diff options
Diffstat (limited to 'Projects/SerialToLCD/Lib/HD44780.c')
| -rw-r--r-- | Projects/SerialToLCD/Lib/HD44780.c | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/Projects/SerialToLCD/Lib/HD44780.c b/Projects/SerialToLCD/Lib/HD44780.c deleted file mode 100644 index 61a9b7ec6d..0000000000 --- a/Projects/SerialToLCD/Lib/HD44780.c +++ /dev/null @@ -1,127 +0,0 @@ -/* - LUFA Library - Copyright (C) Dean Camera, 2017. - - dean [at] fourwalledcubicle [dot] com - www.lufa-lib.org -*/ - -/* - Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com) - Copyright 2012 Simon Foster (simon.foster [at] inbox [dot] com) - - Permission to use, copy, modify, distribute, and sell this - software and its documentation for any purpose is hereby granted - without fee, provided that the above copyright notice appear in - all copies and that both that the copyright notice and this - permission notice and warranty disclaimer appear in supporting - documentation, and that the name of the author not be used in - advertising or publicity pertaining to distribution of the - software without specific, written prior permission. - - The author disclaims all warranties with regard to this - software, including all implied warranties of merchantability - and fitness. In no event shall the author be liable for any - special, indirect or consequential damages or any damages - whatsoever resulting from loss of use, data or profits, whether - in an action of contract, negligence or other tortious action, - arising out of or in connection with the use or performance of - this software. -*/ - -#include "HD44780.h" - -static void HD44780_WriteNibble(const uint8_t nib) -{ - /* Read PORTD and clear the ENABLE and PD0..3 bits - then OR in the data */ - - PORTD = (PORTD & ~(ENABLE | LO4_MASK)) | (nib & LO4_MASK); - - /* Enforce address setup time (tAS) 60ns - 60 @ 16MHz = <1 - Let's us a few NOPs for good measure */ - asm volatile("nop\n\t" - "nop\n\t" - :: ); - - /* Take enable high and enforce Enable High time (tEH=450ns) - 450ns @ 16MHz = 7.2 => 7 NOPs */ - - PORTD |= ENABLE; - - asm volatile("nop\n\t" - "nop\n\t" - "nop\n\t" - "nop\n\t" - "nop\n\t" - "nop\n\t" - "nop\n\t" - "nop\n\t" - :: ); - - /* Take enable low and enforce Enable Low time (tEL=500ns) - 500ns @ 16MHz = 8.0 => 7 NOPs */ - PORTD &= ~ENABLE; - - asm volatile("nop\n\t" - "nop\n\t" - "nop\n\t" - "nop\n\t" - "nop\n\t" - "nop\n\t" - "nop\n\t" - "nop\n\t" - :: ); -} - -static void HD44780_WriteByte(const uint8_t c) -{ - HD44780_WriteNibble(HI4(c)); - HD44780_WriteNibble(LO4(c)); -} - -static void HD44780_PowerUp4Bit(void) -{ - /* Wait for more than 40 ms after VCC rises to 2.7 V */ - _delay_ms(40); - HD44780_WriteNibble(0x03); // FN_SET 8-bit - - /* Wait for more than 4.1 ms */ - _delay_ms(5); - HD44780_WriteNibble(0x03); // FN_SET 8-bit - - /* Wait for more than 100 µs */ - _delay_us(100); - HD44780_WriteNibble(0x03); // FN_SET 8-bit - - /* From now on we must allow 40us for each command */ - _delay_us(50); - HD44780_WriteNibble(0x02); // FN_SET 4-bit - - /* The LCD is now in 4-bit mode so we can continue - using the 4-bit API */ - _delay_us(50); -} - -void HD44780_Initialize(void) -{ - PORTD &= ~ALL_BITS; - DDRD |= ALL_BITS; - HD44780_PowerUp4Bit(); -} - -void HD44780_WriteCommand(const uint8_t c) -{ - PORTD &= ~RS; - HD44780_WriteByte(c); - _delay_us(50); -} - -void HD44780_WriteData(const uint8_t c) -{ - PORTD |= RS; - HD44780_WriteByte(c); - PORTD &= ~RS; - _delay_us(50); -} |