disp_crtc_settings_t

CRT Controller settings

Synopsis:

#include <mode.h>

typedef struct disp_crtc_settings {
    short       xres;
    short       yres;
    short       refresh;
    unsigned    pixel_clock;

    uint8_t     sync_polarity;

    uint8_t     h_granularity;
    uint8_t     v_granularity;

    short       h_total;
    short       h_blank_start;
    short       h_blank_len;
    short       h_sync_start;
    short       h_sync_len;

    short       v_total;
    short       v_blank_start;
    short       v_blank_len;
    short       v_sync_start;
    short       v_sync_len;

    unsigned    flags;
} disp_crtc_settings_t;

Description:

The disp_crtc_settings_t structure contains the CRT Controller (CRTC) settings.

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These members are used in conjunction with generic modes only (with the refresh member applicable to both generic and fixed modes): h_granularity v_granularity pixel_clock sync_polarity h_total h_blank_start h_blank_len h_sync_start h_sync_len v_total v_blank_start v_blank_len v_sync_start v_sync_len For more information, see the get_modelist() function in the description of disp_modefuncs_t.

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The members include:

xres, yres

The horizontal and vertical resolution, in pixels.

refresh

The refresh rate (in Hz)

pixel_clock

The pixel clock rate (in kHz)

sync_polarity

Any combination of the following bits:

• DISP_SYNC_POLARITY_V_POS — vertical synchronization is indicated by a positive signal if this bit is on, else negative.
• DISP_SYNC_POLARITY_H_POS — horizontal synchronization is indicated by a positive signal if this bit is on, else negative.

Or, you can use the following manifest constants (composed of the bits from the above):

• DISP_SYNC_POLARITY_NN — both synchronization signals are negative.
• DISP_SYNC_POLARITY_NP — horizontal negative, vertical positive.
• DISP_SYNC_POLARITY_PN — horizontal positive, vertical negative.
• DISP_SYNC_POLARITY_PP — both synchronization signals are positive.

h_granularity, v_granularity

The horizontal and vertical granularity; the values of the other h_* and v_* members must be multiples of these.

h_total, h_blank_start, h_blank_len, h_sync_start, h_sync_len

Detailed monitor timings indicating the horizontal total, blanking start, length of blanking, horizontal sync start and length, given in units of h_granularity.

v_total, v_blank_start, v_blank_len, v_sync_start, v_sync_len

Detailed monitor timings indicating the vertical total, blanking start, length of blanking, horizontal sync start and length; given in units of lines.

flags

There are currently no flags defined.

Classification:

Photon

See also:

disp_modefuncs_t