This is a MicroPython board definition file for the G30TH from ghielectronics.

The quick version follows, and a more complete blog post can be found here: http://blog.davehylands.com/2016/07/bringing-up-micropython-on-ghi.html

The G30TH is the replacement for the G30HDR. The product page can be found here: https://www.ghielectronics.com/catalog/product/551

Build the firmware using:

cd micropython/stmhal/boards
git clone https://github.com/dhylands/G30TH.git
cd ..
make BOARD=G30TH

Note that you need to power the G30TH board by providing 3.3v to the 3V3 pin. There is no onboard regulator. The 5V power line from the USB (called VUSB) is exposed as V+ and can be used to power an external regulator.

To get the device in DFU mode, you need to connect B0, which is the test point located on the bottom right corner of the board (same side and opposite end to the USB connector), to 3.3v, while powering up or RESETing the device.

Once in DFU mode, you should be able to use the dfu-util --list command and see something like this:

Found DFU: [0483:df11] ver=2200, devnum=14, cfg=1, intf=0, alt=3, name="@Device Feature/0xFFFF0000/01*004 e", serial="377A364D3234"
Found DFU: [0483:df11] ver=2200, devnum=14, cfg=1, intf=0, alt=2, name="@OTP Memory /0x1FFF7800/01*512 e,01*016 e", serial="377A364D3234"
Found DFU: [0483:df11] ver=2200, devnum=14, cfg=1, intf=0, alt=1, name="@Option Bytes  /0x1FFFC000/01*016 e", serial="377A364D3234"
Found DFU: [0483:df11] ver=2200, devnum=14, cfg=1, intf=0, alt=0, name="@Internal Flash  /0x08000000/04*016Kg,01*064Kg,03*128Kg", serial="377A364D3234"

The G30TH is read protected. In order to flash MicroPython on it, you need to unprotect it, which will in turn erase the part. This is a one-time operation. Once MicroPython is flashed, the device will remain unprotected.

Unprotect/Erase the device using:

dfu-util -s :unprotect:force -a 0 -d 0483:df11 -D build-G30TH/firmware.dfu

Now you can flash MicroPython using:

make BOARD=G30TH deploy

Reboot with BOOT0 unconnected, and it should boot up MicroPython on the REPL:

USB Serial device with vendor 'MicroPython' serial '377A364D3234' connected @/dev/ttyACM0
Use Control-X to exit.
MicroPython v1.8.2-13-g08eac74 on 2016-07-14; G30TH with STM32F401CE
Type "help()" for more information.
>>> 

Now that MicroPython is installed, as long as you can get to the REPL, then you can get back into DFU mode by using the command:

>>> pyb.bootloader()

or by connecting B0 to 3.3v.