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WIP: feat: Partial update #68

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WIP: feat: Partial update #68

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34 changes: 34 additions & 0 deletions lib/util/protocol.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,36 @@ class Protocol {
Future<Uint8List> enableEnergyHarvesting(Uint8List tagId) async {
return await _writeDynCfg(tagId, 0x02, 0x01);
}

// `pt_scan = true` means don't touch the outside pixels while refreshing
Future<Uint8List> _setPartialWindow(Uint8List tagId, int xsbank, int xebank, int ys, int ye, bool pt_scan) async {
// FIXME: move these constants to a specific controller
if (xsbank > 0x1d) throw "Horizontal start channel bank must be <= 0x1D";
if (xebank > 0x1d) throw "Horizontal end channel bank must be <= 0x1D";
if (xsbank >= xebank) throw "Start channel must be < End channel bank";

if (ys > 0x1df) throw "Horizontal start channel bank must be <= 0x1DF";
if (ye > 0x1df) throw "Horizontal end channel bank must be <= 0x1DF";
if (ys >= ye) throw "Start channel must be < End channel bank";

int HRST73 = xsbank << 3;
int HRED73 = (xebank << 3) | 0x07;
int VRST8 = (ys >> 8) & 1;
int VRST70 = ys & 0xff;
int VRED8 = (ye >> 8) & 1;
int VRED70 = ye & 0xff;

await _writeMsg(tagId, Uint8List.fromList([fw.epdCmd, 0x90]));
return await _writeMsg(tagId, Uint8List.fromList([fw.epdSend, HRST73, HRED73, VRST8, VRST70, VRED8, VRED70, pt_scan ? 1 : 0]));
}

void _partialIn(Uint8List tagId) async {
await _writeMsg(tagId, Uint8List.fromList([fw.epdCmd, 0x91]));
}

void _partialOut(Uint8List tagId) async {
await _writeMsg(tagId, Uint8List.fromList([fw.epdCmd, 0x92]));
}

Future<void> _sleep() async {
await Future.delayed(const Duration(milliseconds: 20));
Expand Down Expand Up @@ -128,13 +158,17 @@ class Protocol {
await Future.delayed(
const Duration(seconds: 2)); // waiting for the power supply stable

await _setPartialWindow(id, 0, epd.width ~/ 8 - 1, 0, epd.height - 1, true);

final epdColors = epd.extractEpaperColorFrames(image);
final transmissionLines = epd.controller.transmissionLines.iterator;
for (final c in epdColors) {
transmissionLines.moveNext();
await writeFrame(id, c, transmissionLines.current);
}

await _setPartialWindow(id, 0, 15, 0, 200, true);
_partialIn(id);
await _writeMsg(
id, Uint8List.fromList([fw.epdCmd, epd.controller.refresh]));
await FlutterNfcKit.finish();
Expand Down
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