SX1262-HDK-dat

• rf-switch-dat - network-dat

• lora-HDK-dat

• LORA-HDK-dat - SX1262-HDK-dat - SX1262-dat

• SX1262-MD1-dat

wiring

Typical Minimum Connections (MCU)

	SX1262	MCU	arduino	DVA1009-dat
	VDD_IN	3.3V
	VSS	GND
	NSS	GPIO
	SCK	SPI SCK
	MOSI	SPI MOSI
	MISO	SPI MISO
	BUSY	GPIO (input)	D3	3
DIO1	DIO1	GPIO (interrupt)	D5	2
	NRST	GPIO (reset)	A0	9
	DIO2	x
	DIO3	x

---

Important Wiring Notes

• BUSY pin must be monitored before any SPI command
• DIO1 is mandatory for RX/TX interrupt handling
• RF pins require impedance matching (do not connect antenna directly)
• Use short traces and good grounding for RF stability

wiring while NOT using DIO2 control TXEN / RXEN of RF switch

(NSS_d + SCK + MOSI + MISO) + BUSY + DIO1_irq + RXEN + TXEN + RESET_optional

✅ Required Pins (Basic SPI Communication)

Pin	Required	Purpose
NSS_d (CS)	✅ Yes	SPI chip select (NSS)
SCK	✅ Yes	SPI clock
MOSI	✅ Yes	SPI data from MCU to SX1262
MISO	✅ Yes	SPI data from SX1262 to MCU
BUSY	✅ Yes	Indicates radio busy status

🧠 BUSY must be monitored before and after sending SPI commands to ensure the radio is ready.

---

⚠️ Conditional / Optional Pins

Pin	Required?	When Needed
RESET	⚠️ Optional	Recommended for better stability; allows hard reset
DIO1	⚠️ Optional	Required if using interrupt-based handling (e.g., RX done, TX done)
DIO2	⚠️ Optional	Required only if using for RF switch/FEM control via SetDio2AsRfSwitchCtrl(true)
RXEN	❌ No	Not needed if using DIO2 for single-pin FEM control
TXEN	❌ No	Same as above

def in UserConfig.h

//spi
#define LCC68_NSS_PORT   GPIOA
#define LCC68_NSS_PIN    GPIO_PIN_4

#define LCC68_SCK_PORT   GPIOA
#define LCC68_SCK_PIN    GPIO_PIN_5

#define LCC68_MOSI_PORT  GPIOA
#define LCC68_MOSI_PIN   GPIO_PIN_7

#define LCC68_MISO_PORT  GPIOA
#define LCC68_MISO_PIN   GPIO_PIN_6

#define LCC68_NRST_PORT GPIOA
#define LCC68_NRST_PIN  GPIO_PIN_3

#define LCC68_BUSY_PORT GPIOA
#define LCC68_BUSY_PIN  GPIO_PIN_2

#define LCC68_DIO1_PORT GPIOC
#define LCC68_DIO1_PIN  GPIO_PIN_15

#define LCC68_RXEN_PORT GPIOA
#define LCC68_RXEN_PIN  GPIO_PIN_1

#define LCC68_TXEN_PORT GPIOA
#define LCC68_TXEN_PIN  GPIO_PIN_0

//Uart
#define LOG_UART_TX_PORT GPIOA
#define LOG_UART_TX_PIN  GPIO_PIN_9
#define LOG_UART_RX_PORT GPIOA
#define LOG_UART_RX_PIN  GPIO_PIN_10


#define LORA_FRE                                    915000000   // frequency
#define LORA_PREAMBLE_LENGTH                        8        // PREAMBLE LENGTH
#define LORA_SX126x_SYMBOL_TIMEOUT                  0         // Symbols(SX126x)
#define LORA_FIX_LENGTH_PAYLOAD_ON                  false           // PAYLOAD FIX LENGTH
#define LORA_IQ_INVERSION_ON                        false           // IQ INVERSION

#define SIZE_DATA  255

wiring while DIO2 control TXEN / RXEN of RF switch

NSS_d + SCK + MOSI + MISO + BUSY + DIO2 (Optional: RESET + DIO1)

   Microcontroller                   SX1262                        RF Switch / FEM
 +-------------------+         +---------------+               +---------------------+
 |                   |         |               |               |                     |
 |        MISO <-----+---------+ MISO          |               |                     |
 |        MOSI ----->+---------+ MOSI          |               |                     |
 |        SCK  ----->+---------+ SCK           |               |                     |
 |        NSS  ----->+---------+ NSS           |               |                     |
 |        RESET ---->+---------+ NRESET        |               |                     |
 |                   |         |               |               |                     |
 |        GND  ------+---------+ GND           |---------------+ GND                 |
 |        3.3V ------+---------+ VDD           |---------------+ VCC (3.3V)          |
 |                   |         |               |               |                     |
 |                   |         | RF_IO ------- +---------------- RF_IO               |
 |                   |         |               |               |                     |
 |                   |         | DIO2 ---------+---------------> CTRL (TX/RX EN)     |
 |                   |         |               |               |                     |
 +-------------------+         +---------------+               +---------------------+

wiring in table

Pin	Name	Connects To Purpose
NSS	MCU GPIO (CS)	SPI chip select
SCK	MCU SPI clock	SPI clock line
MOSI	MCU SPI MOSI	SPI data to SX1262
MISO	MCU SPI MISO	SPI data from SX1262
DIO2	FEM CTRL / TXEN	Auto RF switch control
RF_IO	RF switch input	RF path in/out
NRESET	MCU GPIO (optional)	SX1262 reset pin
VDD	3.3V	Power supply
GND	Ground	Common ground

coding

// Enable automatic RF switch control on DIO2
Radio.SetDio2AsRfSwitchCtrl(true);

// Set DIO2 as output (only needed if using raw DIO2 control in some cases)
Radio.SetDioAsOutput(2); // Not always required