4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
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11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2003, 2004, 2005, 2006 Develer S.r.l. (http://www.develer.com/)
30 * Copyright 2001 Bernardo Innocenti <bernie@codewiz.org>
36 * \author Bernardo Innocenti <bernie@develer.com>
37 * \author Stefano Fedrigo <aleph@develer.com>
39 * \brief Displaytech 32122A LCD driver
42 #include "lcd_32122a_avr.h"
44 #include <drv/timer.h>
47 #include <cpu/types.h>
49 #include <cfg/macros.h> /* BV() */
50 #include <cfg/debug.h>
56 /* Configuration sanity checks */
57 #if !defined(CONFIG_LCD_SOFTINT_REFRESH) || (CONFIG_LCD_SOFTINT_REFRESH != 0 && CONFIG_LCD_SOFTINT_REFRESH != 1)
58 #error CONFIG_LCD_SOFTINT_REFRESH must be defined to either 0 or 1
60 #if !defined(CONFIG_LCD_SOFTINT_REFRESH) || (CONFIG_LCD_SOFTINT_REFRESH != 0 && CONFIG_LCD_SOFTINT_REFRESH != 1)
61 #error CONFIG_LCD_SOFTINT_REFRESH must be defined to either 0 or 1
65 #if CONFIG_LCD_SOFTINT_REFRESH
67 /** Interval between softint driven lcd refresh */
68 # define LCD_REFRESH_INTERVAL 20 /* 20ms -> 50fps */
70 #endif /* CONFIG_LCD_SOFTINT_REFRESH */
72 /** Number of LCD pages */
75 /** Width of an LCD page */
76 #define LCD_PAGESIZE (LCD_WIDTH / 2)
79 * \name LCD I/O pins/ports
82 #define LCD_PF_DB0 PF4
83 #define LCD_PF_DB1 PF5
84 #define LCD_PF_DB2 PF6
85 #define LCD_PF_DB3 PF7
86 #define LCD_PD_DB4 PD4
87 #define LCD_PD_DB5 PD5
88 #define LCD_PD_DB6 PD6
89 #define LCD_PD_DB7 PD7
97 * \name DB high nibble (DB[4-7])
100 #define LCD_DATA_HI_PORT PORTD
101 #define LCD_DATA_HI_PIN PIND
102 #define LCD_DATA_HI_DDR DDRD
103 #define LCD_DATA_HI_SHIFT 0
104 #define LCD_DATA_HI_MASK 0xF0
108 * \name DB low nibble (DB[0-3])
111 #define LCD_DATA_LO_PORT PORTF
112 #define LCD_DATA_LO_PIN PINF
113 #define LCD_DATA_LO_DDR DDRF
114 #define LCD_DATA_LO_SHIFT 4
115 #define LCD_DATA_LO_MASK 0xF0
119 * \name LCD bus control macros
122 #define LCD_CLR_A0 (PORTB &= ~BV(LCD_PB_A0))
123 #define LCD_SET_A0 (PORTB |= BV(LCD_PB_A0))
124 #define LCD_CLR_RD (PORTE &= ~BV(LCD_PE_RW))
125 #define LCD_SET_RD (PORTE |= BV(LCD_PE_RW))
126 #define LCD_CLR_E1 (PORTE &= ~BV(LCD_PE_E1))
127 #define LCD_SET_E1 (PORTE |= BV(LCD_PE_E1))
128 #define LCD_CLR_E2 (PORTE &= ~BV(LCD_PE_E2))
129 #define LCD_SET_E2 (PORTE |= BV(LCD_PE_E2))
130 #define LCD_SET_E(x) (PORTE |= (x))
131 #define LCD_CLR_E(x) (PORTE &= ~(x))
135 * \name Chip select bits for LCD_SET_E()
138 #define LCDF_E1 (BV(LCD_PE_E1))
139 #define LCDF_E2 (BV(LCD_PE_E2))
142 /** Read from the LCD data bus (DB[0-7]) */
144 ((LCD_DATA_LO_PIN & LCD_DATA_LO_MASK) >> LCD_DATA_LO_SHIFT) | \
145 ((LCD_DATA_HI_PIN & LCD_DATA_HI_MASK) >> LCD_DATA_HI_SHIFT) \
148 /** Write to the LCD data bus (DB[0-7]) */
149 #define LCD_WRITE(d) \
151 LCD_DATA_LO_PORT = (LCD_DATA_LO_PORT & ~LCD_DATA_LO_MASK) | (((d)<<LCD_DATA_LO_SHIFT) & LCD_DATA_LO_MASK); \
152 LCD_DATA_HI_PORT = (LCD_DATA_HI_PORT & ~LCD_DATA_HI_MASK) | (((d)<<LCD_DATA_HI_SHIFT) & LCD_DATA_HI_MASK); \
155 /** Set data bus direction to output (write to display) */
158 LCD_DATA_LO_DDR |= LCD_DATA_LO_MASK; \
159 LCD_DATA_HI_DDR |= LCD_DATA_HI_MASK; \
162 /** Set data bus direction to input (read from display) */
165 LCD_DATA_LO_DDR &= ~LCD_DATA_LO_MASK; \
166 LCD_DATA_HI_DDR &= ~LCD_DATA_HI_MASK; \
169 /** Delay for tEW (160ns) */
170 #define LCD_DELAY_WRITE \
176 /** Delay for tACC6 (180ns) */
177 #define LCD_DELAY_READ \
186 * \name 32122A Commands
189 #define LCD_CMD_DISPLAY_ON 0xAF
190 #define LCD_CMD_DISPLAY_OFF 0xAE
191 #define LCD_CMD_STARTLINE 0xC0
192 #define LCD_CMD_PAGEADDR 0xB8
193 #define LCD_CMD_COLADDR 0x00
194 #define LCD_CMD_ADC_LEFT 0xA1
195 #define LCD_CMD_ADC_RIGHT 0xA0
196 #define LCD_CMD_STATIC_OFF 0xA4
197 #define LCD_CMD_STATIC_ON 0xA5
198 #define LCD_CMD_DUTY_32 0xA9
199 #define LCD_CMD_DUTY_16 0xA8
200 #define LCD_CMD_RMW_ON 0xE0
201 #define LCD_CMD_RMW_OFF 0xEE
202 #define LCD_CMD_RESET 0xE2
209 #define LCDF_BUSY BV(7)
215 * RS __\____________/__
238 } while (status & LCDF_BUSY); \
242 #else /* CONFIG_LCD_WAIT */
244 #define WAIT_LCD do {} while(0)
246 #endif /* CONFIG_LCD_WAIT */
250 * Raster buffer to draw into.
252 * Bits in the bitmap bytes have vertical orientation,
253 * as required by the LCD driver.
255 DECLARE_WALL(wall_before_raster, WALL_SIZE)
256 static uint8_t lcd_raster[RAST_SIZE(LCD_WIDTH, LCD_HEIGHT)];
257 DECLARE_WALL(wall_after_raster, WALL_SIZE)
259 /** Default LCD bitmap */
260 struct Bitmap lcd_bitmap;
263 #if CONFIG_LCD_SOFTINT_REFRESH
265 /** Timer for regular LCD refresh */
266 static Timer *lcd_refresh_timer;
268 #endif /* CONFIG_LCD_SOFTINT_REFRESH */
272 static bool lcd_check(void)
275 uint16_t retries = 32768;
279 cbi(PORTC, PCB_LCD_RS);
280 sbi(PORTC, PCB_LCD_RW);
281 sbi(PORTC, PCB_LCD_E);
285 cbi(PORTC, PCB_LCD_E);
286 cbi(PORTC, PCB_LCD_RW);
287 } while ((status & LCDF_BUSY) && retries);
289 return (retries != 0);
294 static inline void lcd_cmd(uint8_t cmd, uint8_t chip)
299 * A0 __\____________/__
301 * R/W __________________
305 * DATA --<============>--
318 static inline uint8_t lcd_read(uint8_t chip)
333 * DATA -------<=====>----
352 static inline void lcd_write(uint8_t c, uint8_t chip)
361 * R/W __________________
365 * DATA -<==============>-
381 * Set LCD contrast PWM.
383 void lcd_setPwm(int duty)
385 ASSERT(duty >= LCD_MIN_PWM);
386 ASSERT(duty <= LCD_MAX_PWM);
392 static void lcd_clear(void)
396 for (page = 0; page < LCD_PAGES; ++page)
398 lcd_cmd(LCD_CMD_COLADDR | 0, LCDF_E1 | LCDF_E2);
399 lcd_cmd(LCD_CMD_PAGEADDR | page, LCDF_E1 | LCDF_E2);
400 for (j = 0; j < LCD_PAGESIZE; j++)
401 lcd_write(0, LCDF_E1 | LCDF_E2);
406 static void lcd_writeRaster(const uint8_t *raster)
409 const uint8_t *right_raster;
411 CHECK_WALL(wall_before_raster);
412 CHECK_WALL(wall_after_raster);
414 for (page = 0; page < LCD_PAGES; ++page)
416 lcd_cmd(LCD_CMD_PAGEADDR | page, LCDF_E1 | LCDF_E2);
417 lcd_cmd(LCD_CMD_COLADDR | 0, LCDF_E1 | LCDF_E2);
419 /* Super optimized lamer loop */
420 right_raster = raster + LCD_PAGESIZE;
424 lcd_write(*raster++, LCDF_E1);
425 lcd_write(*right_raster++, LCDF_E2);
428 raster = right_raster;
433 * Update the LCD display with data from the provided bitmap.
435 void lcd_blitBitmap(Bitmap *bm)
438 lcd_writeRaster(bm->raster);
442 #if CONFIG_LCD_SOFTINT_REFRESH
444 static void lcd_refreshSoftint(void)
446 lcd_blit_bitmap(&lcd_bitmap);
447 timer_add(lcd_refresh_timer);
450 #endif /* CONFIG_LCD_SOFTINT_REFRESH */
454 * Initialize LCD subsystem.
456 * \note The PWM used for LCD contrast is initialized in drv/pwm.c
457 * because it is the same PWM used for output attenuation.
463 // FIXME: interrupts are already disabled when we get here?!?
465 IRQ_SAVE_DISABLE(flags);
467 PORTB |= BV(LCD_PB_A0);
468 DDRB |= BV(LCD_PB_A0);
470 PORTE &= ~(BV(LCD_PE_RW) | BV(LCD_PE_E1) | BV(LCD_PE_E2));
471 DDRE |= BV(LCD_PE_RW) | BV(LCD_PE_E1) | BV(LCD_PE_E2);
474 LCD_RESET_PORT |= BV(LCD_RESET_BIT);
475 LCD_RESET_DDR |= BV(LCD_RESET_BIT);
478 LCD_RESET_PORT &= ~BV(LCD_RESET_BIT);
481 LCD_RESET_PORT |= BV(LCD_RESET_BIT);
484 * Data bus is in output state most of the time:
485 * LCD r/w functions assume it is left in output state
489 // Wait for RST line to stabilize at Vcc.
492 IRQ_SAVE_DISABLE(flags);
494 lcd_cmd(LCD_CMD_RESET, LCDF_E1 | LCDF_E2);
495 lcd_cmd(LCD_CMD_DISPLAY_ON, LCDF_E1 | LCDF_E2);
496 lcd_cmd(LCD_CMD_STARTLINE | 0, LCDF_E1 | LCDF_E2);
498 /* Initialize anti-corruption walls for raster */
499 INIT_WALL(wall_before_raster);
500 INIT_WALL(wall_after_raster);
505 lcd_setpwm(LCD_DEF_PWM);
507 gfx_bitmapInit(&lcd_bitmap, lcd_raster, LCD_WIDTH, LCD_HEIGHT);
508 gfx_bitmapClear(&lcd_bitmap);
510 #if CONFIG_LCD_SOFTINT_REFRESH
512 /* Init IRQ driven LCD refresh */
513 lcd_refresh_timer = timer_new();
514 ASSERT(lcd_refresh_timer != NULL);
515 INITEVENT_INT(&lcd_refresh_timer->expire, (Hook)lcd_refresh_softint, 0);
516 lcd_refresh_timer->delay = LCD_REFRESH_INTERVAL;
517 timer_add(lcd_refresh_timer);
519 #endif /* CONFIG_LCD_SOFTINT_REFRESH */