ugfx/drivers/tdisp/HD44780/tdisp_lld.c

/*
    ChibiOS/GFX - Copyright (C) 2012
                 Joel Bodenmann aka Tectu <joel@unormal.org>

    This file is part of ChibiOS/GFX.

    ChibiOS/GFX 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.

    ChibiOS/GFX 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
 * @file    drivers/tdisp/HD44780/tdisp_lld.c
 * @brief   TDISP driver subsystem low level driver source for the HD44780 display
 *
 * @addtogroup TDISP
 * @{
 */

#include "ch.h"
#include "hal.h"
#include "gfx.h"

#if GFX_USE_TDISP /*|| defined(__DOXYGEN__)*/

#include "tdisp_lld_board_example.h"

static void _writeData(uint8_t data) {
	write_bus(data);
	
	setpin_e(TRUE);
	chThdSleepMicroseconds(1);
	setpin_e(FALSE);
	chThdSleepMicroseconds(5);
}

void tdisp_lld_write_cmd(uint8_t data) {
	setpin_rs(FALSE);
	setpin_rw(FALSE);

	#if TDISP_NEED_4BIT_MODE
	_writeData(data>>4);
	#endif
	_writeData(data);
}

void tdisp_lld_write_data(uint8_t data) {
	setpin_rs(TRUE);
	setpin_rw(FALSE);

	#if TDISP_NEED_4BIT_MODE
	_writeData(data>>4);
	#endif
	_writeData(data);
}

bool_t tdisp_lld_init(void) { 
	/* initialise MCU hardware */
	init_board();

	/* wait some time */
	chThdSleepMilliseconds(50);

	tdisp_lld_write_cmd(0x38);
	chThdSleepMilliseconds(64);

	tdisp_lld_write_cmd(0x0f);	
	chThdSleepMicroseconds(50);

	tdisp_lld_write_cmd(0x01);
	chThdSleepMilliseconds(5);

	tdisp_lld_write_cmd(0x06);
	chThdSleepMicroseconds(50);

	return TRUE;
}

void tdisp_lld_set_cursor(coord_t col, coord_t row) {
	uint8_t row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };

	if(row >= TDISP_ROWS)
		row = TDISP_ROWS - 1;

	tdisp_lld_write_cmd(0x80 | (col + row_offsets[row]));
}

void tdisp_lld_create_char(uint8_t address, char *charmap) {
	uint8_t i;

	/* make sure we don't write somewhere we're not supposed to */
	address &= TDISP_MAX_CUSTOM_CHARS;

	tdisp_lld_write_cmd(0x40 | (address << 3));

	for(i = 0; i < 8; i++) {
		tdisp_lld_write_data(charmap[i]);
	}
}

void tdisp_lld_clear(void) {
	tdisp_lld_write_cmd(0x01);
}

void tdisp_lld_home(void) {
	tdisp_lld_write_cmd(0x02);
}

void tdisp_lld_control(uint16_t what, void *value) {
	(void)what;
	(void)value;
/*
	switch(attributes) {
		case TDISP_ON:
			_displaycontrol |= 0x04;
			tdisp_lld_write_cmd(0x08 | _displaycontrol);
			break;
		case TDISP_OFF:
			_displaycontrol &=~ 0x04;
			tdisp_lld_write_cmd(0x08 | _displaycontrol);
			break;
		case TDISP_CURSOR_ON:
			_displaycontrol |= 0x02;
			tdisp_lld_write_cmd(0x08 | _displaycontrol);
			break;
		case TDISP_CURSOR_OFF:
			_displaycontrol &=~ 0x02;
			tdisp_lld_write_cmd(0x08 | _displaycontrol);
			break;
		case TDISP_CURSOR_BLINK_ON:
			_displaycontrol |= 0x00;
			tdisp_lld_write_cmd(0x08 | _displaycontrol);
			break;
		case TDISP_CURSOR_BLINK_OFF:
			_displaycontrol &=~ 0x00;
			tdisp_lld_write_cmd(0x08 | _displaycontrol);
			break;
	}
*/
}

#endif /* GFX_USE_TDISP */
/** @} */