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/*
* lws abstract display implementation for ssd1306 on i2c
*
* Copyright (C) 2019 - 2020 Andy Green <andy@warmcat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <private-lib-core.h>
#include <drivers/devices/display/ssd1306.h>
static uint8_t ssd1306_128x64_init[] = {
SSD1306_DISPLAYOFF,
SSD1306_SETDISPLAYCLOCKDIV, 0xf0,
SSD1306_SETMULTIPLEX, 64 - 1,
SSD1306_SETDISPLAYOFFSET, 0,
SSD1306_CHARGEPUMP, 0x14,
SSD1306_MEMORYMODE, 0,
SSD1306_SEGREMAP | (0 << 0),
SSD1306_COMSCANDEC,
SSD1306_SETCOMPINS, (1 << 4) | 0x02,
SSD1306_SETCONTRAST, 0, /* start at lowest */
SSD1306_SETPRECHARGE, (0xf << 4) | (1 << 0),
SSD1306_SETVCOMDESELECT, (4 << 4),
SSD1306_DEACTIVATE_SCROLL,
SSD1306_DISPLAYALLON_RESUME,
SSD1306_NORMALDISPLAY,
SSD1306_DISPLAYON
};
int
lws_display_ssd1306_i2c_init(const struct lws_display *disp)
{
const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
si->i2c->init(si->i2c);
if (si->gpio) {
si->gpio->mode(si->reset_gpio, LWSGGPIO_FL_WRITE |
LWSGGPIO_FL_PULLUP);
si->gpio->set(si->reset_gpio, 0);
lws_msleep(1);
si->gpio->set(si->reset_gpio, 1);
lws_msleep(1);
}
if (lws_i2c_command_list(si->i2c, si->i2c7_address,
ssd1306_128x64_init,
LWS_ARRAY_SIZE(ssd1306_128x64_init))) {
lwsl_err("%s: fail\n", __func__);
return 1;
}
return 0;
}
int
lws_display_ssd1306_i2c_contrast(const struct lws_display *disp, uint8_t b)
{
const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
uint8_t ba[2];
ba[0] = SSD1306_SETCONTRAST;
ba[1] = b;
return lws_i2c_command_list(si->i2c, si->i2c7_address,
ba, LWS_ARRAY_SIZE(ba));
}
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)
{
const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
uint8_t ba[6];
int n, m;
/*
* The display is arranged in 128x8 bands, with one byte containing
* the 8 vertical pixels of the band.
*/
if (h < 8)
h = 8;
ba[0] = SSD1306_COLUMNADDR;
ba[1] = x;
ba[2] = x + w - 1;
ba[3] = SSD1306_PAGEADDR;
ba[4] = y / 8;
ba[5] = ba[4] + (h / 8) - 1;
if (lws_i2c_command_list(si->i2c, si->i2c7_address,
ba, LWS_ARRAY_SIZE(ba))) {
lwsl_err("%s: fail\n", __func__);
return 1;
}
for (n = 0; n < (w * h) / 8;) {
lws_bb_i2c_start(si->i2c);
lws_bb_i2c_write(si->i2c, si->i2c7_address << 1);
lws_bb_i2c_write(si->i2c, SSD1306_SETSTARTLINE | y);
for (m = 0; m < w; m++)
lws_bb_i2c_write(si->i2c, src[n++]);
lws_bb_i2c_stop(si->i2c);
y += 8;
}
return 0;
}
int
lws_display_ssd1306_i2c_power(const struct lws_display *disp, int state)
{
const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
if (!state)
return lws_i2c_command(si->i2c, si->i2c7_address,
SSD1306_DISPLAYOFF | !!state);
return lws_display_ssd1306_i2c_init(disp);
}
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