aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/gdisp/PCD8544/gdisp_lld_PCD8544.c
blob: 531a5a425e57f4bf567a9206d030f5ef4acfa4c8 (plain)
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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
/*
 * This file is subject to the terms of the GFX License. If a copy of
 * the license was not distributed with this file, you can obtain one at:
 *
 *              http://ugfx.org/license.html
 */

#include "gfx.h"

#if GFX_USE_GDISP

#define GDISP_DRIVER_VMT		GDISPVMT_PCD8544
#include "drivers/gdisp/PCD8544/gdisp_lld_config.h"
#include "src/gdisp/gdisp_driver.h"
#include "board_PCD8544.h"

/*===========================================================================*/
/* Driver local definitions.                                                 */
/*===========================================================================*/

#define GDISP_SCREEN_HEIGHT		48
#define GDISP_SCREEN_WIDTH		84

#define GDISP_INITIAL_CONTRAST		51
#define GDISP_INITIAL_BACKLIGHT		100

#define GDISP_FLG_NEEDFLUSH		(GDISP_FLG_DRIVER << 0)

#include "drivers/gdisp/PCD8544/PCD8544.h"

/*===========================================================================*/
/* Driver local routines.                                                    */
/*===========================================================================*/

// Some common routines and macros
#define RAM(g)			((uint8_t *)g->priv)

#define xyaddr(x, y)		((x) + ((y) >> 3) * GDISP_SCREEN_WIDTH)
#define xybit(y)		(1 << ((y) & 7))

/*===========================================================================*/
/* Driver exported functions.                                                */
/*===========================================================================*/

/*
 * As this controller can't update on a pixel boundary we need to maintain the
 * the entire display surface in memory so that we can do the necessary bit
 * operations. Fortunately it is a small display in monochrome.
 * Display 48 * 84 / 8 = 504
 */

#define GDISP_SCREEN_BYTES ((GDISP_SCREEN_WIDTH * GDISP_SCREEN_HEIGHT) / 8)

LLDSPEC bool_t gdisp_lld_init(GDisplay *g) {
	// The private area is the display surface.
	if (!(g->priv = gfxAlloc(GDISP_SCREEN_BYTES)))
		gfxHalt("GDISP PCD8544: Failed to allocate private memory");

	// Initialise the board interface
	init_board(g);

	// Hardware reset
	setpin_reset(g, TRUE);
	gfxSleepMilliseconds(100);
	setpin_reset(g, FALSE);
	gfxSleepMilliseconds(100);

	acquire_bus(g);

	write_cmd(g, PCD8544_SET_FUNC  		| PCD8544_H);
	write_cmd(g, PCD8544_SET_TEMP  		| PCD8544_TEMP_MODE_2);
	write_cmd(g, PCD8544_SET_BIAS  		| PCD8544_BIAS_MODE_4);
	write_cmd(g, PCD8544_SET_VOP		| (0x40));
	write_cmd(g, PCD8544_SET_FUNC);
	write_cmd(g, PCD8544_SET_DISPLAY	| PCD8544_DISPLAY_MODE_NORMAL);
	write_cmd(g, PCD8544_SET_X);		// X = 0
	write_cmd(g, PCD8544_SET_Y);		// Y = 0

	write_data(g, 0x00, GDISP_SCREEN_BYTES);

	// Finish Init
	post_init_board(g);

 	// Release the bus
	release_bus(g);

	/* Turn on the back-light */
	set_backlight(g, GDISP_INITIAL_BACKLIGHT);

	/* Initialise the GDISP structure */
	g->g.Width = GDISP_SCREEN_WIDTH;
	g->g.Height = GDISP_SCREEN_HEIGHT;
	g->g.Orientation = GDISP_ROTATE_0;
	g->g.Powermode = powerOn;
	g->g.Backlight = GDISP_INITIAL_BACKLIGHT;
	g->g.Contrast = GDISP_INITIAL_CONTRAST;

	return TRUE;
}

#if GDISP_HARDWARE_FLUSH
	LLDSPEC void gdisp_lld_flush(GDisplay *g) {

		// Don't flush if we don't need it.
		if (!(g->flags & GDISP_FLG_NEEDFLUSH)) {
			return;
		}

		acquire_bus(g);

		write_cmd(g, PCD8544_SET_X | 0);  // X = 0
		write_cmd(g, PCD8544_SET_Y | 0);  // Y = 0

		write_data(g, RAM(g), GDISP_SCREEN_BYTES);

		release_bus(g);
	}
#endif

#if GDISP_HARDWARE_DRAWPIXEL
	LLDSPEC void gdisp_lld_draw_pixel(GDisplay *g) {
		coord_t x, y;

		#if GDISP_NEED_CONTROL
			switch(g->g.Orientation) {
			default:
			case GDISP_ROTATE_0:
				x = g->p.x;
				y = g->p.y;
				break;
			case GDISP_ROTATE_90:
				x = g->p.y;
				y = g->g.Width - g->p.x - 1;
				break;
			case GDISP_ROTATE_180:
				x = g->g.Width  - g->p.x - 1;
				y = g->g.Height - g->p.y - 1;
				break;
			case GDISP_ROTATE_270:
				x = g->g.Height - g->p.y - 1;
				y = g->p.x;
				break;
			}
		#else
			x = g->p.x;
			y = g->p.y;
		#endif

		if (gdispColor2Native(g->p.color) != Black) {
			RAM(g)[xyaddr(x, y)] |= xybit(y);
		} else {
			RAM(g)[xyaddr(x, y)] &= ~xybit(y);
		}

		g->flags |= GDISP_FLG_NEEDFLUSH;
	}
#endif

#if GDISP_NEED_CONTROL
	LLDSPEC void gdisp_lld_control(GDisplay *g) {
		switch(g->p.x) {
		case GDISP_CONTROL_POWER:
			if (g->g.Powermode == (powermode_t)g->p.ptr)
				return;
			switch((powermode_t)g->p.ptr) {
			case powerOff:
			case powerSleep:
			case powerDeepSleep:
				write_cmd(g, PCD8544_SET_FUNC | PCD8544_PD);
				break;
			case powerOn:
				write_cmd(g, PCD8544_SET_FUNC);
				break;
			default:
				return;
			}
			g->g.Powermode = (powermode_t)g->p.ptr;
			return;

		case GDISP_CONTROL_ORIENTATION:
			if (g->g.Orientation == (orientation_t)g->p.ptr)
				return;
			switch((orientation_t)g->p.ptr) {
				case GDISP_ROTATE_0:
				case GDISP_ROTATE_180:
					if (g->g.Orientation == GDISP_ROTATE_90 || g->g.Orientation == GDISP_ROTATE_270) {
						coord_t		tmp;

						tmp = g->g.Width;
						g->g.Width = g->g.Height;
						g->g.Height = tmp;
					}
					break;
				case GDISP_ROTATE_90:
				case GDISP_ROTATE_270:
					if (g->g.Orientation == GDISP_ROTATE_0 || g->g.Orientation == GDISP_ROTATE_180) {
						coord_t		tmp;

						tmp = g->g.Width;
						g->g.Width = g->g.Height;
						g->g.Height = tmp;
					}
					break;
				default:
					return;
			}
			g->g.Orientation = (orientation_t)g->p.ptr;
			return;

		case GDISP_CONTROL_BACKLIGHT:
			if ((unsigned)g->p.ptr > 100) g->p.ptr = (void *)100;
			set_backlight(g, (unsigned)g->p.ptr);
			g->g.Backlight = (unsigned)g->p.ptr;
			return;

		case GDISP_CONTROL_CONTRAST:
			if ((unsigned)g->p.ptr > 100) g->p.ptr = (void *)100;
			write_cmd(g, PCD8544_SET_VOP | (unsigned)g->p.ptr);
			g->g.Contrast = (unsigned)g->p.ptr;
			return;
		}
	}
#endif

#endif // GFX_USE_GDISP