HM-Sec-SCo-EFM32

Homebrew firmware for the HM-Sec-SCo, that can also be used with an Livisi WDSo2.0, HmIP-SWDO and HmIP-SWDO-I

• EFM32G200F64 Arduino IDE Integration
  • SPI communication with CC1101 module
  • get AlarmClock / Timer working
  • use internal EEPROM (emulated)
  • use external EEPROM (if M24M01 is mounted on pcb)
  • internal vcc measurement
  • external battery measurement
  • use address/serial from unique chip id
  • Sleep-Mode
• Unlock SWD interface
• Upload code with ST-Link V2 using OpenOCD

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HM-Sec-SCo PRG1 Pinout

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Software part

• 1.) Install Arduino IDE 1.8.5 or higher
• 2.) Add third party board support from https://raw.githubusercontent.com/jp112sdl/ARDUINO_EFM32/master/package/package_ARDUINO_EFM32_index.json
• 3.) Search for "efm32" and install the board
• 4.) Download AskSinPP dev_efm32 Branch (Code->Download ZIP) and extract it to the Arduino libraries directory

Hardware part

• 1.) Connect ST-LinkV2 to the PCB PRG1 pads using 4 wires (GND, 3.3V, SWCL, SWDIO)
• 2.) Unlock SWD access
  • start OpenOCD with openocd -f interface/stlink-dap.cfg -f target/efm32.cfg
  • connect to openocd using telnet localhost 4444
  • unlock with

efm32.dap apreg 0 0x4 0xcfacc118
efm32.dap apreg 0 0x0 1
efm32.dap apreg 0 0x8
sleep 1000
efm32.dap apreg 0 0x0 2
reset_config none
reset init

• 3.) for debugging it is helpful to connect a FTDI interface to the TX pin to read serial debug messages
• 4.) Upload code with /usr/local/bin/openocd -f interface/stlink-dap.cfg -f target/efm32.cfg -c "program /path/to/.elf verify reset exit"

⚠️ ST-Link V2 Firmware (Bug?)

After upgrading the firmware of my ST-Link V2 from V2J29S7 to V2J32S7 (or newer) it was no longer possible for me to unlock debug access!
I did not find the firmware V2J29S7 online, but it works with V2J28S6, too.
So I added this firmware update to the repository (stsw-link007-V2J28S6.zip).