GD32F130C8T6

[tonvanhieu]

My sideboard chipset is GD32F130C8T6 different from yours (C6T6). I have flashed your firm ware to my chip success but it can't read MPU data. Do you know what i have to do to make project is suitable with C8T6 chip

[EFeru]

Looking at the memory map GD32F130C8T6 vs STM32F103C8T6 there are similarities but also differences. So, I don't think the hoverboard-sideboard-hack-STM version would match.

I think you need to download the GD32F1x0_Firmware_Library_V3.1.0 from here:
https://gd32mcu.21ic.com/documents
search for GD32F1x0 and download the files. Then replace the library.

In quick words these should be the steps. Let me know about the progress.

[EFeru]

oh, I just noticed is the same GD library, the C8T6 has only more memory (Flash: 64K, Ram: 8K ) than the C6T6 (Flash: 32K, Ram: 4K).
After flashing, does the LEDs blink?

Edit: Can you check the connection of I2C_SDA and I2C_SCL pins from MPU6050 towards the GD32? Which pins of the GD32 are used for that?

[tonvanhieu]

I'm checking it.
I just change device from device list and the "Programming Algorithm" then I can flash it normally. But i have problem with debugging by Keil 5. Variables that i add to WATCH window don't change, it's always ZERO.
Yes, the center LEDs blink.
I have checked I2C, it's same as yours ( I2C_0, PB6 and PB7). Because i can't debug so i don't know if it can read or not ( i will check it by USART later).

[EFeru]

That is a good sign! And do you get Green LED after the blink? That is an indication the MPU6050 is working fine.
Edit: For debugging and playing with the board a bit you need one of this. I heard someone did it with an ESP32, maybe an Arduino also works... basically you need a Serial Communication, but this you know :)

[tonvanhieu]

I will check it later ( i have to go to school now).
By the way my MPU is 6052, is it same with 6050?

Reply edit: yeah i know about that, in my case i use my USART-Bluetooth module (HC-05 - from my old project 😄 ).

[EFeru]

MPU6052 is probably a newer variant, theoretically it should work, practically I didn't check because I don't have it.

[tonvanhieu]

BIG PROBLEM WITH DELAY FUNCTION.
It's always stuck when meet delay(>400). I don't know why. When i delete introDemoLED(100); it configuring MPU non-stop.

Edit: Do i need power the board by 15V to enable MPU???

[EFeru]

You need to power the board with at least 12V. I noticed similar funny behavior when I was powering the board with 7.5V from an external source.
So, yes, either use the an external source with 12V or use the mainboard power.

[tonvanhieu]

delay_ms(); make program be stuck. How to fix it :((. i feel so impotent.
I have tried power it by mainboard but nothing change.
Sensors work well but mpu not yet.

[tonvanhieu]

It's all about delay function. when i change delay time in mpu_init() below 10 the board can go 1 more step (writing DMP). So, if i can find out what happen to delay_ms() i can solve that. But i still can't :((. Delay_ms() kill me.

[EFeru]

How did you unlock your GD32 chip?

I had similar behavior with one board. To fix it I did the following (please try):

• Lock back the GD32 with ST Link Utility
• Unlock the GD32 as described here
• At Step 6, check all the boxes for "User configuration option bytes"
• Flash and try

[tonvanhieu]

I follow you at step 6 and this box appear

Any wrong with it?
EDIT: OH MY GODDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD.
It WORKS. OMG. YOU ARE GOD.
Let me call you teacher from now. You teach me so much.

[EFeru]

Hahaha...:) Good that it works. The error is no issue.
Yeah.. sometimes the unlocking is not done properly and you get funny behavior.

EDIT: I will put this as a side note in the unlocking process. If someone else has the same issue.