109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Daniel Stenberg <daniel@haxx.se>
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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/*
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* Hardware-specific implementations for the Archos Recorder LCD.
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*
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* Archos Jukebox Recorder LCD functions.
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* Solomon SSD1815Z controller and Shing Yih Technology G112064-30 LCD.
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*
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*/
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/* LCD command codes */
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#define LCD_CNTL_RESET 0xe2 /* Software reset */
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#define LCD_CNTL_POWER 0x2f /* Power control */
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#define LCD_CNTL_CONTRAST 0x81 /* Contrast */
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#define LCD_CNTL_OUTSCAN 0xc8 /* Output scan direction */
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#define LCD_CNTL_SEGREMAP 0xa1 /* Segment remap */
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#define LCD_CNTL_DISPON 0xaf /* Display on */
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#define LCD_CNTL_PAGE 0xb0 /* Page address */
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#define LCD_CNTL_HIGHCOL 0x10 /* Upper column address */
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#define LCD_CNTL_LOWCOL 0x00 /* Lower column address */
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/*
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* Initialize LCD
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*/
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void lcd_init (void)
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{
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/* Initialize PB0-3 as output pins */
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PBCR2 &= 0xff00; /* MD = 00 */
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PBIOR |= 0x000f; /* IOR = 1 */
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/* Initialize LCD */
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lcd_write (TRUE, LCD_CNTL_RESET);
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lcd_write (TRUE, LCD_CNTL_POWER);
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lcd_write (TRUE, LCD_CNTL_SEGREMAP);
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lcd_write (TRUE, LCD_CNTL_OUTSCAN);
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lcd_write (TRUE, LCD_CNTL_CONTRAST);
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lcd_write (TRUE, 0x30); /* contrast parameter */
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lcd_write (TRUE, LCD_CNTL_DISPON);
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lcd_clear();
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lcd_update();
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}
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/*
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* Update the display.
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* This must be called after all other LCD funtions that change the display.
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*/
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void lcd_update (void)
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{
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int row, col;
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/* Copy display bitmap to hardware */
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for (row = 0; row < DISP_Y/8; row++) {
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lcd_write (TRUE, LCD_CNTL_PAGE | (row & 0xf));
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lcd_write (TRUE, LCD_CNTL_HIGHCOL);
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lcd_write (TRUE, LCD_CNTL_LOWCOL);
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for (col = 0; col < DISP_X; col++)
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lcd_write (FALSE, display[row][col]);
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}
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}
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/*
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* Write a byte to LCD controller.
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* command is TRUE if value is a command byte.
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*/
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static void lcd_write (BOOL command, int value)
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{
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int i;
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/* Read PBDR, clear LCD bits */
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int pbdr = PBDR & ~(PBDR_LCD_CS1|PBDR_LCD_DC|PBDR_LCD_SDA|PBDR_LCD_SCK);
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if (!command)
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pbdr |= PBDR_LCD_DC; /* set data indicator */
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/* Send each bit, starting with MSB */
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for (i = 0; i < 8; i++) {
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if (value & 0x80) {
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/* Set data, toggle clock */
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PBDR = pbdr | PBDR_LCD_SDA;
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PBDR = pbdr | PBDR_LCD_SDA | PBDR_LCD_SCK;
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}
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else {
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/* Clear data, toggle clock */
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PBDR = pbdr;
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PBDR = pbdr | PBDR_LCD_SCK;
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}
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value <<= 1;
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}
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}
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