38 lines
859 B
C
38 lines
859 B
C
#pragma once
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// Some helpers for controlling gpio pins
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#include <avr/io.h>
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enum {
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PinDirectionInput = 0,
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PinDirectionOutput = 1,
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PinLevelHigh = 1,
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PinLevelLow = 0,
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};
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// ex: pinMode(B0, PinDirectionOutput);
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static inline void pinMode(uint8_t pin, int mode) {
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uint8_t bv = _BV(pin & 0xf);
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if (mode == PinDirectionOutput) {
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_SFR_IO8((pin >> 4) + 1) |= bv;
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} else {
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_SFR_IO8((pin >> 4) + 1) &= ~bv;
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_SFR_IO8((pin >> 4) + 2) &= ~bv;
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}
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}
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// ex: digitalWrite(B0, PinLevelHigh);
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static inline void digitalWrite(uint8_t pin, int mode) {
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uint8_t bv = _BV(pin & 0xf);
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if (mode == PinLevelHigh) {
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_SFR_IO8((pin >> 4) + 2) |= bv;
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} else {
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_SFR_IO8((pin >> 4) + 2) &= ~bv;
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}
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}
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// Return true if the pin is HIGH
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// digitalRead(B0)
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static inline bool digitalRead(uint8_t pin) {
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return _SFR_IO8(pin >> 4) & _BV(pin & 0xf);
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}
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