143 lines
4.0 KiB
C
143 lines
4.0 KiB
C
/*
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* lws abstract display implementation for ssd1306 on i2c
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*
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* Copyright (C) 2019 - 2020 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <private-lib-core.h>
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#include <drivers/devices/display/ssd1306.h>
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static uint8_t ssd1306_128x64_init[] = {
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SSD1306_DISPLAYOFF,
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SSD1306_SETDISPLAYCLOCKDIV, 0xf0,
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SSD1306_SETMULTIPLEX, 64 - 1,
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SSD1306_SETDISPLAYOFFSET, 0,
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SSD1306_CHARGEPUMP, 0x14,
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SSD1306_MEMORYMODE, 0,
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SSD1306_SEGREMAP | (0 << 0),
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SSD1306_COMSCANDEC,
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SSD1306_SETCOMPINS, (1 << 4) | 0x02,
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SSD1306_SETCONTRAST, 0, /* start at lowest */
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SSD1306_SETPRECHARGE, (0xf << 4) | (1 << 0),
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SSD1306_SETVCOMDESELECT, (4 << 4),
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SSD1306_DEACTIVATE_SCROLL,
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SSD1306_DISPLAYALLON_RESUME,
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SSD1306_NORMALDISPLAY,
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SSD1306_DISPLAYON
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};
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int
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lws_display_ssd1306_i2c_init(const struct lws_display *disp)
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{
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const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
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si->i2c->init(si->i2c);
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if (si->gpio) {
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si->gpio->mode(si->reset_gpio, LWSGGPIO_FL_WRITE |
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LWSGGPIO_FL_PULLUP);
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si->gpio->set(si->reset_gpio, 0);
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lws_msleep(1);
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si->gpio->set(si->reset_gpio, 1);
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lws_msleep(1);
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}
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if (lws_i2c_command_list(si->i2c, si->i2c7_address,
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ssd1306_128x64_init,
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LWS_ARRAY_SIZE(ssd1306_128x64_init))) {
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lwsl_err("%s: fail\n", __func__);
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return 1;
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}
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return 0;
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}
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int
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lws_display_ssd1306_i2c_contrast(const struct lws_display *disp, uint8_t b)
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{
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const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
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uint8_t ba[2];
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ba[0] = SSD1306_SETCONTRAST;
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ba[1] = b;
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return lws_i2c_command_list(si->i2c, si->i2c7_address,
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ba, LWS_ARRAY_SIZE(ba));
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}
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int
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lws_display_ssd1306_i2c_blit(const struct lws_display *disp, const uint8_t *src,
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lws_display_scalar x, lws_display_scalar y,
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lws_display_scalar w, lws_display_scalar h)
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{
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const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
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uint8_t ba[6];
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int n, m;
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/*
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* The display is arranged in 128x8 bands, with one byte containing
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* the 8 vertical pixels of the band.
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*/
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if (h < 8)
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h = 8;
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ba[0] = SSD1306_COLUMNADDR;
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ba[1] = x;
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ba[2] = x + w - 1;
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ba[3] = SSD1306_PAGEADDR;
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ba[4] = y / 8;
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ba[5] = ba[4] + (h / 8) - 1;
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if (lws_i2c_command_list(si->i2c, si->i2c7_address,
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ba, LWS_ARRAY_SIZE(ba))) {
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lwsl_err("%s: fail\n", __func__);
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return 1;
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}
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for (n = 0; n < (w * h) / 8;) {
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lws_bb_i2c_start(si->i2c);
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lws_bb_i2c_write(si->i2c, si->i2c7_address << 1);
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lws_bb_i2c_write(si->i2c, SSD1306_SETSTARTLINE | y);
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for (m = 0; m < w; m++)
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lws_bb_i2c_write(si->i2c, src[n++]);
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lws_bb_i2c_stop(si->i2c);
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y += 8;
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}
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return 0;
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}
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int
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lws_display_ssd1306_i2c_power(const struct lws_display *disp, int state)
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{
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const lws_display_ssd1306_t *si = (const lws_display_ssd1306_t *)disp;
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if (!state)
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return lws_i2c_command(si->i2c, si->i2c7_address,
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SSD1306_DISPLAYOFF | !!state);
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return lws_display_ssd1306_i2c_init(disp);
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}
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