STM32WL55 LORA Ping pong example

This is an example of LORA communication between STM32WL55 cards, and the frequency band of 868 ~ 928Mhz is used.
Long-distance wireless communication of up to 30Km is possible, and it has advantages in space, low power, and price compared to the structure that generally uses SX1276 + separate MCU.

Related hardware kits can be purchased from the Naver Smart Store.

Purchase Link : naver smart store

You can purchase it by contacting sales@axden.io

---

STM32WL55 LORA Ping pong terminal

baudrate : 9600

TX

RX

---

STM32WL55 Radio setup

SubGHZ-Phy / App / subghz_phy_app.c

#define REGION_AS923

#if defined( REGION_AS923 )

#define RF_FREQUENCY                                923000000 // Hz

#elif defined( REGION_AU915 )

#define RF_FREQUENCY                                915000000 // Hz

#elif defined( REGION_CN470 )

#define RF_FREQUENCY                                470000000 // Hz

#elif defined( REGION_CN779 )

#define RF_FREQUENCY                                779000000 // Hz

#elif defined( REGION_EU433 )

#define RF_FREQUENCY                                433000000 // Hz

#elif defined( REGION_EU868 )

#define RF_FREQUENCY                                868000000 // Hz

#elif defined( REGION_KR920 )

#define RF_FREQUENCY                                920000000 // Hz

#elif defined( REGION_IN865 )

#define RF_FREQUENCY                                865000000 // Hz

#elif defined( REGION_US915 )

#define RF_FREQUENCY                                915000000 // Hz

#elif defined( REGION_RU864 )

#define RF_FREQUENCY                                864000000 // Hz

#else
#error "Please define a frequency band in the compiler options."
#endif

#define TX_OUTPUT_POWER 14

#define LORA_BANDWIDTH                              0         // [0: 125 kHz,
//  1: 250 kHz,
//  2: 500 kHz,
//  3: Reserved]
#define LORA_SPREADING_FACTOR                       10         // [SF7..SF12]
#define LORA_CODINGRATE                             1         // [1: 4/5,
//  2: 4/6,
//  3: 4/7,
//  4: 4/8]
#define LORA_PREAMBLE_LENGTH                        8         // Same for Tx and Rx
#define LORA_SYMBOL_TIMEOUT                         5         // Symbols
#define LORA_FIX_LENGTH_PAYLOAD_ON                  false
#define LORA_IQ_INVERSION_ON                        false

#define TX_BUFFER_SIZE 128
#define RX_BUFFER_SIZE 128

---

Note

Works with STM32CubeIDE Version: 1.8.0, freeRTOS CMSIS_V2, Single-core

STM32WL55 module only support RFO_H

RF Switch IC MPN : BGS12SN6E6327XTSA1

---

STM32WL55 Pin map