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/*
atmega32_ssd1306.c
Copyright 2014 Doug Szumski <d.s.szumski@gmail.com>
This file is part of simavr.
simavr is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
simavr is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with simavr. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <avr/io.h>
#include <util/delay.h>
#undef F_CPU
#define F_CPU 7380000
#include "avr_mcu_section.h"
AVR_MCU(F_CPU, "atmega32");
#include "ssd1306.h"
#include "images.h"
#define DEFAULT_DELAY 10000
void
spi_init (void)
{
DDRB |= (1 << PB4) | (1 << PB5) | (1 << PB7) | (1 << PB3) | (1 << PB1);
SPCR |= (1 << SPE) | (1 << MSTR);
// Double the speed
SPSR |= (1 << SPI2X);
}
void
demo_set_contrast (void)
{
for (uint16_t contrast = 0; contrast <= 255; contrast++)
{
PORTB ^= (1 << PB0);
ssd1306_set_contrast (contrast);
_delay_ms (DEFAULT_DELAY/200);
}
}
void
demo_show_image (void)
{
ssd1306_write_image_fb (logo);
ssd1306_display_fb ();
_delay_ms (DEFAULT_DELAY);
}
/* Draw some dots by writing directly to the VRAM */
void
demo_set_byte_direct (void)
{
ssd1306_clear_screen ();
uint8_t x = 0;
for (uint8_t page = 0; page < SSD1306_PIXEL_PAGES; ++page)
{
for (x = 0; x < SSD1306_X_PIXELS; x += 2)
{
ssd1306_write_byte (x, page, 0xAA);
}
}
_delay_ms (DEFAULT_DELAY);
}
/* Draw some stripes by setting individual pixels on the frame buffer */
void
demo_set_pixels (void)
{
ssd1306_clear_fb ();
uint8_t x = 0;
for (uint8_t y = 0; y < SSD1306_Y_PIXELS; ++y)
{
for (x = 0; x < SSD1306_X_PIXELS; x += 2)
{
ssd1306_set_pixel_fb (x, y, PIXEL_STATE_ON);
}
}
ssd1306_display_fb ();
_delay_ms (DEFAULT_DELAY);
}
void
demo_clear_screen (void)
{
// Turn all pixels on
memset (ssd1306_frame_buffer_g, 0xFF, SSD1306_PIXEL_BYTES);
ssd1306_display_fb ();
_delay_ms (DEFAULT_DELAY);
// Clear screen
ssd1306_clear_screen ();
_delay_ms (DEFAULT_DELAY);
}
void
demo_set_power_state (void)
{
ssd1306_set_power_state (POWER_STATE_SLEEP);
_delay_ms (DEFAULT_DELAY);
ssd1306_set_power_state (POWER_STATE_ON);
_delay_ms (DEFAULT_DELAY);
}
void
demo_rotate_display (void)
{
for (uint8_t i = DISP_ORIENT_NORMAL;
i <= DISP_ORIENT_UPSIDE_DOWN_MIRRORED; ++i)
{
ssd1306_set_display_orientation (i);
ssd1306_write_image_fb (logo);
ssd1306_display_fb ();
_delay_ms (DEFAULT_DELAY);
}
}
void
demo_invert_image ()
{
ssd1306_set_display_orientation (DISP_ORIENT_NORMAL);
for (uint8_t i = DISPLAY_MODE_NORMAL; i <= DISPLAY_MODE_INVERTED; ++i)
{
ssd1306_set_display_mode (i);
ssd1306_write_image_fb (logo);
ssd1306_display_fb ();
// Check inverted contrast works
demo_set_contrast ();
}
}
int
main ()
{
spi_init ();
/*
* Demonstrate the virtual part functionality. Runs approx 10 times
* faster on an i7-3740QM CPU @ 2.70GHz than in real life.
*/
for (;;)
{
ssd1306_init_display ();
demo_show_image ();
demo_set_power_state ();
demo_set_contrast ();
demo_set_byte_direct ();
demo_set_pixels ();
demo_clear_screen ();
demo_rotate_display ();
demo_invert_image ();
}
}
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