[Physical product verified] JLink OB_GD32F103RET6_Series 3

This hardware design is completely open source and can be used for personal use and not for commercial use . Please respect the spirit of open source hardware!

The software part comes from the Internet . If there is any infringement, please contact me to delete the software attachments.

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There are 4 issues in this series, and this is the 3rd one:

The address of the first issue: https://oshwhub.com/duyes/jlink-zui-xiao-ban

Address for the second phase: https://oshwhub.com/duyes/jlink-zui-xiao-wai-wei-ban

After using STM32F103RCT6 instead of STM32F103CBT6 to save money last time, I want to continue to save some money. I still have the GD32F103RET6 chip on hand. Why not try it too?

Anyway, GD chips are much cheaper than STM chips now!

I don’t need to type the V1.0 board. I can just use the RCT6 V1.0 board. They are all PIN 2 PIN anyway~

After the test, I found that after the old firmware was burned in, the computer could not recognize JLINK. After the new firmware was burned in, it was usable in the test, but the speed was still only 2.25M~

So since the old firmware cannot be used, you can actually remove a certain jumper of the LED light and re-make the board V2.0!

This board can be directly attached to the GD32F103RET6. There is no other way. GD is so cheap, so you don’t have to bear it! Cheap price is the first factor:)

The picture below is the actual welding diagram. You can weld according to the diagram. The crystal oscillator is Murata Ceramics 3213 8M capacitor. Because of its small size and built-in capacitor, I particularly like it!

JP is the output 3.3V short-contact point. Because the output part of this board is not fool-proof, it is easy to cause the target board to burn the MCU due to mis-insertion. So if Jlink does not carry 3.3V, this problem can be avoided to a large extent. If you don't want the output to have 3.3V, you don't need to short this.

The disadvantage of burning a new version of firmware is that the LED light does not light up at ordinary times. It will light up only when SWD is downloaded, but no warning window will pop up. The speed is on the low side, 2.25M. Fortunately, the GD32 board can be used.

The one above TYPEC is the JLINK programming port, and RST is only used when the chip is write-protected. The method is based on Baidu, so I won’t explain it in detail.

Finally, I will upload my own finished picture. If you don’t understand, please click and leave a message.

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