Error while compiling and upload on STM32 Bluepill

[Suresh6060]

I tried to upload the example code of DMD_STM32 HUB12 monochrome using arduino ide and st-link.

I am getting the following error

c:/users/user/appdata/local/arduino15/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/../lib/gcc/arm-none-eabi/4.8.3/../../../../arm-none-eabi/bin/ld.exe: C:\Users\user\AppData\Local\Temp\arduino_build_23202/stm32_dmd32.ino.elf section .data' will not fit in region rom'
c:/users/user/appdata/local/arduino15/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/../lib/gcc/arm-none-eabi/4.8.3/../../../../arm-none-eabi/bin/ld.exe: region `rom' overflowed by 8388 bytes
collect2.exe: error: ld returned 1 exit status

before uploading this sketch, I uploaded a simple onboard led blink sketch and it worked fine. So the setup seems to be fine.

Overflowing means the code is larger than the capacity of the microcontroller ? but how ? or is it any other issue ?

[board707]

section .data' will not fit in region rom'

It's means that the code size exceed of the flash memory of the controller.
What the board do you selected in the Arduino IDE?
What the IDE outputs about the code and variables size after compilation?

[Suresh6060]

"Generic STM32F103C6/fake STM32F103C8"

[board707]

Do you really have a STM32F103C6 (not a C8 ) board?
In that case you need to use a special procedure to compile the code, because this board has only a half as memory as a standard "bluepill" .
And in any case I would not recommend to use the "c6" variant, because you will only able to run a quite basic examples on it.

[Suresh6060]

I changed the board to "Generic STM32F103C series" and it compiled and uploaded.

However only 3 LED's are lit constantly. Don't know if I have wired it wrong. Let me check.

[Suresh6060]

Chip on board is c8

[Suresh6060]

I am having a strange issue.

After changing the Board to "generic STM32F1 series" , it uploaded and started working.

However. When powered by Computer USB, the program starts with scrolling etc. Though the main letters are scrolling, practically all other LED's are half lit except the top 3 on the right most column

When the board is powered by external 5v supply, the scrolling stops midway with a few leds lit and all the rest are unlit.
Scrolling stops.

What could be this problem ?. Powersupply is good because I use it for ESP32 also. This supply is connected to the 5v pin of the Bluepill.

[Suresh6060]

It started working nicely after changing the PA15 to PA0 .