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digic8:registers [2022/02/20 14:53] – [LV peaking (Highlights / zebra)] kitordigic8:registers [2022/02/20 17:04] – [LV peaking (Highlights / zebra)] kitor
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 ^ Address        ^ Output  ^ Type      ^ Controls what?      ^ ^ Address        ^ Output  ^ Type      ^ Controls what?      ^
-| ''0xD0300520'' | HDMI    | overexpo  | enable / disable    | +| ''0xD0300520'' | HDMI    | zebra     | enable / disable    |
-| ''0xD0300550'' | HDMI    | underexpo | enable / disable    |+
 | ''0xD0300750'' | HDMI    | overexpo  | threshold and style | | ''0xD0300750'' | HDMI    | overexpo  | threshold and style |
 | ''0xD0300754'' | HDMI    | overexpo  | color               | | ''0xD0300754'' | HDMI    | overexpo  | color               |
 | ''0xD0300758'' | HDMI    | underexpo | threshold and style | | ''0xD0300758'' | HDMI    | underexpo | threshold and style |
 | ''0xD030075C'' | HDMI    | underexpo | color               | | ''0xD030075C'' | HDMI    | underexpo | color               |
-| ''0xD0304220'' | LCD/EVF | overexpo  | enable / disable    | +| ''0xD0304220'' | LCD/EVF | zebra     | enable / disable    |
-| ''0xD0304250'' | LCD/EVF | underexpo | enable / disable    |+
 | ''0xD0304488'' | LCD/EVF | overexpo  | threshold and style | | ''0xD0304488'' | LCD/EVF | overexpo  | threshold and style |
 | ''0xD030448C'' | LCD/EVF | overexpo  | color               | | ''0xD030448C'' | LCD/EVF | overexpo  | color               |
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 Registers used by ''DispVram'' State object to control overexposure highlighting feature. Registers used by ''DispVram'' State object to control overexposure highlighting feature.
  
-HDMI registers don't work as for now. Threshold/color registers accepts values as expected. Enable/disable is ignored.+===Note on HDMI registers=== 
 +Directly poking HDMI enable doesn't work. There's something running in DryOS that constantly overwrites this register with value saved in runtime.
  
-When observed in Play menu (with stock overexpo warning enabled), enable register changes as expected. So there's a piece of puzzle still missing.+On R180.739 I was able to follow xrefs to that register, and found a function that writes them - on R180.739 source value is stored in ''b054''. If you apply the rules but write value to ''b054'' instead of register - it will get updated and zebras displayed on HDMI.
  
-Code suggests there are more registers: +__It is possible to have independent zebras configured on LCD and HDMI while running in Clean HDMI mode!__
- +
-^ Output  ^ Reg       ^ Addresses                 ^ Range   ^ +
-| HDMI(?) | Enable    | ''0xD0300520 + 0x30 * n'' | n∈⟨0,7⟩ | +
-| HDMI(?) | Threshold | ''0xD0300750 + 0x8  * n'' | n∈⟨0,5⟩ | +
-| HDMI(?) | Color     | ''0xD0300754 + 0x8  * n'' | n∈⟨0,5⟩ | +
-| LCD(?)  | Enable    | ''0xD0304220 + 0x30 * n'' | n∈⟨0,7⟩ | +
-| LCD(?)  | Threshold | ''0xD0304488 + 0x8  * n'' | n∈⟨0,5⟩ | +
-| LCD(?)  | Color     | ''0xD030448C + 0x8  * n'' | n∈⟨0,5⟩ | +
- +
-For ''n > 1'' there's no visible difference. +
- +
-For ''n > 1'' Threshold registers accept both thresholds at the same time, but since those have no observed effects on displayed image - meaning is unknown.+
  
 ===Enable register=== ===Enable register===
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 Value written should be masked ''0x100'' with one read from ''reg + 0x2000'' Value written should be masked ''0x100'' with one read from ''reg + 0x2000''
 +
 +This register lies in **Display registers** range and most likely has more meanings.
  
 ===Threshold / style register=== ===Threshold / style register===
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 Value written should be masked ''0xB137FFFF'' with one read from ''reg + 0x2000'' Value written should be masked ''0xB137FFFF'' with one read from ''reg + 0x2000''
  
-^ Field      ^ Range ^ Description ^+^ Field        ^ Range ^ Description ^
 | visibility   | 0,1   | zebra visibility (do not confuse with Enable register)  | | visibility   | 0,1   | zebra visibility (do not confuse with Enable register)  |
 | speed        | 0-3   | lines/dots are moving slower -> faster                  | | speed        | 0-3   | lines/dots are moving slower -> faster                  |
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 | underexpo_th | 0-255 | Threshold on undexexpo register, ignored on overexpo    |  | underexpo_th | 0-255 | Threshold on undexexpo register, ignored on overexpo    | 
 | overexpo_th  | 0-255 | Threshold on overexpo register, ignored on underexpo    | | overexpo_th  | 0-255 | Threshold on overexpo register, ignored on underexpo    |
 +
 +**Note: On HDMI max threshold is 0xE8** Values above that are not displayed!
  
 ===Color register=== ===Color register===
  
 Controls color of highlight overlays. ''??YYUUVV'' format. Canon code defaults to black (''00008080'') Controls color of highlight overlays. ''??YYUUVV'' format. Canon code defaults to black (''00008080'')
 +
 +===More registers===
 +
 +Code suggests there are more registers:
 +
 +^ Output ^ Reg       ^ Addresses                 ^ Range   ^
 +| HDMI   | Enable    | ''0xD0300520 + 0x30 * n'' | n∈⟨0,7⟩ |
 +| LCD    | Enable    | ''0xD0304220 + 0x30 * n'' | n∈⟨0,7⟩ |
 +| HDMI   | Threshold | ''0xD0300750 + 0x8  * m'' | m∈⟨0,5⟩ |
 +| HDMI   | Color     | ''0xD0300754 + 0x8  * m'' | m∈⟨0,5⟩ |
 +| LCD    | Threshold | ''0xD0304488 + 0x8  * m'' | m∈⟨0,5⟩ |
 +| LCD    | Color     | ''0xD030448C + 0x8  * m'' | m∈⟨0,5⟩ |
 +
 +n values above 0 and m values above 1 are not understood. There's no visible difference on screen.
 +
 +For ''m > 1'' Threshold registers accept both under and overexposure thresholds at the same time, but since those have no visible effects on displayed image - meaning is unknown.
 +
 +Guess: maybe ''m > 1'' are in use for 10 bit / HDR mode?
 ==== Audio ==== ==== Audio ====
  
digic8/registers.txt · Last modified: 2022/02/21 23:03 by kitor