kernelcrash / spectravideo-floppy-emulator Goto Github PK

Hi, not sure if your still actively working on this project but here goes...
I built the project EXACTLY as per your configuration (board type, wiring, code etc) but have not had any luck getting a successful result after a week of debugging.... :-(

I get absolute no response from the SVI-328 as to detecting a disk image.

So I've added temporary UART debug code to see what is going on....

• Program loads into 'main'.
• Selects first disk image (tried multiple images and tested all disk image in different SVI emulators on the PC) .
• LED D2 shows a solid green.
• Tested without an SD card - LED D2 flashes an error code as expected. UART debugging reports missing SD card
• I can select different images on the SD card with the 'NEXT' button - UART debugging reports the new (full) file name and the image density size (single or double)
• If the SVI computer is turned on, I CANNOT change disk image. The 'NEXT' button won't respond though STM32cubeIDE debugging suggests 'main' is working and code stepping through 'main' still works.

I've also tried to debug the process as the SVI-328 boots to 'diskBASIC'. I get the following results...

1. 'fdc_sector_write' (line 1189, interrupt.S) gets called but stays in an infinite loop UNLESS i comment out the 'iorq_databus_write_delay' call.
2. next 'fdc_sector_read'(line 624, interrupt.S) gets called - seems okay
3. then 'fdc_sector_write'(line 1292,interrupt.S) is called but again will not exit UNLESS i comment out the 'iorq_databus_write_delay' again.
4. code operation returns to 'main' while() loop.
5. SVI shows no indication of a disk or the ability to access the disk...

So, I guess I'm running out of ideas as I think I'm missing information on how the process is supposed to work. And maybe my lack of STM32 knowledge.
What should the order of operation be when the SVI boots? I imagined writing to the FD1793 register then reading it back to test if a FDC is connected....???
I'm not sure if I have a timing issue or hardware with the results I get...?
I can't get it out of my head that the /WR line is not used/connected... I assumed it mandatory for register and disk writes.
I've looked at the other Floppy emulators you've created (MSX, Electron, Dragon etc) for something I've missed but who knows...
But I now see where the code references to a PS2 keyboard and ROM images came from... cut and paste huh.. :-)

Any feedback would be appreciated.
Thanks.