JavaScript: SPI implementation (#272)

* JavaScript: SPI implementation

* Fix build

* Add typedefs

* Port example script to newJS

* Push new manifest to bottom

* Update changelog

---------

Co-authored-by: Willy-JL <49810075+Willy-JL@users.noreply.github.com>

applications/system/js_app/examples/apps/Scripts/Examples/spi.js

@@ -0,0 +1,88 @@
+// Connect a w25q32 SPI device to the Flipper Zero.
+// D1=pin 2 (MOSI), SLK=pin 5 (SCK), GND=pin 8 (GND), D0=pin 3 (MISO), CS=pin 4 (CS), VCC=pin 9 (3V3)
+let spi = require("spi");
+
+// Display textbox so user can scroll to see all output.
+let eventLoop = require("event_loop");
+let gui = require("gui");
+let text = "SPI demo\n";
+let textBox = require("gui/text_box").makeWith({
+    focus: "end",
+    font: "text",
+    text: text,
+});
+
+function addText(add) {
+    text += add;
+    textBox.set("text", text);
+}
+
+gui.viewDispatcher.switchTo(textBox);
+
+// writeRead returns a buffer the same length as the input buffer.
+// We send 6 bytes of data, starting with 0x90, which is the command to read the manufacturer ID.
+// Can also use Uint8Array([0x90, 0x00, ...]) as write parameter
+// Optional timeout parameter in ms. We set to 100ms.
+let data_buf = spi.writeRead([0x90, 0x0, 0x0, 0x0, 0x0, 0x0], 100);
+let data = Uint8Array(data_buf);
+if (data.length === 6) {
+    if (data[4] === 0xEF) {
+        addText("Found Winbond device\n");
+        if (data[5] === 0x15) {
+            addText("Device ID: W25Q32\n");
+        } else {
+            addText("Unknown device ID: " + data[5].toString(16) + "\n");
+        }
+    } else if (data[4] === 0x0) {
+        addText("Be sure Winbond W25Q32 is connected to Flipper Zero SPI pins.\n");
+    } else {
+        addText("Unknown device. Manufacturer ID: " + data[4].toString(16) + "\n");
+    }
+}
+
+addText("\nReading JEDEC ID\n");
+
+// Acquire the SPI bus. Multiple calls will happen with Chip Select (CS) held low.
+spi.acquire();
+
+// Send command (0x9F) to read JEDEC ID.
+// Can also use Uint8Array([0x9F]) as write parameter
+// Note: you can pass an optional timeout parameter in milliseconds.
+spi.write([0x9F]);
+
+// Request 3 bytes of data.
+// Note: you can pass an optional timeout parameter in milliseconds.
+data_buf = spi.read(3);
+
+// Release the SPI bus as soon as we are done with the set of SPI commands.
+spi.release();
+
+data = Uint8Array(data_buf);
+addText("JEDEC MF ID: " + data[0].toString(16) + "\n");
+addText("JEDEC Memory Type: " + data[1].toString(16) + "\n");
+addText("JEDEC Capacity ID: " + data[2].toString(16) + "\n");
+
+if (data[0] === 0xEF) {
+    addText("Found Winbond device\n");
+}
+let capacity = data[1] << 8 | data[2];
+if (capacity === 0x4016) {
+    addText("Device: W25Q32\n");
+} else if (capacity === 0x4015) {
+    addText("Device: W25Q16\n");
+} else if (capacity === 0x4014) {
+    addText("Device: W25Q80\n");
+} else {
+    addText("Unknown device\n");
+}
+
+// Wait for user to close the app
+eventLoop.subscribe(gui.viewDispatcher.navigation, function (_sub, _, eventLoop) {
+    eventLoop.stop();
+}, eventLoop);
+
+// This script has no interaction, only textbox, so event loop doesn't need to be running all the time
+// We run it at the end to accept input for the back button press to quit
+// But before that, user sees a textbox and pressing back has no effect
+// This is fine because it allows simpler logic and the code above takes no time at all to run
+eventLoop.run();