X-Git-Url: https://hackdaworld.org/gitweb/?a=blobdiff_plain;f=betty%2Fdisplay.c;h=2da19efe9ffa8f4ba42d32bd89c5339c369cfa13;hb=96c6e10b97b3cce49a3c2090108ea29d23ec3950;hp=4d4e1e1a292498939fc9cc8ecd31cbbde1c199f8;hpb=dae61ba4bd4aa88003cae65e454c03aa0a1f85f4;p=my-code%2Farm.git

diff --git a/betty/display.c b/betty/display.c
index 4d4e1e1..2da19ef 100644
--- a/betty/display.c
+++ b/betty/display.c
@@ -5,6 +5,13 @@
  *
  */
 
+/*
+ * some comments on alpha blending!
+ *
+ * ...
+ *
+ */
+
 #include "display.h"
 #include "system.h"
 #include "default_logo.h"
@@ -17,55 +24,64 @@
 void display_fill_screen(u8 fill) {
 
 	u8 page,width;
+	u8 buf[2];
+
+	buf[0]=0;
+	buf[1]=0;
+
+	switch(fill) {
+		case DISPLAY_FILL_LG:
+			buf[1]=0xff;
+			break;
+		case DISPLAY_FILL_DG:
+			buf[0]=0xff;
+			break;
+		case DISPLAY_FILL_B:
+			buf[0]=0xff;
+			buf[1]=0xff;
+			break;
+		case DISPLAY_FILL_W:
+		default:
+			break;
+	}
 
 	for(page=0;page<DISPLAY_PAGE_MAX;page++) {
 		DISPLAY_SET_C_ADDR(0);
 		DISPLAY_SET_PAGE_ADDR(page);
 		for(width=0;width<DISPLAY_DIMX;width++) {
-			DISPLAY_DATA=fill;
-			DISPLAY_DATA=fill;
+			DISPLAY_DATA=buf[0];
+			DISPLAY_DATA=buf[1];
 		}
 	}
 }
 
 void display_clear_screen(void) {
 
-	display_fill_screen(0x00);
+	display_fill_screen(DISPLAY_FILL_W);
 }
 
 void display_init(void) {
 
-	DISPLAY_EXIT_POWER_SAVE;
-
-	DISPLAY_SOFT_RESET;
-	pause(0xffffff);
-
+	/* oscillator, regulator, boost, opamp, contrast */
 	DISPLAY_START_OSCILLATOR;
-
 	DISPLAY_SET_REGULATOR(7);
-
 	DISPLAY_SET_CONTRAST(0x38);
-
 	DISPLAY_SET_CONV_FACTOR(0x01);
-
-	DISPLAY_SET_PWM_FRC(0,0);
+	DISPLAY_SET_POWER(DISPLAY_V_BOOST|DISPLAY_REGULATOR|DISPLAY_OPAMP);
 
 	// gray scale palette
 	DISPLAY_SET_WHITE(0,0,0,0);
-	DISPLAY_SET_LGRAY(2,2,2,2);
-	DISPLAY_SET_DGRAY(6,6,6,6);
+	DISPLAY_SET_LGRAY(5,5,5,5);	// obviously 3, but it's too bright!
+	DISPLAY_SET_DGRAY(7,7,7,7);	// obviously 6, but again too bright!
 	DISPLAY_SET_BLACK(9,9,9,9);
 
-	DISPLAY_SET_POWER(DISPLAY_REGULATOR|DISPLAY_OPAMP);
-	pause(0xffffff);
-	DISPLAY_SET_POWER(DISPLAY_V_BOOST|DISPLAY_REGULATOR|DISPLAY_OPAMP);
-	
+	/* normal mode, display depending ram content */
 	DISPLAY_RAM_CONTENTS_ON;
-
-	DISPLAY_NORMAL;
-
 	display_clear_screen();
+	DISPLAY_NORMAL;			// 00 -> white, 11 -> black
+	DISPLAY_SET_COM_ODIR_REMAPPED;	// start counting at the top
 
+	/* switch on the display */
 	DISPLAY_SET_ON;
 }
 
@@ -88,6 +104,54 @@ void display_load_logo(u8 *src) {
 	}
 }
 
+void display_draw_rectangle(int x,int y,int w,int h,u8 fill,u8 alpha) {
+
+	int c,r,rmax;
+	u8 p,spage,epage;
+	u8 b[2],a[2];		// c = a over b => c=alpha*a+(1-alpha)*b
+
+	a[0]=0;
+	a[1]=0;
+	switch(fill) {
+		case DISPLAY_FILL_LG:
+			a[1]=1;
+			break;
+		case DISPLAY_FILL_DG:
+			a[0]=1;
+			break;
+		case DISPLAY_FILL_B:
+			a[0]=1;
+			a[1]=1;
+		case DISPLAY_FILL_W:
+		default:
+			break;
+	}
+
+	spage=y>>3;					// start page = y/8
+	epage=(y+h)>>3;					// end page (y+h)/8
+
+	for(p=spage;p<=epage;p++) {
+		DISPLAY_SET_PAGE_ADDR(p);
+		for(c=x;c<x+w;c++) {
+			DISPLAY_SET_C_ADDR(c);
+			b[0]=DISPLAY_DATA;		// dummy read (p.16)
+			b[0]=DISPLAY_DATA;
+			b[1]=DISPLAY_DATA;
+			rmax=y+8>y+h?y+h:y+8;
+			for(r=y;r<rmax;r++) {
+				b[0]&=~(1<<r);
+				b[1]&=~(1<<r);
+				b[0]|=a[0]<<r;
+				b[1]|=a[1]<<r;
+			}
+			DISPLAY_SET_C_ADDR(c);
+			DISPLAY_DATA=b[0];
+			DISPLAY_DATA=b[1];
+		}
+		y+=8;
+	}
+}
+
 void display_bl_init(void) {
 
 	IODIR0|=(1<<4);