1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*
ChibiOS/GFX - Copyright (C) 2012, 2013
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 */
/** @} */
|
