simple plasma effect

gistfile1.txt

	for (uint16_t i = 0; i < 256; i++) {
		sin_table[i] = (cos(i/2)*sin(i))*31 + 32;
	}

	while(1) {
		pcd8544_gotoxy(&lcd, 0, 0);
		for (uint8_t x = 0; x<PCD8544_W; x++) {
			for (uint8_t y = 0; y<PCD8544_H; ) {

				yt = y >> 3;
				
				c = sin_table [ (uint8_t)(i + ((uint8_t)hypot(42 - x, 24 - y) >> 1)) ];

				if (common_ditherPoint(c,x,y)) {
					buff |= _BV( y - (yt << 3) );
				}

				if (!(++y & 0x07)) {
					pcd8544_putblock(&lcd, x, yt, buff);
					buff = 0;
				}
			}
		}
		--i;
	}