Information about and reprogramming the GD32 processor on UNIHIKER
Ste7an 2023-10-21 16:12:10 318 Views2 Replies I have a few questions related to the UART using PinPong library:
- is it possible to use one of the 4-pin i2c ports as a UART; I only seem to be able to configure a UART on the extension connector
- Is it possible to reprogram the GD32 by myself? In that way, I could implement a low level Lego compatible protocol? See https://uartremote.readthedocs.io/en/latest/arduinouartremote.html
- Would it be possible to share the Firmata Unihiker source code that generates the binary file:/usr/local/lib/python3.7/dist-packages/pinpong/base/FirmataExpress.UNIHIKER.3.7.bin
- Are there any schematics available for the UNIHIKER, especially to see how the external pins are mapped to the GD32 MCU?
Thank you for the schematic. I do know how to program a GD32 (using Arduino or native STM32 C code). So, to reprogram the GD32 using an STM32 programmer, I can use the GD_SWIO and GD_SWCLK. But it seems that the UNIHIKER can also reprogram the GD32 from the Linux side by uploading the /FirmataExpress.UNIHIKER.3.7.bin firmware. Can you describe how that works?Furthermore, it would be helpful to publish the source code of the program that is currently running on the GD32. Then, I could use that as a starting point, and need not to program the IMU, Gravity and keys by myself again.
Ste7an 
This is the schematic of the pins.
And The i2c port on the unihiker cannot be used as a UART port. You can use P0 and P3 on the gold finger (https://www.unihiker.com/wiki/pinpong_python_lib#|-%206.1-Serial%20Port%EF%BC%88UART%EF%BC%89), or you can connect a USB to TTL module to the USB-A port on the unihiker to derive a UART port (https://community.dfrobot.com/makelog-313506.html).
Additionally, the source code for gd32 is written in C. If you understand how to program for gd32, you can try writing a new program.
Tonny12138 
