+/*
+ * lcd128x64.c:
+ * Graphics-based LCD driver.
+ * This is designed to drive the parallel interface LCD drivers
+ * based on the generic 12864H chips
+ *
+ * There are many variations on these chips, however they all mostly
+ * seem to be similar.
+ * This implementation has the Pins from the Pi hard-wired into it,
+ * in particular wiringPi pins 0-7 so that we can use
+ * digitalWriteByete() to speed things up somewhat.
+ *
+ * Copyright (c) 2013 Gordon Henderson.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ * https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ * wiringPi is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * wiringPi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <wiringPi.h>
+
+#include "font.h"
+#include "lcd128x64.h"
+
+// Size
+
+#define LCD_WIDTH 128
+#define LCD_HEIGHT 64
+
+// Hardware Pins
+// Note pins 0-7 are the 8-bit data port
+
+#define CS1 10
+#define CS2 11
+#define STROBE 12
+#define RS 13
+
+// Software copy of the framebuffer
+// it's 8-bit deep although the display itself is only 1-bit deep.
+
+static unsigned char frameBuffer [LCD_WIDTH * LCD_HEIGHT] ;
+
+static int maxX, maxY ;
+static int lastX, lastY ;
+static int xOrigin, yOrigin ;
+static int lcdOrientation = 0 ;
+
+/*
+ * strobe:
+ * Toggle the strobe (Really the "E") pin to the device.
+ * According to the docs, data is latched on the falling edge.
+ *********************************************************************************
+ */
+
+static void strobe (void)
+{
+ digitalWrite (STROBE, 1) ; delayMicroseconds (1) ;
+ digitalWrite (STROBE, 0) ; delayMicroseconds (5) ;
+}
+
+
+/*
+ * sentData:
+ * Send an data or command byte to the display.
+ *********************************************************************************
+ */
+
+static void sendData (const int data, const int chip)
+{
+ digitalWrite (chip, 0) ;
+ digitalWriteByte (data) ;
+ strobe () ;
+ digitalWrite (chip, 1) ;
+}
+
+
+/*
+ * sendCommand:
+ * Send a command byte to the display
+ *********************************************************************************
+ */
+
+static void sendCommand (const int command, const int chip)
+{
+ digitalWrite (RS, 0) ;
+ sendData (command, chip) ;
+ digitalWrite (RS, 1) ;
+}
+
+
+/*
+ * setCol: SetLine:
+ * Set the column and line addresses
+ *********************************************************************************
+ */
+
+static void setCol (int col, const int chip)
+ { sendCommand (0x40 | (col & 0x3F), chip) ; }
+
+static void setLine (int line, const int chip)
+ { sendCommand (0xB8 | (line & 0x07), chip) ; }
+
+
+/*
+ * lcd128x64update:
+ * Copy our software version to the real display
+ *********************************************************************************
+ */
+
+void lcd128x64update (void)
+{
+ int line, x, y, fbLoc ;
+ unsigned char byte ;
+
+// Left side
+
+ for (line = 0 ; line < 8 ; ++line)
+ {
+ setCol (0, CS1) ;
+ setLine (line, CS1) ;
+
+ for (x = 63 ; x >= 0 ; --x)
+ {
+ byte = 0 ;
+ for (y = 0 ; y < 8 ; ++y)
+ {
+ fbLoc = x + (((7 - line) * 8) + (7 - y)) * LCD_WIDTH ;
+ if (frameBuffer [fbLoc] != 0)
+ byte |= (1 << y) ;
+ }
+ sendData (byte, CS1) ;
+ }
+ }
+
+// Right side
+
+ for (line = 0 ; line < 8 ; ++line)
+ {
+ setCol (0, CS2) ;
+ setLine (line, CS2) ;
+
+ for (x = 127 ; x >= 64 ; --x)
+ {
+ byte = 0 ;
+ for (y = 0 ; y < 8 ; ++y)
+ {
+ fbLoc = x + (((7 - line) * 8) + (7 - y)) * LCD_WIDTH ;
+ if (frameBuffer [fbLoc] != 0)
+ byte |= (1 << y) ;
+ }
+ sendData (byte, CS2) ;
+ }
+ }
+}
+
+
+/*
+ * lcd128x64setOrigin:
+ * Set the display offset origin
+ *********************************************************************************
+ */
+
+void lcd128x64setOrigin (int x, int y)
+{
+ xOrigin = x ;
+ yOrigin = y ;
+}
+
+
+/*
+ * lcd128x64setOrientation:
+ * Set the display orientation:
+ * 0: Normal, the display is portrait mode, 0,0 is top left
+ * 1: Landscape
+ * 2: Portrait, flipped
+ * 3: Landscape, flipped
+ *********************************************************************************
+ */
+
+void lcd128x64setOrientation (int orientation)
+{
+ lcdOrientation = orientation & 3 ;
+
+ lcd128x64setOrigin (0,0) ;
+
+ switch (lcdOrientation)
+ {
+ case 0:
+ maxX = LCD_WIDTH ;
+ maxY = LCD_HEIGHT ;
+ break ;
+
+ case 1:
+ maxX = LCD_HEIGHT ;
+ maxY = LCD_WIDTH ;
+ break ;
+
+ case 2:
+ maxX = LCD_WIDTH ;
+ maxY = LCD_HEIGHT ;
+ break ;
+
+ case 3:
+ maxX = LCD_HEIGHT ;
+ maxY = LCD_WIDTH ;
+ break ;
+ }
+}
+
+
+/*
+ * lcd128x64orientCoordinates:
+ * Adjust the coordinates given to the display orientation
+ *********************************************************************************
+ */
+
+void lcd128x64orientCoordinates (int *x, int *y)
+{
+ register int tmp ;
+
+ *x += xOrigin ;
+ *y += yOrigin ;
+ *y = maxY - *y - 1 ;
+
+ switch (lcdOrientation)
+ {
+ case 0:
+ break;
+
+ case 1:
+ tmp = maxY - *y - 1 ;
+ *y = *x ;
+ *x = tmp ;
+ break;
+
+ case 2:
+ *x = maxX - *x - 1 ;
+ *y = maxY - *y - 1 ;
+ break;
+
+ case 3:
+ *x = maxX - *x - 1 ;
+ tmp = *y ;
+ *y = *x ;
+ *x = tmp ;
+ break ;
+ }
+}
+
+
+/*
+ * lcd128x64getScreenSize:
+ * Return the max X & Y screen sizes. Needs to be called again, if you
+ * change screen orientation.
+ *********************************************************************************
+ */
+
+void lcd128x64getScreenSize (int *x, int *y)
+{
+ *x = maxX ;
+ *y = maxY ;
+}
+
+
+/*
+ *********************************************************************************
+ * Standard Graphical Functions
+ *********************************************************************************
+ */
+
+
+/*
+ * lcd128x64point:
+ * Plot a pixel.
+ *********************************************************************************
+ */
+
+void lcd128x64point (int x, int y, int colour)
+{
+ lastX = x ;
+ lastY = y ;
+
+ lcd128x64orientCoordinates (&x, &y) ;
+
+ if ((x < 0) || (x >= LCD_WIDTH) || (y < 0) || (y >= LCD_HEIGHT))
+ return ;
+
+ frameBuffer [x + y * LCD_WIDTH] = colour ;
+}
+
+
+/*
+ * lcd128x64line: lcd128x64lineTo:
+ * Classic Bressenham Line code
+ *********************************************************************************
+ */
+
+void lcd128x64line (int x0, int y0, int x1, int y1, int colour)
+{
+ int dx, dy ;
+ int sx, sy ;
+ int err, e2 ;
+
+ lastX = x1 ;
+ lastY = y1 ;
+
+ dx = abs (x1 - x0) ;
+ dy = abs (y1 - y0) ;
+
+ sx = (x0 < x1) ? 1 : -1 ;
+ sy = (y0 < y1) ? 1 : -1 ;
+
+ err = dx - dy ;
+
+ for (;;)
+ {
+ lcd128x64point (x0, y0, colour) ;
+
+ if ((x0 == x1) && (y0 == y1))
+ break ;
+
+ e2 = 2 * err ;
+
+ if (e2 > -dy)
+ {
+ err -= dy ;
+ x0 += sx ;
+ }
+
+ if (e2 < dx)
+ {
+ err += dx ;
+ y0 += sy ;
+ }
+ }
+
+}
+
+void lcd128x64lineTo (int x, int y, int colour)
+{
+ lcd128x64line (lastX, lastY, x, y, colour) ;
+}
+
+
+/*
+ * lcd128x64rectangle:
+ * A rectangle is a spoilt days fishing
+ *********************************************************************************
+ */
+
+void lcd128x64rectangle (int x1, int y1, int x2, int y2, int colour, int filled)
+{
+ register int x ;
+
+ if (filled)
+ {
+ /**/ if (x1 == x2)
+ lcd128x64line (x1, y1, x2, y2, colour) ;
+ else if (x1 < x2)
+ for (x = x1 ; x <= x2 ; ++x)
+ lcd128x64line (x, y1, x, y2, colour) ;
+ else
+ for (x = x2 ; x <= x1 ; ++x)
+ lcd128x64line (x, y1, x, y2, colour) ;
+ }
+ else
+ {
+ lcd128x64line (x1, y1, x2, y1, colour) ;
+ lcd128x64lineTo (x2, y2, colour) ;
+ lcd128x64lineTo (x1, y2, colour) ;
+ lcd128x64lineTo (x1, y1, colour) ;
+ }
+}
+
+
+/*
+ * lcd128x64circle:
+ * This is the midpoint circle algorithm.
+ *********************************************************************************
+ */
+
+void lcd128x64circle (int x, int y, int r, int colour, int filled)
+{
+ int ddF_x = 1 ;
+ int ddF_y = -2 * r ;
+
+ int f = 1 - r ;
+ int x1 = 0 ;
+ int y1 = r ;
+
+ if (filled)
+ {
+ lcd128x64line (x, y + r, x, y - r, colour) ;
+ lcd128x64line (x + r, y, x - r, y, colour) ;
+ }
+ else
+ {
+ lcd128x64point (x, y + r, colour) ;
+ lcd128x64point (x, y - r, colour) ;
+ lcd128x64point (x + r, y, colour) ;
+ lcd128x64point (x - r, y, colour) ;
+ }
+
+ while (x1 < y1)
+ {
+ if (f >= 0)
+ {
+ y1-- ;
+ ddF_y += 2 ;
+ f += ddF_y ;
+ }
+ x1++ ;
+ ddF_x += 2 ;
+ f += ddF_x ;
+ if (filled)
+ {
+ lcd128x64line (x + x1, y + y1, x - x1, y + y1, colour) ;
+ lcd128x64line (x + x1, y - y1, x - x1, y - y1, colour) ;
+ lcd128x64line (x + y1, y + x1, x - y1, y + x1, colour) ;
+ lcd128x64line (x + y1, y - x1, x - y1, y - x1, colour) ;
+ }
+ else
+ {
+ lcd128x64point (x + x1, y + y1, colour) ; lcd128x64point (x - x1, y + y1, colour) ;
+ lcd128x64point (x + x1, y - y1, colour) ; lcd128x64point (x - x1, y - y1, colour) ;
+ lcd128x64point (x + y1, y + x1, colour) ; lcd128x64point (x - y1, y + x1, colour) ;
+ lcd128x64point (x + y1, y - x1, colour) ; lcd128x64point (x - y1, y - x1, colour) ;
+ }
+ }
+}
+
+
+/*
+ * lcd128x64ellipse:
+ * Fast ellipse drawing algorithm by
+ * John Kennedy
+ * Mathematics Department
+ * Santa Monica College
+ * 1900 Pico Blvd.
+ * Santa Monica, CA 90405
+ * jrkennedy6@gmail.com
+ * -Confirned in email this algorithm is in the public domain -GH-
+ *********************************************************************************
+ */
+
+static void plot4ellipsePoints (int cx, int cy, int x, int y, int colour, int filled)
+{
+ if (filled)
+ {
+ lcd128x64line (cx + x, cy + y, cx - x, cy + y, colour) ;
+ lcd128x64line (cx - x, cy - y, cx + x, cy - y, colour) ;
+ }
+ else
+ {
+ lcd128x64point (cx + x, cy + y, colour) ;
+ lcd128x64point (cx - x, cy + y, colour) ;
+ lcd128x64point (cx - x, cy - y, colour) ;
+ lcd128x64point (cx + x, cy - y, colour) ;
+ }
+}
+
+void lcd128x64ellipse (int cx, int cy, int xRadius, int yRadius, int colour, int filled)
+{
+ int x, y ;
+ int xChange, yChange, ellipseError ;
+ int twoAsquare, twoBsquare ;
+ int stoppingX, stoppingY ;
+
+ twoAsquare = 2 * xRadius * xRadius ;
+ twoBsquare = 2 * yRadius * yRadius ;
+
+ x = xRadius ;
+ y = 0 ;
+
+ xChange = yRadius * yRadius * (1 - 2 * xRadius) ;
+ yChange = xRadius * xRadius ;
+
+ ellipseError = 0 ;
+ stoppingX = twoBsquare * xRadius ;
+ stoppingY = 0 ;
+
+ while (stoppingX >= stoppingY) // 1st set of points
+ {
+ plot4ellipsePoints (cx, cy, x, y, colour, filled) ;
+ ++y ;
+ stoppingY += twoAsquare ;
+ ellipseError += yChange ;
+ yChange += twoAsquare ;
+
+ if ((2 * ellipseError + xChange) > 0 )
+ {
+ --x ;
+ stoppingX -= twoBsquare ;
+ ellipseError += xChange ;
+ xChange += twoBsquare ;
+ }
+ }
+
+ x = 0 ;
+ y = yRadius ;
+
+ xChange = yRadius * yRadius ;
+ yChange = xRadius * xRadius * (1 - 2 * yRadius) ;
+
+ ellipseError = 0 ;
+ stoppingX = 0 ;
+ stoppingY = twoAsquare * yRadius ;
+
+ while (stoppingX <= stoppingY) //2nd set of points
+ {
+ plot4ellipsePoints (cx, cy, x, y, colour, filled) ;
+ ++x ;
+ stoppingX += twoBsquare ;
+ ellipseError += xChange ;
+ xChange += twoBsquare ;
+
+ if ((2 * ellipseError + yChange) > 0 )
+ {
+ --y ;
+ stoppingY -= twoAsquare ;
+ ellipseError += yChange ;
+ yChange += twoAsquare ;
+ }
+ }
+}
+
+
+/*
+ * lcd128x64putchar:
+ * Print a single character to the screen
+ *********************************************************************************
+ */
+
+void lcd128x64putchar (int x, int y, int c, int bgCol, int fgCol)
+{
+ int y1, y2 ;
+
+ unsigned char line ;
+ unsigned char *fontPtr ;
+
+// Can't print if we're offscreen
+
+//if ((x < 0) || (x >= (maxX - fontWidth)) || (y < 0) || (y >= (maxY - fontHeight)))
+// return ;
+
+ fontPtr = font + c * fontHeight ;
+
+ for (y1 = fontHeight - 1 ; y1 >= 0 ; --y1)
+ {
+ y2 = y + y1 ;
+ line = *fontPtr++ ;
+ lcd128x64point (x + 0, y2, (line & 0x80) == 0 ? bgCol : fgCol) ;
+ lcd128x64point (x + 1, y2, (line & 0x40) == 0 ? bgCol : fgCol) ;
+ lcd128x64point (x + 2, y2, (line & 0x20) == 0 ? bgCol : fgCol) ;
+ lcd128x64point (x + 3, y2, (line & 0x10) == 0 ? bgCol : fgCol) ;
+ lcd128x64point (x + 4, y2, (line & 0x08) == 0 ? bgCol : fgCol) ;
+ lcd128x64point (x + 5, y2, (line & 0x04) == 0 ? bgCol : fgCol) ;
+ lcd128x64point (x + 6, y2, (line & 0x02) == 0 ? bgCol : fgCol) ;
+ lcd128x64point (x + 7, y2, (line & 0x01) == 0 ? bgCol : fgCol) ;
+ }
+}
+
+
+/*
+ * lcd128x64puts:
+ * Send a string to the display. Obeys \n and \r formatting
+ *********************************************************************************
+ */
+
+void lcd128x64puts (int x, int y, const char *str, int bgCol, int fgCol)
+{
+ int c, mx, my ;
+
+ mx = x ; my = y ;
+
+ while (*str)
+ {
+ c = *str++ ;
+
+ if (c == '\r')
+ {
+ mx = x ;
+ continue ;
+ }
+
+ if (c == '\n')
+ {
+ mx = x ;
+ my -= fontHeight ;
+ continue ;
+ }
+
+ lcd128x64putchar (mx, my, c, bgCol, fgCol) ;
+
+ mx += fontWidth ;
+ if (mx >= (maxX - fontWidth))
+ {
+ mx = 0 ;
+ my -= fontHeight ;
+ }
+ }
+}
+
+
+/*
+ * lcd128x64clear:
+ * Clear the display to the given colour.
+ *********************************************************************************
+ */
+
+void lcd128x64clear (int colour)
+{
+ register int i ;
+ register unsigned char *ptr = frameBuffer ;
+
+ for (i = 0 ; i < (maxX * maxY) ; ++i)
+ *ptr++ = colour ;
+}
+
+
+
+
+/*
+ * lcd128x64setup:
+ * Initialise the display and GPIO.
+ *********************************************************************************
+ */
+
+int lcd128x64setup (void)
+{
+ int i ;
+
+ for (i = 0 ; i < 8 ; ++i)
+ pinMode (i, OUTPUT) ;
+
+ digitalWrite (CS1, 1) ;
+ digitalWrite (CS2, 1) ;
+ digitalWrite (STROBE, 0) ;
+ digitalWrite (RS, 1) ;
+
+ pinMode (CS1, OUTPUT) ;
+ pinMode (CS2, OUTPUT) ;
+ pinMode (STROBE, OUTPUT) ;
+ pinMode (RS, OUTPUT) ;
+
+ sendCommand (0x3F, CS1) ; // Display ON
+ sendCommand (0xC0, CS1) ; // Set display start line to 0
+
+ sendCommand (0x3F, CS2) ; // Display ON
+ sendCommand (0xC0, CS2) ; // Set display start line to 0
+
+ lcd128x64clear (0) ;
+ lcd128x64setOrientation (0) ;
+ lcd128x64update () ;
+
+ return 0 ;
+}
~ianmdlvl / wiringPi.git / commitdiff
