/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * * 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); void* (*fbaddr)(int x, int y) = FB_CURRENTVP_BUFFER->get_address_fn; /* 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; void* (*fbaddr)(int x, int y) = FB_CURRENTVP_BUFFER->get_address_fn; /* 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); } }