E-Paper Driver HAT: Implemented setInvertDisplay()

eyro-labs · Jan 19, 2018 · d5dea49 · d5dea49
1 parent c25e476
commit d5dea49
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Showing 2 changed files with 23 additions and 13 deletions.
diff --git a/...epaperdriverhat/src/main/java/com/leinardi/android/things/driver/epaperdriverhat/Epd.java b/...epaperdriverhat/src/main/java/com/leinardi/android/things/driver/epaperdriverhat/Epd.java
@@ -171,14 +171,14 @@ public void reset() throws IOException {
      */
     public abstract void setPixel(int x, int y, boolean on) throws IllegalArgumentException;
 
-//    /**
-//     * Invert the display color without rewriting the contents of the display data RAM..
-//     *
-//     * @param invert Set to true to invert the display color; set to false to set the display back to normal.
-//     * @throws IOException
-//     * @throws IllegalStateException
-//     */
-//    public abstract void setInvertDisplay(boolean invert) throws IOException, IllegalStateException;
+    /**
+     * Invert the display color without rewriting the contents of the display data RAM..
+     *
+     * @param invert Set to true to invert the display color; set to false to set the display back to normal.
+     * @throws IOException
+     * @throws IllegalStateException
+     */
+    public abstract void setInvertDisplay(boolean invert) throws IOException, IllegalStateException;
 
     /**
      * Renders the current pixel data to the screen.
@@ -188,9 +188,9 @@ public void reset() throws IOException {
      */
     public abstract void show() throws IOException;
 
-    public abstract void wakeUp() throws IOException;
+    protected abstract void wakeUp() throws IOException;
 
-    public abstract void sleep() throws IOException;
+    protected abstract void sleep() throws IOException;
 
     protected abstract boolean isBusy() throws IOException;
 

diff --git a/...verhat/src/main/java/com/leinardi/android/things/driver/epaperdriverhat/Gdew075t8Epd.java b/...verhat/src/main/java/com/leinardi/android/things/driver/epaperdriverhat/Gdew075t8Epd.java
@@ -128,6 +128,7 @@ public class Gdew075t8Epd extends Epd {
     private static final int PIXEL_ON = 0b011;
 
     private byte[] mBuffer;
+    private boolean mInvertColor;
 
     public Gdew075t8Epd() throws IOException {
     }
@@ -163,6 +164,11 @@ public void setPixel(int x, int y, boolean on) throws IllegalArgumentException {
         }
     }
 
+    @Override
+    public void setInvertDisplay(boolean invert) throws IOException, IllegalStateException {
+        mInvertColor = invert;
+    }
+
     @Override
     public int getDisplayWidth() {
         return EPD_WIDTH;
@@ -184,7 +190,7 @@ public void show() throws IOException {
     }
 
     @Override
-    public void wakeUp() throws IOException {
+    protected void wakeUp() throws IOException {
         reset();
 
         sendCommand(SPI_FLASH_CONTROL);
@@ -226,7 +232,11 @@ public void wakeUp() throws IOException {
         sendData((byte) TEMPERATURE_CALIBRATION_INTERNAL);
 
         sendCommand(VCOM_AND_DATA_INTERVAL_SETTING);
-        sendData((byte) VCOM_AND_DATA_INTERVAL_SETTING_DEFAULT_WHITE_BALCK);
+        int vcomAndDataIntervalSetting = VCOM_AND_DATA_INTERVAL_SETTING_DEFAULT_WHITE_BALCK;
+        if (mInvertColor) {
+            vcomAndDataIntervalSetting |= VCOM_AND_DATA_INTERVAL_SETTING_INVERT_COLORS;
+        }
+        sendData((byte) vcomAndDataIntervalSetting);
 
         sendCommand(TCON_SETTING);
         sendData((byte) TCON_SETTING_DEFAULT_S2G_G2S);
@@ -248,7 +258,7 @@ public void wakeUp() throws IOException {
     }
 
     @Override
-    public void sleep() throws IOException {
+    protected void sleep() throws IOException {
         sendCommand(SPI_FLASH_CONTROL);
         sendData((byte) SPI_FLASH_CONTROL_ENABLED);