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LoRa - Hello World

This is my initial LoRa project. The goal is to program two LoRa devices with TinyGo and see if they can talk to each other.

Hello World Program

Initialize a go module and grab the source code.

go mod init mymod
curl -o lora_rxtx.go https://raw.githubusercontent.com/tinygo-org/drivers/release/examples/sx126x/lora_rxtx/lora_rxtx.go
curl -o radio.go https://raw.githubusercontent.com/tinygo-org/drivers/release/examples/sx126x/lora_rxtx/radio.go
curl -o radio_stm32wl.go https://raw.githubusercontent.com/tinygo-org/drivers/release/examples/sx126x/lora_rxtx/radio_stm32wl.go

Attach ST-Link V2

ST-LINK Pin LoRa-E5 Pin
2 - SWCLK SWCLK
4 - SWDIO SWDIO
6 - GND GND
8 - 3.3V VCC

wireup

Flashing

Programs are loaded onto the LoRa-E5 with an STLink hardware programmer, using the openocd command line utility program to perform the board flashing. You must install OpenOCD before you will be able to flash the LoRa-E5 board with your TinyGo code. If this is a new LoRa-E5 board you will need to perform a one time task to unlock your board as described below.

  • Install the openocd CLI on your workstation
  • Connect the ST-Link dongle to the LoRa-E5 board
  • Plug the ST-Link dongle into your workstation’s USB port
    • DO NOT plug in the LoRa-E5's USB cable at the same time
    • Press the Boot button on the LoRa-E5 board just before you plug it in. Keep it pressed for several seconds then let go
  • Unlock your LoRa-E5 board using an openocd command
  • Power cycle your LoRa-E5 by unplugging it from all power sources
  • Plug the ST-Link dongle into your workstation’s USB port
  • Build and flash your TinyGo program
  • Unplug your ST-Link dongle from your workstation's USB port
  • Plug in the LoRa-E5's USB cable to your workstation’s to view your program's log messages

The detaild commands for this process is described below.

# Install openocd
brew install openocd

# Connect components: LoRa-E5 <---> ST-LINK <---> Workstation
# Press Boot button just before you apply power, hold for a few seconds 
# Unlock your LoRa-E5 board by sending the openocd command below
# If it has trouble connecting try sending the openocd command what still holding the boot button 
openocd -f /usr/local/Cellar/open-ocd/0.12.0/share/openocd/scripts/interface/stlink.cfg  \
        -f /usr/local/Cellar/open-ocd/0.12.0/share/openocd/scripts/target/stm32wlx.cfg \
        -c init \
        -c "reset halt" \
        -c "stm32wlx unlock 0" \
        -c "reset run" \
        -c shutdown

# Power cycle your your LoRa-E5 board then...
# Connect components: LoRa-E5 <---> ST-LINK <---> Workstation
# Build and flash your TinyGo program 
tinygo flash -target=lorae5

# Run and debug your app
# Connect components: LoRa-E5 <---usb---> Workstation

TinyGo Reference