114 Zeilen
4.3 KiB
C++
114 Zeilen
4.3 KiB
C++
/**
|
|
* @file lora.hpp
|
|
* @brief Thread-safe asynchronous Semtech SX1276 LoRa transceiver driver interface.
|
|
* @author OM Tom (OE3TKT)
|
|
*
|
|
* @license SPDX-License-Identifier: MIT
|
|
* @copyright Copyright (c) 2026 OM Tom (OE3TKT)
|
|
* For the full license terms, see the LICENSE file in the project root.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "driver/gpio.h"
|
|
#include "driver/spi_master.h"
|
|
#include "freertos/FreeRTOS.h"
|
|
#include "freertos/semphr.h"
|
|
#include "freertos/task.h"
|
|
#include "lora_types.hpp"
|
|
|
|
|
|
/**
|
|
* @brief Controller class orchestrating hardware configurations, data transfers, and metrics collection.
|
|
*/
|
|
class LoraController {
|
|
public:
|
|
|
|
/**
|
|
* @brief Simple internal abstraction layer mirroring the raw incoming packet payload.
|
|
*/
|
|
struct LoraPacket {
|
|
float rssi; /**< High-precision calibrated received signal power in dBm. */
|
|
float snr; /**< High-precision calibrated signal-to-noise ratio in dB. */
|
|
uint8_t length; /**< Payload size explicitly specified in bytes. */
|
|
uint8_t payload[256]; /**< Fixed internal memory buffer capturing raw ingress bytes. Max SX1276 FIFO is 256. */
|
|
};
|
|
|
|
|
|
explicit LoraController();
|
|
virtual ~LoraController();
|
|
|
|
// Disallow copying to prevent duplicate hardware resource assignment
|
|
LoraController(const LoraController&) = delete;
|
|
LoraController& operator=(const LoraController&) = delete;
|
|
|
|
/**
|
|
* @brief Configures peripheral resources and registers the background worker thread on Core 1.
|
|
* @param priority Scheduler task priority level execution metric.
|
|
*/
|
|
void startTask(uint32_t priority = 6);
|
|
|
|
/**
|
|
* @brief Transmits a raw data frame onto the physical radio frequency layer.
|
|
* @param buffer Pointer to the source byte array holding the packet context.
|
|
* @param length Total number of bytes to dispatch over the air interface.
|
|
* @return esp_err_t status indicating transaction success.
|
|
*/
|
|
esp_err_t transmitFrame(const uint8_t* buffer, uint8_t length);
|
|
|
|
/**
|
|
* @brief Dynamically updates the transceiver operating frequency at runtime.
|
|
* @param msb Most Significant Byte of the frequency fraction.
|
|
* @param mid Middle Significant Byte of the frequency fraction.
|
|
* @param lsb Least Significant Byte of the frequency fraction.
|
|
*/
|
|
// void setFrequency(uint8_t msb, uint8_t mid, uint8_t lsb);
|
|
|
|
/**
|
|
* @brief Thread-safely updates the operational state tracking variables and overrides transceiver registers.
|
|
* @param freq_hz Core RF targeting frequency structured in absolute Hertz scale units.
|
|
*/
|
|
void setFrequency(uint32_t freq_hz);
|
|
|
|
/**
|
|
* @brief Dynamically updates the LoRa signal bandwidth at runtime.
|
|
* @param bw_khz Target bandwidth in kHz (e.g., 62, 125, 250, 500).
|
|
*/
|
|
void setBandwidth(uint32_t bw_khz);
|
|
|
|
private:
|
|
static const char* TAG;
|
|
|
|
spi_device_handle_t m_spiHandle = nullptr;
|
|
TaskHandle_t m_taskHandle = nullptr;
|
|
SemaphoreHandle_t m_isrSemaphore = nullptr;
|
|
|
|
LoraStateTable m_state; ///< Internal volatile tracking record data context.
|
|
SemaphoreHandle_t m_stateMutex = nullptr; ///< Mutex primitive enforcing mutual exclusion over m_state modifications.
|
|
|
|
|
|
static void taskTrampoline(void* pvParameters);
|
|
static void IRAM_ATTR gpioIsrHandler(void* arg);
|
|
|
|
void run();
|
|
uint8_t readRegister(uint8_t address);
|
|
void writeRegister(uint8_t address, uint8_t value);
|
|
|
|
esp_err_t initializeHardware();
|
|
void setModeReceiver();
|
|
|
|
void applyModemConfig();
|
|
|
|
/**
|
|
* @brief Evaluates raw register readings into calibrated RSSI and SNR telemetry metrics.
|
|
* @details Automatically compensates the RSSI offset base based on the active carrier frequency
|
|
* band (Low-Band vs High-Band boundary at 525 MHz) as well as sub-noise SNR conditions.
|
|
* @param rawRssi The raw digital output read from RegRssiValue (0x1A).
|
|
* @param rawSnr The raw digital twos-complement output read from RegPktSnrValue (0x1B).
|
|
* @param[out] outRssi Reference destination pointer receiving the calibrated RSSI value in dBm.
|
|
* @param[out] outSnr Reference destination pointer receiving the calibrated SNR value in dB.
|
|
*/
|
|
void calculateTelemetry(uint8_t rawRssi, uint8_t rawSnr, float& outRssi, float& outSnr);
|
|
|
|
};
|