Hello
The following patch adds support for the Epson 156x series of graphical displays.
These displays are serial and unsuitable for using a normal framebuffer console on them.
Regards
Pantelis
drivers/Makefile | 2 drivers/sed156x.c | 566 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ include/sed156x.h | 42 ++++ 3 files changed, 609 insertions(+), 1 deletion(-)
diff -ruNb u-boot-original/drivers/Makefile u-boot-display/drivers/Makefile --- u-boot-original/drivers/Makefile 2004-03-30 14:37:28.713923728 +0300 +++ u-boot-display/drivers/Makefile 2004-03-30 15:39:52.105841656 +0300 @@ -43,7 +43,7 @@ smc91111.o smiLynxEM.o status_led.o sym53c8xx.o \ ti_pci1410a.o tigon3.o w83c553f.o omap1510_i2c.o \ usbdcore.o usbdcore_ep0.o usbdcore_omap1510.o usbtty.o \ - videomodes.o + videomodes.o sed156x.o
all: $(LIB)
diff -ruNb u-boot-original/drivers/sed156x.c u-boot-display/drivers/sed156x.c --- u-boot-original/drivers/sed156x.c 1970-01-01 02:00:00.000000000 +0200 +++ u-boot-display/drivers/sed156x.c 2004-03-30 15:39:52.105841656 +0300 @@ -0,0 +1,566 @@ +/* + * (C) Copyright 2003 + * + * Pantelis Antoniou panto@intracom.gr + * Intracom S.A. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program 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 of + * the License, or (at your option) any later version. + * + * This program 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 this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <watchdog.h> + +#include <sed156x.h> + +#ifdef CONFIG_SED156X + +/* configure according to the selected display */ +#if defined(CONFIG_SED156X_PG12864Q) +#define LCD_WIDTH 128 +#define LCD_HEIGHT 64 +#define LCD_LINES 64 +#define LCD_PAGES 9 +#define LCD_COLUMNS 132 +#else +#error Unsupported SED156x configuration +#endif + +/* include the font data */ +#include <video_font.h> + +#if VIDEO_FONT_WIDTH != 8 || VIDEO_FONT_HEIGHT != 16 +#error Expecting VIDEO_FONT_WIDTH == 8 && VIDEO_FONT_HEIGHT == 16 +#endif + +#define LCD_BYTE_WIDTH (LCD_WIDTH / 8) +#define VIDEO_FONT_BYTE_WIDTH (VIDEO_FONT_WIDTH / 8) + +#define LCD_TEXT_WIDTH (LCD_WIDTH / VIDEO_FONT_WIDTH) +#define LCD_TEXT_HEIGHT (LCD_HEIGHT / VIDEO_FONT_HEIGHT) + +#define LCD_BYTE_LINESZ (LCD_BYTE_WIDTH * VIDEO_FONT_HEIGHT) + +const int sed156x_text_width = LCD_TEXT_WIDTH; +const int sed156x_text_height = LCD_TEXT_HEIGHT; + +/**************************************************************************************/ + +#define SED156X_SPI_RXD() (SED156X_SPI_RXD_PORT & SED156X_SPI_RXD_MASK) + +#define SED156X_SPI_TXD(x) \ + do { \ + if (x) \ + SED156X_SPI_TXD_PORT |= SED156X_SPI_TXD_MASK; \ + else \ + SED156X_SPI_TXD_PORT &= ~SED156X_SPI_TXD_MASK; \ + } while(0) + +#define SED156X_SPI_CLK(x) \ + do { \ + if (x) \ + SED156X_SPI_CLK_PORT |= SED156X_SPI_CLK_MASK; \ + else \ + SED156X_SPI_CLK_PORT &= ~SED156X_SPI_CLK_MASK; \ + } while(0) + +#define SED156X_SPI_CLK_TOGGLE() (SED156X_SPI_CLK_PORT ^= SED156X_SPI_CLK_MASK) + +#define SED156X_SPI_BIT_DELAY() /* no delay */ + +#define SED156X_CS(x) \ + do { \ + if (x) \ + SED156X_CS_PORT |= SED156X_CS_MASK; \ + else \ + SED156X_CS_PORT &= ~SED156X_CS_MASK; \ + } while(0) + +#define SED156X_A0(x) \ + do { \ + if (x) \ + SED156X_A0_PORT |= SED156X_A0_MASK; \ + else \ + SED156X_A0_PORT &= ~SED156X_A0_MASK; \ + } while(0) + +/**************************************************************************************/ + +/*** LCD Commands ***/ + +#define LCD_ON 0xAF /* Display ON */ +#define LCD_OFF 0xAE /* Display OFF */ +#define LCD_LADDR 0x40 /* Display start line set + (6-bit) address */ +#define LCD_PADDR 0xB0 /* Page address set + (4-bit) page */ +#define LCD_CADRH 0x10 /* Column address set upper + (4-bit) column hi */ +#define LCD_CADRL 0x00 /* Column address set lower + (4-bit) column lo */ +#define LCD_ADC_NRM 0xA0 /* ADC select Normal */ +#define LCD_ADC_REV 0xA1 /* ADC select Reverse */ +#define LCD_DSP_NRM 0xA6 /* LCD display Normal */ +#define LCD_DSP_REV 0xA7 /* LCD display Reverse */ +#define LCD_DPT_NRM 0xA4 /* Display all points Normal */ +#define LCD_DPT_ALL 0xA5 /* Display all points ON */ +#define LCD_BIAS9 0xA2 /* LCD bias set 1/9 */ +#define LCD_BIAS7 0xA3 /* LCD bias set 1/7 */ +#define LCD_CAINC 0xE0 /* Read/modify/write */ +#define LCD_CAEND 0xEE /* End */ +#define LCD_RESET 0xE2 /* Reset */ +#define LCD_C_NRM 0xC0 /* Common output mode select Normal direction */ +#define LCD_C_RVS 0xC8 /* Common output mode select Reverse direction */ +#define LCD_PWRMD 0x28 /* Power control set + (3-bit) mode */ +#define LCD_RESRT 0x20 /* V5 v. reg. int. resistor ratio set + (3-bit) ratio */ +#define LCD_EVSET 0x81 /* Electronic volume mode set + byte = (6-bit) volume */ +#define LCD_SIOFF 0xAC /* Static indicator OFF */ +#define LCD_SION 0xAD /* Static indicator ON + byte = (2-bit) mode */ +#define LCD_NOP 0xE3 /* NOP */ +#define LCD_TEST 0xF0 /* Test/Test mode reset (Note: *DO NOT USE*) */ + +/*------------------------------------------------------------------------------- + Compound commands + ------------------------------------------------------------------------------- + Command Description Commands + ---------- ------------------------ ------------------------------------- + POWS_ON POWER SAVER ON command LCD_OFF, LCD_D_ALL + POWS_OFF POWER SAVER OFF command LCD_D_NRM + SLEEPON SLEEP mode LCD_SIOFF, POWS_ON + SLEEPOFF SLEEP mode cancel LCD_D_NRM, LCD_SION, LCD_SIS_??? + STDBYON STAND BY mode LCD_SION, POWS_ON + STDBYOFF STAND BY mode cancel LCD_D_NRM + -------------------------------------------------------------------------------*/ + +/*** LCD various parameters ***/ +#define LCD_PPB 8 /* Pixels per byte (display is B/W, 1 bit per pixel) */ + +/*** LCD Status byte masks ***/ +#define LCD_S_BUSY 0x80 /* Status Read - BUSY mask */ +#define LCD_S_ADC 0x40 /* Status Read - ADC mask */ +#define LCD_S_ONOFF 0x20 /* Status Read - ON/OFF mask */ +#define LCD_S_RESET 0x10 /* Status Read - RESET mask */ + +/*** LCD commands parameter masks ***/ +#define LCD_M_LADDR 0x3F /* Display start line (6-bit) address mask */ +#define LCD_M_PADDR 0x0F /* Page address (4-bit) page mask */ +#define LCD_M_CADRH 0x0F /* Column address upper (4-bit) column hi mask */ +#define LCD_M_CADRL 0x0F /* Column address lower (4-bit) column lo mask */ +#define LCD_M_PWRMD 0x07 /* Power control (3-bit) mode mask */ +#define LCD_M_RESRT 0x07 /* V5 v. reg. int. resistor ratio (3-bit) ratio mask */ +#define LCD_M_EVSET 0x3F /* Electronic volume mode byte (6-bit) volume mask */ +#define LCD_M_SION 0x03 /* Static indicator ON (2-bit) mode mask */ + +/*** LCD Power control cirquits control masks ***/ +#define LCD_PWRBSTR 0x04 /* Power control mode - Booster cirquit ON */ +#define LCD_PWRVREG 0x02 /* Power control mode - Voltage regulator cirquit ON */ +#define LCD_PWRVFOL 0x01 /* Power control mode - Voltage follower cirquit ON */ + +/*** LCD Static indicator states ***/ +#define LCD_SIS_OFF 0x00 /* Static indicator register set - OFF state */ +#define LCD_SIS_BL 0x01 /* Static indicator register set - 1s blink state */ +#define LCD_SIS_RBL 0x02 /* Static indicator register set - .5s rapid blink state */ +#define LCD_SIS_ON 0x03 /* Static indicator register set - constantly on state */ + +/*** LCD functions special parameters (commands) ***/ +#define LCD_PREVP 0x80 /* Page number for moving to previous */ +#define LCD_NEXTP 0x81 /* or next page */ +#define LCD_ERR_P 0xFF /* Error in page number */ + +/*** LCD initialization settings ***/ +#define LCD_BIAS LCD_BIAS9 /* Bias: 1/9 */ +#define LCD_ADCMODE LCD_ADC_NRM /* ADC mode: normal */ +#define LCD_COMDIR LCD_C_NRM /* Common output mode: normal */ +#define LCD_RRATIO 0 /* Resistor ratio: 0 */ +#define LCD_CNTRST 0x1C /* electronic volume: 1Ch */ +#define LCD_POWERM (LCD_PWRBSTR | LCD_PWRVREG | LCD_PWRVFOL) /* Power mode: All on */ + +/**************************************************************************************/ + +static inline unsigned int sed156x_transfer(unsigned int val) +{ + unsigned int rx; + int b; + + rx = 0; b = 8; + while (--b >= 0) { + SED156X_SPI_TXD(val & 0x80); + val <<= 1; + SED156X_SPI_CLK_TOGGLE(); + SED156X_SPI_BIT_DELAY(); + rx <<= 1; + if (SED156X_SPI_RXD()) + rx |= 1; + SED156X_SPI_CLK_TOGGLE(); + SED156X_SPI_BIT_DELAY(); + } + + return rx; +} + +unsigned int sed156x_data_transfer(unsigned int val) +{ + unsigned int rx; + + SED156X_SPI_CLK(1); + SED156X_CS(0); + SED156X_A0(1); + + rx = sed156x_transfer(val); + + SED156X_CS(1); + + return rx; +} + +void sed156x_data_block_transfer(const u8 *p, int size) +{ + SED156X_SPI_CLK(1); + SED156X_CS(0); + SED156X_A0(1); + + while (--size >= 0) + sed156x_transfer(*p++); + + SED156X_CS(1); +} + +unsigned int sed156x_cmd_transfer(unsigned int val) +{ + unsigned int rx; + + SED156X_SPI_CLK(1); + SED156X_CS(0); + SED156X_A0(0); + + rx = sed156x_transfer(val); + + SED156X_CS(1); + SED156X_A0(1); + + return rx; +} + +/******************************************************************************/ + +static u8 hw_screen[LCD_PAGES][LCD_COLUMNS]; +static u8 last_hw_screen[LCD_PAGES][LCD_COLUMNS]; +static u8 sw_screen[LCD_BYTE_WIDTH * LCD_HEIGHT]; + +void sed156x_sync(void) +{ + int i, j, last_page; + u8 *d; + const u8 *s, *e, *b, *r; + u8 v0, v1, v2, v3, v4, v5, v6, v7; + + /* copy and rotate sw_screen to hw_screen */ + for (i = 0; i < LCD_HEIGHT / 8; i++) { + + d = &hw_screen[i][0]; + s = &sw_screen[LCD_BYTE_WIDTH * 8 * i + LCD_BYTE_WIDTH - 1]; + + for (j = 0; j < LCD_WIDTH / 8; j++) { + + v0 = s[0 * LCD_BYTE_WIDTH]; + v1 = s[1 * LCD_BYTE_WIDTH]; + v2 = s[2 * LCD_BYTE_WIDTH]; + v3 = s[3 * LCD_BYTE_WIDTH]; + v4 = s[4 * LCD_BYTE_WIDTH]; + v5 = s[5 * LCD_BYTE_WIDTH]; + v6 = s[6 * LCD_BYTE_WIDTH]; + v7 = s[7 * LCD_BYTE_WIDTH]; + + d[0] = ((v7 & 0x01) << 7) | + ((v6 & 0x01) << 6) | + ((v5 & 0x01) << 5) | + ((v4 & 0x01) << 4) | + ((v3 & 0x01) << 3) | + ((v2 & 0x01) << 2) | + ((v1 & 0x01) << 1) | + (v0 & 0x01) ; + + d[1] = ((v7 & 0x02) << 6) | + ((v6 & 0x02) << 5) | + ((v5 & 0x02) << 4) | + ((v4 & 0x02) << 3) | + ((v3 & 0x02) << 2) | + ((v2 & 0x02) << 1) | + ((v1 & 0x02) << 0) | + ((v0 & 0x02) >> 1) ; + + d[2] = ((v7 & 0x04) << 5) | + ((v6 & 0x04) << 4) | + ((v5 & 0x04) << 3) | + ((v4 & 0x04) << 2) | + ((v3 & 0x04) << 1) | + (v2 & 0x04) | + ((v1 & 0x04) >> 1) | + ((v0 & 0x04) >> 2) ; + + d[3] = ((v7 & 0x08) << 4) | + ((v6 & 0x08) << 3) | + ((v5 & 0x08) << 2) | + ((v4 & 0x08) << 1) | + (v3 & 0x08) | + ((v2 & 0x08) >> 1) | + ((v1 & 0x08) >> 2) | + ((v0 & 0x08) >> 3) ; + + d[4] = ((v7 & 0x10) << 3) | + ((v6 & 0x10) << 2) | + ((v5 & 0x10) << 1) | + (v4 & 0x10) | + ((v3 & 0x10) >> 1) | + ((v2 & 0x10) >> 2) | + ((v1 & 0x10) >> 3) | + ((v0 & 0x10) >> 4) ; + + d[5] = ((v7 & 0x20) << 2) | + ((v6 & 0x20) << 1) | + (v5 & 0x20) | + ((v4 & 0x20) >> 1) | + ((v3 & 0x20) >> 2) | + ((v2 & 0x20) >> 3) | + ((v1 & 0x20) >> 4) | + ((v0 & 0x20) >> 5) ; + + d[6] = ((v7 & 0x40) << 1) | + (v6 & 0x40) | + ((v5 & 0x40) >> 1) | + ((v4 & 0x40) >> 2) | + ((v3 & 0x40) >> 3) | + ((v2 & 0x40) >> 4) | + ((v1 & 0x40) >> 5) | + ((v0 & 0x40) >> 6) ; + + d[7] = (v7 & 0x80) | + ((v6 & 0x80) >> 1) | + ((v5 & 0x80) >> 2) | + ((v4 & 0x80) >> 3) | + ((v3 & 0x80) >> 4) | + ((v2 & 0x80) >> 5) | + ((v1 & 0x80) >> 6) | + ((v0 & 0x80) >> 7) ; + + d += 8; + s--; + } + } + + /* and now output only the differences */ + for (i = 0; i < LCD_PAGES; i++) { + + b = &hw_screen[i][0]; + e = &hw_screen[i][LCD_COLUMNS]; + + d = &last_hw_screen[i][0]; + s = b; + + last_page = -1; + + /* update only the differences */ + do { + while (s < e && *s == *d) { + s++; + d++; + } + if (s == e) + break; + r = s; + while (s < e && *s != *d) + *d++ = *s++; + + j = r - b; + + if (i != last_page) { + sed156x_cmd_transfer(LCD_PADDR | i); + last_page = i; + } + + sed156x_cmd_transfer(LCD_CADRH | ((j >> 4) & 0x0F)); + sed156x_cmd_transfer(LCD_CADRL | (j & 0x0F)); + sed156x_data_block_transfer(r, s - r); + + } while (s < e); + } + + /* + for (i = 0; i < LCD_PAGES; i++) { + sed156x_cmd_transfer(LCD_PADDR | i); + sed156x_cmd_transfer(LCD_CADRH | 0); + sed156x_cmd_transfer(LCD_CADRL | 0); + sed156x_data_block_transfer(&hw_screen[i][0], LCD_COLUMNS); + } + memcpy(last_hw_screen, hw_screen, sizeof(last_hw_screen)); + */ +} + +void sed156x_clear(void) +{ + memset(sw_screen, 0, sizeof(sw_screen)); +} + +void sed156x_output_at(int x, int y, const char *str, int size) +{ + int i, j; + u8 *p; + const u8 *s; + + if ((unsigned int)y >= LCD_TEXT_HEIGHT || (unsigned int)x >= LCD_TEXT_WIDTH) + return; + + p = &sw_screen[y * VIDEO_FONT_HEIGHT * LCD_BYTE_WIDTH + x * VIDEO_FONT_BYTE_WIDTH]; + + while (--size >= 0) { + + s = &video_fontdata[((int)*str++ & 0xff) * VIDEO_FONT_BYTE_WIDTH * VIDEO_FONT_HEIGHT]; + for (i = 0; i < VIDEO_FONT_HEIGHT; i++) { + for (j = 0; j < VIDEO_FONT_BYTE_WIDTH; j++) + *p++ = *s++; + p += LCD_BYTE_WIDTH - VIDEO_FONT_BYTE_WIDTH; + } + p -= (LCD_BYTE_LINESZ - VIDEO_FONT_BYTE_WIDTH); + + if (x >= LCD_TEXT_WIDTH) + break; + x++; + } +} + +void sed156x_reverse_at(int x, int y, int size) +{ + int i, j; + u8 *p; + + if ((unsigned int)y >= LCD_TEXT_HEIGHT || (unsigned int)x >= LCD_TEXT_WIDTH) + return; + + p = &sw_screen[y * VIDEO_FONT_HEIGHT * LCD_BYTE_WIDTH + x * VIDEO_FONT_BYTE_WIDTH]; + + while (--size >= 0) { + + for (i = 0; i < VIDEO_FONT_HEIGHT; i++) { + for (j = 0; j < VIDEO_FONT_BYTE_WIDTH; j++, p++) + *p = ~*p; + p += LCD_BYTE_WIDTH - VIDEO_FONT_BYTE_WIDTH; + } + p -= (LCD_BYTE_LINESZ - VIDEO_FONT_BYTE_WIDTH); + + if (x >= LCD_TEXT_WIDTH) + break; + x++; + } +} + +void sed156x_scroll_line(void) +{ + memmove(&sw_screen[0], + &sw_screen[LCD_BYTE_LINESZ], + LCD_BYTE_WIDTH * (LCD_HEIGHT - VIDEO_FONT_HEIGHT)); +} + +void sed156x_scroll(int dx, int dy) +{ + u8 *p1 = NULL, *p2 = NULL, *p3 = NULL; /* pacify gcc */ + int adx, ady, i, sz; + + adx = dx > 0 ? dx : -dx; + ady = dy > 0 ? dy : -dy; + + /* overscroll? erase everything */ + if (adx >= LCD_TEXT_WIDTH || ady >= LCD_TEXT_HEIGHT) { + memset(sw_screen, 0, sizeof(sw_screen)); + return; + } + + sz = LCD_BYTE_LINESZ * ady; + if (dy > 0) { + p1 = &sw_screen[0]; + p2 = &sw_screen[sz]; + p3 = &sw_screen[LCD_BYTE_WIDTH * LCD_HEIGHT - sz]; + } else if (dy < 0) { + p1 = &sw_screen[sz]; + p2 = &sw_screen[0]; + p3 = &sw_screen[0]; + } + + if (ady > 0) { + memmove(p1, p2, LCD_BYTE_WIDTH * LCD_HEIGHT - sz); + memset(p3, 0, sz); + } + + sz = VIDEO_FONT_BYTE_WIDTH * adx; + if (dx > 0) { + p1 = &sw_screen[0]; + p2 = &sw_screen[0] + sz; + p3 = &sw_screen[0] + LCD_BYTE_WIDTH - sz; + } else if (dx < 0) { + p1 = &sw_screen[0] + sz; + p2 = &sw_screen[0]; + p3 = &sw_screen[0]; + } + + /* xscroll */ + if (adx > 0) { + for (i = 0; i < LCD_HEIGHT; i++) { + memmove(p1, p2, LCD_BYTE_WIDTH - sz); + memset(p3, 0, sz); + p1 += LCD_BYTE_WIDTH; + p2 += LCD_BYTE_WIDTH; + p3 += LCD_BYTE_WIDTH; + } + } +} + +void sed156x_init(void) +{ + int i; + + SED156X_CS(1); + SED156X_A0(1); + + /* Send initialization commands to the LCD */ + sed156x_cmd_transfer(LCD_OFF); /* Turn display OFF */ + sed156x_cmd_transfer(LCD_BIAS); /* set the LCD Bias, */ + sed156x_cmd_transfer(LCD_ADCMODE); /* ADC mode, */ + sed156x_cmd_transfer(LCD_COMDIR); /* common output mode, */ + sed156x_cmd_transfer(LCD_RESRT | LCD_RRATIO); /* resistor ratio, */ + sed156x_cmd_transfer(LCD_EVSET); /* electronic volume, */ + sed156x_cmd_transfer(LCD_CNTRST); + sed156x_cmd_transfer(LCD_PWRMD | LCD_POWERM); /* and power mode */ + sed156x_cmd_transfer(LCD_PADDR | 0); /* cursor home */ + sed156x_cmd_transfer(LCD_CADRH | 0); + sed156x_cmd_transfer(LCD_CADRL | 0); + sed156x_cmd_transfer(LCD_LADDR | 0); /* and display start line */ + sed156x_cmd_transfer(LCD_DSP_NRM); /* LCD display Normal */ + + /* clear everything */ + memset(sw_screen, 0, sizeof(sw_screen)); + memset(hw_screen, 0, sizeof(hw_screen)); + memset(last_hw_screen, 0, sizeof(last_hw_screen)); + + for (i = 0; i < LCD_PAGES; i++) { + sed156x_cmd_transfer(LCD_PADDR | i); + sed156x_cmd_transfer(LCD_CADRH | 0); + sed156x_cmd_transfer(LCD_CADRL | 0); + sed156x_data_block_transfer(&hw_screen[i][0], LCD_COLUMNS); + } + + sed156x_clear(); + sed156x_sync(); + sed156x_cmd_transfer(LCD_ON); /* Turn display ON */ +} + +#endif diff -ruNb u-boot-original/include/sed156x.h u-boot-display/include/sed156x.h --- u-boot-original/include/sed156x.h 1970-01-01 02:00:00.000000000 +0200 +++ u-boot-display/include/sed156x.h 2004-03-30 15:39:52.106841504 +0300 @@ -0,0 +1,42 @@ +/* + * (C) Copyright 2004 + * + * Pantelis Antoniou panto@intracom.gr + * Intracom S.A. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program 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 of + * the License, or (at your option) any later version. + * + * This program 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 this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +/* Video support for Epson SED156x chipset(s) */ + +#ifndef SED156X_H +#define SED156X_H + +void sed156x_init(void); +void sed156x_clear(void); +void sed156x_output_at(int x, int y, const char *str, int size); +void sed156x_reverse_at(int x, int y, int size); +void sed156x_sync(void); +void sed156x_scroll(int dx, int dy); + +/* export display */ +extern const int sed156x_text_width; +extern const int sed156x_text_height; + +#endif