How fast? To test the speed of port manipulation vs. At the start I mentioned that using port manipulation was a lot faster than using regular Arduino I/O functions. Then it alternates turning on and off alternating halves of digital pins 0~7. It sets digital pins 7~0 to output in void setup(). Digital 0~7 set to outputs, then on/off using port manipulationĭDRD = B11111111 // set PORTD (digital 7~0) to outputs
This is demonstrated in the following example: Where y is the register type (B/C/D) and xxxxxxxx are eight status bits – 1 for HIGH, 0 for LOW. The LSB (least-significant bit ) is the lowest pin number for that register.
Where y is the register type (B/C/D) and xxxxxxxx are eight bits that determine if a pin is to be an input or output.
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