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Add arduino-alike GPIO pin control helpers

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Unlike the arduino functions, these don't take abstract pin numbers,
they take pin labels like `B0`.  Also, rather than taking very
generic parameter names, these take slightly more descriptive
enum values.

These improve the clarity of code that would otherwise be inscrutable
bit manipulation in tersely named port register names.
This commit is contained in:
Wez Furlong 2016-11-27 22:43:11 -08:00
parent be4e75423a
commit 8485bb34d2
1 changed files with 37 additions and 0 deletions
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37
quantum/pincontrol.h Normal file
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#pragma once
// Some helpers for controlling gpio pins
#include <avr/io.h>
enum {
PinDirectionInput = 0,
PinDirectionOutput = 1,
PinLevelHigh = 1,
PinLevelLow = 0,
};
// ex: pinMode(B0, PinDirectionOutput);
static inline void pinMode(uint8_t pin, int mode) {
uint8_t bv = _BV(pin & 0xf);
if (mode == PinDirectionOutput) {
_SFR_IO8((pin >> 4) + 1) |= bv;
} else {
_SFR_IO8((pin >> 4) + 1) &= ~bv;
_SFR_IO8((pin >> 4) + 2) &= ~bv;
}
}
// ex: digitalWrite(B0, PinLevelHigh);
static inline void digitalWrite(uint8_t pin, int mode) {
uint8_t bv = _BV(pin & 0xf);
if (mode == PinLevelHigh) {
_SFR_IO8((pin >> 4) + 2) |= bv;
} else {
_SFR_IO8((pin >> 4) + 2) &= ~bv;
}
}
// Return true if the pin is HIGH
// digitalRead(B0)
static inline bool digitalRead(uint8_t pin) {
return _SFR_IO8(pin >> 4) & _BV(pin & 0xf);
}