simple code for S2LP

Son, Dong-Seong · ‎2025-06-10

Hello,
Could you please provide a simple example source code to operate an S2-LP transceiver under the following conditions? My MCU is an STM32F103 connected via SPI1.

A 25 MHz crystal is fitted to the S2-LP.
External SMPS (1.8 V) is used.
I want to transmit at 420 MHz with 0 dBm output power.
Data rate is 10 kbps, using 2-GFSK modulation with 20 kHz frequency deviation.
Payload is any 20 bytes of data.

Thank you!

Andrew Neil · ‎2025-06-11

Have you looked on the 'Tools & Software' tab of the Product Page:

https://www.st.com/en/wireless-connectivity/s2-lp.html#tools-software

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.