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Code Issues Releases Wiki Activity

Add functions for pushing bitmaps to Bangle.js, also add configurable MTU. If we receive a bigger data packet then we know we can send a bigger one too

This commit is contained in:
Gordon Williams 2021-08-04 16:37:40 +01:00
parent a302b5509f
commit 9222c6700e
1 changed files with 66 additions and 2 deletions
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68
app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/banglejs/BangleJSDeviceSupport.java
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@ -20,7 +20,13 @@ import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCharacteristic;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.util.Base64;
import android.widget.Toast;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;
@ -75,6 +81,7 @@ public class BangleJSDeviceSupport extends AbstractBTLEDeviceSupport {
private static final Logger LOG = LoggerFactory.getLogger(BangleJSDeviceSupport.class);
private BluetoothGattCharacteristic rxCharacteristic = null;
private BluetoothGattCharacteristic txCharacteristic = null;
private int mtuSize = 20;
private String receivedLine = "";
private boolean realtimeHRM = false;
@ -123,9 +130,9 @@ public class BangleJSDeviceSupport extends AbstractBTLEDeviceSupport {
LOG.info("UART TX: " + str);
byte[] bytes;
bytes = str.getBytes(StandardCharsets.ISO_8859_1);
for (int i=0;i<bytes.length;i+=20) {
for (int i=0;i<bytes.length;i+=mtuSize) {
int l = bytes.length-i;
if (l>20) l=20;
if (l>mtuSize) l=mtuSize;
byte[] packet = new byte[l];
System.arraycopy(bytes, i, packet, 0, l);
builder.write(txCharacteristic, packet);
@ -275,6 +282,9 @@ public class BangleJSDeviceSupport extends AbstractBTLEDeviceSupport {
}
if (BangleJSConstants.UUID_CHARACTERISTIC_NORDIC_UART_RX.equals(characteristic.getUuid())) {
byte[] chars = characteristic.getValue();
// check to see if we get more data - if so, increase out MTU for sending
if (chars.length > mtuSize)
mtuSize = chars.length;
String packetStr = new String(chars);
LOG.info("RX: " + packetStr);
receivedLine += packetStr;
@ -583,4 +593,58 @@ public class BangleJSDeviceSupport extends AbstractBTLEDeviceSupport {
LOG.info("JSONException: " + e.getLocalizedMessage());
}
}
/** Convert an Android bitmap to a base64 string for use in Espruino.
* Currently only 1bpp, no scaling */
public static String bitmapToEspruino(Bitmap bitmap) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
byte bmp[] = new byte[((height * width + 7) >> 3) + 3];
int n = 0, c = 0, cn = 0;
bmp[n++] = (byte)width;
bmp[n++] = (byte)height;
bmp[n++] = 1;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
boolean pixel = (bitmap.getPixel(x, y) & 255) > 128;
c = (c << 1) | (pixel?1:0);
cn++;
if (cn == 8) {
bmp[n++] = (byte)c;
cn = 0;
c = 0;
}
}
}
if (cn > 0) bmp[n++] = (byte)c;
//LOG.info("BMP: " + width + "x"+height+" n "+n);
// Convert to base64
return Base64.encodeToString(bmp, Base64.DEFAULT).replaceAll("\n","");
}
/** Convert a drawable to a bitmap, for use with bitmapToEspruino */
public static Bitmap drawableToBitmap(Drawable drawable) {
if (drawable instanceof BitmapDrawable) {
BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
if (bitmapDrawable.getBitmap() != null) {
return bitmapDrawable.getBitmap();
}
}
int w = 1;
int h = 8;
if (drawable.getIntrinsicWidth() > 0 && drawable.getIntrinsicHeight() > 0) {
} else {
w = drawable.getIntrinsicWidth();
h = drawable.getIntrinsicHeight();
if (w>64) w=64;
if (h>64) h=64;
}
Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); // Single color bitmap will be created of 1x1 pixel
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
}