Add basic support for reading states

andychase · Apr 3, 2013 · ae597ba · ae597ba
1 parent 8cc8a3e
commit ae597ba
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Showing 2 changed files with 23 additions and 2 deletions.
diff --git a/js/io.js b/js/io.js
@@ -344,6 +344,8 @@ GameBoyAdvanceIO.prototype.loadU16 = function(offset) {
  	case this.SIOMULTI1:
  	case this.SIOMULTI2:
  	case this.SIOMULTI3:
+ 		return this.sio.read((offset - this.SIOMULTI0) >> 1);
+
  	case this.SIODATA8:
  		this.core.STUB('Unimplemented SIO register read: 0x' + offset.toString(16));
  		return 0;

diff --git a/js/sio.js b/js/sio.js
@@ -19,7 +19,9 @@ GameBoyAdvanceSIO.prototype.clear = function() {
 		si: 0,
 		id: 0,
 		error: 0,
-		busy: 0
+		busy: 0,
+
+		states: [ 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF ]
 	};
 
 	this.linkLayer = null;
@@ -107,4 +109,21 @@ GameBoyAdvanceSIO.prototype.readSIOCNT = function() {
 		break;
 	}
 	return value;
-}
+};
+
+GameBoyAdvanceSIO.prototype.read = function(slot) {
+	switch (this.mode) {
+	case this.SIO_NORMAL_32:
+		this.core.STUB('32-bit transfer unsupported');
+		break;
+	case this.SIO_MULTI:
+		return this.multiplayer.states[slot];
+	case this.SIO_UART:
+		this.core.STUB('UART unsupported');
+		break;
+	default:
+		this.core.WARN('Reading from transfer register in unsupported mode');
+		break;
+	}
+	return 0;
+};