Tomas Kucera / RA8875

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Dependents:   HagridOS5

Fork of RA8875 by David Smart

Diff: RA8875.cpp

Revision:
142:6e9bff59878a
Parent:
141:2ec78a50dc98
Child:
143:e872d65a710d
--- a/RA8875.cpp	Thu Dec 29 20:06:00 2016 +0000
+++ b/RA8875.cpp	Sun Mar 19 21:41:24 2017 +0000
@@ -281,17 +281,19 @@
 }
 
 
-RetCode_t RA8875::SelectDrawingLayer(uint16_t layer)
+uint16_t RA8875::SelectDrawingLayer(uint16_t layer)
 {
-    unsigned char mwcr1 = ReadCommand(0x41) & ~0x01; // retain all but the currently selected layer
-
+    unsigned char mwcr1 = ReadCommand(0x41); // retain all but the currently selected layer
+    uint16_t prevlayer = mwcr1 & 1;
+    
+    mwcr1 &= ~0x01; // remove the current layer
     if (screenwidth >= 800 && screenheight >= 480 && screenbpp > 8) {
-        return bad_parameter;
+        layer = 0;
     } else if (layer > 1) {
-        return bad_parameter;
-    } else { // layer == 0 ro 1
-        return WriteCommand(0x41, mwcr1 | layer);
+        layer = 0;
     }
+    WriteCommand(0x41, mwcr1 | layer);
+    return prevlayer;
 }
 
 
@@ -1193,7 +1195,7 @@
             SelectDrawingLayer(1);
             clsw(FULLWINDOW);
         }
-        ret = SelectDrawingLayer(prevLayer);
+        SelectDrawingLayer(prevLayer);
     }
     ret = SetTextCursor(0,0);
     ret = locate(0,0);