STM32WL - 1st microcontroller SoC with LoRa

[rcolistete]

STM32WL - 1st microcontroller SoC family with LoRa, was announced in January 2020 :
https://www.st.com/en/microcontrollers- ... eries.html
https://www.st.com/content/st_com/en/pr ... 2wlex.html
https://blog.st.com/stm32wl/
https://www.st.com/resource/en/datashee ... wle5jc.pdf
It doesn't have WiFi, neither Bluetooth, only SX126x LoRa transceiver, so it will be useful as LoRa(Wan) node. The STM32WLE5 is a low power MCU, with low frequency (48 MHz), up to 64KB of RAM, up to 256 kB of internal flash, with many low power modes :
- deepsleep : 31 nA (shutdown), 360 nA (standby with RTC), 1.07 µA (stop2 with RTC);
- < 72 µA/MHz without LoRa, x 48 MHz = 3,456 mA;
- 5.4 mA in LoRa RX;
- 15-87 mA in LoRa TX (10-20 dBm).
- MCU runs @ 2 MHz consuming 0.6-0.7 mA;
- it has LPRun (Low Power Run) mode, @ 2 MHz consumes 0.22 mA, while @ 0,4 MHz consumes only 52 uA.

Since November 2020 there is a LoRa-E5 STM32WLE5JC module from SeeedStudio, US$9.90 (first batch of the module is sold out, now it is again in pre-order).

So let us share the MicroPython port efforts in this topic. There was already some MicroPython community interest since January 2020 Melbourne MicroPython Meetup.

[mattyt]

Unfortunately the Nucleo-WL55JC development board for this chip just doesn't seem available (at least the JC1 variant I'd need in Australia). If it were I'd be very keen to work on a MicroPython port! I just don't have time to design/build my own board...

[rcolistete]

The SeeedStudio LoRa-E5 module seems to be simple to use (just few components to make a board using it). But I haven't succeded to buy one from 1st batch.

I hope that it is just a matter of time to have some development boards with STM32WL available (in 2021).

[micado2]

Hello guys,
Nucleo with WL seems available for all countries --> https://www.st.com/en/evaluation-tools/ ... sample-buy
I'm also very interested by a FW for STM32WL nucleo board!

[mattyt]

Nucleo with WL seems available for all countries --> https://www.st.com/en/evaluation-tools/ ... sample-buy

The JC2's are available but unfortunately I can't find a distributor for a JC1 variant (which I need for Australian use). That STM32 page suggests Rutronik have them...but JC1's aren't listed there.

If anyone can find a Nucleo-WL55JC1 I'd be very keen to get my hands on one!