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121 lines
3.1 KiB
JavaScript
121 lines
3.1 KiB
JavaScript
/*
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* Author: Zion Orent <zorent@ics.com>
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* Copyright (c) 2015 Intel Corporation.
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*
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* This program and the accompanying materials are made available under the
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* terms of the The MIT License which is available at
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* https://opensource.org/licenses/MIT.
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*
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* SPDX-License-Identifier: MIT
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*/
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/************** Variables **************/
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// normal read/write mode
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var bufferLength = 256;
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var ble = require('jsupm_hm11');
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/************** Functions **************/
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function printUsage(progname)
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{
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var outputStr = "Usage: " + progname + " [AT command]\n\n" +
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"If an argument is supplied on the command line, that argument is\n" +
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"sent to the module and the response is printed out.\n\n" +
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"If no argument is used, then the address and PIN of the module\n" +
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"are queried and the results printed out.\n\n"
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console.log(outputStr);
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}
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// simple helper function to send a command and wait for a response
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function sendCommand(bleObj, cmd, callback)
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{
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var bleBuffer = new ble.charArray(bufferLength);
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bleObj.writeData(cmd, cmd.length);
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// wait up to 1 second
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if (bleObj.dataAvailable(1000))
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{
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bleObj.readData(bleBuffer, bufferLength);
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var bleData = "";
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// read only the number of characters
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// specified by myGPSSensor.readData
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for (var x = 0; x < bufferLength; x++)
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{
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if (bleBuffer.getitem(x) == '\0')
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break;
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else
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bleData += bleBuffer.getitem(x);
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}
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console.log(bleData);
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}
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else
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console.log("Timed out waiting for response");
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if (callback)
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callback();
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}
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/************** Main code **************/
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// Instantiate a HM11 BLE Module on UART 0
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var my_ble_obj = new ble.HM11(0);
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// make sure port is initialized properly. 9600 baud is the default.
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if (!my_ble_obj.setupTty(ble.int_B9600))
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{
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console.log("Failed to setup tty port parameters");
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process.exit(0);
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}
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printUsage(process.argv[1]);
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// Note: in nodeJS, command-line argument 0 is "node".
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// Command-line argument 1 is "hm11.js"
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// If you have a third argument, then it's a command for BLE
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if (process.argv.length > 2)
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{
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console.log("Sending command line argument (" + process.argv[2] + ")...");
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sendCommand(my_ble_obj, process.argv[2]);
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}
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else
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{
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// query the module address
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var addr = "AT+ADDR?";
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console.log("Querying module address (" + addr + ")...");
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// sending this command as a synchronous callback ensures better timing
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var callbackFunc = function()
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{
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setTimeout(function()
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{
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// query the module address
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var pin = "AT+PASS?";
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console.log("Querying module PIN (" + pin + ")...");
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sendCommand(my_ble_obj, pin);
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// Other potentially useful commands are:
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//
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// AT+VERS? - query module version
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// AT+ROLE0 - set as slave
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// AT+ROLE1 - set as master
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// AT+CLEAR - clear all previous settings
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// AT+RESET - restart the device
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//
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// A comprehensive list is available from the datasheet at:
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// http://www.seeedstudio.com/wiki/images/c/cd/Bluetooth4_en.pdf
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}, 1000);
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};
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sendCommand(my_ble_obj, addr, callbackFunc);
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}
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/************** Exit code **************/
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process.on('SIGINT', function()
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{
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my_ble_obj = null;
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ble.cleanUp();
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ble = null;
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console.log("Exiting...");
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process.exit(0);
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});
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