add js adc

by jamisonderek

https://github.com/Next-Flip/Momentum-Firmware/pull/143/files

applications/system/js_app/examples/apps/Scripts/js_examples/adc.js

@@ -0,0 +1,42 @@
+// This is an example of how to use the analog pins (ADC) on the Flipper Zero. 
+// The example uses a reference voltage of 2048mV (2.048V), but you can also use 2500mV (2.5V). 
+// The example reads the values of the analog pins A7, A6, and A4 and prints them to the console. 
+// The example also checks if the value of A7 is twice the value of A6 and breaks the loop if it is. 
+// The example uses the analog pins A7, A6, and A4, but you can also use PC3, PC1, and PC0. 
+
+let gpio = require("gpio");
+
+// initialize pins A7, A6, A4 as analog (you can also use PC3, PC1, PC0)
+gpio.init("PA7", "analog", "no"); // pin, mode, pull
+gpio.init("PA6", "analog", "no"); // pin, mode, pull
+gpio.init("PA4", "analog", "no"); // pin, mode, pull
+
+gpio.startAnalog(2048); // vRef = 2.048V (you can also use 2500 for a 2.5V reference voltage)
+
+while (true) {
+    let pa7_value = gpio.readAnalog("PA7");
+    let pa6_value = gpio.readAnalog("PA6");
+    let pa4_value = gpio.readAnalog("PA4");
+    print("A7: " + to_string(pa7_value) + " A6: " + to_string(pa6_value) + " A4: " + to_string(pa4_value));
+    delay(100);
+    if (pa7_value === pa6_value * 2) {
+        break;
+    }
+}
+print("A7 is twice A6!");
+
+gpio.stopAnalog();
+
+// possible analog pins https://docs.flipper.net/gpio-and-modules#miFsS
+// "PA7" aka 2
+// "PA6" aka 3
+// "PA4" aka 4
+// "PC3" aka 7
+// "PC1" aka 15
+// "PC0" aka 16
+
+// possible modes
+// "analog"
+
+// possible pull
+// "no"