void displayNextLine() {
// First things first: latch in the values we clocked in
// last time.
PORTC |= SH_BIT_OE; // Turn off the LED drivers (inverted)
PORTC |= SH_BIT_LE; // latch the shift register
PORTC &= ~SH_BIT_LE; // un-latch
// Pick our line
select_line();
PORTC &= ~SH_BIT_OE; // Turn the LED drivers back on.
// Great, that's done, now we can prepare the next line
// interlace lines, probably looks better.
g_line+=2;
if(g_line==LED_LINES) {
g_line=1;
}
// on to the next brightness level.
if(g_line>LED_LINES) {
g_line=0;
g_level++;
if (g_level>=BRIGHTNESS_LEVELS) {
g_level=0;
}
// Change the timer frequency to give us a better range of brightness
// When it's linear the brightness levels got more same-y toward the top
if (g_level < 6)
OCR1A = 100;
else if (g_level < 11)
OCR1A = 200;
else
OCR1A = 300;
}
g_circle++;
if (g_circle == CIRCLE) {
// It appears we've completed a whole frame! Now's the time to decide
// if we're going to switch buffers.
buffer_status[g_bufCurr] = BUFFER_CLEAN;
buffer_status[g_bufNext] = BUFFER_BUSY;
g_bufCurr = g_bufNext;
}
// Send stuff out the shift register.
shift_24_bit();
}
//sweep the specific line,used in the Timer1 ISR
void flash_line(unsigned char line,unsigned char level)
{
disable_oe;
close_all_line;
shift_24_bit(line,level);
open_line(line);
enable_oe;
}
