I2C Registers: Difference between revisions

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@@ Line 227: / Line 227: @@
 == Device 3 ==
+  ro = read-only (writing is no-op)
+  rw = read-write
+  wo = write-only (reading will yield 00, FF, or unpredictable data)
+  s* = shared register (explaination below this table)
+  *v = volatile (survives reboots)
 {| class="wikitable" border="1"
 !  REGISTER
@@ Line 319: / Line 324: @@
 | 0x15
 | s
-| rw
+| rw v
-| ? (volatile;survives reboot and power off)
+| ?
 |-
 | 0x16
 | s
-| rw
+| rw v
-| ? (volatile;survives reboot and power off)
+| ?
 |-
 | 0x17
 | s
-| rw
+| rw v
-| ? (volatile;survives reboot and power off)
+| ?
 |-
 | 0x18
@@ Line 365: / Line 370: @@
 | 0x1C
 | s
-| rw
+| rw v
-| ? (volatile;survives reboot and power off)
+| ?
 |-
 | 0x1D
 | s
-| rw
+| rw v
-| ? (volatile;survives reboot and power off)
+| ?
 |-
 | 0x1E
 | s
-| rw
+| rw v
-| ? (volatile;survives reboot and power off)
+| ?
 |-
 | 0x1F
 | s
-| rw
+| rw v
-| ? (volatile;survives reboot and power off)
+| ?
 |-
 | 0x20
@@ Line 407: / Line 412: @@
    bit2: bottom screen backlight off
    bit3: bottom screen backlight on
-   bit4: top screen backlight off (does nothing on 2DS as the backlight is bottom only)
+   bit4: top screen backlight off
-   bit5: top screen backlight on (see above)
+   bit5: top screen backlight on
+bits 4 and 5 have no effect on a 2DS because the backlight source is the bottom screen
 |-
 | 0x23
@@ Line 448: / Line 455: @@
 | s
 | rw
-| WiFi LED state, non-0 value turns on the WiFi LED, capped at 0x0F
+| WiFi LED state, non-0 value turns on the WiFi LED, 4 bits wide
 |-
 | 0x2B
@@ Line 458: / Line 465: @@
 | s
 | rw
-| 3D LED state, capped at 0x0F
+| 3D LED state, 4 bits wide
 |-
 | 0x2D
@@ Line 483: / Line 490: @@
    byte 1: minutes
    byte 2: hours
-   byte 3: current day of the week (unused)
+   byte 3: current week (unused)
    byte 4: days
    byte 5: months
    byte 6: years
-   byte 7: leap year counter (unused)
+   byte 7: leap year counter / "watch error correction" register (unused)
 |-
 | 0x38
-- 0x3C
+- 0x3A
 | s
 | rw
 | RTC alarm registers
-Register 0x3B could be used to upload [[MCU_Services#MCU_firmware_versions|MCU firmware]] if some conditions are met.
+  byte 0: minutes
+  byte 1: hours
+  byte 2: week
+|-
+| 0x3B
+- 0x3D
+| s
+| rw
+| Register 0x3B could be used to upload [[MCU_Services#MCU_firmware_versions|MCU firmware]] if some conditions are met.
 |-
 | 0x3D
@@ Line 505: / Line 520: @@
 | s
 | wo
-| Peripheral power related? bit0 seems to depower everything, pressing the power key afterwards instantly turns the whole 3DS off
+| Register-mapped MCU RESET?
 |-
 | 0x40
@@ Line 533: / Line 548: @@
 |-
 | 0x45
+- 0x4A
 | s
-| rw
+| ro
-| ?
+| Gyroscope 3D rotation from the 12bit ADC, left shifted 4 to fit in a 16bit signed short
+{| class="wikitable" border="1"
+!  AXIS
+!  V=0x00
+!  V=0x40
+!  V=0xC0
 |-
-| 0x46
+| Y (=roll)
-| s
+| held vertically
-| ro
+| vertical right side
-| Gyro Y(?) axis rotation (0x00 = flat, 0x40 = 3DS standing on right side, 0xBE = 3DS standing on left side)
+| vertical left side
 |-
-| 0x48
+| Z? (=yaw)
-| s
+| ???
-| ro
+| ???
-| Gyro Z(?) axis rotation (0x00 = flat, 0x40 = 3DS standing horizontally, 0xBE = 3DS base is horizontally upside-down)
+| ???
 |-
-| 0x4A
+| X? (=pitch)
-| s
+| held vertically
-| ro
+| ???
-| Gyro X(?) axis rotation (0x00 = 3DS base facing upwards, 0x40 = face-down flat, 0xBE = standing(?) flat)
+| ???
+|}
 |-
 | 0x4B
@@ Line 596: / Line 618: @@
 | s
 | rw
-| DSP volume slider 0% volume offset (setting this to 0xFF will esentially mute the DSP as it's the volume slider's maximum raw value)
+| Register-mapped ADC register
+DSP volume slider 0% volume offset (setting this to 0xFF will esentially mute the DSP as it's the volume slider's maximum raw value)
 |-
 | 0x59
 | s
 | rw
-| DSP volume slider 100% volume offset (setting both this and the above to 0 will disable the volume slider with 100% volume, setting this to a lower value than the above will make the volume slider have only 2 states; on and off)
+| Register-mapped ADC register
+DSP volume slider 100% volume offset (setting both this and the above to 0 will disable the volume slider with 100% volume, setting this to a lower value than the above will make the volume slider have only 2 states; on and off)
 |-
 | 0x5A