avr/display/display.h

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/*
Copyright 2022, Savanni D'Gerinel <savanni@luminescent-dreams.com>
This file is part of Savanni's AVR library.
Lumeto 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 3 of the License, or (at your option) any later version.
Lumeto is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
*/
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/* This library covers a five-wire diagnostic display board.
*
* Hardware:
* 74HC595 shift register
* Adafruit HD44780 LCD
*
* Input pins:
* SDI -- Serial data in. This leads to the 74HC595, pin 14 (A).
* CLK -- Clock pulse. One bit will be shifted into the device on each rising
* edge. This leads to the 74HC595, pin 11 (Shift Clock).
* LS -- Latch pulse. All data in the shift register will be sent to the
* output on a rising edge. This leads to the 74HC595, pin 12 (Latch Clock);
* RS -- Register select. 0 to write an instruction to the display, 1 to write
* data to the display.
* E -- Enable. This tells the display to read the data. The display will get
* the data on the shift register outputs, so be sure to send LS before
* sending E.
*
* 74HC595 -> HD44780
* Qa -> D0
* Qb -> D1
* Qc -> D2
* Qd -> D3
* Qe -> D4
* Qf -> D5
* Qg -> D6
* Qh -> D7
*/
#ifndef __DISPLAY_H__
#define __DISPLAY_H__
#include <shift_register.h>
typedef struct DISPLAY {
shift_register_t reg;
gpio_t register_select;
gpio_t enable;
} display_t;
void display_init(display_t *);
void display_clear(display_t *);
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 *);
#endif