s_pin
Defines pin number for fast pin mode operations.
s_pin data type is like an integer constant, but compiler will handle it to optimize digitalWrite() and digitalRead() to make faster operations on pins.
Direct reference will take about 0.5 μs, while indirect will take about 1-2 μs. See examples for digitalWrite() and digitalRead().
s_pin var = number;
By default pins 9—16 can be used in fast mode. ZUNO_REMAP_SPINS() can be used to change to another range.
ZUNO_REMAP_SPINS(portName)
portName
FAST_Px constant
none
| FAST_Px constant | pin range | Default I2C pins |
|---|
| FAST_P0 (default) | 9—16 | SCL=9 SDA=10 |
| FAST_P1 | 17—23 | SCL=17 SDA=18 |
| FAST_P2 | 0—2 | SCL=0 SDA=2 |
| FAST_P3 | 3—6 | SCL=3 SDA=4 |
