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https://github.com/Rockbox/rockbox.git
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dcd71e66bd
Saves 100+ bytes (50 of it in iram), saves a bit of power Internal LCD clock decreased but with added efficiency of drawing routines loses only around 2 Hz on the scanrate (~75Hz) while fps is slightly increased Column offsets are now calculated outside the loops saving a few instructions Passing a LCD_NOP command after lcd_update turns off Data/Cmd# gpio saving a bit more power Added a function lcd_write_cmd_triple() that allows 3 commands to be sent at once when enabled with LCD_USE_FIFO_FOR_COMMANDS it sends them back to back without checking FIFO status in between or sending to thhe D/C# Gpio. Makes an assumption about the FIFO being large enough to accept 3 commands after being emptied which should be the case on the clipv1, clipv2, clipplus. I have only enabled it for the clip plus as thats the only device I have to test it on. On clip+ the SSP clock is now turned off when screen is off Change-Id: Ib5fd24697bfe4ac8b8ee017361e789e4a7910d21
117 lines
3 KiB
C
117 lines
3 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) 2008 François Dinel
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* Copyright (C) 2008-2009 Rafaël Carré
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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#include "config.h"
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#include "lcd.h"
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#include "lcd-clip.h"
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#include "system.h"
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#include "cpu.h"
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int lcd_hw_init(void)
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{
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bitset32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE);
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SSP_CPSR = AS3525_SSP_PRESCALER; /* OF = 0x10 */
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SSP_CR0 = (1<<7) | (1<<6) | 7; /* Motorola SPI frame format, 8 bits */
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SSP_CR1 = (1<<3) | (1<<1); /* SSP Operation enabled */
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SSP_IMSC = 0; /* No interrupts */
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/* configure GPIO B2 (display D/C#) as output */
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GPIOB_DIR |= (1<<2);
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/* configure GPIO B3 (display type detect) as input */
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GPIOB_DIR &= ~(1<<3);
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/* reset display using GPIO A5 (display RESET#) */
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GPIOA_DIR |= (1<<5);
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GPIOA_PIN(5) = 0;
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udelay(1000);
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GPIOA_PIN(5) = (1<<5);
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/* detect display type on GPIO B3 */
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return GPIOB_PIN(3) ? 1 : 0;
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}
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void lcd_write_command(int byte)
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{
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while(SSP_SR & (1<<4)) /* BSY flag */
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;
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/* LCD command mode */
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GPIOB_PIN(2) = 0;
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SSP_DATA = byte;
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while(SSP_SR & (1<<4)) /* BSY flag */
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;
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}
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void lcd_write_cmd_triplet(int cmd1, int cmd2, int cmd3)
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{
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#ifndef LCD_USE_FIFO_FOR_COMMANDS
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lcd_write_command(cmd1);
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lcd_write_command(cmd2);
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lcd_write_command(cmd3);
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#else
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/* combine writes to data register */
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while(SSP_SR & (1<<4)) /* BSY flag */
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;
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/* FIFO is empty at this point */
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/* LCD command mode */
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GPIOB_PIN(2) = 0;
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/* !!makes assumption FIFO is at least (3) levels deep!! */
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SSP_DATA = cmd1;
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SSP_DATA = cmd2;
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SSP_DATA = cmd3;
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while(SSP_SR & (1<<4)) /* BSY flag */
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;
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#endif
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}
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void lcd_write_data(const fb_data* p_bytes, int count)
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{
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/* LCD data mode */
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GPIOB_PIN(2) = (1<<2);
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while (count--)
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{
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while(!(SSP_SR & (1<<1))) /* wait until transmit FIFO is not full */
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;
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SSP_DATA = *p_bytes++;
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}
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}
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void lcd_enable_power(bool onoff)
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{
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#ifndef BOOTLOADER
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if (onoff)
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bitset32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE);
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else
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bitclr32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE);
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#else
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(void) onoff;
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#endif
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}
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