Differences

This shows you the differences between two versions of the page.

--- digic8:registers [2022/02/20 12:15] – [LV peaking (Highlights / zebra)] kitor
+++ digic8:registers [2022/02/21 23:03] (current) – [LV peaking (Highlights / zebra)] kitor
@@ Line 26: / Line 26: @@
 ==== LV peaking (Highlights / zebra) ====
-^ Address        ^ Description                           ^
+^ Address        ^ Output  ^ Type      ^ Controls what?      ^
-| ''0xD0304220'' | LCD/EVF highlight enable register     |
+| ''0xD0300520'' | HDMI    | zebra     | enable / disable    |
-| ''0xD0304488'' | LCD/EVF highlight threshold register  |
+| ''0xD0300750'' | HDMI    | overexpo  | threshold and style |
-| ''0xD030448C'' | LCD/EVF highlight color register      |
+| ''0xD0300754'' | HDMI    | overexpo  | color               |
-| ''0xD0300520'' | HDMI highlight enable register        |
+| ''0xD0300758'' | HDMI    | underexpo | threshold and style |
-| ''0xD0300750'' | HDMI highlight threshold register     |
+| ''0xD030075C'' | HDMI    | underexpo | color               |
-| ''0xD0300754'' | HDMI highlight color register         |
+| ''0xD0304220'' | LCD/EVF | zebra     | enable / disable    |
+| ''0xD0304488'' | LCD/EVF | overexpo  | threshold and style |
+| ''0xD030448C'' | LCD/EVF | overexpo  | color               |
+| ''0xD0304490'' | LCD/EVF | underexpo | threshold and style |
+| ''0xD0304494'' | LCD/EVF | underexpo | color               |
 Registers used by ''DispVram'' State object to control overexposure highlighting feature.
-Not tested on HDMI yet (registers found via static analysis). Ability to have underexposure highlights (like on D45) is not yet confirmed.
+Different addresses and slightly different values than Digic 6/7, but capabilities are very similar.
+__It is possible to have independent zebras configured on LCD and HDMI while running in Clean HDMI mode!__
+===Note on directly writing the registers===
+Directly writing some registers doesn't work (values are overridden). On R170.739 that happens for HDMI enable register, but this seems to differ from model to model. See [[digic6:registers|DIGIC 6 Register Map:]] for more info.
+TL;DR is that you need to find (via xrefs / static code analysis) where reg value is stored, and update that memory address instead.
 ===Enable register===
@@ Line 42: / Line 53: @@
 ''reg & 0x100'' controls if highlight is enabled or not.
-Value written should be masked with one read from ''reg + 0x2000''
+Value written should be masked ''0x100'' with one read from ''reg + 0x2000''
-===Threshold register===
+This register lies in **Display registers** range and most likely has more meanings.
+===Threshold / style register===
 <code>
@@ Line 53: / Line 66: @@
 .... .... ..** .... .... .... .... .... stripes style
 .... .... .... .*** .... .... .... .... stripes opacity
-.... .... .... .... **** **** .... .... unknown
+.... .... .... .... **** **** .... .... threshold (underexpo)
-.... .... .... .... .... .... **** **** threshold
+.... .... .... .... .... .... **** **** threshold (overexpo)
 </code>
-Value written should be masked 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                  |
-| angle      | 0-1   | 0: 45 deg, 1: -45 deg                                   |
+| angle        | 0-1   | 0: 45 deg, 1: -45 deg                                   |
-| style:     | 0-2   | 0: light dots, 1: thin lines, 2: thick lines            |
+| style        | 0-2   | 0: light dots, 1: thin lines, 2: thick lines            |
-| opacity    | 0-7   | very opaque -> solid color                              |
+| opacity      | 0-7   | very opaque -> solid color                              |
-| unknown    | 0-255 | Unknown, allowed by code but always overwritten with 00 |
+| underexpo_th | 0-255 | Threshold on undexexpo register, ignored on overexpo    |
-| threshold  | 0-255 | Threshold above which zebra will be overlaid            |
+| 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===
 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 ====