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324 lines
10 KiB
324 lines
10 KiB
#pragma once
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#include "common.h"
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#include "esphome/components/i2c/i2c.h"
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#include "esphome/core/component.h"
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#include "esphome/core/esphal.h"
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#include <array>
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#include <cmath>
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namespace esphome {
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namespace xiaomi {
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namespace bslamp2 {
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static const uint8_t MSG_LEN = 7;
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using MSG = uint8_t[MSG_LEN];
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using LED = uint16_t;
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using EVENT = uint16_t;
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// clang-format off
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// Bit flags that are used for indicating the LEDs in the front panel.
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// LED_1 is the slider LED closest to the power button.
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// LED_10 is the one closest to the color button.
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enum FrontPanelLEDs {
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LED_ALL = 32768 + 8192 + 1023,
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LED_POWER = 32768,
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LED_COLOR = 8192,
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LED_1 = 512,
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LED_2 = 256,
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LED_3 = 128,
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LED_4 = 64,
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LED_5 = 32,
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LED_6 = 16,
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LED_7 = 8,
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LED_8 = 4,
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LED_9 = 2,
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LED_10 = 1,
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LED_NONE = 0,
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};
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// This I2C command is used during front panel event handling.
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static const MSG READY_FOR_EV = {0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
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// Bit flags that are used for specifying an event.
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// Events are registered using the following bit pattern
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// (bit 1 being the least significant bit):
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//
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// BITS INDICATE PATTERN RESULT
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// 1 status 0 parsing event failed
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// 1 parsing event successful
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// 2-4 part 000 part unknown
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// 001 power button
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// 010 color button
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// 100 slider
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// 5-6 type 00 type unknown
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// 01 touch
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// 10 release
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// 7-11 slider 00000 level known (or part is not "slider")
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// level 00001 level 1
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// ... up to
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// 10101 level 21
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//
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static const EVENT FLAG_INIT = 0b00000000000;
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static const EVENT FLAG_ERR = 0b00000000000;
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static const EVENT FLAG_OK = 0b00000000001;
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static const EVENT FLAG_PART_SHIFT = 1;
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static const EVENT FLAG_PART_MASK = 0b00000001110;
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static const EVENT FLAG_PART_UNKNOWN = 0b00000000000;
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static const EVENT FLAG_PART_POWER = 0b00000000010;
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static const EVENT FLAG_PART_COLOR = 0b00000000100;
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static const EVENT FLAG_PART_SLIDER = 0b00000001000;
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static const EVENT FLAG_TYPE_SHIFT = 4;
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static const EVENT FLAG_TYPE_MASK = 0b00000110000;
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static const EVENT FLAG_TYPE_UNKNOWN = 0b00000000000;
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static const EVENT FLAG_TYPE_TOUCH = 0b00000010000;
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static const EVENT FLAG_TYPE_RELEASE = 0b00000100000;
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static const EVENT FLAG_LEVEL_SHIFT = 6;
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static const EVENT FLAG_LEVEL_MASK = 0b11111000000;
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static const EVENT FLAG_LEVEL_UNKNOWN = 0b00000000000;
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// clang-format on
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/**
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* This class implements a parser that translates event byte codes from the
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* Xiaomi Mijia Bedside Lamp 2 into usable events.
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*/
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class FrontPanelEventParser {
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public:
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/**
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* Parse the provided event byte code (7 bytes long).
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* Returns a unique integer event code that describes the parsed event.
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*/
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EVENT parse(uint8_t *m) {
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EVENT ev = FLAG_INIT;
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// All events use the prefix [04:04:01:00].
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if (m[0] != 0x04 || m[1] != 0x04 || m[2] != 0x01 || m[3] != 0x00) {
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return error_(ev, m, "prefix is not 04:04:01:00");
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}
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// The next byte determines the part that is touched.
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// All remaining bytes specify the event for that part.
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switch (m[4]) {
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case 0x01: // power button
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case 0x02: // color button
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ev |= (m[4] == 0x01 ? FLAG_PART_POWER : FLAG_PART_COLOR);
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if (m[5] == 0x01 && m[6] == (0x02 + m[4]))
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ev |= FLAG_TYPE_TOUCH;
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else if (m[5] == 0x02 && m[6] == (0x03 + m[4]))
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ev |= FLAG_TYPE_RELEASE;
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else
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return error_(ev, m, "invalid event type for button");
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break;
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case 0x03: // slider touch
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case 0x04: // slider release
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ev |= FLAG_PART_SLIDER;
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ev |= (m[4] == 0x03 ? FLAG_TYPE_TOUCH : FLAG_TYPE_RELEASE);
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if ((m[6] - m[5] - m[4] - 0x01) != 0)
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return error_(ev, m, "invalid slider level crc");
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else if (m[5] > 0x16 || m[5] < 0x01)
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return error_(ev, m, "out of bounds slider value");
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else {
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auto level = 0x17 - m[5];
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ev |= (level << FLAG_LEVEL_SHIFT);
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}
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break;
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default:
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return error_(ev, m, "invalid part id");
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return ev;
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}
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// All parsing rules passed. This event is valid.
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ESP_LOGD(TAG, "Front panel I2C event parsed: code=%d", ev);
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ev |= FLAG_OK;
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return ev;
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}
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protected:
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bool has_(EVENT ev, EVENT mask, EVENT flag) { return (ev & mask) == flag; }
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EVENT error_(EVENT ev, uint8_t *m, const char *msg) {
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ESP_LOGE(TAG, "Front panel I2C event error:");
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ESP_LOGE(TAG, " Error: %s", msg);
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ESP_LOGE(TAG, " Event: [%02x:%02x:%02x:%02x:%02x:%02x:%02x]", m[0], m[1], m[2], m[3], m[4], m[5], m[6]);
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ESP_LOGE(TAG, " Parsed part: %s", format_part(ev));
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ESP_LOGE(TAG, " Parsed event type: %s", format_event_type(ev));
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if (has_(ev, FLAG_PART_MASK, FLAG_PART_SLIDER)) {
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auto level = (ev & FLAG_LEVEL_MASK) >> FLAG_LEVEL_SHIFT;
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if (level > 0) {
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ESP_LOGE(TAG, " Parsed slider level: %d", level);
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}
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}
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return ev;
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}
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const char *format_part(EVENT ev) {
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if (has_(ev, FLAG_PART_MASK, FLAG_PART_POWER))
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return "power button";
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if (has_(ev, FLAG_PART_MASK, FLAG_PART_COLOR))
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return "color button";
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if (has_(ev, FLAG_PART_MASK, FLAG_PART_SLIDER))
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return "slider";
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return "n/a";
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}
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const char *format_event_type(EVENT ev) {
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if (has_(ev, FLAG_TYPE_MASK, FLAG_TYPE_TOUCH))
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return "touch";
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if (has_(ev, FLAG_TYPE_MASK, FLAG_TYPE_RELEASE))
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return "release";
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return "n/a";
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}
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};
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/**
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* This is a hardware abstraction layer that communicates with with front
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* panel of the Xiaomi Mijia Bedside Lamp 2.
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*
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* It serves as a hub component for other components that implement
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* the actual buttons and slider components.
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*/
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class FrontPanelHAL : public Component, public i2c::I2CDevice {
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public:
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FrontPanelEventParser event;
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/**
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* Set the GPIO pin that is used by the front panel to notify the ESP
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* that a touch/release event can be read using I2C.
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*/
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void set_trigger_pin(GPIOPin *pin) { trigger_pin_ = pin; }
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void add_on_event_callback(std::function<void(EVENT)> &&callback) { event_callback_.add(std::move(callback)); }
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void setup() {
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ESP_LOGCONFIG(TAG, "Setting up I2C trigger pin interrupt...");
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trigger_pin_->setup();
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trigger_pin_->attach_interrupt(FrontPanelHAL::isr, this, FALLING);
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}
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void dump_config() {
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ESP_LOGCONFIG(TAG, "FrontPanelHAL:");
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LOG_PIN(" I2C interrupt pin: ", trigger_pin_);
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}
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void loop() {
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// Read and publish front panel events.
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auto current_event_id = event_id_;
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if (current_event_id != last_event_id_) {
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last_event_id_ = current_event_id;
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MSG message;
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if (write_bytes_raw(READY_FOR_EV, MSG_LEN) && read_bytes_raw(message, MSG_LEN)) {
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auto ev = event.parse(message);
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if (ev & FLAG_OK) {
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event_callback_.call(ev);
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}
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}
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}
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if (led_state_ != last_led_state_) {
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update_leds();
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}
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}
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/**
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* Turn on one or more LEDs (leaving the state of the other LEDs intact).
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* The input value is a bitwise OR-ed set of LED constants.
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* Only after a call to update_leds() (handled by default from the main loop),
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* the new state will be activated.
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*/
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void turn_on_leds(uint16_t leds) {
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led_state_ = led_state_ | 0b0000110000000000 | leds;
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}
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/**
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* Turn off one or more LEDs (leaving the state of the other LEDs intact).
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* The input value is a bitwise OR-ed set of LED constants.
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* Only after a call to update_leds() (handled by default from the main loop),
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* the new state will be activated.
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*/
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void turn_off_leds(uint16_t leds) {
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led_state_ = (led_state_ | 0b0000110000000000) & ~leds;
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}
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/**
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* Updates the state of the LEDs according to the provided input.
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* The input value is a bitwise OR-ed set of LED constants, representing the
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* LEDs that must be turned on. All other LEDs are turned off.
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* Only after a call to update_leds() (handled by default from the main loop),
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* the new state will be activated.
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*/
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void set_leds(uint16_t leds) {
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turn_off_leds(LED_ALL);
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turn_on_leds(leds);
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}
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/**
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* Activate the LEDs according to the currently stored LED state. This method
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* will be called automatically by the main loop. You can call this method,
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* in case you need to update the LED state right away.
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*/
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void update_leds() {
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led_msg_[2] = led_state_ >> 8;
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led_msg_[3] = led_state_ & 0xff;
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write_bytes_raw(led_msg_, MSG_LEN);
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last_led_state_ = led_state_;
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}
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/**
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* Sets the front panel illumination to the provided level (0.0 - 1.0).
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*
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* This implements the behavior of the original firmware for representing
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* the lamp's brightness.
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*
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* Level 0.0 means: turn off the front panel illumination.
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* The other levels are translated to one of the available levels,
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* represented by the level indicator (i.e. the illumination of the
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* slider bar.) The power and color button are also turned on.
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*/
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void set_light_level(float level) {
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turn_off_leds(LED_ALL);
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if (level == 0.00f) return;
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turn_on_leds(LED_POWER | LED_COLOR | LED_1);
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if (level >= 0.15f) turn_on_leds(LED_2);
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if (level >= 0.25f) turn_on_leds(LED_3);
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if (level >= 0.35f) turn_on_leds(LED_4);
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if (level >= 0.45f) turn_on_leds(LED_5);
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if (level >= 0.55f) turn_on_leds(LED_6);
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if (level >= 0.65f) turn_on_leds(LED_7);
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if (level >= 0.75f) turn_on_leds(LED_8);
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if (level >= 0.85f) turn_on_leds(LED_9);
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if (level >= 0.95f) turn_on_leds(LED_10);
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}
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protected:
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GPIOPin *trigger_pin_;
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static void isr(FrontPanelHAL *store);
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volatile int event_id_ = 0;
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int last_event_id_ = 0;
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CallbackManager<void(EVENT)> event_callback_{};
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uint16_t led_state_ = 0;
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uint16_t last_led_state_ = 0;
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MSG led_msg_ = {0x02, 0x03, 0x00, 0x00, 0x64, 0x00, 0x00};
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};
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/**
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* This ISR is used to handle IRQ triggers from the front panel.
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*
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* The front panel pulls the trigger pin low for a short period of time
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* when a new event is available. All we do here to handle the interrupt,
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* is increment a simple event id counter. The main loop of the component
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* will take care of actually reading and processing the event.
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*/
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void ICACHE_RAM_ATTR HOT FrontPanelHAL::isr(FrontPanelHAL *store) { store->event_id_++; }
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} // namespace bslamp2
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} // namespace xiaomi
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} // namespace esphome
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