From 7ba92d8df84999a0d8f82934ced1766e745dc788 Mon Sep 17 00:00:00 2001
From: Anashuman Singh <anash.cheema@gmail.com>
Date: Wed, 14 Aug 2024 12:37:01 +0530
Subject: [PATCH] fix: fixed CCS811

---
 .../pslab/communication/sensors/CCS811.java   | 25 +++++++++++--------
 .../java/io/pslab/sensors/SensorCCS811.java   | 10 ++++----
 2 files changed, 20 insertions(+), 15 deletions(-)

diff --git a/app/src/main/java/io/pslab/communication/sensors/CCS811.java b/app/src/main/java/io/pslab/communication/sensors/CCS811.java
index 9bb027c38..1d7b97d67 100644
--- a/app/src/main/java/io/pslab/communication/sensors/CCS811.java
+++ b/app/src/main/java/io/pslab/communication/sensors/CCS811.java
@@ -17,31 +17,31 @@ public class CCS811 {
     private static final int HW_ID = 0x20;            // HW_ID # R 1 byte Hardware ID. The value is 0x81
     private static final int FW_BOOT_VERSION = 0x23;  // FW_Boot_Version # R 2 bytes firmware version number for the boot code. Firmware Application Version. The first 2 bytes contain
     private static final int FW_APP_VERSION = 0x24;   // FW_App_Version # R 2 bytes the firmware version number for the application code
-    private static final int SW_RESET = 0xFF;         // SW_RESET # W 4 bytes to this register in a single sequence the device will reset and return to BOOT mode.
 
     // Figure 25: CCS811 Bootloader Register Map
     // Address Register R/W Size Description
     private static final int HW_Version = 0x21;
+    private static final int APP_START = 0xF4;
 
     public CCS811(I2C i2c, ScienceLab scienceLab) throws Exception {
         this.i2c = i2c;
         if (scienceLab.isConnected()) {
             fetchID();
-            softwareReset();
+            appStart();
         }
     }
 
-    private void softwareReset() throws IOException {
-        i2c.write(ADDRESS, new int[]{0x11, 0xE5, 0x72, 0x8A}, SW_RESET);
-    }
-
     private void fetchID() throws IOException, InterruptedException {
+        i2c.write(ADDRESS, new int[]{}, HW_ID);
         int hardwareId = i2c.read(ADDRESS, 1, HW_ID).get(0) & 0xFF;
         Thread.sleep(20);
+        i2c.write(ADDRESS, new int[]{}, HW_Version);
         int hardwareVersion = i2c.read(ADDRESS, 1, HW_Version).get(0) & 0xFF;
         Thread.sleep(20);
+        i2c.write(ADDRESS, new int[]{}, FW_BOOT_VERSION);
         int bootVersion = i2c.read(ADDRESS, 2, FW_BOOT_VERSION).get(0) & 0xFF;
         Thread.sleep(20);
+        i2c.write(ADDRESS, new int[]{}, FW_APP_VERSION);
         int appVersion = i2c.read(ADDRESS, 2, FW_APP_VERSION).get(0) & 0xFF;
         Thread.sleep(20);
 
@@ -51,6 +51,10 @@ private void fetchID() throws IOException, InterruptedException {
         Log.d("CCS811", "App Version: " + appVersion);
     }
 
+    private void appStart() throws IOException {
+        i2c.write(ADDRESS, new int[]{}, APP_START);
+    }
+
     private String decodeError(int error) {
         String e = "";
         if ((error & (1)) > 0) {
@@ -74,15 +78,16 @@ private String decodeError(int error) {
         return "Error: " + e.substring(2);
     }
 
-    public double[] getRaw() throws IOException {
+    public int[] getRaw() throws IOException {
+        i2c.write(ADDRESS, new int[]{}, ALG_RESULT_DATA);
         ArrayList<Integer> data = i2c.read(ADDRESS, 8, ALG_RESULT_DATA);
-        double eCO2 = (data.get(0) & 0xFF) * 256 + (data.get(1) & 0xFF);
-        double TVOC = (data.get(2) & 0xFF) * 256 + (data.get(3) & 0xFF);
+        int eCO2 = ((data.get(0) & 0xFF) << 8) | (data.get(1) & 0xFF);
+        int TVOC = ((data.get(2) & 0xFF) << 8) | (data.get(3) & 0xFF);
         int errorId = data.get(5) & 0xFF;
 
         if (errorId > 0) {
             Log.d("CCS811", decodeError(errorId));
         }
-        return (new double[]{eCO2, TVOC});
+        return (new int[]{eCO2, TVOC});
     }
 }
diff --git a/app/src/main/java/io/pslab/sensors/SensorCCS811.java b/app/src/main/java/io/pslab/sensors/SensorCCS811.java
index 45274ed5e..c2218009e 100644
--- a/app/src/main/java/io/pslab/sensors/SensorCCS811.java
+++ b/app/src/main/java/io/pslab/sensors/SensorCCS811.java
@@ -282,9 +282,9 @@ public void onStopTrackingTouch(SeekBar seekBar) {
 
     private class SensorDataFetch extends AsyncTask<Void, Void, Void> {
 
-        private double[] dataCS811;
-        private Double dataCCS811eCO2;
-        private Double dataCCS811TVOC;
+        private int[] dataCS811;
+        private int dataCCS811eCO2;
+        private int dataCCS811TVOC;
         private long timeElapsed;
 
         @Override
@@ -299,8 +299,8 @@ protected Void doInBackground(Void... params) {
                 e.printStackTrace();
             }
             timeElapsed = (System.currentTimeMillis() - startTime) / 1000;
-            entrieseCO2.add(new Entry((float) timeElapsed, dataCCS811eCO2.floatValue()));
-            entriesTVOC.add(new Entry((float) timeElapsed, dataCCS811TVOC.floatValue()));
+            entrieseCO2.add(new Entry((float) timeElapsed, dataCCS811eCO2));
+            entriesTVOC.add(new Entry((float) timeElapsed, dataCCS811TVOC));
             return null;
         }