Datalog (#233)

* support for custom csv separator

* simple datalog frameowrk

* api strings

* hide setfile

* storage fixes

* log seconds, not milliseconds

libs/datalog/README.md

@@ -0,0 +1,3 @@
+# Datalog
+
+A tiny libraty to create CSV datalog files.

libs/datalog/_locales/datalog-jsdoc-strings.json

@@ -0,0 +1,8 @@
+{
+  "datalog.addRow": "Starts a row of data",
+  "datalog.addValue": "Adds a cell to the row of data",
+  "datalog.addValue|param|name": "name of the cell, eg: \"x\"",
+  "datalog.addValue|param|value": "value of the cell, eg: 0",
+  "datalog.setFile": "Starts a new data logger for the given file",
+  "datalog.setStorage": "* @param storage custom storage solution"
+}

libs/datalog/_locales/datalog-strings.json

@@ -0,0 +1,6 @@
+{
+  "datalog.addRow|block": "datalog add row",
+  "datalog.addValue|block": "datalog add %name|=%value",
+  "datalog|block": "datalog",
+  "{id:category}Datalog": "Datalog"
+}

libs/datalog/datalog.ts

@@ -0,0 +1,90 @@
+//% weight=100 color=#0fbc11 icon=""
+namespace datalog {
+    let _headers: string[] = undefined;
+    let _headersLength: number;
+    let _values: number[];
+    let _start: number;
+    let _filename = "data.csv";
+    let _storage: storage.Storage = storage.temporary;
+
+    function clear() {
+        _headers = undefined;        
+        _values = undefined;
+    }
+
+    function init() {
+        if (!_headers) {
+            _headers = [];
+            _headersLength = 0;
+            _start = control.millis();
+            _storage.remove(_filename);
+        }
+        _values = [];
+    }
+
+    function commit() {
+        // write row if any data
+        if (_values && _values.length > 0) {
+            // write headers for the first row
+            if (!_headersLength) {
+                _storage.appendCSVHeaders(_filename, _headers);
+                _headersLength = _storage.size(_filename);
+            }
+            // commit row data
+            _storage.appendCSV(_filename, _values);
+        }
+
+        // clear values
+        _values = undefined;
+    }
+
+    /**
+     * Starts a row of data
+     */
+    //% weight=100
+    //% blockId=datalogAddRow block="datalog add row"
+    export function addRow(): void {
+        commit();
+        init();
+        const s = (control.millis() - _start) / 1000;
+        addValue("time (s)", s);
+    }
+
+    /**
+     * Adds a cell to the row of data
+     * @param name name of the cell, eg: "x"
+     * @param value value of the cell, eg: 0
+     */
+    //% weight=99
+    //% blockId=datalogAddValue block="datalog add %name|=%value"
+    export function addValue(name: string, value: number) {
+        if (!_values) return;
+        let i = _headers.indexOf(name);
+        if (i < 0) {
+            _headers.push(name);
+            i = _headers.length - 1;
+        }
+        _values[i] = value;
+        if (i > 0) // 0 is time
+            console.logValue(name, value)
+    }
+
+    /**
+     * Starts a new data logger for the given file
+     */
+    //%
+    export function setFile(fn: string) {
+        _filename = fn;
+        clear();
+    }
+
+    /**
+     * 
+     * @param storage custom storage solution
+     */
+    //%
+    export function setStorage(storage: storage.Storage) {
+        _storage = storage;
+        clear();
+    }
+}

libs/datalog/pxt.json

@@ -0,0 +1,16 @@
+{
+    "name": "datalog",
+    "description": "Tiny data logging framework",
+    "files": [
+        "README.md",
+        "datalog.ts"
+    ],
+    "testFiles": [
+        "test.ts"
+    ],
+    "public": true,
+    "dependencies": {
+            "core": "file:../core",
+            "storage": "file:../storage"
+    }
+}

libs/datalog/test.ts

@@ -0,0 +1,6 @@
+
+loops.forever(function () {
+    datalog.addRow()
+    datalog.addValue("x", Math.random())
+    datalog.addValue("y", Math.random())
+})

libs/storage/storage-core.ts

@@ -6,7 +6,10 @@ namespace storage {
 
     //% fixedInstances
     export class Storage {
-        constructor() { }
+        csvSeparator: string;
+        constructor() { 
+            this.csvSeparator = ",";
+        }
 
         protected mapFilename(filename: string) {
             return filename;
@@ -69,23 +72,23 @@ namespace storage {
         appendCSVHeaders(filename: string, headers: string[]) {
             let s = ""
             for (const d of headers) {
-                if (s) s += "\t"
+                if (s) s += this.csvSeparator;
                 s = s + d;
             }
             s += "\r\n"
             this.append(filename, s)
         }
 
-                /**
-         * Append a row of CSV data
-         * @param filename the file name to append data, eg: "data.csv"
-         * @param data the data to append
-         */
+        /**
+ * Append a row of CSV data
+ * @param filename the file name to append data, eg: "data.csv"
+ * @param data the data to append
+ */
         //% blockId=storageAppendCSV block="storage %source|%filename|append CSV %data"
         appendCSV(filename: string, data: number[]) {
             let s = ""
             for (const d of data) {
-                if (s) s += "\t"
+                if (s) s += this.csvSeparator;
                 s = s + d;
             }
             s += "\r\n"

pxtarget.json

@@ -16,8 +16,9 @@
         "libs/infrared-sensor",
         "libs/gyro-sensor",
         "libs/chassis",
-        "libs/storage",
         "libs/ev3",
+        "libs/storage",
+        "libs/datalog",
         "libs/tests",
         "libs/behaviors"
     ],