void draw_same(void) {
redraw_same = 1;
draw_continue();
draw_next();
}
int main (void)
{
unsigned pagenum = 0, backlight, contrast = 0x3f;
unsigned left_pressed = 0, right_pressed = 0;
unsigned up_pressed = 0, down_pressed = 0;
extern const gpanel_font_t font_fixed6x8;
led_init();
joystick_init ();
gpanel_init (&display, &font_fixed6x8);
draw (pagenum);
backlight = 1;
gpanel_backlight (&display, backlight);
/*
* Poll buttons.
*/
for (;;) {
mdelay (20);
draw_next (pagenum);
int key = joystick_get();
/* Light LED when a key is pressed. */
if (key > JOYSTICK_IDLE)
led_control (1);
else
led_control (0);
if (key != JOYSTICK_LEFT)
left_pressed = 0;
else if (! left_pressed) {
/* Left button: show previous page of symbols. */
left_pressed = 1;
pagenum = (pagenum - 1 + NPAGES) % NPAGES;
draw (pagenum);
}
if (key != JOYSTICK_RIGHT)
right_pressed = 0;
else if (! right_pressed) {
/* Right button: show next page of symbols. */
right_pressed = 1;
pagenum = (pagenum + 1) % NPAGES;
draw (pagenum);
}
if (key != JOYSTICK_DOWN)
down_pressed = 0;
else if (! down_pressed) {
/* Down button: switch backlight. */
down_pressed = 1;
backlight = !backlight;
gpanel_backlight (&display, backlight);
}
if (key != JOYSTICK_UP)
up_pressed = 0;
else if (! up_pressed) {
/* Up button: contrast control. */
up_pressed = 1;
contrast++;
if (contrast >= 127)
contrast = 0;
gpanel_contrast (&display, contrast);
gpanel_move (&display, 0, 0);
printf (&display, "Vop = %-8u\n", contrast);
}
}
}
