Differences

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--- digic8:registers [2022/02/20 11:42] – 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.
-__Enable register__
+__It is possible to have independent zebras configured on LCD and HDMI while running in Clean HDMI mode!__
-''reg & 0x100'' controls if highlight is enabled or not. Value written should be masked with one read from ''reg + 0x2000''
+===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.
-__Threshold register__
+TL;DR is that you need to find (via xrefs / static code analysis) where reg value is stored, and update that memory address instead.
-''AABB??DD'', where:
+===Enable register===
-  * AA: ''0x80'' enables visibility
-  * BB: range ''0x0 - 0x7'' controls pattern (from light dots to solid color)
-  * DD: Highlights threshold
-__Color register__
+''reg & 0x100'' controls if highlight is enabled or not.
+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===
+<code>
+**** **** **** **** **** **** **** ****
+*... .... .... .... .... .... .... .... visibility (on/off)
+..** .... .... .... .... .... .... .... stripes move speed (0-3)
+.... ...* .... .... .... .... .... .... stripes angle (45 / -45 deg)
+.... .... ..** .... .... .... .... .... stripes style
+.... .... .... .*** .... .... .... .... stripes opacity
+.... .... .... .... **** **** .... .... threshold (underexpo)
+.... .... .... .... .... .... **** **** threshold (overexpo)
+</code>
+Value written should be masked ''0xB137FFFF'' with one read from ''reg + 0x2000''
+^ Field        ^ Range ^ Description ^
+| visibility   | 0,1   | zebra visibility (do not confuse with Enable register)  |
+| speed        | 0-3   | lines/dots are moving slower -> faster                  |
+| angle        | 0-1   | 0: 45 deg, 1: -45 deg                                   |
+| style        | 0-2   | 0: light dots, 1: thin lines, 2: thick lines            |
+| opacity      | 0-7   | very opaque -> solid color                              |
+| underexpo_th | 0-255 | Threshold on undexexpo register, ignored on overexpo    |
+| 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 ====