lcd_support.c

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//==========================================================================
//
//        lcd_support.c
//
//        Cirrus Logic EDB7XXX - LCD support routines
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos 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 General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     gthomas
// Contributors:  gthomas
// Date:          2001-09-29
// Description:   Simple LCD support
//####DESCRIPTIONEND####

#include <pkgconf/hal.h>

#include <cyg/infra/diag.h>
#include <cyg/hal/hal_io.h>       // IO macros
#include <cyg/hal/hal_if.h>       // Virtual vector support
#include <cyg/hal/hal_arch.h>     // Register state info
#include <cyg/hal/hal_intr.h>     // HAL interrupt macros

#include <cyg/hal/hal_edb7xxx.h>  // Board definitions
#include <cyg/hal/lcd_support.h>
#include <cyg/hal/hal_cache.h>

#ifdef CYGPKG_ISOINFRA
# include <pkgconf/isoinfra.h>
# ifdef CYGINT_ISO_STDIO_FORMATTED_IO
#  include <stdio.h>  // sscanf
# endif
#endif

#ifndef FALSE
#define FALSE 0
#define TRUE  1
#endif

#ifdef CYGOPT_EDB7XXX_LCD_COMM_LOGO
#include "banner.xpm"
#endif
#include "font.h"

// Physical dimensions of LCD display
#define DISPLAY_WIDTH  320
#define DISPLAY_HEIGHT 240

// Logical layout
#ifdef CYGSEM_EDB7XXX_LCD_COMM_PORTRAIT_MODE
#define LCD_WIDTH  240
#define LCD_HEIGHT 320
#else
#define LCD_WIDTH  320
#define LCD_HEIGHT 240
#endif
#define LCD_DEPTH   16

#define USE_RGB565
#ifdef USE_RGB565
#define RGB_RED(x)   (((x)&0x1F)<<11)
#define RGB_GREEN(x) (((x)&0x3F)<<5)
#define RGB_BLUE(x)  ((x)&0x1F)
#else
#define RGB_RED(x)   (((x)&0x0F)<<12)
#define RGB_GREEN(x) (((x)&0x0F)<<7)
#define RGB_BLUE(x)  (((x)&0x0F)<<1)
#endif

// Physical screen info
//static int lcd_depth  = LCD_DEPTH;  // Should be 1, 2, or 4
static int lcd_bpp;
static int lcd_width  = LCD_WIDTH;
static int lcd_height = LCD_HEIGHT;

// Virtual screen info
static int curX = 0;  // Last used position
static int curY = 0;
//static int width = LCD_WIDTH / (FONT_WIDTH*NIBBLES_PER_PIXEL);
//static int height = LCD_HEIGHT / (FONT_HEIGHT*SCREEN_SCALE);

static int fg = RGB_RED(15) | RGB_GREEN(63) | RGB_BLUE(8);
static int bg = RGB_RED(0) | RGB_GREEN(0) | RGB_BLUE(15/*31*/);

#define SCREEN_PAN            20
#define SCREEN_WIDTH          80
#define SCREEN_HEIGHT         (LCD_HEIGHT/FONT_HEIGHT)
#define VISIBLE_SCREEN_WIDTH  (LCD_WIDTH/FONT_WIDTH)
#define VISIBLE_SCREEN_HEIGHT (LCD_HEIGHT/FONT_HEIGHT)
static char screen[SCREEN_HEIGHT][SCREEN_WIDTH];
static int screen_start = 0;
static int screen_height = SCREEN_HEIGHT;
static int screen_width = SCREEN_WIDTH;
static int screen_pan = 0;

static bool cursor_enable = true;

// Functions
static void lcd_drawc(cyg_int8 c, int x, int y);

// Note: val is a 16 bit, RGB565 value which must be mapped
// onto a 12 bit value.
#define RED(v)   ((v>>12) & 0x0F)
#define GREEN(v) ((v>>7) & 0x0F)
#define BLUE(v)  ((v>>1) & 0x0F)
#ifdef CYGSEM_EDB7XXX_LCD_COMM_PORTRAIT_MODE
// Translate coordinates, rotating clockwise 90 degrees
static void
set_pixel(int row, int col, unsigned short val)
{
//    fp->pixels[col][(DISPLAY_WIDTH-1)-row] = val;
    int _row = (240-1) - col;
    int _col = row;
    unsigned char *pxptr = (unsigned char *)(0xC0000000 + (_row * 480) + ((_col * 3) / 2));

    if ((row >= LCD_HEIGHT) || (col >= LCD_WIDTH)) return;
    if (0)
    {
        int old = start_console();
        diag_printf("row=%d/%d, col=%d/%d, pxptr = %p\n", row, _row, col, _col, pxptr);
        end_console(old);
    }
    if ((row % 2) == 0) {
        // Even row
        *pxptr++ = RED(val) | (GREEN(val) << 4);
        *pxptr = (*pxptr & 0xF0) | BLUE(val);   
    } else {
        // Odd row
        *pxptr = (*pxptr & 0x0F) | (RED(val) << 4);
        *++pxptr = GREEN(val) | (BLUE(val) << 4);
    }
}
#else
static void
set_pixel(int row, int col, unsigned short val)
{
    int vpx = (row * 320) + col;  // Virtual pixel address
    int rem = (vpx * 3) % 2;
    unsigned char *pxptr = (unsigned char *)(0xC0000000 + ((vpx * 3) / 2));

    if ((row >= LCD_HEIGHT) || (col >= LCD_WIDTH)) return;
    if (rem) {
        *pxptr = (*pxptr & 0x0F) | (RED(val) << 4);
        *++pxptr = GREEN(val) | (BLUE(val) << 4);
    } else {
        *pxptr++ = RED(val) | (GREEN(val) << 4);
        *pxptr = (*pxptr & 0xF0) | BLUE(val);
    }
}
#endif

static int
_hexdigit(char c)
{
    if ((c >= '0') && (c <= '9')) {
        return c - '0';
    } else
    if ((c >= 'A') && (c <= 'F')) {
        return (c - 'A') + 0x0A;
    } else
    if ((c >= 'a') && (c <= 'f')) {
        return (c - 'a') + 0x0a;
    }
}

static int
_hex(char *cp)
{
    return (_hexdigit(*cp)<<4) | _hexdigit(*(cp+1));
}

static unsigned short
parse_color(char *cp)
{
    int red, green, blue;

    while (*cp && (*cp != 'c')) cp++;
    if (cp) {
        cp += 2;
        if (*cp == '#') {
            red = _hex(cp+1);
            green = _hex(cp+3);
            blue = _hex(cp+5);
#ifdef USE_RGB565
            return RGB_RED(red>>3) | RGB_GREEN(green>>2) | RGB_BLUE(blue>>3);
#else
            return RGB_RED(red>>3) | RGB_GREEN(green>>3) | RGB_BLUE(blue>>3);
#endif
        } else {
            // Should be "None"
            return 0xFFFF;
        }
    } else {
        return 0xFFFF;
    }
}

#ifndef CYGINT_ISO_STDIO_FORMATTED_IO
static int
get_int(char **_cp)
{
    char *cp = *_cp;
    char c;
    int val = 0;
    
    while ((c = *cp++) && (c != ' ')) {
        if ((c >= '0') && (c <= '9')) {
            val = val * 10 + (c - '0');
        } else {
            return -1;
        }
    }
    *_cp = cp;
    return val;
}
#endif

#ifdef CYGOPT_EDB7XXX_LCD_COMM_LOGO
int
show_xpm(char *xpm[], int screen_pos)
{
    int i, row, col, offset;
    char *cp;
    int nrows, ncols, nclrs;
    unsigned short colors[256];  // Mapped by character index

    cp = xpm[0];
#ifdef CYGINT_ISO_STDIO_FORMATTED_IO
    if (sscanf(cp, "%d %d %d", &ncols, &nrows, &nclrs) != 3) {
#else
    if (((ncols = get_int(&cp)) < 0) ||
        ((nrows = get_int(&cp)) < 0) ||
        ((nclrs = get_int(&cp)) < 0)) {

#endif
        diag_printf("Can't parse XPM data, sorry\n");
        return 0;
    }
    // printf("%d rows, %d cols, %d colors\n", nrows, ncols, nclrs);

    for (i = 0;  i < 256;  i++) {
        colors[i] = 0x0000;
    }
    for (i = 0;  i < nclrs;  i++) {
        cp = xpm[i+1];
        colors[(unsigned int)*cp] = parse_color(&cp[1]);
        // printf("Color[%c] = %x\n", *cp, colors[(unsigned int)*cp]);
    }

#ifdef CYGOPT_EDB7XXX_LCD_COMM_LOGO_TOP
    offset = screen_pos;
#else
    offset = screen_pos-nrows;
#endif
    for (row = 0;  row < nrows;  row++) {            
        cp = xpm[nclrs+1+row];        
        for (col = 0;  col < ncols;  col++) {
            set_pixel(row+offset, col, colors[(unsigned int)*cp++]);
        }
    }
#ifdef CYGOPT_EDB7XXX_LCD_COMM_LOGO_TOP
    screen_start = (nrows + (FONT_HEIGHT-1))/FONT_HEIGHT;
    return offset+nrows;
#else    
    screen_height = offset / FONT_HEIGHT;
    return offset;
#endif
}
#endif

// Control state of LCD display

#define LCD_DCDC      0x02
#define LCD_ENABLE    0x04
#define LCD_BACKLIGHT 0x08
#define LCD_INIT (LCD_DCDC|LCD_ENABLE|LCD_BACKLIGHT)

void
lcd_on(bool enable)
{
    static bool enabled = true;

    if (enable) {
        if (!enabled) {
            *(volatile cyg_uint8 *)PDDR |= (LCD_ENABLE|LCD_BACKLIGHT);
            *(volatile cyg_uint32 *)SYSCON1 |= SYSCON1_LCDEN;
        }
        enabled = true;
    } else {
        if (enabled) {
            *(volatile cyg_uint32 *)SYSCON1 &= ~SYSCON1_LCDEN;
            *(volatile cyg_uint8 *)PDDR &= ~(LCD_ENABLE|LCD_BACKLIGHT);
        }
        enabled = false;
    }
}

// Initialize LCD hardware

void
lcd_init(int depth)
{
    // Hardwired for EDB7312
    *(volatile cyg_uint32 *)LCDCON = 0xE60F7C1F;
    *(volatile cyg_uint32 *)PALLSW = 0x76543210;
    *(volatile cyg_uint32 *)PALMSW = 0xFEDCBA98;
    *(volatile cyg_uint8 *)PDDR    |= LCD_INIT;  // Enable video + backlight + DC-DC converter
    *(volatile cyg_uint8 *)FRBADDR = 0x0C;  // Highest order nibble of LCD frame address
    *(volatile cyg_uint32 *)PMPCON = 0x800; // 96KHz, 50%
    lcd_on(true);
    lcd_clear();
}

// Get information about the frame buffer
int
lcd_getinfo(struct lcd_info *info)
{
#if 0 // this is all wrong
    if (lcd_bpp == 0) {
        return 0;  // LCD not initialized
    }
    info->width = DISPLAY_WIDTH;
    info->height = DISPLAY_HEIGHT;
    info->bpp = lcd_bpp;
    info->fb = 0xC0000000;
    info->rlen = DISPLAY_WIDTH * 2;
    info->type = FB_TRUE_RGB565;
    return 1; // Information valid
#else
    return 0;
#endif
}

// Clear screen
void
lcd_clear(void)
{
    int row, col;
    int pos;

#ifndef USE_RGB565
    int val;
    for (row = 0;  row < lcd_height;  row++) {
        for (col = 0;  col < lcd_width;  col++) {
            set_pixel(row, col, RGB_RED(31));
        }
    }
    CYGACC_CALL_IF_DELAY_US(10000000);

    for (row = 0;  row < lcd_height;  row++) {
        for (col = 0;  col < lcd_width;  col++) {
            set_pixel(row, col, RGB_GREEN(31));
        }
    }
    CYGACC_CALL_IF_DELAY_US(10000000);
    val = 0;
    for (pos = 0;  pos < 16;  pos++) {
        val = (1<<pos);
        diag_printf("Set pixel to 0x%04x\n", val);
        for (row = 0;  row < lcd_height;  row++) {
            for (col = 0;  col < lcd_width;  col++) {
                set_pixel(row, col, val);
            }
        }
        CYGACC_CALL_IF_DELAY_US(100000);
    }
    val = 0;
    for (pos = 8;  pos < 16;  pos++) {
        val |= (1<<pos);
        diag_printf("Set pixel to 0x%04x\n", val);
        for (row = 0;  row < lcd_height;  row++) {
            for (col = 0;  col < lcd_width;  col++) {
                set_pixel(row, col, val);
            }
        }
        CYGACC_CALL_IF_DELAY_US(100000);
    }

    for (row = 0;  row < lcd_height;  row++) {
        for (col = 0;  col < lcd_width;  col++) {
            set_pixel(row, col, RGB_BLUE(31));
        }
    }
    CYGACC_CALL_IF_DELAY_US(100000);
#endif // RGB565

    for (row = 0;  row < lcd_height;  row++) {
        for (col = 0;  col < lcd_width;  col++) {
            set_pixel(row, col, bg);
        }
    }
    for (row = 0;  row < screen_height;  row++) {
        for (col = 0;  col < screen_width;  col++) {
            screen[row][col] = ' ';
        }
    }
#ifdef CYGOPT_EDB7XXX_LCD_COMM_LOGO
    // Note: Row 0 seems to wrap incorrectly
#ifdef CYGOPT_EDB7XXX_LCD_COMM_LOGO_TOP
    pos = 0;
#else
    pos = (LCD_HEIGHT-1);
#endif
    show_xpm(banner_xpm, pos);
#endif // CYGOPT_EDB7XXX_LCD_COMM_LOGO
    curX = 0;  curY = screen_start;
    if (cursor_enable) {
        lcd_drawc(CURSOR_ON, curX-screen_pan, curY);
    }
}

// Position cursor
void
lcd_moveto(int X, int Y)
{
    if (cursor_enable) {
        lcd_drawc(screen[curY][curX], curX-screen_pan, curY);
    }
    if (X < 0) X = 0;
    if (X >= screen_width) X = screen_width-1;
    curX = X;
    if (Y < screen_start) Y = screen_start;
    if (Y >= screen_height) Y = screen_height-1;
    curY = Y;
    if (cursor_enable) {
        lcd_drawc(CURSOR_ON, curX-screen_pan, curY);
    }
}