// SPDX-License-Identifier: MIT
// SPDX-FileCopyrightText: 2026 A.M. Rowsell <amr@frzn.dev>

#include "aht.h"

#include "hardware/i2c.h"
#include "pico/stdlib.h" // IWYU pragma: keep

static const uint8_t AHT_MEASURE[3] = {0xAC, 0x33, 0x00};

void getAHTData(i2c_inst_t *i2c, double *t, double *h) {
  uint8_t result[6];
  uint32_t temperature;
  uint32_t humidity;

  i2c_write_timeout_us(i2c, AHT_ADDR, AHT_MEASURE, 3, false,
                       1200); // trigger measurement
  // now we must delay ~100ms
  sleep_ms(100);
  i2c_read_timeout_us(i2c, AHT_ADDR, result, 6, false,
                      3000); // read 6 bytes back
  humidity = (result[1] << 12) | (result[2] << 4) | (result[3] & 0xF0) >> 4;
  temperature = (result[3] & 0x0F) << 16 | (result[4] << 8) | result[5];
  *t = (((double)temperature / 1048576.0f) * 200.0f) - 50.0f;
  *h = ((double)humidity / 1048576.0f) * 100.0f;
  return;
}