Arduino for STM32

Tha mov was the problem.. now the code compile. Not working but i will reach a solution.
It supposes to do the same thing of the C code: serialize SCL and use it to set/reset to pin 5 of GPIOA.
This generate the scancode of the char to show it on the screen.
I just need a code faster than C to ...

Thank you for the fast reply.

The full code was attached to the first post. You can find it here: https://185.94.88.6/pannello/stm32_video_asm.zip

VideoUp and Videodown are simply this:

#define videoUp GPIOA -> BSRR = (1 << 5);
#define videoDown GPIOA -> BRR = (1 << 5);

I corrected the "ldr ...

I have built a tinycomputer based on bluepill with arduino ide.
The main board has connection for video, audio, memory card, serial ram, commodore joystick and paddles.
My first purpose is to obtain an 80x25 textual video terminal and then to add tinybasic.
Actually, with C code, i have a screen ...