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334
bertos/drv/lcd_32122a.c
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334
bertos/drv/lcd_32122a.c
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/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2003, 2004, 2005, 2006 Develer S.r.l. (http://www.develer.com/)
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* Copyright 2001 Bernie Innocenti <bernie@codewiz.org>
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*
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* -->
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*
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* \brief Displaytech 32122A LCD driver
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*
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* \author Bernie Innocenti <bernie@codewiz.org>
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* \author Stefano Fedrigo <aleph@develer.com>
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*
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*/
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#include "lcd_32122a.h"
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#include "hw/hw_lcd_32122a.h"
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#include "cfg/cfg_lcd_32122a.h"
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#include <cfg/macros.h> /* BV() */
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#include <cfg/debug.h>
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#include <cfg/module.h>
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#include <gfx/gfx.h>
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#include <drv/timer.h>
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#include <drv/pwm.h>
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#include <cpu/irq.h>
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#include <cpu/types.h>
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/** Number of LCD pages */
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#define LCD_PAGES 4
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/** Width of an LCD page */
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#define LCD_PAGESIZE (LCD_WIDTH / 2)
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/**
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* \name 32122A Commands
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* @{
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*/
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#define LCD_CMD_DISPLAY_ON 0xAF
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#define LCD_CMD_DISPLAY_OFF 0xAE
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#define LCD_CMD_STARTLINE 0xC0
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#define LCD_CMD_PAGEADDR 0xB8
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#define LCD_CMD_COLADDR 0x00
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#define LCD_CMD_ADC_LEFT 0xA1
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#define LCD_CMD_ADC_RIGHT 0xA0
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#define LCD_CMD_STATIC_OFF 0xA4
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#define LCD_CMD_STATIC_ON 0xA5
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#define LCD_CMD_DUTY_32 0xA9
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#define LCD_CMD_DUTY_16 0xA8
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#define LCD_CMD_RMW_ON 0xE0
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#define LCD_CMD_RMW_OFF 0xEE
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#define LCD_CMD_RESET 0xE2
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/*@}*/
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/* Status flags */
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#define LCDF_BUSY BV(7)
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#if CONFIG_LCD_WAIT
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/**
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* \code
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* __ __
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* RS __\____________/__
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* ____________
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* R/W __/ \__
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* _______
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* E1 _____/ \____
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* ______ ____
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* DATA X/ \====/
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*
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* \endcode
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*/
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#define WAIT_LCD \
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do { \
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uint8_t status; \
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LCD_DB_IN; \
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do { \
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LCD_SET_RD; \
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LCD_CLR_A0; \
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LCD_SET_E1; \
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LCD_DELAY_READ; \
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status = LCD_READ; \
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LCD_CLR_E1; \
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LCD_SET_A0; \
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LCD_CLR_RD; \
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} while (status & LCDF_BUSY); \
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LCD_DB_OUT; \
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} while (0)
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#else /* CONFIG_LCD_WAIT */
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#define WAIT_LCD do {} while(0)
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#endif /* CONFIG_LCD_WAIT */
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/**
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* Raster buffer to draw into.
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*
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* Bits in the bitmap bytes have vertical orientation,
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* as required by the LCD driver.
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*/
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static uint8_t lcd_raster[RAST_SIZE(LCD_WIDTH, LCD_HEIGHT)];
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/** Default LCD bitmap */
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struct Bitmap lcd_bitmap;
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#if CONFIG_LCD_SOFTINT_REFRESH
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/** Timer for regular LCD refresh */
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static Timer lcd_refresh_timer;
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#endif /* CONFIG_LCD_SOFTINT_REFRESH */
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INLINE void lcd_32122_cmd(uint8_t cmd, uint8_t chip)
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{
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WAIT_LCD;
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/* __ __
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* A0 __\____________/__
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*
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* R/W __________________
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* ______
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* E1 _____/ \_____
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*
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* DATA --<============>--
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*/
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LCD_WRITE(cmd);
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//LCD_DB_OUT;
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LCD_CLR_A0;
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LCD_SET_E(chip);
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LCD_DELAY_WRITE;
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LCD_CLR_E(chip);
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LCD_SET_A0;
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//LCD_DB_IN;
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}
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INLINE uint8_t lcd_32122_read(uint8_t chip)
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{
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uint8_t data;
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WAIT_LCD;
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/**
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* \code
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* __________________
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* A0 __/ \__
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* ____________
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* R/W __/ \__
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* _______
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* E1 _____/ \____
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*
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* DATA -------<=====>----
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*
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* \endcode
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*/
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LCD_DB_IN;
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//LCD_SET_A0;
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LCD_SET_RD;
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LCD_SET_E(chip);
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LCD_DELAY_READ;
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data = LCD_READ;
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LCD_CLR_E(chip);
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LCD_CLR_RD;
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//LCD_CLR_A0;
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LCD_DB_OUT;
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return data;
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}
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INLINE void lcd_32122_write(uint8_t c, uint8_t chip)
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{
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WAIT_LCD;
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/**
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* \code
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* __________________
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* A0 ___/ \___
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*
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* R/W __________________
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* ______
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* E1 _____/ \_____
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*
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* DATA -<==============>-
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*
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* \endcode
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*/
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LCD_WRITE(c);
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//LCD_DB_OUT;
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//LCD_SET_A0;
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LCD_SET_E(chip);
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LCD_DELAY_WRITE;
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LCD_CLR_E(chip);
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//LCD_CLR_A0;
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//LCD_DB_IN;
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}
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static void lcd_32122_clear(void)
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{
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uint8_t page, j;
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for (page = 0; page < LCD_PAGES; ++page)
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{
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lcd_32122_cmd(LCD_CMD_COLADDR, LCDF_E1 | LCDF_E2);
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lcd_32122_cmd(LCD_CMD_PAGEADDR | page, LCDF_E1 | LCDF_E2);
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for (j = 0; j < LCD_PAGESIZE; j++)
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lcd_32122_write(0, LCDF_E1 | LCDF_E2);
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}
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}
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static void lcd_32122_writeRaster(const uint8_t *raster)
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{
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uint8_t page, rows;
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const uint8_t *right_raster;
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for (page = 0; page < LCD_PAGES; ++page)
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{
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lcd_32122_cmd(LCD_CMD_PAGEADDR | page, LCDF_E1 | LCDF_E2);
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lcd_32122_cmd(LCD_CMD_COLADDR | 0, LCDF_E1 | LCDF_E2);
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/* Super optimized lamer loop */
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right_raster = raster + LCD_PAGESIZE;
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rows = LCD_PAGESIZE;
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do
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{
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lcd_32122_write(*raster++, LCDF_E1);
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lcd_32122_write(*right_raster++, LCDF_E2);
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}
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while (--rows);
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raster = right_raster;
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}
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}
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#if CONFIG_LCD_SOFTINT_REFRESH
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static void lcd_32122_refreshSoftint(void)
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{
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lcd_32122_blitBitmap(&lcd_bitmap);
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timer_setDelay(&lcd_refresh_timer, ms_to_ticks(CONFIG_LCD_REFRESH));
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timer_add(&lcd_refresh_timer);
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}
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#endif /* CONFIG_LCD_SOFTINT_REFRESH */
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/**
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* Set LCD contrast PWM.
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*/
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void lcd_32122_setPwm(int duty)
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{
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ASSERT(duty >= LCD_MIN_PWM);
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ASSERT(duty <= LCD_MAX_PWM);
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pwm_setDuty(LCD_PWM_CH, duty);
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pwm_enable(LCD_PWM_CH, true);
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}
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/**
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* Update the LCD display with data from the provided bitmap.
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*/
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void lcd_32122_blitBitmap(const Bitmap *bm)
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{
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lcd_32122_writeRaster(bm->raster);
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}
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/**
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* Initialize LCD subsystem.
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*
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* \note The PWM used for LCD contrast is initialized in drv/pwm.c
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* because it is the same PWM used for output attenuation.
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*/
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void lcd_32122_init(void)
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{
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MOD_CHECK(timer);
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pwm_init();
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lcd_32122a_hw_bus_init();
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LCD_32122_RESET();
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lcd_32122_cmd(LCD_CMD_RESET, LCDF_E1 | LCDF_E2);
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lcd_32122_cmd(LCD_CMD_DISPLAY_ON, LCDF_E1 | LCDF_E2);
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lcd_32122_cmd(LCD_CMD_STARTLINE | 0, LCDF_E1 | LCDF_E2);
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lcd_32122_clear();
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lcd_32122_setPwm(LCD_DEF_PWM);
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gfx_bitmapInit(&lcd_bitmap, lcd_raster, LCD_WIDTH, LCD_HEIGHT);
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gfx_bitmapClear(&lcd_bitmap);
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#if CONFIG_LCD_SOFTINT_REFRESH
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/* Init IRQ driven LCD refresh */
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timer_setSoftint(&lcd_refresh_timer, (Hook)lcd_32122_refreshSoftint, 0);
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timer_setDelay(&lcd_refresh_timer, ms_to_ticks(CONFIG_LCD_REFRESH));
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timer_add(&lcd_refresh_timer);
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#endif /* CONFIG_LCD_SOFTINT_REFRESH */
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}
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