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/*
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 the hardware interface details */
#if defined(BOARD_OLIMEX_STM32_E407)
#include "tdisp_lld_board_olimex_e407.h"
#elif defined(BOARD_ST_STM32F4_DISCOVERY)
#include "tdisp_lld_board_st_stm32f4_discovery.h"
#else
#include "tdisp_lld_board_example.h"
#endif
/* The user may override the default display size */
#ifndef TDISP_COLUMNS
#define TDISP_COLUMNS 16
#endif
#ifndef TDISP_ROWS
#define TDISP_ROWS 2
#endif
/* Controller Specific Properties */
#define CUSTOM_CHAR_COUNT 8
#define CUSTOM_CHAR_XBITS 5
#define CUSTOM_CHAR_YBITS 8
/* Define the properties of our controller */
tdispStruct TDISP = {
TDISP_COLUMNS, TDISP_ROWS, /* cols, rows */
CUSTOM_CHAR_XBITS, CUSTOM_CHAR_YBITS, /* charBitsX, charBitsY */
CUSTOM_CHAR_COUNT /* maxCustomChars */
};
/* Our display control */
#define DISPLAY_ON 0x04
#define CURSOR_ON 0x02
#define CURSOR_BLINK 0x01
static uint8_t displaycontrol;
bool_t tdisp_lld_init(void) {
/* initialise hardware */
init_board();
/* wait some time */
chThdSleepMilliseconds(50);
write_cmd(0x38);
chThdSleepMilliseconds(64);
displaycontrol = DISPLAY_ON | CURSOR_ON | CURSOR_BLINK; // The default displaycontrol
write_cmd(0x08 | displaycontrol);
chThdSleepMicroseconds(50);
write_cmd(0x01); // Clear the screen
chThdSleepMilliseconds(5);
write_cmd(0x06);
chThdSleepMicroseconds(50);
return TRUE;
}
void tdisp_lld_clear(void) {
write_cmd(0x01);
}
void tdisp_lld_draw_char(char c) {
write_data(c);
}
void tdisp_lld_set_cursor(coord_t col, coord_t row) {
static const uint8_t row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
/*
* Short-cut:
*
* If x and y = 0 then use the home command.
*
* Note: There is probably no advantage as both commands are a single byte
*/
// if (col == 0 && row == 0) {
// write_cmd(0x02);
// return;
// }
write_cmd(0x80 | (col + row_offsets[row]));
}
void tdisp_lld_create_char(uint8_t address, uint8_t *charmap) {
int i;
write_cmd(0x40 | (address << 3));
for(i = 0; i < CUSTOM_CHAR_YBITS; i++)
write_data(charmap[i]);
}
void tdisp_lld_control(uint16_t what, void *value) {
switch(what) {
case TDISP_CTRL_BACKLIGHT:
if ((uint8_t)value)
displaycontrol |= DISPLAY_ON;
else
displaycontrol &= ~DISPLAY_ON;
write_cmd(0x08 | displaycontrol);
break;
case TDISP_CTRL_CURSOR:
switch((cursorshape)value) {
case cursorOff:
displaycontrol &= ~CURSOR_ON;
break;
case cursorBlock:
case cursorUnderline:
case cursorBar:
displaycontrol = (displaycontrol | CURSOR_ON) & ~CURSOR_BLINK;
break;
case cursorBlinkingBlock:
case cursorBlinkingUnderline:
case cursorBlinkingBar:
default:
displaycontrol |= (CURSOR_ON | CURSOR_BLINK);
break;
}
write_cmd(0x08 | displaycontrol);
break;
}
}
#endif /* GFX_USE_TDISP */
/** @} */
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