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base repository: GLGPrograms/tinyDiskII
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base: master
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head repository: GLGPrograms/tinyDiskII
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compare: rev2.0
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  • 7 commits
  • 10 files changed
  • 1 contributor

Commits on Jul 21, 2024

  1. [sdcard] first steps toward rev 2.0 

    - swapped SDCARD_CLK and SDCARD_DO pins to make use of syncronous UART
  (MSPI mode).
- Switched from SPI to UART, MSPI mode.
    @giuliof
    giuliof committed Jul 21, 2024
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  2. [repo] Note in readme

    @giuliof
    giuliof committed Jul 21, 2024
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  3. [dma] first working code with DMA, only read is implemented 

    ALERT: AN HARDWARE CHANGE IS NEEDED, THIS CODE IS COMPATIBLE ONLY WITH
HARDWARE REV2.0.

- disabled writing, since is currently not implemented through DMA;
- removed bitbanging, no more needed;
- sdcard SPI is handled with USART in MSPI mode, this need pin swap
  between MOSI and SCK;
- spi speed is incremented to 16MHz. Initialization speed is fixed to
  50kHz;
- added DMA for floppy sector reading.
    @giuliof
    giuliof committed Jul 21, 2024
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  4. [dma] read/write code with DMA implemented, now with formatting support 

    Tested with AppleDOS INITIALIZE command and CopyII+ V5.

- Writing buffer size increased to keep whole SD Card sector, plus CRC
  and "end of data token". Buffer is mostly initialized at startup, only
  address and data fields are changed at runtime.
- New writing state machine, which detects the currently writing field
  and updates the writing buffer accordingly.
- Buffer commit is always triggered at the end of a data field. Another
  write request can now be interleaved while buffer commit is in progress.
- When formatting operation is detected (i.e. an address field is
  written), reading is inhibited.
    @giuliof
    giuliof committed Jul 21, 2024
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  5. [floppy] fast workaround for a bit slip issue

    @giuliof
    giuliof committed Jul 21, 2024
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  6. Minor, indentation

    @giuliof
    giuliof committed Jul 21, 2024
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  7. [floppy] get current volume when changing sector's content

    @giuliof
    giuliof committed Jul 21, 2024
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