72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/*
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Copyright 2022, Savanni D'Gerinel <savanni@luminescent-dreams.com>
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This file is part of Savanni's AVR library.
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This AVR library is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option) any
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later version.
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Lumeto is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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Lumeto. If not, see <https://www.gnu.org/licenses/>.
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*/
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/* This library covers a three-wire diagnostic display board.
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*
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* Hardware:
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* 74HC595 shift register
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* Adafruit HD44780 LCD
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*
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* Input pins:
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* SDI -- Serial data in. This leads to the 74HC595, pin 14 (A).
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* CLK -- Clock pulse. One bit will be shifted into the device on each rising
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* edge. This leads to the 74HC595, pin 11 (Shift Clock).
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* LS -- Latch pulse. All data in the shift register will be sent to the
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* output on a rising edge. This leads to the 74HC595, pin 12 (Latch Clock);
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*
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* 74HC595 -> HD44780
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* Qc -> D4
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* Qd -> D5
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* Qe -> D6
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* Qf -> D7
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* Qg -> RS
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* Qh -> E
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*
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* I use the 4-wire protocol of the HD44780. This means that two of the shift
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* register pins are used for the RS and E control pins of the LCD.
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*/
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#ifndef __DISPLAY_H__
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#define __DISPLAY_H__
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#include <shift_register.h>
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#include <stddef.h>
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typedef struct DISPLAY {
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shift_register_t reg;
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/*
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gpio_t register_select;
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gpio_t enable;
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*/
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} display_t;
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void display_init(display_t *);
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void display_clear(display_t *);
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void display_enable(display_t *);
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void display_set_location(display_t *, size_t, size_t);
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void display_write_message(display_t *, const char *);
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void display_write_bit_pattern(display_t *, const uint8_t);
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#endif
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