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Diffstat (limited to 'board/fusb307bgevb/lcd.c')
| -rw-r--r-- | board/fusb307bgevb/lcd.c | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/board/fusb307bgevb/lcd.c b/board/fusb307bgevb/lcd.c deleted file mode 100644 index 892888329e..0000000000 --- a/board/fusb307bgevb/lcd.c +++ /dev/null @@ -1,166 +0,0 @@ -/* Copyright 2020 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - * - * LCD driver for I2C LCD 2004. - */ - -#include "i2c.h" -#include "lcd.h" -#include "timer.h" - -struct lcd_state_info { - uint8_t addr; - uint8_t displayfunction; - uint8_t displaycontrol; - uint8_t backlightval; -}; - -static struct lcd_state_info state = { - .addr = LCD_SLAVE_ADDR, - .backlightval = LCD_BACKLIGHT, - .displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5X8DOTS, -}; - -/************ low level data pushing commands **********/ -/* write either command or data */ -static void expander_write(uint8_t data) -{ - i2c_write8(I2C_PORT_TCPC, LCD_SLAVE_ADDR, 0x00, data | - state.backlightval); -} - -static void pulse_enable(uint8_t data) -{ - expander_write(data | LCD_EN);/* En high */ - usleep(1); /* enable pulse must be >450ns */ - - expander_write(data & ~LCD_EN);/* En low */ - usleep(50); /* commands need > 37us to settle */ -} - -static void write_4bits(uint8_t value) -{ - expander_write(value); - pulse_enable(value); -} - -static void send(uint8_t value, uint8_t mode) -{ - uint8_t highnib = value & 0xf0; - uint8_t lownib = (value << 4) & 0xf0; - - write_4bits(highnib | mode); - write_4bits(lownib | mode); -} - -/*********** mid level commands, for sending data/cmds */ -static void command(uint8_t value) -{ - send(value, 0); -} - -/********** high level commands, for the user! */ -void lcd_clear(void) -{ - command(LCD_CLEAR_DISPLAY);/* clear display, set cursor to zero */ - usleep(2000); /* this command takes a long time! */ -} - -void lcd_set_cursor(uint8_t col, uint8_t row) -{ - int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 }; - - command(LCD_SET_DDRAMADDR | (col + row_offsets[row])); -} - -void lcd_print_char(char data) -{ - send(data, LCD_RS); -} - -void lcd_print_string(const char *str) -{ - while (*str) - lcd_print_char(*str++); -} - -/* Turn the display on/off (quickly) */ -void lcd_disable_display(void) -{ - state.displaycontrol &= ~LCD_DISPLAY_ON; - command(LCD_DISPLAY_CONTROL | state.displaycontrol); -} -void lcd_enable_display(void) -{ - state.displaycontrol |= LCD_DISPLAY_ON; - command(LCD_DISPLAY_CONTROL | state.displaycontrol); -} - -/* Turn the (optional) backlight off/on */ -void lcd_disable_backlight(void) -{ - state.backlightval = LCD_NO_BACKLIGHT; - expander_write(0); -} - -void lcd_enable_backlight(void) -{ - state.backlightval = LCD_BACKLIGHT; - expander_write(0); -} - -void lcd_init(uint8_t cols, uint8_t rows, uint8_t dotsize) -{ - if (rows > 1) - state.displayfunction |= LCD_2LINE; - - /* for some 1 line displays you can select a 10 pixel high font */ - if ((dotsize != 0) && (rows == 1)) - state.displayfunction |= LCD_5X10DOTS; - - /* SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION! - * according to datasheet, we need at least 40ms after power rises - * above 2.7V before sending commands. Arduino can turn on way - * before 4.5V so we'll wait 50 - */ - usleep(50); - - /* Now we pull both RS and R/W low to begin commands */ - /* reset expanderand turn backlight off (Bit 8 =1) */ - expander_write(state.backlightval); - usleep(1000); - - /* put the LCD into 4 bit mode - * this is according to the hitachi HD44780 datasheet - * figure 24, pg 46 - * we start in 8bit mode, try to set 4 bit mode - */ - write_4bits(0x03 << 4); - usleep(4500); /* wait min 4.1ms */ - /*second try */ - write_4bits(0x03 << 4); - usleep(4500); /* wait min 4.1ms */ - /* third go! */ - write_4bits(0x03 << 4); - usleep(150); - /* finally, set to 4-bit interface */ - write_4bits(0x02 << 4); - - /* set # lines, font size, etc. */ - command(LCD_FUNCTION_SET | state.displayfunction); - - /* turn the display on with no cursor or blinking default */ - state.displaycontrol = LCD_DISPLAY_ON | LCD_CURSOR_OFF | LCD_BLINK_OFF; - lcd_enable_display(); - - /* clear it off */ - lcd_clear(); - - /* Initialize to default text direction (for roman languages) - * and set the entry mode - */ - command(LCD_ENTRYMODE_SET | LCD_ENTRY_LEFT | LCD_ENTRY_SHIFT_DECREMENT); - - lcd_set_cursor(0, 0); -} |