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Allow a bunch of Pi nodes to be visible but not active when used not on a Pi

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This commit is contained in:
Dave Conway-Jones
2018-04-15 11:24:56 +01:00
parent ace67b0154
commit acc2dc1a14
15 changed files with 428 additions and 355 deletions
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4
hardware/PiSrf/nrsrf.py
View File

@@ -31,7 +31,7 @@ def Measure():
# else:
# print("Echo start detected")
start = time.time()
GPIO.wait_for_edge(ECHO, GPIO.BOTH, timeout=400)
if channel is None:
print("Ultrasonic sensor timed out (post-echo).")
@@ -40,7 +40,7 @@ def Measure():
# else:
# print("Echo finish detected")
stop = time.time()
elapsed = stop-start
distance = (elapsed * 34300)/2 # Using speed of sound at 20C (68F)

2
hardware/PiSrf/package.json
View File

@@ -1,6 +1,6 @@
{
"name" : "node-red-node-pisrf",
"version" : "0.1.0",
"version" : "0.1.1",
"description" : "A Node-RED node for a Raspberry Pi to use a SRF04 or SRF05 range finder",
"dependencies" : {
},

120
hardware/PiSrf/pisrf.js
View File

@@ -6,20 +6,26 @@ module.exports = function(RED) {
var fs = require('fs');
var gpioCommand = __dirname + '/nrsrf.py';
var allOK = true;
if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
//util.log("Info : Ignoring Raspberry Pi specific node.");
throw "Info : Ignoring Raspberry Pi specific node.";
try {
var cpuinfo = fs.readFileSync("/proc/cpuinfo").toString();
if (cpuinfo.indexOf(": BCM") === -1) {
RED.log.warn("rpi-srf : "+RED._("node-red:rpi-gpio.errors.ignorenode"));
allOK = false;
}
else if (!fs.existsSync("/usr/share/doc/python-rpi.gpio")) {
RED.log.warn("rpi-srf : "+RED._("node-red:rpi-gpio.errors.libnotfound"));
allOK = false;
}
else if (!(1 & parseInt ((fs.statSync(gpioCommand).mode & parseInt ("777", 8)).toString (8)[0]))) {
RED.log.warn("rpi-srf : "+RED._("node-red:rpi-gpio.errors.needtobeexecutable",{command:gpioCommand}));
allOK = false;
}
}
if (!fs.existsSync("/usr/share/doc/python-rpi.gpio")) {
util.log("[rpi-srf] Info : Can't find Pi RPi.GPIO python library.");
throw "Warning : Can't find Pi RPi.GPIO python library.";
}
if (!(1 & parseInt ((fs.statSync(gpioCommand).mode & parseInt ("777", 8)).toString (8)[0]))) {
util.log("[rpi-srf] Error : " + gpioCommand + " needs to be executable.");
throw "Error : " + gpioCommand + " must to be executable.";
catch(err) {
RED.log.warn("rpi-srf : "+RED._("node-red:rpi-gpio.errors.ignorenode"));
allOK = false;
}
function PiSrfNode(n) {
@@ -29,56 +35,60 @@ module.exports = function(RED) {
this.pins += ","+(n.pulse || 0.5);
var node = this;
if (node.pins !== undefined) {
node.child = spawn(gpioCommand, [node.pins]);
node.running = true;
if (RED.settings.verbose) { node.log("parameters: " + node.pins + " :"); }
if (allOK === true) {
if (node.pins !== undefined) {
node.child = spawn(gpioCommand, [node.pins]);
node.running = true;
if (RED.settings.verbose) { node.log("parameters: " + node.pins + " :"); }
node.child.stdout.on('data', function(data) {
if (RED.settings.verbose) { node.log("out: " + data + " :"); }
data = data.toString().trim();
if (data.length > 0) {
node.send({topic:node.topic, payload:data});
node.child.stdout.on('data', function(data) {
if (RED.settings.verbose) { node.log("out: " + data + " :"); }
data = data.toString().trim();
if (data.length > 0) {
node.send({topic:node.topic, payload:data});
}
});
node.child.stderr.on('data', function(data) {
if (RED.settings.verbose) { node.log("err: " + data + " :"); }
});
node.child.on('close', function(code) {
if (RED.settings.verbose) { node.log("ret: " + code + " :"); }
node.child = null;
node.running = false;
});
node.child.on('error', function(err) {
if (err.errno === "ENOENT") { node.warn('Command not found'); }
else if (err.errno === "EACCES") { node.warn('Command not executable'); }
else { node.log('error: ' + err); }
});
}
else {
node.error("Invalid Parameters: " + node.pins);
}
var wfi = function(done) {
if (!node.running) {
if (RED.settings.verbose) { node.log("end"); }
done();
return;
}
});
setTimeout(function() { wfi(done); }, 333);
}
node.child.stderr.on('data', function(data) {
if (RED.settings.verbose) { node.log("err: " + data + " :"); }
node.on("close", function(done) {
if (node.child != null) {
node.child.kill('SIGKILL');
}
wfi(done);
});
node.child.on('close', function(code) {
if (RED.settings.verbose) { node.log("ret: " + code + " :"); }
node.child = null;
node.running = false;
});
node.child.on('error', function(err) {
if (err.errno === "ENOENT") { node.warn('Command not found'); }
else if (err.errno === "EACCES") { node.warn('Command not executable'); }
else { node.log('error: ' + err); }
});
}
else {
node.error("Invalid Parameters: " + node.pins);
node.status({fill:"grey",shape:"dot",text:"node-red:rpi-gpio.status.not-available"});
}
var wfi = function(done) {
if (!node.running) {
if (RED.settings.verbose) { node.log("end"); }
done();
return;
}
setTimeout(function() { wfi(done); }, 333);
}
node.on("close", function(done) {
if (node.child != null) {
node.child.kill('SIGKILL');
}
wfi(done);
});
}
RED.nodes.registerType("rpi-srf", PiSrfNode);
}