Monochrome Character Framebuffer

Public Monochrome Character Framebuffer API. More...

Data Structures
struct	cfb_font
struct	cfb_position

Macros
#define	FONT_ENTRY_DEFINE(_name, _width, _height, _caps, _data, _fc, _lc)
	Macro for creating a font entry.

Enumerations
enum	cfb_display_param {   CFB_DISPLAY_HEIGH = 0 , CFB_DISPLAY_WIDTH , CFB_DISPLAY_PPT , CFB_DISPLAY_ROWS ,   CFB_DISPLAY_COLS }
enum	cfb_font_caps { CFB_FONT_MONO_VPACKED = BIT(0) , CFB_FONT_MONO_HPACKED = BIT(1) , CFB_FONT_MSB_FIRST = BIT(2) }

Functions
int	cfb_print (const struct device *dev, const char *const str, uint16_t x, uint16_t y)
	Print a string into the framebuffer.
int	cfb_draw_text (const struct device *dev, const char *const str, int16_t x, int16_t y)
	Print a string into the framebuffer.
int	cfb_draw_point (const struct device *dev, const struct cfb_position *pos)
	Draw a point.
int	cfb_draw_line (const struct device *dev, const struct cfb_position *start, const struct cfb_position *end)
	Draw a line.
int	cfb_draw_rect (const struct device *dev, const struct cfb_position *start, const struct cfb_position *end)
	Draw a rectangle.
int	cfb_framebuffer_clear (const struct device *dev, bool clear_display)
	Clear framebuffer.
int	cfb_framebuffer_invert (const struct device *dev)
	Invert Pixels.
int	cfb_invert_area (const struct device *dev, uint16_t x, uint16_t y, uint16_t width, uint16_t height)
	Invert Pixels in selected area.
int	cfb_framebuffer_finalize (const struct device *dev)
	Finalize framebuffer and write it to display RAM, invert or reorder pixels if necessary.
int	cfb_get_display_parameter (const struct device *dev, enum cfb_display_param)
	Get display parameter.
int	cfb_framebuffer_set_font (const struct device *dev, uint8_t idx)
	Set font.
int	cfb_set_kerning (const struct device *dev, int8_t kerning)
	Set font kerning (spacing between individual letters).
int	cfb_get_font_size (const struct device *dev, uint8_t idx, uint8_t *width, uint8_t *height)
	Get font size.
int	cfb_get_numof_fonts (const struct device *dev)
	Get number of fonts.
int	cfb_framebuffer_init (const struct device *dev)
	Initialize Character Framebuffer.

Detailed Description

Public Monochrome Character Framebuffer API.

Macro Definition Documentation

FONT_ENTRY_DEFINE

#define FONT_ENTRY_DEFINE	(		_name,
			_width,
			_height,
			_caps,
			_data,
			_fc,
			_lc
	)

#include <zephyr/display/cfb.h>

Value:

        static const STRUCT_SECTION_ITERABLE(cfb_font, _name) = {              \
                .data = _data,                                                 \
                .caps = _caps,                                                 \
                .width = _width,                                               \
                .height = _height,                                             \
                .first_char = _fc,                                             \
                .last_char = _lc,                                              \
        }

Macro for creating a font entry.

Parameters

_name	Name of the font entry.
_width	Width of the font in pixels
_height	Height of the font in pixels.
_caps	Font capabilities.
_data	Raw data of the font.
_fc	Character mapped to first font element.
_lc	Character mapped to last font element.

Enumeration Type Documentation

cfb_display_param

enum cfb_display_param

#include <zephyr/display/cfb.h>

Enumerator
CFB_DISPLAY_HEIGH
CFB_DISPLAY_WIDTH
CFB_DISPLAY_PPT
CFB_DISPLAY_ROWS
CFB_DISPLAY_COLS

cfb_font_caps

enum cfb_font_caps

#include <zephyr/display/cfb.h>

Enumerator
CFB_FONT_MONO_VPACKED
CFB_FONT_MONO_HPACKED
CFB_FONT_MSB_FIRST

Function Documentation

cfb_draw_line()

int cfb_draw_line	(	const struct device *	dev,
		const struct cfb_position *	start,
		const struct cfb_position *	end
	)

#include <zephyr/display/cfb.h>

Draw a line.

Parameters

dev	Pointer to device structure for driver instance
start	start position of the line
end	end position of the line

Returns

0 on success, negative value otherwise

cfb_draw_point()

int cfb_draw_point	(	const struct device *	dev,
		const struct cfb_position *	pos
	)

#include <zephyr/display/cfb.h>

Draw a point.

Parameters

dev	Pointer to device structure for driver instance
pos	position of the point

Returns

0 on success, negative value otherwise

cfb_draw_rect()

int cfb_draw_rect	(	const struct device *	dev,
		const struct cfb_position *	start,
		const struct cfb_position *	end
	)

#include <zephyr/display/cfb.h>

Draw a rectangle.

Parameters

dev	Pointer to device structure for driver instance
start	Top-Left position of the rectangle
end	Bottom-Right position of the rectangle

Returns

0 on success, negative value otherwise

cfb_draw_text()

int cfb_draw_text	(	const struct device *	dev,
		const char *const	str,
		int16_t	x,
		int16_t	y
	)

#include <zephyr/display/cfb.h>

Print a string into the framebuffer.

For compare to cfb_print, cfb_draw_text accept non tile-aligned coords and not line wrapping.

Parameters

dev	Pointer to device structure for driver instance
str	String to print
x	Position in X direction of the beginning of the string
y	Position in Y direction of the beginning of the string

Returns

0 on success, negative value otherwise

cfb_framebuffer_clear()

int cfb_framebuffer_clear	(	const struct device *	dev,
		bool	clear_display
	)

#include <zephyr/display/cfb.h>

Clear framebuffer.

Parameters

dev	Pointer to device structure for driver instance
clear_display	Clear the display as well

Returns

0 on success, negative value otherwise

cfb_framebuffer_finalize()

int cfb_framebuffer_finalize

(

const struct device *

dev

)

#include <zephyr/display/cfb.h>

Finalize framebuffer and write it to display RAM, invert or reorder pixels if necessary.

Parameters

dev	Pointer to device structure for driver instance

Returns

0 on success, negative value otherwise

cfb_framebuffer_init()

int cfb_framebuffer_init

(

const struct device *

dev

)

#include <zephyr/display/cfb.h>

Initialize Character Framebuffer.

Parameters

dev	Pointer to device structure for driver instance

Returns

0 on success, negative value otherwise

cfb_framebuffer_invert()

int cfb_framebuffer_invert

(

const struct device *

dev

)

#include <zephyr/display/cfb.h>

Invert Pixels.

Parameters

dev	Pointer to device structure for driver instance

Returns

0 on success, negative value otherwise

cfb_framebuffer_set_font()

int cfb_framebuffer_set_font	(	const struct device *	dev,
		uint8_t	idx
	)

#include <zephyr/display/cfb.h>

Set font.

Parameters

dev	Pointer to device structure for driver instance
idx	Font index

Returns

0 on success, negative value otherwise

cfb_get_display_parameter()

int cfb_get_display_parameter	(	const struct device *	dev,
		enum	cfb_display_param
	)

#include <zephyr/display/cfb.h>

Get display parameter.

Parameters

dev	Pointer to device structure for driver instance
cfb_display_param	One of the display parameters

Returns

Display parameter value

cfb_get_font_size()

int cfb_get_font_size	(	const struct device *	dev,
		uint8_t	idx,
		uint8_t *	width,
		uint8_t *	height
	)

#include <zephyr/display/cfb.h>

Get font size.

Parameters

dev	Pointer to device structure for driver instance
idx	Font index
width	Pointers to the variable where the font width will be stored.
height	Pointers to the variable where the font height will be stored.

Returns

0 on success, negative value otherwise

cfb_get_numof_fonts()

int cfb_get_numof_fonts

(

const struct device *

dev

)

#include <zephyr/display/cfb.h>

Get number of fonts.

Parameters

dev	Pointer to device structure for driver instance

Returns

number of fonts

cfb_invert_area()

int cfb_invert_area	(	const struct device *	dev,
		uint16_t	x,
		uint16_t	y,
		uint16_t	width,
		uint16_t	height
	)

#include <zephyr/display/cfb.h>

Invert Pixels in selected area.

Parameters

dev	Pointer to device structure for driver instance
x	Position in X direction of the beginning of area
y	Position in Y direction of the beginning of area
width	Width of area in pixels
height	Height of area in pixels

Returns

0 on success, negative value otherwise

cfb_print()

int cfb_print	(	const struct device *	dev,
		const char *const	str,
		uint16_t	x,
		uint16_t	y
	)

#include <zephyr/display/cfb.h>

Print a string into the framebuffer.

Parameters

dev	Pointer to device structure for driver instance
str	String to print
x	Position in X direction of the beginning of the string
y	Position in Y direction of the beginning of the string

Returns

0 on success, negative value otherwise

cfb_set_kerning()

int cfb_set_kerning	(	const struct device *	dev,
		int8_t	kerning
	)

#include <zephyr/display/cfb.h>

Set font kerning (spacing between individual letters).

Parameters

dev	Pointer to device structure for driver instance
kerning	Font kerning

Returns

0 on success, negative value otherwise