🚀 LoRa1262 STM32 HAL Driver

A highly optimized STM32 HAL-based driver for the LoRa1262 (SX1262) module, enabling LoRa communication using SPI. This project is built for STM32CubeIDE and is designed for low-power, long-range wireless communication.

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🛠 Features

✅ Full-duplex SPI communication with SX1262
✅ LoRa packet transmission and reception
✅ Interrupt-based packet handling
✅ Standby, Receive, and Transmit modes
✅ Adjustable frequency, bandwidth, spreading factor, and coding rate
✅ Low-power mode for energy efficiency
✅ Error handling & status monitoring

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🏗 Hardware Requirements

• LoRa1262 Module (SX1262)
• STM32 Microcontroller (Tested on STM32G0, STM32F4, etc.)
• SPI-compatible connections
• 3.3V Power Supply
• ST-Link Debugger (Optional)

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📌 Pin Configuration (SPI Interface)

STM32 Pin	SX1262 Pin	Description
MOSI (PA7)	MOSI	SPI Data Input
MISO (PA6)	MISO	SPI Data Output
SCK (PA5)	SCK	SPI Clock
NSS (PA4)	NSS	Chip Select
RESET (PB0)	RESET	Module Reset
BUSY (PB1)	BUSY	Module Busy Pin
DIO1 (PB2)	DIO1	Interrupt Pin
GND	GND	Ground
3.3V	VCC	Power Supply

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📂 Project Structure

├── Core/
│   ├── Src/             # Source files
│   ├── Inc/             # Header files
│   ├── main.c           # Main application
│   ├── spi.c            # SPI communication
│   ├── gpio.c           # GPIO control
│   ├── uart.c           # Debugging via UART
│   └── stm32_hal/       # HAL Libraries
├── Drivers/             # STM32 HAL Drivers
├── Libs
|   ├── Src/             # Source files
|       ├──SX1262.c
|   ├── SX1262.h
|   ├── SX1262_Definitions.h
├── README.md            # Documentation
├── .gitignore           # Git ignore file
└── LORA_1262f30_Receive.ioc         # STM32CubeMX project file

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⚙️ Software Setup

1️⃣ Clone the Repository

git clone https://github.com/Saba-abiri/LORA1262.git
cd LORA1262

2️⃣ Open in STM32CubeIDE

• Import the .ioc file in STM32CubeMX
• Configure SPI and GPIO settings
• Generate project files

3️⃣ Configure SPI in STM32CubeMX

• SPI Mode: SPI Mode 0
• Baud Rate: ≤10MHz
• Data Size: 8-bit

4️⃣ Build & Flash the Firmware

• Compile the project
• Upload to STM32 using ST-Link

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📡 Usage

configuration for the SX1262 LoRa transceiver

  SX1262_Get_st()->Busy_Pin = BUSY_LORA_Pin;
	SX1262_Get_st()->Busy_Port= BUSY_LORA_GPIO_Port;
	SX1262_Get_st()->NSS_Pin = NSS_LORA_Pin;
	SX1262_Get_st()->NSS_Port = NSS_LORA_GPIO_Port;
	SX1262_Get_st()->Reset_Pin = NRESET_LORA_Pin;
	SX1262_Get_st()->Reset_Port = NRESET_LORA_GPIO_Port;
	SX1262_Get_st()->SPI = hspi1;

Initialize LoRa1262

Call the initialization function in main.c:

SX1262_Init();

Send a LoRa Packet

uint8_t data[] = "Hello, LoRa!";
SX1262_Transmit(data, sizeof(data));

Receive a LoRa Packet

set to recive mode

SX1262_setModeReceive();

wait till DI01 intterupt appears!

uint8_t rxBuffer[255];
uint8_t packetLength;
SX1262_HandleCallback(rxBuffer, &packetLength);

Change LoRa Frequency

SX1262_SetFrequency(433000000); // Set to 433 MHz

Change Operating Mode

SX1262_setModeReceive(); // Receive Mode
SX1262_setModeStandby(); // Standby Mode

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🔧 Functions Overview

Function	Description
SX1262_Init()	Initializes the LoRa1262 module
SX1262_Transmit(uint8_t*, uint8_t)	Sends a LoRa packet
SX1262_HandleCallback(uint8_t*, uint8_t*)	Handles LoRa packet reception
SX1262_SetFrequency(uint32_t freq)	Sets the LoRa frequency
SX1262_setModeReceive()	Switches to Receive Mode
SX1262_setModeStandby()	Switches to Standby Mode
SX1262_getstatus()	Gets module status
SX1262_IsBusy()	Checks if the module is busy
SX1262_BusyWait()	Waits until the module is free

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⚠️ Troubleshooting

Issue	Possible Cause	Solution
❌ No response from SX1262	Incorrect SPI wiring	Check connections
❌ Transmission failure	Wrong frequency or power settings	Verify settings in SX1262_SetFrequency()
❌ Packet loss	Low signal strength or interference	Increase power, adjust SF, BW

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📌 To-Do

• Implement CRC checks for packet integrity
• Add FSK modulation support
• Improve low-power consumption

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📜 License

This project is open-source under the MIT License. Feel free to use, modify, and contribute!

🔗 References:

• SX1262 Datasheet

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💡 Developed by Saba Abiri 🚀

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