vl53l0x.h

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// Copyright (C) 2026 Douglas Quigg (dstroy0) <dquigg123@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-or-later
 
/**
 * @file vl53l0x.h
 * @brief ST VL53L0X / VL53L1X optical time-of-flight ranging codec (DETWS_ENABLE_VL53L0X).
 *
 * The VL53L0X emits an infrared pulse and times the round-trip to a target, reporting distance in
 * millimeters - contactless ranging and gesture, bridged to the same telemetry sink as the other field
 * sensors. Its documented register interface is small: check IDENTIFICATION_MODEL_ID (0xC0 == 0xEE),
 * start ranging via SYSRANGE_START, poll RESULT_INTERRUPT_STATUS for data-ready, read the 16-bit range
 * from RESULT_RANGE_STATUS + 10, then clear the interrupt.
 *
 * This codec is pure and host-tested: ::vl53l0x_range_mm combines the range register pair,
 * ::vl53l0x_data_ready decodes the interrupt-status byte, and ::vl53l0x_range_valid checks the device
 * range-status field. On an ESP32 the binding runs the ranging loop over I2C (Wire); only that touches
 * hardware. Note: ST's optional tuning blob (for best accuracy) is not applied - default-settings
 * ranging via the documented registers.
 */
 
#ifndef DETERMINISTICESPASYNCWEBSERVER_VL53L0X_H
#define DETERMINISTICESPASYNCWEBSERVER_VL53L0X_H
 
#include <stdint.h>
 
#define VL53L0X_REG_SYSRANGE_START 0x00
#define VL53L0X_REG_SYSTEM_INTERRUPT_CLEAR 0x0B
#define VL53L0X_REG_RESULT_INTERRUPT_STATUS 0x13
#define VL53L0X_REG_RESULT_RANGE_STATUS 0x14
#define VL53L0X_REG_IDENTIFICATION_MODEL_ID 0xC0
 
#define VL53L0X_MODEL_ID 0xEE  ///< IDENTIFICATION_MODEL_ID for the VL53L0X.
#define VL53L0X_RANGE_VALID 11 ///< DeviceRangeStatus value that means a valid measurement.
 
/** @brief Combine the range high/low bytes (RESULT_RANGE_STATUS+10 / +11) into millimeters. */
uint16_t vl53l0x_range_mm(uint8_t hi, uint8_t lo);
 
/** @brief True if a new measurement is ready (any of the low 3 interrupt-status bits set). */
bool vl53l0x_data_ready(uint8_t interrupt_status);
 
/** @brief The DeviceRangeStatus field (bits 6:3) of the RESULT_RANGE_STATUS register. */
uint8_t vl53l0x_range_status(uint8_t range_status_reg);
 
/** @brief True if the range-status field reports a valid measurement (== VL53L0X_RANGE_VALID). */
bool vl53l0x_range_valid(uint8_t range_status_reg);
 
// --- ESP32 binding (I2C via Wire; no-ops on a host build) ------------------------------------
 
/** @brief Verify the model id and start continuous back-to-back ranging at @p addr. @return present + ack. */
bool vl53l0x_begin(uint8_t addr);
 
/**
 * @brief If a measurement is ready, read the distance into @p mm and clear the interrupt.
 * @return true on a fresh, valid reading; false if not ready / invalid / I2C error.
 */
bool vl53l0x_read_mm(uint16_t *mm);
 
#endif // DETERMINISTICESPASYNCWEBSERVER_VL53L0X_H