SceOled

Module

Known NIDs

Version	Name	World	Privilege	NID
1.69	SceOled	Non-secure	Kernel	0x5410837A

Libraries

Known NIDs

Version	Name	World	Visibility	NID
1.69	SceOledForDriver	Non-secure	Kernel	0x60C7478A

Resources

TODO: move to OLED.

• AMS495QA01 Datasheet: File:AMS495QA01 datasheet.pdf
• Baremetal OLED usage: https://github.com/xerpi/vita-baremetal-sample/blob/master/src/oled.c
• Linux driver of a similar screen: http://elixir.free-electrons.com/linux/latest/source/drivers/gpu/drm/panel/panel-samsung-ld9040.c#L37
• Some interesting paper explaining how the gamma lookup table is generated: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1343918
• DCS documentation: https://www.tonylabs.com/wp-content/uploads/MIPI_DCS_specification_v1.02.00.pdf

Types

enum SceOledError {
    SCE_OLED_ERROR_INVALID_BRIGHTNESS_VALUE = 0x803F0A02,
    SCE_OLED_ERROR_INVALID_READY_STATUS = 0x803F0A03,
    SCE_OLED_ERROR_NOT_READY = 0x803F0A04,
    SCE_OLED_ERROR_INTERNAL = 0x803F0A05
};

enum SceOledStatus {
    SCE_OLED_STATUS_NOT_READY = 0,
    SCE_OLED_STATUS_READY = 1,
    SCE_OLED_STATUS_ERROR = 2
};

struct SceOledCmd {
    unsigned char cmd,
    unsigned char size,
    unsigned char buf[size]
}

A cmd_queue is a contiguous array of SceOledCmd of different sizes. To get the next SceOledCmd of a queue, do:

struct SceOledCmd *cur_cmd = ...
struct SceOledCmd *next_cmd = &(cur_cmd->buf) + cur_cmd->size;

if (next_cmd->cmd == 0 || next_cmd->cmd == 255) {...} // End of queue

Available commands

Cmd	Size	Buf	Description
178	1	Unknown	Unknown
249	1 or 22	Unknown, for example <0x01, 0xCFBE9F9F, 0xCBC2C9D7, 0xDEE3E1BB, 0xFAD3D0D6, 0x002FE6ED, 0x2F> (Little-Endian)	Change Brightness

SceOledForDriver

ksceOledWaitReady

Version	NID
3.60	0x0CC6BCB4

int ksceOledWaitReady();

Waits until the OLED has been initialized.

ksceOledForDriver_2F0C4B67

Version	NID
3.60	0x2F0C4B67

int ksceOledForDriver_2F0C4B67(u8 cmd, void *buffer, int size);

Sends a command to the OLED.

ksceOledGetBrightness

Version	NID
3.60	0x43EF811A

int ksceOledGetBrightness();

Get the wide brightness value (0-65536).

ksceOledDisplayOn

Version	NID
3.60	0x4C7836C7

int ksceOledDisplayOn();

ksceOledDisplayOff

Version	NID
3.60	0xBC84602E

int ksceOledDisplayOff();

ksceOledSetDisplayColorSpaceMode

Version	NID
3.60	0xDABBD9D3

int ksceOledSetDisplayColorSpaceMode(int mode);

ksceOledForDriver_E30604CC

Version	NID
3.60	0xE30604CC

Dispatches the OLED cmd list (using ksceOledForDriver_2F0C4B67).

ksceOledSetBrightness

Version	NID
3.60	0xF9624C47 (wrong nid?)

int ksceOledSetBrightness(unsigned int brightness);

Set the brightness (brightness needs to be in the range 0-65536). 0 means screen turned off, 1 means screen dimmed (like if you wait for a long time without touching your screen).

The brightness has actually 17 different values: 1 special value for brightness=0, and 16 different values for the rest (real_value=brightness/4096).