libwebsockets
Lightweight C library for HTML5 websockets
lws-ssd1306-i2c.h
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 #if !defined(__LWS_DISPLAY_SSD1306_I2C_H__)
26 #define __LWS_DISPLAY_SSD1306_I2C_H__
27 
28 /*
29  * D/C# pin on SSD1306 sets the I2C device ads
30  * from these two options (7-bit address)
31  */
32 
33 #define SSD1306_I2C7_ADS1 0x3c
34 #define SSD1306_I2C7_ADS2 0x3d
35 
36 typedef struct lws_display_ssd1306 {
37 
38  lws_display_t disp; /* use lws_display_ssd1306_ops to set ops */
39  const lws_i2c_ops_t *i2c; /* i2c ops */
40 
41  const lws_gpio_ops_t *gpio; /* NULL or gpio ops */
42  _lws_plat_gpio_t reset_gpio; /* if gpio ops, nReset gpio # */
43 
44  uint8_t i2c7_address; /* one of SSD1306_I2C7_ADS... */
45 
47 
48 int
49 lws_display_ssd1306_i2c_init(const struct lws_display *disp);
50 int
51 lws_display_ssd1306_i2c_contrast(const struct lws_display *disp, uint8_t b);
52 int
53 lws_display_ssd1306_i2c_blit(const struct lws_display *disp, const uint8_t *src,
54  lws_display_scalar x, lws_display_scalar y,
55  lws_display_scalar w, lws_display_scalar h);
56 int
57 lws_display_ssd1306_i2c_power(const struct lws_display *disp, int state);
58 
59 #define lws_display_ssd1306_ops \
60  .init = lws_display_ssd1306_i2c_init, \
61  .contrast = lws_display_ssd1306_i2c_contrast, \
62  .blit = lws_display_ssd1306_i2c_blit, \
63  .power = lws_display_ssd1306_i2c_power
64 #endif
Definition: lws-ssd1306-i2c.h:36
Definition: lws-display.h:43
Definition: lws-gpio.h:52
Definition: lws-i2c.h:34