mirror of
https://github.com/Rockbox/rockbox.git
synced 2026-07-10 13:29:52 -04:00
32b8af9840
Now that we have a datasheet for the type 1 display controller it turns out the gamma correction was not being applied the screen looks much better with it actually applied also lowers display refresh from 120 HZ to 90 Hz and applied a mentioned sleep mode (0x14) to save some power Adds comments for the LCD commands ala type 0 Change-Id: I2d72df4d24b8bf9f3627bdb96ec9ce43ddd8b10a
477 lines
14 KiB
C
477 lines
14 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2011 Bertrik Sikken
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "cpu.h"
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#include "system.h"
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#include "kernel.h"
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#include "lcd.h"
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#include "lcd-target.h"
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/* the detected lcd type (0 or 1) */
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static int lcd_type;
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/* set by lcd_set_flip(): when true the panel is rotated 180 degrees via the
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controller's GRAM write direction (see lcd_set_flip and lcd_setup_rect) */
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static bool lcd_flipped = false;
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#ifdef HAVE_LCD_ENABLE
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/* whether the lcd is currently enabled or not */
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static bool lcd_enabled;
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#endif
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static void ssp_set_prescaler(unsigned int prescaler)
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{
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int oldlevel = disable_interrupt_save(IRQ_FIQ_STATUS);
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/* must be on to write regs */
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bool ssp_enabled = bitset32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE) &
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CGU_SSP_CLOCK_ENABLE;
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SSP_CPSR = prescaler;
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if (!ssp_enabled) /* put it back how we found it */
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bitclr32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE);
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restore_irq(oldlevel);
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}
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/* initialises the host lcd hardware, returns the lcd type */
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static int lcd_hw_init(void)
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{
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/* configure SSP */
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bitset32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE);
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ssp_set_prescaler(AS3525_SSP_PRESCALER); /* OF = 0x8 */
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SSP_CR0 = (0 << 8) | /* SCR, serial clock rate divider = 1 */
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(1 << 7) | /* SPH, phase = 1 */
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(1 << 6) | /* SPO, polarity = 1 */
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(0 << 4) | /* FRF, frame format = motorola SPI */
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(7 << 0); /* DSS, data size select = 8 bits */
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SSP_CR1 = (1 << 3) | /* SOD, slave output disable = 1 */
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(0 << 2) | /* MS, master/slave = master */
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(1 << 1) | /* SSE, synchronous serial port enabled = true */
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(0 << 0); /* LBM, loopback mode = normal */
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SSP_IMSC &= ~0xF; /* disable interrupts */
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SSP_DMACR &= ~0x3; /* disable DMA */
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/* GPIO A3 is ??? but needs to be set */
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GPIOA_DIR |= (1 << 3);
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GPIOA_PIN(3) = (1 << 3);
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/* configure GPIO B2 (lcd D/C#) as output */
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GPIOB_DIR |= (1<<2);
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/* configure GPIO B3 (lcd type detect) as input */
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GPIOB_DIR &= ~(1<<3);
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/* configure GPIO A5 (lcd reset#) as output and perform lcd reset */
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GPIOA_DIR |= (1 << 5);
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GPIOA_PIN(5) = 0;
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sleep(HZ * 50/1000);
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GPIOA_PIN(5) = (1 << 5);
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/* detect lcd type on GPIO B3 */
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return GPIOB_PIN(3) ? 1 : 0;
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}
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/* writes a command byte to the LCD */
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static void lcd_write_cmd(uint8_t byte)
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{
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/* wait until not busy */
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while (SSP_SR & (1<<4));
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/* LCD command mode */
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GPIOB_PIN(2) = 0;
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/* write data */
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SSP_DATA = byte;
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/* wait until not busy */
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while (SSP_SR & (1<<4));
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/* LCD data mode */
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GPIOB_PIN(2) = (1 << 2);
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}
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/* writes a data byte to the LCD */
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static void lcd_write_dat(uint8_t data)
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{
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/* wait while transmit FIFO */
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while (!(SSP_SR & (1<<1)));
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/* write data */
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SSP_DATA = data;
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}
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/* writes 2 data bytes to the LCD */
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static void lcd_write_dat_word(uint8_t data1, uint8_t data2)
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{
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lcd_write_dat(data1);
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lcd_write_dat(data2);
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}
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/* writes both a command and data value to the lcd */
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static void lcd_write(uint8_t cmd, uint8_t data)
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{
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lcd_write_cmd(cmd);
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lcd_write_dat(data);
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}
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/* Initialises lcd type 0
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* This appears to be a WiseChip OLED display controlled by a SEPS114A.
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*/
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static void lcd_init_type0(void)
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{
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lcd_write(0x01, 0x00); /* SOFT_RESET */
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lcd_write(0x14, 0x01); /* STANDBY_ON_OFF */
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sleep(1); /* actually only 5 ms needed */
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lcd_write(0x14, 0x00); /* STANDBY_ON_OFF */
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sleep(1); /* actually only 5 ms needed */
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lcd_write(0x0F, 0x41); /* ANALOG_CONTROL */
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lcd_write(0xEA, 0x0A); /* ? */
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lcd_write(0xEB, 0x42); /* ? */
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lcd_write(0x18, 0x08); /* DISCHARGE_TIME */
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lcd_write(0x1A, 0x0B); /* OSC_ADJUST */
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lcd_write(0x48, 0x03); /* ROW_OVERLAP */
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lcd_write(0x30, 0x00); /* DISPLAY_X1 */
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lcd_write(0x31, 0x5F); /* DISPLAY_X2 */
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lcd_write(0x32, 0x00); /* DISPLAY_Y1 */
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lcd_write(0x33, 0x5F); /* DISPLAY_Y2 */
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lcd_write(0xE0, 0x10); /* RGB_IF */
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lcd_write(0xE1, 0x00); /* RGB_POL */
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lcd_write(0xE5, 0x80); /* DISPLAY_MODE_CONTROL */
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lcd_write(0x0D, 0x00); /* CPU_IF */
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lcd_write(0x1D, 0x01); /* MEMORY_WRITE_READ */
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lcd_write(0x09, 0x00); /* ROW_SCAN_DIRECTION */
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lcd_write(0x13, 0x00); /* ROW_SCAN_MODE */
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lcd_write(0x16, 0x05); /* PEAK_PULSE_DELAY */
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lcd_write(0x3A, 0x03); /* PEAK_PULSE_WIDTH_R */
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lcd_write(0x3B, 0x03); /* PEAK_PULSE_WIDTH_G */
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lcd_write(0x3C, 0x03); /* PEAK_PULSE_WIDTH_B */
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lcd_write(0x3D, 0x45); /* PRECHARGE_CURRENT_R */
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lcd_write(0x3E, 0x45); /* PRECHARGE_CURRENT_G */
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lcd_write(0x3F, 0x45); /* PRECHARGE_CURRENT_B */
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lcd_write(0x40, 0x62); /* COLUMN_CURRENT_R */
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lcd_write(0x41, 0x3D); /* COLUMN_CURRENT_G */
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lcd_write(0x42, 0x46); /* COLUMN_CURRENT_B */
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}
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/* writes a table entry (for type 1 LCDs) */
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static void lcd_write_nibbles(uint8_t val)
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{
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lcd_write_dat_word((val >> 4) & 0x0F, (val >> 0) & 0x0F);
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}
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/* Initialises lcd type 1
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* This appears to be a Visionox OLED display, with a LDT LD7134 controller
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*/
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static void lcd_init_type1(void)
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{
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static const uint8_t curve[128] = {
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/* 5-bit curve */
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0, 5, 10, 15, 20, 25, 30, 35, 39, 43, 47, 51, 55, 59, 63, 67,
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71, 75, 79, 83, 87, 91, 95, 99, 103, 105, 109, 113, 117, 121, 123, 127,
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/* 6-bit curve */
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0, 2, 4, 6, 8, 10, 12, 16, 18, 24, 26, 28, 30, 32, 34, 36,
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38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68,
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70, 72, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102,
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104, 106, 108, 110, 112, 114, 116, 118, 120, 121, 122, 123, 124, 125, 126, 127,
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/* 5-bit curve */
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0, 5, 10, 15, 20, 25, 30, 35, 39, 43, 47, 51, 55, 59, 63, 67,
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71, 75, 79, 83, 87, 91, 93, 97, 101, 105, 109, 113, 117, 121, 124, 127
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};
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int i;
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lcd_write(0x02, 0x00); /* DDISP OFF */
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lcd_write_cmd(0x01); /* SOFTRESET */
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lcd_write(0x03, 0x00); /* DSTBY ON */
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lcd_write(0x04, 0x02); /* Set OSC Control 2 = 90Hz*/
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lcd_write(0x05, 0x00); /* Write Direction 0x08 results in BGR colour */
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lcd_write(0x06, 0x00); /* Set Row Scan Direction */
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lcd_write(0x07, 0x00); /* Set Display Size */
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lcd_write_dat_word(0x00, 0x04);
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lcd_write_dat_word(0x1F, 0x00);
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lcd_write_dat_word(0x00, 0x05);
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lcd_write_dat(0x0F);
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lcd_write(0x08, 0x01); /* Set Interface Bus Type 1 = 8-bit*/
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lcd_write(0x09, 0x07); /* Set Masking Data */
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lcd_write_cmd(0x0A); /* Set Read/Write Box Data */
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lcd_write_nibbles(0);
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lcd_write_nibbles(LCD_WIDTH - 1);
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lcd_write_nibbles(0);
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lcd_write_nibbles(LCD_HEIGHT - 1);
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lcd_write(0x0B, 0x00); /* Set Display Start Address */
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lcd_write_dat_word(0x00, 0x00);
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lcd_write_dat(0x00);
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lcd_write_cmd(0x0E); /* Set Dot Matrix Current Level */
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lcd_write_nibbles(0x42);
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lcd_write_nibbles(0x25);
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lcd_write_nibbles(0x3F);
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lcd_write(0x0F, 0x0A); /* Set Dot Matrix Peak Current Level */
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lcd_write_dat_word(0x0A, 0x0A);
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lcd_write(0x1C, 0x08); /* Set Pre-Charge Width */
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lcd_write(0x1D, 0x00); /* Set Peak Pulse Width */
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lcd_write_dat_word(0x00, 0x00);
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lcd_write(0x1E, 0x05); /* Set Peak Pulse Delay */
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lcd_write(0x1F, 0x00); /* Set Row Scan Operation 0=Mode 1 : Default scan mode */
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lcd_write(0x30, 0x10); /* Set Internal Regulator for Row Scan*/
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lcd_write_cmd(0x3A); /* Set Gamma Correction Table */
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for (i = 0; i < 128; i++) {
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lcd_write_nibbles(curve[i]);
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}
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lcd_write_cmd(0x3B); /* Set Gamma Correction Table Initialize */
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lcd_write(0x3C, 0x00); /* Set VDD Selection */
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lcd_write(0x3D, 0x00); /* DMODE 0= 65K Color */
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}
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#ifdef HAVE_LCD_ENABLE
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/* enables/disables the lcd */
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void lcd_enable(bool on)
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{
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if (on == lcd_enabled) {
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return;
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}
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if (lcd_type == 0) {
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if (on) {
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lcd_write(0x14, 0x00); /* STANDBY_ON_OFF */
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lcd_write(0x02, 0x01); /* DISP_ON_OFF */
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lcd_write(0xD2, 0x04); /* SCREEN_SAVER_MODE */
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lcd_write(0xD0, 0x80); /* SCREEN_SAVER_CONTROL */
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sleep(HZ * 100/1000);
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lcd_write(0xD0, 0x00); /* SCREEN_SAVER_CONTROL */
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/* apply 180 degree flip via memory write direction (1Dh):
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MDIR1|MDIR0 = decrement both; normal is horizontal-decrement */
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lcd_write(0x1D, lcd_flipped ? 0x02 : 0x01);
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}
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else {
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lcd_write(0xD2, 0x05);
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lcd_write(0xD0, 0x80);
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sleep(HZ * 100/1000);
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lcd_write(0x02, 0x00);
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lcd_write(0xD0, 0x00);
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lcd_write(0x14, 0x01);
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}
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}
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else {
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if (on) {
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lcd_write(0x03, 0x00);
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lcd_write(0x02, 0x01);
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/* apply 180 degree flip via graphic RAM writing direction (05h):
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D[2:0] = 011 starts from XE,YE (both axes reversed) */
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lcd_write(0x05, lcd_flipped ? 0x03 : 0x00);
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}
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else {
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lcd_write(0x02, 0x00);
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lcd_write(0x03, 0x01);
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lcd_write(0x14, 0x01); /* DSTBY ON */
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}
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}
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lcd_enabled = on;
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}
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/* returns true if the lcd is enabled */
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bool lcd_active(void)
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{
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return lcd_enabled;
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}
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#endif /* HAVE_LCD_ENABLE */
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/* initialises the lcd */
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void lcd_init_device(void)
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{
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lcd_type = lcd_hw_init();
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if (lcd_type == 0) {
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lcd_init_type0();
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}
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else {
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lcd_init_type1();
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}
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lcd_enable(true);
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}
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/* sets up the lcd to receive frame buffer data */
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static void lcd_setup_rect(int x, int x_end, int y, int y_end)
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{
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if (lcd_flipped) {
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/* Mirror the window to the opposite corner; the reversed write
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direction set in lcd_enable() fills it back-to-front, drawing the
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framebuffer rotated 180 degrees with no per-pixel work. */
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int fx = LCD_WIDTH - 1 - x_end;
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int fy = LCD_HEIGHT - 1 - y_end;
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x_end = LCD_WIDTH - 1 - x;
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y_end = LCD_HEIGHT - 1 - y;
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x = fx;
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y = fy;
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}
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if (lcd_type == 0) {
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lcd_write(0x34, x); /* MEM_X1 */
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lcd_write(0x35, x_end); /* MEM_X2 */
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lcd_write(0x36, y); /* MEM_Y1 */
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lcd_write(0x37, y_end); /* MEM_Y2 */
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lcd_write_cmd(0x08); /* DDRAM_DATA_ACCESS_PORT */
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}
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else {
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lcd_write_cmd(0x0A); /* Set Read/Write Box Data */
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lcd_write_nibbles(x);
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lcd_write_nibbles(x_end);
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lcd_write_nibbles(y);
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lcd_write_nibbles(y_end);
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lcd_write_cmd(0x0C); /* Read/Write Display Data */
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}
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}
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/* sets the brightness of the OLED */
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void oled_brightness(int brightness)
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{
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int r, g, b;
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if (lcd_type == 0) {
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r = 2 + 16*brightness;
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g = 1 + 10*brightness;
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b = 1 + (23*brightness)/2;
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lcd_write(0x40, r); /* COLUMN_CURRENT_R */
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lcd_write(0x41, g); /* COLUMN_CURRENT_G */
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lcd_write(0x42, b); /* COLUMN_CURRENT_B */
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}
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else {
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r = 6 + 10*brightness;
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g = 1 + 6*brightness;
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b = 3 + 10*brightness;
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lcd_write_cmd(0x0E); /* Set Dot Matrix Current Level */
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lcd_write_nibbles(r);
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lcd_write_nibbles(g);
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lcd_write_nibbles(b);
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}
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}
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/* Writes framebuffer data */
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void lcd_write_data(const fb_data *data, int count)
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{
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fb_data pixel;
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while (count--) {
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pixel = *data++;
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lcd_write_dat_word((pixel >> 8) & 0xFF, (pixel >> 0) & 0xFF);
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}
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}
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/* Rotate the display 180 degrees (the flip_display setting). Both panel
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controllers do this in hardware by reversing the GRAM write direction (set in
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lcd_enable) so the address counter walks the framebuffer backwards;
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lcd_setup_rect mirrors the write window to match. Cycle the panel off/on here
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so a change (e.g. toggled from the menu) takes effect immediately. */
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void lcd_set_flip(bool yesno)
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{
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if (yesno == lcd_flipped)
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return;
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lcd_flipped = yesno;
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if (lcd_enabled) {
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lcd_enable(false);
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lcd_enable(true);
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}
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}
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/* Updates a fraction of the display. */
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void lcd_update_rect(int x, int y, int width, int height)
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{
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int row;
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int x_end = x + width;
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int y_end = y + height;
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/* check rectangle */
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if ((x >= LCD_WIDTH) || (x_end <= 0) || (y >= LCD_HEIGHT) || (y_end <= 0)) {
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/* rectangle is outside visible display, do nothing */
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return;
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}
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/* update entire horizontal strip for display type 0 (wisechip) */
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if (lcd_type == 0) {
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x = 0;
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x_end = 96;
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}
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/* correct rectangle (if necessary) */
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if (x < 0) {
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x = 0;
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}
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if (x_end > LCD_WIDTH) {
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x_end = LCD_WIDTH;
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}
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if (y < 0) {
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y = 0;
|
|
}
|
|
if (y_end > LCD_HEIGHT) {
|
|
y_end = LCD_HEIGHT;
|
|
}
|
|
width = x_end - x;
|
|
|
|
/* setup GRAM write window */
|
|
lcd_setup_rect(x, x_end - 1, y, y_end - 1);
|
|
|
|
void* (*fbaddr)(int x, int y) = FB_CURRENTVP_BUFFER->get_address_fn;
|
|
/* write to GRAM */
|
|
for (row = y; row < y_end; row++) {
|
|
lcd_write_data(fbaddr(x,row), width);
|
|
}
|
|
}
|
|
|
|
/* updates the entire lcd */
|
|
void lcd_update(void)
|
|
{
|
|
lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
|
|
}
|
|
|