AVR-LabPower/st7565-graphics.c at master · markusb/AVR-LabPower · GitHub

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/*
*
* Graphic display driver for LCD with ST7565 controller
*
* Originally by Sebastian, see http://www.mikrocontroller.net/topic/75589
*
* Reorganized and modified by Markus Baertschi
*/

#include <stdio.h>
#include <avr/pgmspace.h>
#include "st7565-driver.h"
#include "st7565-graphics.h"
#include "st7565-font-std.h"
#define G_FONT_DEFAULT font_standard

// Invert all draw functions
uint8_t g_inverted = 0;


void g_init()
{
	disp_init();
}

void g_clear()
{
	disp_clear();
}

void g_clear_dont_refresh()
{
	disp_clear_dont_refresh();
}

void g_draw_pixel(uint8_t x, uint8_t y)
{
	disp_set_pixel(x, y, 1 - g_inverted);
}

void g_clear_pixel(uint8_t x, uint8_t y)
{
	disp_set_pixel(x, y, 0 + g_inverted);
}

void g_draw_line(uint8_t x, uint8_t y, int16_t len, uint8_t direction)
{
	// direction: 0 = horizontal,
	//            1 = vertical

	if (direction == 0)
	{
		if (len > 0)
			for (; len > 0; len--, x++)
				disp_set_pixel(x, y, 1);
		else
			for (; len < 0; len++, x--)
				disp_set_pixel(x, y, 1);
	}
	else
	{
		if (len > 0)
			for (; len > 0; len--, y++)
				disp_set_pixel(x, y, 1);
		else
			for (; len < 0; len++, y--)
				disp_set_pixel(x, y, 1);
	}
}

void g_draw_rect(uint8_t x, uint8_t y, uint8_t w, uint8_t h)
{
	g_draw_line_h(x,         y,         (int16_t)w);
	g_draw_line_h(x,         y + h - 1, (int16_t)w);
	g_draw_line_v(x,         y,         (int16_t)h);
	g_draw_line_v(x + w - 1, y,         (int16_t)h);
}

void g_fill_rect(uint8_t x, uint8_t y, uint8_t w, uint8_t h)
{
	for (; h > 0; h--, y++)
		g_draw_line_h(x, y, (int16_t)w);
}

void g_draw_data_column_transparentBG(int8_t x, uint8_t y, uint8_t data)
{
	uint8_t row;
	for (row = 0; row < 8; row++,y++)
	{
		if ((data & (1<<row)) != 0)
			g_draw_pixel(x, y);
	}
}

void g_draw_data_column_clearBG(int8_t x, uint8_t y, uint8_t data)
{
	uint8_t row;
	for (row = 0; row < 8; row++,y++)
	{
		if ((data & (1<<row)) != 0)
			g_draw_pixel(x, y);
		else
			g_clear_pixel(x, y);
	}
}

uint8_t g_draw_char_transparentBG(uint8_t x, uint8_t y, uint8_t c)
{
	uint8_t w = 0; //width of drawn character (return value)

	uint16_t addr = (uint16_t)(&G_FONT_DEFAULT[c-0x20]);
	uint8_t data = 0x00;

	while (data != 0xAA && w++ < 7)
	{
		data = pgm_read_byte(addr);
		if (data != 0xAA)
			g_draw_data_column_transparentBG(x++, y, data);
		else
			w--;
		addr++;
	}
	if (w > 7) w = 7;
	return (w);
}

uint8_t g_draw_char_clearBG(uint8_t x, uint8_t y, uint8_t c)
{
	uint8_t w = 0; //width of drawn character (return value)

	uint16_t addr = (uint16_t)(&G_FONT_DEFAULT[c-0x20]);
	uint8_t data = 0x00;

	while (data != 0xAA && w++ < 7)
	{
		data = pgm_read_byte(addr);
		if (data != 0xAA)
			g_draw_data_column_clearBG(x++, y, data);
		else
			w--;
		addr++;
	}
	if (w > 7) w = 7;
	return (w);
}

uint8_t g_draw_string(uint8_t x, uint8_t y, char *s, uint8_t transparent_background)
{
	if (transparent_background)
		while (*s)
		{   // so lange *s != '\0' also ungleich dem "String-Endezeichen"
			x += g_draw_char_transparentBG(x, y, *s) + 1;
			s++;
		}
	else
		while (*s)
		{   // so lange *s != '\0' also ungleich dem "String-Endezeichen"
			x += g_draw_char_clearBG(x, y, *s) + 1;
			s++;
		}
}

/*

void g_frame_begin()
{
	disp_frame_begin();
}

void g_frame_end()
{
	disp_frame_end();
}

*/