76 lines
2.1 KiB
C++
76 lines
2.1 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() {
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return this->input;
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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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//Load values
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digitalWrite(this->loadPin, LOW);
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digitalWrite(this->clockPin, HIGH);
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digitalWrite(this->loadPin, HIGH);
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digitalWrite(this->clockPin, 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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digitalWrite(this->clockInhPin, 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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input |= (digitalRead(this->dataPin) == HIGH ? 1 : 0) << inputBit;
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digitalWrite(clockPin, HIGH);
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digitalWrite(clockPin, LOW);
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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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digitalWrite(this->clockInhPin, HIGH);
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}
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return change;
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}
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