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Low Power Examples for STM32WLEx family

examples/stm32wle5-lp/README.md

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Low Power Examples for STM32WLEx family

Examples in this repo should work with LoRa-E5 Dev Board board.

Prerequsits

  • Connect a usb serial adapter to LPUart1 (this is where ALL logging will go)
  • Optional: Connect an amp meter that ran measure down to 0.1uA to the power test pins
  • cargo install defmt-print so you can print log messahes from LPUart1

Example Notes

All examples will set all pins to analog mode before configuring pins for the example, if any. This saves about 500uA!!!!

  • the adc example will sleep in STOP1 betwen samples and the chip will only draw about 13uA while sleeping
  • the blinky example will sleep in STOP2 and the chip will only draw 1uA or less while sleeping
  • the button_exti example will sleep in STOP2 and the chip will only draw 1uA or less while sleeping
  • the i2c examples will sleep in STOP1 between reads and the chip only draw about 10uA while sleeping

For each example you will need to start defmt-print with the example binary and the correct serial port in a seperate terminal. Example:

defmt-print -w -v -e target/thumbv7em-none-eabi/debug/<module-name> serial --path /dev/cu.usbserial-00000000 --baud 115200

Run individual examples with

cargo flash --chip STM32WLE5JCIx --connect-under-reset --bin <module-name>

for example

cargo flash --chip STM32WLE5JCIx --connect-under-reset --bin blinky

You can also run them with with run. However in this case expect probe-rs to be disconnected as soon as flashing is done as all IO pins are set to analog input!

cargo run --bin blinky

Checklist before running examples

You might need to adjust .cargo/config.toml, Cargo.toml and possibly update pin numbers or peripherals to match the specific MCU or board you are using.

  • Update .cargo/config.toml with the correct probe-rs command to use your specific MCU. For example for L432KCU6 it should be probe-rs run --chip STM32L432KCUx. (use probe-rs chip list to find your chip)
  • Update Cargo.toml to have the correct embassy-stm32 feature. For example for L432KCU6 it should be stm32l432kc. Look in the Cargo.toml file of the embassy-stm32 project to find the correct feature flag for your chip.
  • If your board has a special clock or power configuration, make sure that it is set up appropriately.
  • If your board has different pin mapping, update any pin numbers or peripherals in the given example code to match your schematic

If you are unsure, please drop by the Embassy Matrix chat for support, and let us know:

  • Which example you are trying to run
  • Which chip and board you are using

Embassy Chat: https://matrix.to/#/#embassy-rs:matrix.org