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LoRa-STM32WLE5 SoC Wireless Module Demo Evaluation Board
LoRa-STM32WLE5 SoC demo board enables simple LoRa communication between two modules. After power-on, the board waits to receive (slave mode). Pressing the TX button makes it the master, sending “send_test” and awaiting “return_test.” The exchange continues cyclically. Red LED indicates transmit, blue LED receive. If both boards’ TX or RX windows sync (no response), restart one board to resume normal communication.
I. Internal Block Diagram
II. UART Function
(1) Data Transmission Process
When using the UART data transmission mode, the module must be powered on again.
This function allows the user to send data from a serial terminal (such as a serial assistant tool) to the wireless module.
After receiving the data, the module transmits it wirelessly to another module.
Finally, the received data is displayed on the serial assistant connected to the other module.
(2) UART Configuration Parameters
| Parameter | Value |
|---|---|
| Baud Rate | 115200 bps |
| Data Bits | 8 |
| Stop Bits | 1 |
| Parity | None |
(3) UART Data Packet Format
Each data packet consists of the actual data followed by a carriage return (newline) as the end marker.
Detailed format:
III. Parameter Configuration
| Category | Parameter | Value | Description |
|---|---|---|---|
| TX/RX Configuration | RF_FREQUENCY | 433000000 | Transmit frequency |
| RX_TIMEOUT_VALUE | 0 | Receive timeout duration | |
| TX_TIMEOUT_VALUE | 1000 | Transmit timeout duration | |
| LoRa SetTXConfig Parameters | TX_OUTPUT_POWER | 22 | Output power (dBm) |
| LORA_BANDWIDTH | 500 kHz | Signal bandwidth | |
| LORA_SPREADING_FACTOR | 7 | Spreading factor | |
| LORA_CODINGRATE | 7 | Coding rate | |
| LORA_PREAMBLE_LENGTH | 8 | Preamble length | |
| LORA_SYMBOL_TIMEOUT | 5 | Symbol timeout | |
| LORA_FIX_LENGTH_PAYLOAD_ON | false | Fixed payload length | |
| LORA_IQ_INVERSION_ON | false | IQ inversion |
IV. Pin Description
| Signal | GPIO | Software Definition |
|---|---|---|
| TX Button | PB4 | KEY_TX_Pin |
| RX Indicator LED | PB5 | LED_RX_Pin |
| TX Indicator LED | PB3 | LED_TX_Pin |
| CS Pin | PA0 | CS_Pin |