mirror of https://github.com/espruino/BangleApps
added gpssetup app
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0.01: First version of GPS Setup app
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# GPS Setup
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An App to enable the GPS to be configured into low power mode.
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## Goals
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To develop app that sets the GPS up to run with the lowest possible
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power consumption.
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* An app that turns on the GPS and constantly displays the screen
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will use around 75mA, the battery will last between 3-4 hours.
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* Using the GPS in a Widget in Super-E Power Saving Mode (PSM) with
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the screen off most of the time, will consume around 35mA and you
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might get 10hrs before a recharge.
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* Using the GPS in Power Saving Mode On/Off (PSMOO) with suitable
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settings can reduce the average consumption to around 15mA. A
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simple test using a 120s update period, 6s search period was still
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running with 45% battery 20 hours after it started.
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## Settings
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The Settings App enables you set the options below for the GPS.
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Either start the App from the launcher or go to Settings, select
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App/Widgets and then 'GPS Setup'.
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When you exit the setup App the settings will be stored in the
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gpssetup.settings.json file; the GPS will be switched on and the
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necessary commands sent to the GPS to configure it. The GPS is then
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powered off. The GPS configuration is stored in the GPS non-volatile
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memory so that next time the GPS is powered on they are used. These
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settings will remain and impact every app that uses the GPS.
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- Power Mode:
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- SuperE - the factory default setup for the GPS. The recommended
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power saving mode.
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- PSMOO - On/Off power saving mode. Configured by interval and
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search time. Choose this mode if you are happy to get a GPS
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position update less often (say every 1 or 2 minutes). The longer
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the interval the more time the GPS will spend sleeping in low
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power mode (7mA) between obtaining fixes (35mA). For walking in
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open country an update once every 60 seconds is adequate to put
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you within a 6 digit grid refernce sqaure.
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- update - the time between two position fix attempts.
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- search - the time between two acquisition attempts if the receiver
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is unable to get a position fix.
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## References
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* [UBLOX M8 Receiver Data Sheet](https://www.u-blox.com/sites/default/files/products/documents/u-blox8-M8_ReceiverDescrProtSpec_%28UBX-13003221%29.pdf)
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* [UBLOX Power Management App Note](https://www.u-blox.com/sites/default/files/products/documents/PowerManagement_AppNote_%28UBX-13005162%29.pdf)
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* Some useful code on Github and be found [here](https://portal.u-blox.com/s/question/0D52p0000925T00CAE/ublox-max-m8q-getting-stuck-when-sleeping-with-extint-pin-control)
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and [here](https://github.com/thasti/utrak/blob/master/gps.c)
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Bangle.loadWidgets();
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Bangle.drawWidgets();
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const SETTINGS_FILE = "gpssetup.settings.json";
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let settings = undefined;
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let settings_changed = false;
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function updateSettings() {
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require("Storage").write(SETTINGS_FILE, settings);
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settings_changed = true;
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}
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function loadSettings() {
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log_debug("loadSettings()");
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settings = require("Storage").readJSON(SETTINGS_FILE,1)||{};
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settings.update = settings.update||120;
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settings.search = settings.search||5;
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settings.power_mode = settings.power_mode||"SuperE";
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log_debug(settings);
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}
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/*********** GPS Power and Setup Functions ******************/
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function log_debug(o) {
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//console.log(o);
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}
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// quick hack
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function wait(ms){
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var start = new Date().getTime();
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var end = start;
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while(end < start + ms) {
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end = new Date().getTime();
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}
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}
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function setupGPS() {
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Bangle.setGPSPower(1);
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if (settings.power_mode === "PSMOO") {
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setupPSMOO();
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} else {
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setupSuperE();
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}
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log_debug("Powering GPS Off");
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Bangle.setGPSPower(0);
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}
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function setupPSMOO() {
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log_debug("setupGPS() PSMOO");
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UBX_CFG_RESET();
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wait(100);
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UBX_CFG_PM2(settings.update, settings.search);
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wait(20);
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UBX_CFG_RXM();
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wait(20);
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UBX_CFG_SAVE();
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wait(20);
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}
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function setupSuperE() {
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log_debug("setupGPS() Super-E");
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UBX_CFG_RESET();
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wait(100);
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UBX_CFG_PMS();
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wait(20);
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UBX_CFG_SAVE();
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wait(20);
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}
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function writeGPScmd(cmd) {
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var d = [0xB5,0x62]; // sync chars
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d = d.concat(cmd);
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var a=0,b=0;
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for (var i=2;i<d.length;i++) {
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a += d[i];
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b += a;
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}
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d.push(a&255,b&255);
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Serial1.write(d);
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}
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// UBX-CFG-PMS - enable power management - Super-E
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function UBX_CFG_PMS() {
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writeGPScmd([0x06,0x86, // msg class + type
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8,0,//length
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0x00,0x03, 0,0, 0,0, 0,0]);
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}
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// convert an integer to an array of bytes
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function int_2_bytes( x ){
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var bytes = [];
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var i = 4;
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do {
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bytes[--i] = x & (255);
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x = x>>8;
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} while (i);
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return bytes;
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}
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/*
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* Extended Power Management
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* update and search are in milli seconds
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* settings are loaded little endian, lsb first
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*
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* https://github.com/thasti/utrak/blob/master/gps.c
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*/
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function UBX_CFG_PM2(update,search) {
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var u = int_2_bytes(update*1000);
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var s = int_2_bytes(search*1000);
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writeGPScmd([0x06, 0x3B, /* class id */
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44, 0, /* length */
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0x01, 0x00, 0x00, 0x00, /* v1, reserved 1..3 */
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0x00, 0x10, 0x00, 0x00, /* on/off-mode, update ephemeris */
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u[3], u[2], u[1], u[0], /* update period, ms, 120s=00 01 D4 C0, 30s= 00 00 75 30 */
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s[3], s[2], s[1], s[0], /* search period, ms, 120s, 20s = 00 00 4E 20, 5s = 13 88 */
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0x00, 0x00, 0x00, 0x00, /* grid offset */
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0x00, 0x00, /* on-time after first fix */
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0x01, 0x00, /* minimum acquisition time */
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0x00, 0x00, 0x00, 0x00, /* reserved 4,5 */
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0x00, 0x00, 0x00, 0x00, /* reserved 6 */
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0x00, 0x00, 0x00, 0x00, /* reserved 7 */
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0x00, 0x00, 0x00, 0x00, /* reserved 8,9,10 */
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0x00, 0x00, 0x00, 0x00]); /* reserved 11 */
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}
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// enable power saving mode, after configured with PM2
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function UBX_CFG_RXM() {
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writeGPScmd([0x06, 0x11, /* UBX-CFG-RXM */
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2, 0, /* length */
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0x08, 0x01]); /* reserved, enable power save mode */
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}
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/*
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* Save configuration otherwise it will reset when the GPS wakes up
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*
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*/
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function UBX_CFG_SAVE() {
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writeGPScmd([0x06, 0x09, // class id
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0x0D, 0x00, // length
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0x00, 0x00, 0x00, 0x00, // clear mask
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0xFF, 0xFF, 0x00, 0x00, // save mask
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0x00, 0x00, 0x00, 0x00, // load mask
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0x07]); // b2=eeprom b1=flash b0=bat backed ram
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}
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/*
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* Reset to factory settings using clear mask in UBX_CFG_CFG
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* https://portal.u-blox.com/s/question/0D52p0000925T00CAE/ublox-max-m8q-getting-stuck-when-sleeping-with-extint-pin-control
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*/
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function UBX_CFG_RESET() {
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writeGPScmd([0x06, 0x09, // class id
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0x0D, 0x00,
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0xFF, 0xFB, 0x00, 0x00, // clear mask
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0x00, 0x00, 0x00, 0x00, // save mask
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0xFF, 0xFF, 0x00, 0x00, // load mask
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0x17]);
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}
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/*********** GPS Setup Menu App *****************************/
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function showMainMenu() {
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var power_options = ["SuperE","PSMOO"];
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const mainmenu = {
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'': { 'title': 'GPS Setup' },
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'< Back': ()=>{exitSetup();},
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'Power Mode': {
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value: 0 | power_options.indexOf(settings.power_mode),
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min: 0, max: 1,
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format: v => power_options[v],
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onchange: v => {
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settings.power_mode = power_options[v];
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updateSettings();
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},
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},
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'Update (s)': {
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value: settings.update,
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min: 10,
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max: 1800,
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step: 10,
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onchange: v => {
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settings.update =v;
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updateSettings();
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}
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},
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'Search (s)': {
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value: settings.search,
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min: 1,
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max: 65,
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step: 1,
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onchange: v => {
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settings.search = v;
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updateSettings();
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}
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}
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};
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return E.showMenu(mainmenu);
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}
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/*
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function exitSetup() {
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log_debug("exitSetup()");
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if (settings_changed) {
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log_debug(settings);
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E.showMessage("Configuring GPS");
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setupGPS();
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}
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load();
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}
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*/
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function exitSetup() {
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log_debug("exitSetup()");
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if (settings_changed) {
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log_debug(settings);
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E.showMessage("Configuring GPS");
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setTimeout(function() {
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setupGPS();
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setTimeout(function() { load() }, 750);
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}, 500);
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} else {
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load();
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};
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}
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/*
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function exitSetup() {
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log_debug("exitSetup()");
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if (settings_changed) {
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log_debug(settings);
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g.clear();
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g.setFontAlign(0,0);
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g.setColor(3);
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g.setFontVector(25);
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g.drawString("Configuring GPS",120,120);
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setTimeout(function() {
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setupGPS();
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setTimeout(function() { load() }, 500);
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}, 500);
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} else load();
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}
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*/
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loadSettings();
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showMainMenu();
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@ -0,0 +1,4 @@
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(function(back) {
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// just go right to our app
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load("gpssetup.app.js");
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})();
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@ -0,0 +1 @@
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{"power_mode":"SuperE", "update":120, "search":6}
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