1 /*
2 * lws abstract display implementation for ssd1306 on i2c
3 *
4 * Copyright (C) 2019 - 2020 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25 #include <private-lib-core.h>
26 #include <drivers/devices/display/ssd1306.h>
27
28
29 static uint8_t ssd1306_128x64_init[] = {
30 SSD1306_DISPLAYOFF,
31 SSD1306_SETDISPLAYCLOCKDIV, 0xf0,
32 SSD1306_SETMULTIPLEX, 64 - 1,
33 SSD1306_SETDISPLAYOFFSET, 0,
34 SSD1306_CHARGEPUMP, 0x14,
35 SSD1306_MEMORYMODE, 0,
36 SSD1306_SEGREMAP | (0 << 0),
37 SSD1306_COMSCANDEC,
38 SSD1306_SETCOMPINS, (1 << 4) | 0x02,
39 SSD1306_SETCONTRAST, 0, /* start at lowest */
40 SSD1306_SETPRECHARGE, (0xf << 4) | (1 << 0),
41 SSD1306_SETVCOMDESELECT, (4 << 4),
42 SSD1306_DEACTIVATE_SCROLL,
43 SSD1306_DISPLAYALLON_RESUME,
44 SSD1306_NORMALDISPLAY,
45 SSD1306_DISPLAYON
46 };
47
48 int
lws_display_ssd1306_i2c_init(const struct lws_display * disp)49 lws_display_ssd1306_i2c_init(const struct lws_display *disp)
50 {
51 const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
52
53 si->i2c->init(si->i2c);
54
55 if (si->gpio) {
56 si->gpio->mode(si->reset_gpio, LWSGGPIO_FL_WRITE |
57 LWSGGPIO_FL_PULLUP);
58 si->gpio->set(si->reset_gpio, 0);
59 lws_msleep(1);
60 si->gpio->set(si->reset_gpio, 1);
61 lws_msleep(1);
62 }
63
64 if (lws_i2c_command_list(si->i2c, si->i2c7_address,
65 ssd1306_128x64_init,
66 LWS_ARRAY_SIZE(ssd1306_128x64_init))) {
67 lwsl_err("%s: fail\n", __func__);
68 return 1;
69 }
70
71 return 0;
72 }
73
74 int
lws_display_ssd1306_i2c_contrast(const struct lws_display * disp,uint8_t b)75 lws_display_ssd1306_i2c_contrast(const struct lws_display *disp, uint8_t b)
76 {
77 const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
78 uint8_t ba[2];
79
80 ba[0] = SSD1306_SETCONTRAST;
81 ba[1] = b;
82
83 return lws_i2c_command_list(si->i2c, si->i2c7_address,
84 ba, LWS_ARRAY_SIZE(ba));
85 }
86
87 int
lws_display_ssd1306_i2c_blit(const struct lws_display * disp,const uint8_t * src,lws_display_scalar x,lws_display_scalar y,lws_display_scalar w,lws_display_scalar h)88 lws_display_ssd1306_i2c_blit(const struct lws_display *disp, const uint8_t *src,
89 lws_display_scalar x, lws_display_scalar y,
90 lws_display_scalar w, lws_display_scalar h)
91 {
92 const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
93 uint8_t ba[6];
94 int n, m;
95
96 /*
97 * The display is arranged in 128x8 bands, with one byte containing
98 * the 8 vertical pixels of the band.
99 */
100
101 if (h < 8)
102 h = 8;
103
104 ba[0] = SSD1306_COLUMNADDR;
105 ba[1] = x;
106 ba[2] = x + w - 1;
107 ba[3] = SSD1306_PAGEADDR;
108 ba[4] = y / 8;
109 ba[5] = ba[4] + (h / 8) - 1;
110
111 if (lws_i2c_command_list(si->i2c, si->i2c7_address,
112 ba, LWS_ARRAY_SIZE(ba))) {
113 lwsl_err("%s: fail\n", __func__);
114 return 1;
115 }
116
117 for (n = 0; n < (w * h) / 8;) {
118 lws_bb_i2c_start(si->i2c);
119 lws_bb_i2c_write(si->i2c, si->i2c7_address << 1);
120 lws_bb_i2c_write(si->i2c, SSD1306_SETSTARTLINE | y);
121
122 for (m = 0; m < w; m++)
123 lws_bb_i2c_write(si->i2c, src[n++]);
124
125 lws_bb_i2c_stop(si->i2c);
126 y += 8;
127 }
128
129 return 0;
130 }
131
132 int
lws_display_ssd1306_i2c_power(const struct lws_display * disp,int state)133 lws_display_ssd1306_i2c_power(const struct lws_display *disp, int state)
134 {
135 const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
136
137 if (!state)
138 return lws_i2c_command(si->i2c, si->i2c7_address,
139 SSD1306_DISPLAYOFF | !!state);
140
141 return lws_display_ssd1306_i2c_init(disp);
142 }
143