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rockbox/firmware/target/mips/ingenic_jz47xx/xduoo_x3/lcd-xduoo_x3.c
William Wilgus e18c2f3001 XduooX3 LCD tweaks #2 
Group commands for a bit more speed

bitdelay was not being inlined
lower bitdelay to 12 cycles

Clean-up magic numbers

Change-Id: Ifeb57a5532807a598f1ec5e1c55f03e4aa1e133f
2020-09-08 14:37:46 +00:00

601 lines
17 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2016 by Roman Stolyarov
* Copyright (C) 2020 by William Wilgus
*
* 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 "lcd.h"
#include "system.h"
#include "cpu.h"
#include "string.h"
#include "kernel.h"
/* LCD pins */
#define PIN_BL_EN (32*4+0)
#define PIN_LCD_D0 (32*2+2)
#define PIN_LCD_D1 (32*2+3)
#define PIN_LCD_D2 (32*2+4)
#define PIN_LCD_D3 (32*2+5)
#define PIN_LCD_D4 (32*2+6)
#define PIN_LCD_D5 (32*2+7)
#define PIN_LCD_D6 (32*2+12)
#define PIN_LCD_D7 (32*2+13)
#define PIN_LCD_RD (32*2+8)
#define PIN_LCD_DC (32*2+9)
#define PIN_LCD_CS (32*2+14)
#define PIN_LCD_RES (32*2+18)
#define PIN_LCD_WR (32*2+19)
/* LCD_PINS_MASK D0-D7 RD DC CS RES WR */
#define LCD_PINS_MASK 0x000C73FC
/* LCD_DATA_MASK D0-D7 */
#define LCD_DATA_MASK 0x000030FC
/* FRAMEBUF_TO_LCD_DATA -- translate data to match LCD data pins */
#define FRAMEBUF_TO_LCD_DATA(b) (((b & 0xC0) << 6) | ((b & 0x3F) << 2))
/* LCD setup codes */
#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_CHARGE_PUMP ((char)0x8D)
#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_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_OFFSET ((char)0xD3)
#define LCD_SET_DISPLAY_CLOCK_AND_OSC_FREQ ((char)0xD5)
#define LCD_SET_VCOM_HW_CONFIGURATION ((char)0xDA)
#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 */
#define LCD_COL_OFFSET 2 /* column offset */
#define BITDELAY() \
do { \
volatile unsigned int i = 12; \
__asm__ __volatile__ ( \
".set noreorder \n" \
"1: \n" \
"bne %0, $0, 1b \n" \
"addi %0, %0, -1 \n" \
".set reorder \n" \
: "=r" (i) \
: "0" (i) \
); \
} while (0)
void lcd_hw_init(void)
{
REG_GPIO_PXFUNC(2) = LCD_PINS_MASK; /* GPIO/INTERRUPT */
REG_GPIO_PXSELC(2) = LCD_PINS_MASK; /* GPIO */
REG_GPIO_PXPEC(2) = LCD_PINS_MASK; /* ENABLE PULLUP*/
REG_GPIO_PXDIRS(2) = LCD_PINS_MASK; /* OUTPUT */
REG_GPIO_PXDATS(2) = LCD_PINS_MASK; /* SET BIT */
REG_GPIO_PXSLS(2) = LCD_PINS_MASK; /* slew -- fast rate */
REG_GPIO_PXDS0C(2) = LCD_PINS_MASK; /* Low pin drive strength */
REG_GPIO_PXDS1C(2) = LCD_PINS_MASK;
REG_GPIO_PXDS2C(2) = LCD_PINS_MASK;
__gpio_clear_pin(PIN_LCD_RD); /* UNUSED */
__gpio_as_input(PIN_LCD_RD); /* UNUSED */
__gpio_clear_pin(PIN_BL_EN);
__gpio_as_output(PIN_BL_EN);
__gpio_clear_pin(PIN_LCD_RES);
udelay(1);
__gpio_set_pin(PIN_LCD_RES);
__gpio_clear_pin(PIN_LCD_CS);
__cpm_stop_lcd(); /* We don't use the LCD controller */
}
void lcd_write_command(int byte)
{
__gpio_clear_pin(PIN_LCD_DC);
REG_GPIO_PXDATC(2) = LCD_DATA_MASK;
REG_GPIO_PXDATS(2) = FRAMEBUF_TO_LCD_DATA(byte);
__gpio_clear_pin(PIN_LCD_WR);
BITDELAY();
__gpio_set_pin(PIN_LCD_WR);
BITDELAY();
}
static void lcd_write_cmd_triplet(int cmd1, int cmd2, int cmd3)
{
#if 0
lcd_write_command(cmd1);
lcd_write_command(cmd2);
lcd_write_command(cmd3);
#else
int command = LCD_DATA_MASK;
__gpio_clear_pin(PIN_LCD_DC);
REG_GPIO_PXDATC(2) = command;
command = FRAMEBUF_TO_LCD_DATA(cmd1);
REG_GPIO_PXDATS(2) = command;
__gpio_clear_pin(PIN_LCD_WR);
BITDELAY();
__gpio_set_pin(PIN_LCD_WR);
BITDELAY();
REG_GPIO_PXDATC(2) = command;
command = FRAMEBUF_TO_LCD_DATA(cmd2);
REG_GPIO_PXDATS(2) = command;
__gpio_clear_pin(PIN_LCD_WR);
BITDELAY();
__gpio_set_pin(PIN_LCD_WR);
BITDELAY();
REG_GPIO_PXDATC(2) = command;
command = FRAMEBUF_TO_LCD_DATA(cmd3);
REG_GPIO_PXDATS(2) = command;
__gpio_clear_pin(PIN_LCD_WR);
BITDELAY();
__gpio_set_pin(PIN_LCD_WR);
BITDELAY();
#endif
}
void lcd_write_data(const fb_data* p_bytes, int count)
{
int data = LCD_DATA_MASK;
__gpio_set_pin(PIN_LCD_DC);
while (count--)
{
REG_GPIO_PXDATC(2) = data;
data = FRAMEBUF_TO_LCD_DATA(*p_bytes);
p_bytes++;
REG_GPIO_PXDATS(2) = data;
__gpio_clear_pin(PIN_LCD_WR);
BITDELAY();
__gpio_set_pin(PIN_LCD_WR);
BITDELAY();
}
}
void lcd_enable_power(bool onoff)
{
if (onoff)
__gpio_set_pin(PIN_BL_EN);
else
__gpio_clear_pin(PIN_BL_EN);
}
/** globals **/
static bool display_on = false; /* used by lcd_enable */
/*** hardware configuration ***/
int lcd_default_contrast(void)
{
return DEFAULT_CONTRAST_SETTING;
}
void lcd_set_contrast(int val)
{
static int last_val = 0xFFFFFF;
if (val >= 0) /* brightness menu */
{
lcd_write_command(LCD_CNTL_CONTRAST);
lcd_write_command(val);
}
else if (val != last_val)
{
/* here we change the voltage level and drive times
* longer precharge = dimmer display
* higher voltage = shorter precharge required
*/
int precharge;
int vcomdsel;
switch (val)
{
case -9:
precharge = 0xFF;
vcomdsel = 0x10;
break;
case -8:
precharge = 0xF9;
vcomdsel = 0x10;
break;
case -7:
precharge = 0xF6;
vcomdsel = 0x20;
break;
default:
case -6:
precharge = 0xF1;
vcomdsel = 0x30;
break;
case -5:
precharge = 0xF1;
vcomdsel = 0x40;
break;
case -4:
precharge = 0x91;
vcomdsel = 0x50;
break;
case -3:
precharge = 0x61;
vcomdsel = 0x60;
break;
case -2:
precharge = 0x31;
vcomdsel = 0x65;
break;
case -1:
precharge = 0x11;
vcomdsel = 0x70;
break;
}
last_val = val;
lcd_enable(false);
/* Set pre-charge period */
lcd_write_command(LCD_SET_PRECHARGE_PERIOD);
lcd_write_command(precharge); /* VCC Generated by Internal DC/DC Circuit */
/* Set VCOM deselect level */
lcd_write_command(LCD_SET_VCOM_DESELECT_LEVEL);
lcd_write_command(vcomdsel);
lcd_enable(true);
}
}
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)
{
if (yesno)
{
lcd_write_command(LCD_SET_SEGMENT_REMAP);
lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION);
}
else
{
lcd_write_command(LCD_SET_SEGMENT_REMAP_INV);
lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION_INV);
}
}
#ifdef HAVE_LCD_ENABLE
void lcd_enable(bool enable)
{
if(display_on == enable)
return;
if( (display_on = enable) ) /* simple '=' is not a typo ! */
{
lcd_enable_power(enable);
lcd_write_command(LCD_SET_DISPLAY_ON);
send_event(LCD_EVENT_ACTIVATION, NULL);
}
else
{
lcd_write_command(LCD_SET_DISPLAY_OFF);
lcd_enable_power(enable);
REG_GPIO_PXDATC(2) = LCD_DATA_MASK;
}
}
bool lcd_active(void)
{
return display_on;
}
#endif
/* LCD init, largely based on what OF does */
void lcd_init_device(void)
{
int i;
lcd_hw_init();
/* Set display off */
lcd_write_command(LCD_SET_DISPLAY_OFF);
/* Set display clock and oscillator frequency */
lcd_write_command(LCD_SET_DISPLAY_CLOCK_AND_OSC_FREQ);
lcd_write_command(0x00); /* External clock Bits [0-3] for divider */
/* Set multiplex ratio*/
lcd_write_command(LCD_SET_MULTIPLEX_RATIO);
lcd_write_command(0x3F);
/* Set display offset */
lcd_write_command(LCD_SET_DISPLAY_OFFSET);
lcd_write_command(0x00);
/* Set starting line as 0 */
lcd_write_command(LCD_SET_DISPLAY_START_LINE);
/* Set charge pump */
lcd_write_command(LCD_SET_CHARGE_PUMP);
lcd_write_command(0x14); /* VCC Generated by Internal DC/DC Circuit */
/* 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 COM hardware configuration */
lcd_write_command(LCD_SET_VCOM_HW_CONFIGURATION);
lcd_write_command(0x12);
/* Set contrast control */
lcd_write_command(LCD_SET_CONTRAST_CONTROL_REGISTER);
lcd_write_command(0xCF); /* VCC Generated by Internal DC/DC Circuit */
/* Set pre-charge period */
lcd_write_command(LCD_SET_PRECHARGE_PERIOD);
lcd_write_command(0xF1); /* VCC Generated by Internal DC/DC Circuit */
/* Set VCOM deselect level */
lcd_write_command(LCD_SET_VCOM_DESELECT_LEVEL);
lcd_write_command(0x20);
/* 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);
fb_data p_bytes[LCD_WIDTH + 2 * LCD_COL_OFFSET];
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_WIDTH + 2 * LCD_COL_OFFSET);
}
lcd_enable(true);
lcd_update();
}
/*** Update functions ***/
/* returns LCD_CNTL_HIGHCOL or'd with higher 4 bits of
the 8-bit column address for the display data RAM.
*/
static inline int get_column_high_byte(const int x)
{
return (LCD_CNTL_HIGHCOL | (((x+LCD_COL_OFFSET) >> 4) & 0xf));
}
/* returns LCD_CNTL_LOWCOL or'd with lower 4 bits of
the 8-bit column address for the display data RAM.
*/
static inline int get_column_low_byte(const int x)
{
return (LCD_CNTL_LOWCOL | ((x+LCD_COL_OFFSET) & 0xf));
}
/* 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)
{
if(!display_on)
return;
const int column_high = get_column_high_byte(x);
const int column_low = get_column_low_byte(x);
/* Copy display bitmap to hardware */
while (bheight--)
{
lcd_write_cmd_triplet
(
(LCD_CNTL_PAGE | (by++ & 0xf)),
(column_high),
(column_low)
);
lcd_write_data(data, width);
data += stride;
}
}
#ifndef BOOTLOADER
/* Helper function for lcd_grey_phase_blit(). */
void lcd_grey_data(unsigned char *values, unsigned char *phases, int count) ICODE_ATTR;
void lcd_grey_data(unsigned char *values, unsigned char *phases, int count)
{
unsigned long ltmp;
unsigned long *lval = (unsigned long *)values;
unsigned long *lpha = (unsigned long *)phases;
const unsigned long mask = 0x80808080;
int data = LCD_DATA_MASK;
__gpio_set_pin(PIN_LCD_DC);
while(count--)
{
/* calculate disp data from phase we only use the last byte (8bits) */
ltmp = mask & lpha[0]; // ltmp= 3.......2.......1.......0.......
ltmp |= (mask & lpha[1]) >> 4; // ltmp= 7.......6.......5.......4.......
/* phase0 | phase1 >> 4 */ // ltmp= 3...7...2...6...1...5...0...4...
ltmp |= ltmp >> 9; // ltmp= 3...7...23..67..12..56..01..45..
ltmp |= ltmp >> 9; // ltmp= 3...7...23..67..123.567.012.456.
ltmp |= ltmp >> 9; // ltmp= 3...7...23..67..123.567.01234567
/* update the phases */
lpha[0] = lval[0] + (lpha[0] & ~mask);
lpha[1] = lval[1] + (lpha[1] & ~mask);
REG_GPIO_PXDATC(2) = data;
data = FRAMEBUF_TO_LCD_DATA(ltmp);
REG_GPIO_PXDATS(2) = data;
__gpio_clear_pin(PIN_LCD_WR);
BITDELAY();
__gpio_set_pin(PIN_LCD_WR);
/*BITDELAY(); //enough instructions above to satisfy data hold time */
lpha+=2;
lval+=2;
}
}
/* 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)
{
static long last_tick = 0;
if(!display_on || TIME_BEFORE(current_tick, last_tick + 2))
return;
last_tick = current_tick;
const int column_high = get_column_high_byte(x);
const int column_low = get_column_low_byte(x);
stride <<= 3; /* 8 pixels per block */
/* Copy display bitmap to hardware */
while (bheight--)
{
lcd_write_cmd_triplet
(
(LCD_CNTL_PAGE | (by++ & 0xf)),
(column_high),
(column_low)
);
lcd_grey_data(values, phases, width);
values += stride;
phases += stride;
}
}
#endif
/* 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;
if(!display_on)
return;
const int column_high = get_column_high_byte(0);
const int column_low = get_column_low_byte(0);
/* Copy display bitmap to hardware */
for (y = 0; y < LCD_FBHEIGHT; y++)
{
lcd_write_cmd_triplet
(
(LCD_CNTL_PAGE | (y & 0xf)),
(column_high),
(column_low)
);
lcd_write_data (FBADDR(0, 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;
if(!display_on)
return;
const int column_high = get_column_high_byte(x);
const int column_low = get_column_low_byte(x);
/* The Y coordinates have to work on even 8 pixel rows */
if (x < 0)
{
width += x;
x = 0;
}
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 (y < 0)
{
height += y;
y = 0;
}
if (y + height > LCD_HEIGHT)
height = LCD_HEIGHT - y;
if (height <= 0)
return; /* nothing left to do */
ymax = (y + height-1) >> 3;
y >>= 3;
/* Copy specified rectange bitmap to hardware */
for (; y <= ymax; y++)
{
lcd_write_cmd_triplet
(
(LCD_CNTL_PAGE | (y & 0xf)),
(column_high),
(column_low)
);
lcd_write_data (FBADDR(x,y), width);
}
}
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