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8485bb34d2
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.
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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