35 lines
1.1 KiB
C++
35 lines
1.1 KiB
C++
#include "RowPort_AVR_Optic.h"
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/*
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configures row port's DDRx and PORTx pins as output.
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*/
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RowPort_AVR_Optic::RowPort_AVR_Optic
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(volatile unsigned char& DDRx, volatile unsigned char& PORTx)
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: DDR(DDRx = ~0), PORT(PORTx)
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{}
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/*
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activePin is a port mask, where active pin is 1.
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*/
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void RowPort_AVR_Optic::setActivePinLow(const uint8_t activePin)
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{
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PORT &= ~activePin;
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}
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/*
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activePin is port mask, where active pin is 1.
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The delayMicroseconds() is for DodoHand keyboard's optic switches.
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Strobe needs to be turned on for >= 300µs before the columns are read.
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During this time the state of the columns are settling into their actual values.
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Seems to be necessary in order to allow the phototransistors to turn completely off.
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(delay is not need for I/O expander because time between I2C Transmissions)
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(Teensy2 ATMEGA32U4 16 MHz is a 0.0625 µs period)
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*/
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void RowPort_AVR_Optic::setActivePinHigh(const uint8_t activePin)
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{
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//strobe row on
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PORT |= activePin;
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delayMicroseconds(300); //wait for the column value to stabilize after strobe
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}
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