From d96a491d321c7f668994d05e5a2ac7c119fb9f5b Mon Sep 17 00:00:00 2001
From: Thomas Saunders <trsaunders@gmail.com>
Date: Mon, 25 Jun 2012 21:29:51 +0100
Subject: [PATCH] work in progress for partial area scroll

---
 console.c                 | 24 +++++++++++--------
 drivers/lcd/ssd1289_lld.c | 50 ++++++++++++++++++++++++++++++++-------
 2 files changed, 55 insertions(+), 19 deletions(-)

diff --git a/console.c b/console.c
index 08ee17d2..4d245a70 100644
--- a/console.c
+++ b/console.c
@@ -84,7 +84,7 @@ msg_t lcdConsoleInit(GLCDConsole *console, uint16_t x0, uint16_t y0, uint16_t x1
 
 	/* calculate the size of the console in characters */
 	console->sx = (x1-x0);
-	console->sy = ((int16_t)((y1-y0)/console->fy))*console->fy;
+	console->sy = (((int16_t)((y1-y0)/console->fy))-1)*console->fy;
 
 	console->cx = 0;
 	console->cy = 0;
@@ -102,13 +102,10 @@ msg_t lcdConsoleInit(GLCDConsole *console, uint16_t x0, uint16_t y0, uint16_t x1
 	console->font = font;
 }
 
-msg_t lcdConsoleUpdate(GLCDConsole *console) {
-
-}
-
 msg_t lcdConsolePut(GLCDConsole *console, char c) {
 	uint8_t width;
-	bool_t redraw = FALSE;
+	bool_t newline = FALSE;
+
 
 	if(c == '\n') {
 		/* clear the text at the end of the line */
@@ -123,19 +120,26 @@ msg_t lcdConsolePut(GLCDConsole *console, char c) {
 	} else {
 		width = lcdMeasureChar(c, console->font);
 		if((console->cx + width) >= console->sx) {
+			chprintf(&SD1, "[1] ");
 			console->cx = 0;
 			console->cy += console->fy;
 		}
 
-		if((console->cy + console->fy) >= console->sy) {
+		if(
+				(console->cy > console->sy)) {
+			chprintf(&SD1, "[2] ");
+			if(newline)
+				chprintf(&SD1, "* ");
 			lcdVerticalScroll(console->x0, console->y0, console->x0 + console->sx,
 					console->y0 + console->sy, console->fy);
 			/* reset the cursor */
 			console->cx = 0;
-			while((console->cy) >= console->sy)
-				console->cy -= console->fy;
+			console->cy = console->sy;
+		} else if(newline) {
+			chprintf(&SD1, "[3] ");
+			console->cy += console->fy;
 		}
-
+		//chprintf(&SD1, "'%c' at [%d, %d]\r\n", c, console->x0 + console->cx, console->y0 + console->cy);
 		lcdDrawChar(console->x0 + console->cx, console->y0 + console->cy, c,
 				console->font, console->color, console->bkcolor, solid);
 
diff --git a/drivers/lcd/ssd1289_lld.c b/drivers/lcd/ssd1289_lld.c
index 85250baf..3ea4806c 100644
--- a/drivers/lcd/ssd1289_lld.c
+++ b/drivers/lcd/ssd1289_lld.c
@@ -6,6 +6,9 @@ uint8_t orientation;
 uint16_t DeviceCode;
 extern uint16_t lcd_width, lcd_height;
 
+/* TODO: use max(height, width) */
+static uint16_t buf[SCREEN_HEIGHT];
+
 #ifdef LCD_USE_GPIO
 static __inline void lld_lcdWriteIndex(uint16_t index) {
     Clr_RS;
@@ -131,6 +134,21 @@ __inline void lld_lcdWriteStream(uint16_t *buffer, uint16_t size) {
 	for(i = 0; i < size; i++)
 		LCD_RAM = buffer[i];
 }
+
+__inline void lld_lcdReadStreamStart(void) {
+	LCD_REG = 0x0022;
+}
+
+__inline void lld_lcdReadStreamStop(void) {
+
+}
+
+__inline void lld_lcdReadStream(uint16_t *buffer, size_t size) {
+	uint16_t i;
+	for(i = 0; i < size; i++) {
+		buffer[i] = LCD_RAM;
+	}
+}
 #endif
 
 #ifdef LCD_USE_SPI
@@ -146,10 +164,10 @@ static __inline void lcdDelay(uint16_t us) {
 void lld_lcdSetCursor(uint16_t x, uint16_t y) {
 	if(PORTRAIT) {
 		lld_lcdWriteReg(0x004e, x); 
-		lld_lcdWriteReg(0x004f, y); 
+		lld_lcdWriteReg(0x004f, y);
 	} else if(LANDSCAPE) {
 		lld_lcdWriteReg(0x004e, y); 
-		lld_lcdWriteReg(0x004f, x); 
+		lld_lcdWriteReg(0x004f, x);
 	} 
 }
 
@@ -336,17 +354,31 @@ uint16_t lld_lcdGetWidth(void) {
 
 #include "chprintf.h"
 
+/* a positive lines value shifts the screen up, negative down */
 void lld_lcdVerticalScroll(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, int16_t lines) {
+	uint16_t row0, row1;
+	uint16_t i;
 	lld_lcdSetWindow(x0, y0, x1, y1);
 
-	/* if negative shift, then subtract from the height of the area */
-	lines = (lines < 0) ? ((y1-y0) + lines) : lines;
+	for(i = 0; i < ((y1-y0) - abs(lines)); i++) {
+		if(lines > 0) {
+			row0 = y0 + i + lines;
+			row1 = y0 + i;
+		} else {
+			row0 = (y1 - i - 1) + lines;
+			row1 = (y1 - i - 1);
+		}
+		/* read row0 into the buffer and then write at row1*/
+		lld_lcdSetWindow(x0, row0, x1, row0);
+		lld_lcdReadStreamStart();
+		lld_lcdReadStream(buf, x1-x0);
+		lld_lcdReadStreamStop();
 
-	/* driver accepts only 9 bit line value */
-	lld_lcdWriteReg(0x0041, (uint16_t)lines & 0x01FF);
-
-	/* enable the scroll */
-	lld_lcdWriteReg(0x0007, (0x0001 << 9) | 0x0133);
+		lld_lcdSetWindow(x0, row1, x1, row1);
+		lld_lcdWriteStreamStart();
+		lld_lcdWriteStream(buf, x1-x0);
+		lld_lcdWriteStreamStop();
+	}
 }
 
 #endif