board/main/ui_input.c

#pragma once

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "config_key.h"
#include "driver/gpio.h"
#include "embedded_display.c"
#include "freertos/FreeRTOS.h"
#include "freertos/queue.h"
#include "freertos/task.h"
#include "light.c"
#include "pca9555.c"

#define ENCODER_0_CLK_PORT_IO CONFIG_ENCODER_0_CLK_PORT_IO
#define ENCODER_0_DT_PORT_IO CONFIG_ENCODER_0_DT_PORT_IO
#define ENCODER_0_SW_PORT_IO CONFIG_ENCODER_0_SW_PORT_IO
#define ENCODER_1_CLK_PORT_IO CONFIG_ENCODER_1_CLK_PORT_IO
#define ENCODER_1_DT_PORT_IO CONFIG_ENCODER_1_DT_PORT_IO
#define ENCODER_1_SW_PORT_IO CONFIG_ENCODER_1_SW_PORT_IO
#define ENCODER_INT_GPIO GPIO_NUM_3
#define ESP_INTR_FLAG_DEFAULT 0

#define RISING_EDGE_NOT_ROTATING 0b00000000
#define RISING_EDGE_CLOCKWISE 0b10000000
#define RISING_EDGE_COUNTER_CLOCKWISE 0b11000000
#define RISING_EDGE_ROTATING_MASK 0b11000000

#define FALLING_EDGE_NOT_ROTATING 0b00000000
#define FALLING_EDGE_CLOCKWISE 0b00100000
#define FALLING_EDGE_COUNTER_CLOCKWISE 0b00110000
#define FALLING_EDGE_ROTATING_MASK 0b00110000

static const char *UI_INPUT_TAG = "UiInput";

static xQueueHandle ui_input_event = NULL;
static xQueueHandle ui_input_raw_event = NULL;

typedef struct encoder_state {
  e_ui_input_raw_key_t key;
  uint8_t bits;   // rising_edge_rotation_direction,
                  // falling_edge_rotation_direction, dt, clk, sw
  uint8_t value;  // dt, clk, sw
} encoder_state_t;

static encoder_state_t encoder_0_state = {.key = ui_input_raw_key_encoder_0,
                                          .bits = 0};
static encoder_state_t encoder_1_state = {.key = ui_input_raw_key_encoder_1,
                                          .bits = 0};

uint8_t level_byte;
int8_t delta = 0;
char changing_str[12] = "NC";

static void IRAM_ATTR gpio_isr_handler(void *arg) {
  xQueueSendFromISR(ui_input_raw_event, NULL, NULL);
}

static void ui_input_update_embedded_display(void *arg) {
  s_ui_input_t input;
  char changing_str[12] = "NC";
  for (;;) {
    if (xQueueReceive(ui_input_event, &input, portMAX_DELAY)) {
      switch (input.key) {
        case ui_input_key_display_0_brightness:
          sprintf(changing_str, "Dis0: % 3d", input.value);
          break;
        case ui_input_key_display_1_brightness:
          sprintf(changing_str, "Dis1: % 3d", input.value);
          break;
        case ui_input_key_computer_volume:
          sprintf(changing_str, "CVol: % 3d", input.value);
          break;
        case ui_input_key_display_ambient_lighting_level:
          sprintf(changing_str, "ALLv: % 3d", display_ambient_lighting_level);
          break;
        case ui_input_key_display_ambient_lighting_mode:
          sprintf(changing_str, "ALMd: % 3d", input.value);
          break;
        case ui_input_key_display_0_mode:
          sprintf(changing_str, "Dis0M: % 2d", input.value);
          break;
        case ui_input_key_display_1_mode:
          sprintf(changing_str, "Dis1M: % 2d", input.value);
          break;

        default:
          strcpy(changing_str, "NC");
          break;
      }
      display_fill_rect(0, 6, 128, 8, 0);
      display_print8_str(8, 6, changing_str);
    }
  }
}

static void encoder_value_change(encoder_state_t *state) {
  if ((state->value >> 1 & 1) == (state->bits >> 1 & 1)) {
    return;
  }

  state->bits = (state->bits & 0b11111000) | (state->value & 0b111);
  if (state->value >> 1 & 1) {
    state->bits = (state->bits & (~RISING_EDGE_ROTATING_MASK)) | 0x80 |
                  ~(state->value >> 2 & 1) << 6;
    if (((state->bits & FALLING_EDGE_ROTATING_MASK) >> 4) ==
        ((state->bits & RISING_EDGE_ROTATING_MASK) >> 6)) {
      if ((state->bits & RISING_EDGE_ROTATING_MASK) == RISING_EDGE_CLOCKWISE) {
        delta = -1;
      } else {
        delta = 1;
      }
      state->bits = (state->bits & (~FALLING_EDGE_ROTATING_MASK)) |
                    FALLING_EDGE_NOT_ROTATING;
    } else {
      delta = 0;
      if ((state->bits & FALLING_EDGE_ROTATING_MASK) !=
          FALLING_EDGE_NOT_ROTATING) {
        state->bits = (state->bits & (~FALLING_EDGE_ROTATING_MASK)) |
                      FALLING_EDGE_NOT_ROTATING;
      }
    }
  } else {
    state->bits = (state->bits & (~FALLING_EDGE_ROTATING_MASK)) | 0x20 |
                  (state->value >> 2 & 1) << 4;
    if (((state->bits & FALLING_EDGE_ROTATING_MASK) >> 4) ==
        ((state->bits & RISING_EDGE_ROTATING_MASK) >> 6)) {
      if ((state->bits & FALLING_EDGE_ROTATING_MASK) ==
          FALLING_EDGE_CLOCKWISE) {
        delta = -1;
      } else {
        delta = 1;
      }
      state->bits = (state->bits & (~RISING_EDGE_ROTATING_MASK)) |
                    RISING_EDGE_NOT_ROTATING;

    } else {
      delta = 0;
      if ((state->bits & RISING_EDGE_ROTATING_MASK) !=
          RISING_EDGE_NOT_ROTATING) {
        state->bits = (state->bits & (~RISING_EDGE_ROTATING_MASK)) |
                      RISING_EDGE_NOT_ROTATING;
      }
    }
  }

  if (delta == 0) {
    return;
  }

  s_ui_input_t event = {.value = delta};
  if (state->key == ui_input_raw_key_encoder_0) {
    if (state->value & 1) {
      event.key = ui_input_key_computer_volume;
    } else {
      event.key = ui_input_key_display_0_brightness;
    }
  } else if (state->key == ui_input_raw_key_encoder_1) {
    if (state->value & 1) {
      event.key = ui_input_key_display_ambient_lighting_level;
      led_strip_set_brightness(display_ambient_lighting_level + delta);
    } else {
      event.key = ui_input_key_display_1_brightness;
    }
  }
  xQueueSend(ui_input_event, &event, NULL);
}

static void ui_input_raw_handler(void *arg) {
  for (;;) {
    if (xQueueReceive(ui_input_raw_event, NULL, portMAX_DELAY)) {
      pca9555_read_one_input(PCA95555_CMD_INPUT_PORT_1, &level_byte);

      encoder_0_state.value = level_byte & 0x7;
      encoder_value_change(&encoder_0_state);
      encoder_1_state.value = level_byte >> 3 & 0x7;
      encoder_value_change(&encoder_1_state);
    }
  }
}

void ui_input_init(void) {
  // zero-initialize the config structure.
  gpio_config_t io_conf = {};

  io_conf.mode = GPIO_MODE_INPUT;
  io_conf.pull_up_en = 1;
  io_conf.pull_down_en = 0;
  // interrupt of rising edge
  io_conf.intr_type = GPIO_INTR_NEGEDGE;
  io_conf.pin_bit_mask = 1ULL << ENCODER_INT_GPIO;
  gpio_config(&io_conf);

  // start encoder task
  ui_input_event = xQueueCreate(10, sizeof(s_ui_input_t));
  ui_input_raw_event = xQueueCreate(10, 0);

  // hook isr handler for specific gpio pin
  gpio_isr_handler_add(ENCODER_INT_GPIO, gpio_isr_handler, NULL);

  xTaskCreate(ui_input_update_embedded_display, "ui_input_event", 2048, NULL,
              10, NULL);
  xTaskCreate(ui_input_raw_handler, "ui_input_event", 2048, NULL, 10, NULL);
}