mirror of
https://libwebsockets.org/repo/libwebsockets
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15ce46d971
Make a start on generic peripheral and bus drivers to provide
meta-functionality regardless of platform.
On the one hand this simply provides...
- bitbang i2c on top of esp-idf gpio apis
- ssd1306 oled chip driver as found on Heltec WB32
- modifications to the minimal example test for esp32 to use that
... on the other hand, those capabilities are provided by creating:
- an abstract i2c class object
- an abstract gpio class object
- i2c class implementation using the abstract gpio for bitbang
- an abstract display class object
- an abstract display state (brightness, animated change,
on/off/init tracking, autodim after inactive, auto-off /
blanking after inactive)
... with the intention, eg, you only have to add a platform
implementation for the gpio to be able to use the i2c-based
display drivers and state handling, and i2c bitbang, without
any other modifications.
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*
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* esp32 / esp-idf gpio
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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 <libwebsockets.h>
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static void
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lws_gpio_esp32_mode(_lws_plat_gpio_t gpio, int flags)
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{
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int mode, pup = GPIO_FLOATING;
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switch (flags & (LWSGGPIO_FL_READ | LWSGGPIO_FL_WRITE)) {
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default:
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lwsl_err("%s: neither read nor write\n", __func__);
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return;
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case LWSGGPIO_FL_READ:
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mode = GPIO_MODE_INPUT;
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break;
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case LWSGGPIO_FL_WRITE:
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mode = GPIO_MODE_OUTPUT;
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break;
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case LWSGGPIO_FL_READ | LWSGGPIO_FL_WRITE:
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mode = GPIO_MODE_INPUT_OUTPUT;
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break;
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}
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switch (flags & (LWSGGPIO_FL_PULLUP | LWSGGPIO_FL_PULLDOWN)) {
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default:
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break;
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case LWSGGPIO_FL_PULLUP:
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pup = GPIO_PULLUP_ONLY;
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break;
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case LWSGGPIO_FL_PULLDOWN:
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pup = GPIO_PULLDOWN_ONLY;
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break;
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case LWSGGPIO_FL_PULLUP | LWSGGPIO_FL_PULLDOWN:
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pup = GPIO_PULLUP_PULLDOWN;
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break;
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}
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gpio_reset_pin(gpio);
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gpio_set_direction(gpio, mode);
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gpio_set_pull_mode(gpio, pup);
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gpio_set_level(gpio, flags & LWSGGPIO_FL_START_LOW ? 0 : 1);
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}
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static int
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lws_gpio_esp32_read(_lws_plat_gpio_t gpio)
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{
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return gpio_get_level(gpio);
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}
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static void
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lws_gpio_esp32_set(_lws_plat_gpio_t gpio, int val)
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{
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gpio_set_level(gpio, val);
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}
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static int
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lws_gpio_esp32_irq_mode(_lws_plat_gpio_t gpio, lws_gpio_irq_t irq_type,
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lws_gpio_irq_cb_t cb, void *arg)
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{
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if (gpio_set_intr_type(gpio, irq_type))
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return 1;
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if (cb)
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return gpio_isr_handler_add(gpio, cb, arg);
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return gpio_isr_handler_remove(gpio);
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}
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const lws_gpio_ops_t lws_gpio_plat = {
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.mode = lws_gpio_esp32_mode,
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.read = lws_gpio_esp32_read,
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.set = lws_gpio_esp32_set,
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.irq_mode = lws_gpio_esp32_irq_mode,
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};
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