diff options
Diffstat (limited to 'firmware/target/arm/as3525/sansa-clip/lcd-ssd1303.c')
-rw-r--r-- | firmware/target/arm/as3525/sansa-clip/lcd-ssd1303.c | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/firmware/target/arm/as3525/sansa-clip/lcd-ssd1303.c b/firmware/target/arm/as3525/sansa-clip/lcd-ssd1303.c new file mode 100644 index 0000000000..4ae13a5fcc --- /dev/null +++ b/firmware/target/arm/as3525/sansa-clip/lcd-ssd1303.c @@ -0,0 +1,312 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (C) 2002 by Alan Korr + * Copyright (C) 2008 François Dinel + * Copyright (C) 2008 Rafaël Carré + * + * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ +#include "config.h" + +#include "hwcompat.h" +#include "kernel.h" +#include "lcd.h" +#include "system.h" +#include "cpu.h" +#include "string.h" + +/*** AS3525 specifics ***/ +#include "as3525.h" + +/*** definitions ***/ + +#define LCD_SET_LOWER_COLUMN_ADDRESS ((char)0x00) +#define LCD_SET_HIGHER_COLUMN_ADDRESS ((char)0x10) +#define LCD_SET_DISPLAY_START_LINE ((char)0x40) +#define LCD_SET_CONTRAST_CONTROL_REGISTER ((char)0x81) +#define LCD_SET_SEGMENT_REMAP ((char)0xA0) +#define LCD_SET_SEGMENT_REMAP_INV ((char)0xA1) +#define LCD_SET_ENTIRE_DISPLAY_OFF ((char)0xA4) +#define LCD_SET_ENTIRE_DISPLAY_ON ((char)0xA5) +#define LCD_SET_NORMAL_DISPLAY ((char)0xA6) +#define LCD_SET_REVERSE_DISPLAY ((char)0xA7) +#define LCD_SET_MULTIPLEX_RATIO ((char)0xA8) +#define LCD_SET_DC_DC ((char)0xAD) +#define LCD_SET_DC_DC_PART2 ((char)0x8A) +#define LCD_SET_DISPLAY_OFF ((char)0xAE) +#define LCD_SET_DISPLAY_ON ((char)0xAF) +#define LCD_SET_PAGE_ADDRESS ((char)0xB0) +#define LCD_SET_COM_OUTPUT_SCAN_DIRECTION ((char)0xC0) +#define LCD_SET_COM_OUTPUT_SCAN_DIRECTION_INV ((char)0xC8) +#define LCD_SET_DISPLAY_CLOCK_AND_OSC_FREQ ((char)0xD5) +#define LCD_SET_VCOM_DESELECT_LEVEL ((char)0xDB) +#define LCD_SET_PRECHARGE_PERIOD ((char)0xD9) +#define LCD_NOP ((char)0xE3) + +/* LCD command codes */ +#define LCD_CNTL_CONTRAST 0x81 /* Contrast */ +#define LCD_CNTL_OUTSCAN 0xc8 /* Output scan direction */ +#define LCD_CNTL_SEGREMAP 0xa1 /* Segment remap */ +#define LCD_CNTL_DISPON 0xaf /* Display on */ + +#define LCD_CNTL_PAGE 0xb0 /* Page address */ +#define LCD_CNTL_HIGHCOL 0x10 /* Upper column address */ +#define LCD_CNTL_LOWCOL 0x00 /* Lower column address */ + +/* DBOP initialisation, do what OF does */ +static void ams3525_dbop_init(void) +{ + int clkdiv = 4 - 1; + + CGU_DBOP |= (1<<3) /* clk enable */ | clkdiv /* clkdiv: 3 bits */ ; + + GPIOB_AFSEL = 0x08; /* DBOP on pin 3 */ + GPIOC_AFSEL = 0x0f; /* DBOP on pins 3:0 */ + + DBOP_CTRL = 0x51008; + DBOP_TIMPOL_01 = 0x6E167; + DBOP_TIMPOL_23 = 0xA167E06F; +} + +void lcd_write_command(int byte) +{ + /* unset D/C# (data or command) */ + GPIOA_PIN(5) = 0; + + /* Write command */ + DBOP_DOUT = (byte << 8) | byte; + + /* While push fifo is not empty */ + while ((DBOP_STAT & (1<<10)) == 0) + ; +} + +void lcd_write_data(const fb_data* p_bytes, int count) +{ + /* set D/C# (data or command) */ + GPIOA_PIN(5) = (1<<5); + + while (count--) + { + /* Write pixels */ + DBOP_DOUT = (*p_bytes << 8) | *p_bytes; + + p_bytes++; /* next packed pixels */ + + /* While push fifo is not empty */ + while ((DBOP_STAT & (1<<10)) == 0) + ; + } +} + + +/** globals **/ + +static int xoffset; /* needed for flip */ +static bool display_on; /* used by lcd_enable */ + +/*** hardware configuration ***/ + +int lcd_default_contrast(void) +{ + return 0x1f; +} + +void lcd_set_contrast(int val) +{ + lcd_write_command(LCD_CNTL_CONTRAST); + lcd_write_command(val); +} + +void lcd_set_invert_display(bool yesno) +{ + if (yesno) + lcd_write_command(LCD_SET_REVERSE_DISPLAY); + else + lcd_write_command(LCD_SET_NORMAL_DISPLAY); +} + +/* turn the display upside down (call lcd_update() afterwards) */ +void lcd_set_flip(bool yesno) +{ + (void)yesno; + /* TODO */ +} + +void lcd_enable(bool enable) +{ + if( (display_on = enable) ) /* simple '=' is not a typo ! */ + lcd_write_command(LCD_SET_DISPLAY_ON); + else + lcd_write_command(LCD_SET_DISPLAY_OFF); +} + +bool lcd_enabled(void) +{ + return display_on; +} + + +/* LCD init, largely based on what OF does */ +void lcd_init_device(void) +{ + int i; +#define LCD_FULLSCREEN (128+4) + fb_data p_bytes[LCD_FULLSCREEN]; /* framebuffer used to clear the screen */ + + ams3525_dbop_init(); + + GPIOA_DIR |= 0x33; /* pins 5:4 and 1:0 out */ + GPIOB_DIR |= 0x60; /* pin 6:5 out */ + + GPIOA_PIN(1) = (1<<1); + GPIOA_PIN(0) = (1<<0); + GPIOA_PIN(4) = 0; + GPIOB_PIN(5) = 0; + GPIOB_PIN(6) = (1<<6); + + /* Set display clock (divide ratio = 1) and oscillator frequency (1) */ + lcd_write_command(LCD_SET_DISPLAY_CLOCK_AND_OSC_FREQ); + lcd_write_command(0x10); + + /* Set VCOM deselect level to 0.76V */ + lcd_write_command(LCD_SET_VCOM_DESELECT_LEVEL); + lcd_write_command(0x34); + + /* Set pre-charge period (p1period is 2 dclk and p2period is 5 dclk) */ + lcd_write_command(LCD_SET_PRECHARGE_PERIOD); + lcd_write_command(0x25); + + /* Set contrast register to 12% */ + lcd_set_contrast(lcd_default_contrast()); + + /* Disable DC-DC */ + lcd_write_command(LCD_SET_DC_DC); + lcd_write_command(LCD_SET_DC_DC_PART2/*|0*/); + + /* Set starting line as 0 */ + lcd_write_command(LCD_SET_DISPLAY_START_LINE /*|(0 & 0x3f)*/); + + /* Column 131 is remapped to SEG0 */ + lcd_write_command(LCD_SET_SEGMENT_REMAP_INV); + + /* Invert COM scan direction (N-1 to 0) */ + lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION_INV); + + /* Set normal display mode (not every pixel ON) */ + lcd_write_command(LCD_SET_ENTIRE_DISPLAY_OFF); + + /* Set normal display mode (not inverted) */ + lcd_write_command(LCD_SET_NORMAL_DISPLAY); + + /* Clear whole framebuffer, including "overscan" + * We don't need to handle that out of screen columns in lcd_clear_display() + * since we will never write into it anymore + */ + lcd_write_command (LCD_SET_HIGHER_COLUMN_ADDRESS /*| 0*/); + lcd_write_command (LCD_SET_LOWER_COLUMN_ADDRESS /*| 0*/); + + memset(p_bytes, 0, sizeof(p_bytes)); /* fills with 0 : pixel off */ + + for(i = 0; i < 8; i++) + { + lcd_write_command (LCD_SET_PAGE_ADDRESS | (i /*& 0xf*/)); + lcd_write_data(p_bytes, LCD_FULLSCREEN /* overscan */); + } + + lcd_update(); +} + +/*** Update functions ***/ + +/* Performance function that works with an external buffer + note that by and bheight are in 8-pixel units! */ +void lcd_blit_mono(const unsigned char *data, int x, int by, int width, + int bheight, int stride) +{ + /* Copy display bitmap to hardware */ + while (bheight--) + { + lcd_write_command (LCD_CNTL_PAGE | (by++ & 0xf)); + lcd_write_command (LCD_CNTL_HIGHCOL | (((x+2+xoffset)>>4) & 0xf)); + lcd_write_command (LCD_CNTL_LOWCOL | ((x+2+xoffset) & 0xf)); + + lcd_write_data(data, width); + data += stride; + } +} + + +/* Performance function that works with an external buffer + note that by and bheight are in 8-pixel units! */ +void lcd_blit_grey_phase(unsigned char *values, unsigned char *phases, + int x, int by, int width, int bheight, int stride) +{ + (void)values; + (void)phases; + (void)x; + (void)by; + (void)width; + (void)bheight; + (void)stride; +} + +/* Update the display. + This must be called after all other LCD functions that change the display. */ +void lcd_update(void) ICODE_ATTR; +void lcd_update(void) +{ + int y; + + /* Copy display bitmap to hardware */ + for (y = 0; y < LCD_FBHEIGHT; y++) + { + lcd_write_command (LCD_CNTL_PAGE | (y & 0xf)); + lcd_write_command (LCD_CNTL_HIGHCOL | (((xoffset+2) >> 4) & 0xf)); + lcd_write_command (LCD_CNTL_LOWCOL | ((xoffset+2) & 0xf)); + + lcd_write_data (lcd_framebuffer[y], LCD_WIDTH); + } +} + +/* Update a fraction of the display. */ +void lcd_update_rect(int, int, int, int) ICODE_ATTR; +void lcd_update_rect(int x, int y, int width, int height) +{ + int ymax; + + /* The Y coordinates have to work on even 8 pixel rows */ + ymax = (y + height-1) >> 3; + y >>= 3; + + if(x + width > LCD_WIDTH) + width = LCD_WIDTH - x; + if (width <= 0) + return; /* nothing left to do, 0 is harmful to lcd_write_data() */ + if(ymax >= LCD_FBHEIGHT) + ymax = LCD_FBHEIGHT-1; + + /* Copy specified rectange bitmap to hardware */ + for (; y <= ymax; y++) + { + lcd_write_command (LCD_CNTL_PAGE | (y & 0xf)); + lcd_write_command (LCD_CNTL_HIGHCOL | (((x+2+xoffset) >> 4) & 0xf)); + lcd_write_command (LCD_CNTL_LOWCOL | ((x+2+xoffset) & 0xf)); + + lcd_write_data (&lcd_framebuffer[y][x], width); + } +} |