98 lines
2.8 KiB
C++
98 lines
2.8 KiB
C++
/*
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Copyright 2018 Sam Stevens
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include <Arduino.h>
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#include "ShiftInput.h"
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ShiftInput::ShiftInput(uint8_t chipCount, uint8_t loadPin, uint8_t clockPin, uint8_t clockInhPin, uint8_t dataPin) {
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this->input = (uint8_t*)calloc(chipCount, sizeof(uint8_t));
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this->chipCount = chipCount;
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this->loadPin = loadPin;
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this->clockPin = clockPin;
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this->clockInhPin = clockInhPin;
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this->dataPin = dataPin;
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pinMode(loadPin, OUTPUT);
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digitalWrite(loadPin, HIGH);
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pinMode(clockPin, OUTPUT);
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digitalWrite(clockPin, LOW);
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pinMode(clockInhPin, OUTPUT);
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if (clockInhPin > 0) {
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digitalWrite(clockInhPin, HIGH);
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pinMode(dataPin, INPUT);
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}
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}
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uint8_t ShiftInput::getInput(uint8_t chip) {
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if (chip <= this->chipCount) {
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return this->input[chip];
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}
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return 0;
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}
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uint8_t ShiftInput::getChipCount() {
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return this->chipCount;
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}
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bool ShiftInput::updateInput() {
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uint8_t dataBit = digitalPinToBitMask(this->dataPin);
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volatile uint8_t *dataPort = portInputRegister(digitalPinToPort(this->dataPin));
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uint8_t loadBit = digitalPinToBitMask(this->loadPin);
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volatile uint8_t *loadPort = portOutputRegister(digitalPinToPort(this->loadPin));
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uint8_t clkBit = digitalPinToBitMask(this->clockPin);
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volatile uint8_t *clkPort = portOutputRegister(digitalPinToPort(this->clockPin));
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uint8_t clkInhBit = 0;
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volatile uint8_t *clkInhPort = NULL;
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if (this->clockInhPin > 0){
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clkInhBit = digitalPinToBitMask(this->clockInhPin);
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clkInhPort = portOutputRegister(digitalPinToPort(this->clockInhPin));
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}
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uint8_t oldSREG = SREG;
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cli();
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//Load values
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*loadPort &= ~loadBit; //Load Low
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*clkPort |= clkBit; //Clock High
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*loadPort |= loadBit; //Load High
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*clkPort &= ~clkBit; //Clock Low
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bool change = false;
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uint8_t input = 0;
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if (this->clockInhPin > 0){
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*clkInhPort &= ~clkInhBit;//Clock Inh Low
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}
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for(uint8_t chip = 0; chip < this->chipCount; chip++) {
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input = 0;
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for(uint8_t inputBit = 0; inputBit < 8; inputBit++) {
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*clkPort &= ~clkBit; //Clock Low
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input |= ((*dataPort & dataBit) ? 1 : 0) << inputBit;
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*clkPort |= clkBit; //Clock High
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}
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if (this->input[chip] != input) {
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this->input[chip] = input;
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change = true;
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}
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}
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if (this->clockInhPin > 0){
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*clkInhPort |= clkInhBit; //Clock Inh High
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}
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SREG = oldSREG;
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return change;
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}
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