }
if (msg.payload === "false") { msg.payload = false; }
var out = Number(msg.payload);
var limit = 1;
if (node.out === "pwm") { limit = 1023; }
if ((out >= 0) && (out <= limit)) {
exec(gpioCommand+" "+node.op+" "+node.pin+" "+out, function(err,stdout,stderr) {
if (err) { node.error(err); }
});
}
else { node.warn("Invalid input: "+out); }
});
}
});
}
else {
node.error("Invalid GPIO pin: "+node.pin);
}
node.on("close", function() {
exec(gpioCommand+" close "+node.pin);
});
}
RED.nodes.registerType("hb-gpio in",GPIOHBInNode);
RED.nodes.registerType("hb-gpio out",GPIOHBOutNode);
}

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hardware/HummingboardGPIO/package.json Normal file
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{
"name" : "node-red-node-hbgpio",
"version" : "0.0.1",
"description" : "A Node-RED node for the GPIO of the Hummingboard",
"dependencies": {
},
"repository" : {
"type":"tgz",
"url":"http://dcj.dtdns.net/npms/hbgpio.tgz"
},
"license": "Apache-2.0",
"keywords": [ "node-red", "hummingboard", "gpio" ],
"node-red" : {
"nodes": {
"hb-gpio": "hb-gpio.js"
}
},
"scripts": {
"postinstall": "./fixup.sh"
},
"author": {
"name": "Dave Conway-Jones",
"email": "ceejay@vnet.ibm.com",
"url": "http://nodered.org"
}
}