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0.2.4 FastShiftIn
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rob tillaart
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@ -1,3 +1,18 @@
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platforms:
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rpipico:
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board: rp2040:rp2040:rpipico
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package: rp2040:rp2040
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gcc:
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features:
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defines:
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- ARDUINO_ARCH_RP2040
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warnings:
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flags:
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packages:
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rp2040:rp2040:
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url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
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compile:
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# Choosing to run compilation tests on 2 different Arduino platforms
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platforms:
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@ -8,5 +23,6 @@ compile:
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- m4
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- esp32
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# - esp8266
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- mega2560
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# - mega2560
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- rpipico
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28
libraries/FastShiftIn/CHANGELOG.md
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28
libraries/FastShiftIn/CHANGELOG.md
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# Change Log FastShiftIn
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All notable changes to this project will be documented in this file.
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The format is based on [Keep a Changelog](http://keepachangelog.com/)
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and this project adheres to [Semantic Versioning](http://semver.org/).
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## [0.2.4] - 2022-11-05
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- add changelog.md
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- add rp2040 to build-CI
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- update readme.md
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## [0.2.3] - 2021-17-12
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- update license
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- update readme - some badges
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- clean up unit test
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## [0.2.2] - 2020-12-22
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## No history ...
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## [0.1.0 - 2013-09-29
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- initial version
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@ -1,10 +1,12 @@
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//
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// FILE: FastShiftIn.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.3
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// VERSION: 0.2.4
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// PURPOSE: Fast ShiftIn for 74HC165 register, AVR optimized
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// DATE: 2013-09-29
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// URL: https://github.com/RobTillaart/FastShiftIn
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//
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// HISTORY: see changelog.md
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#include "FastShiftIn.h"
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@ -16,27 +18,27 @@ FastShiftIn::FastShiftIn(const uint8_t datapin, const uint8_t clockpin, const ui
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_value = 0;
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pinMode(datapin, INPUT);
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pinMode(clockpin, OUTPUT);
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// https://www.arduino.cc/reference/en/language/functions/advanced-io/shiftin/
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// https://www.arduino.cc/reference/en/language/functions/advanced-io/shiftin/
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digitalWrite(clockpin, LOW); // assume rising pulses from clock
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#if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_MEGAAVR)
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// uint8_t _datatimer = digitalPinToTimer(datapin);
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// if (_datatimer != NOT_ON_TIMER) turnOffPWM(_datatimer); TODO
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// uint8_t _datatimer = digitalPinToTimer(datapin);
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// if (_datatimer != NOT_ON_TIMER) turnOffPWM(_datatimer); TODO
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uint8_t _dataport = digitalPinToPort(datapin);
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_datain = portOutputRegister(_dataport);
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_databit = digitalPinToBitMask(datapin);
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// uint8_t _clocktimer = digitalPinToTimer(clockpin);
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// if (_clocktimer != NOT_ON_TIMER) turnOffPWM(_clocktimer);
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// uint8_t _clocktimer = digitalPinToTimer(clockpin);
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// if (_clocktimer != NOT_ON_TIMER) turnOffPWM(_clocktimer);
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uint8_t _clockport = digitalPinToPort(clockpin);
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_clockin = portOutputRegister(_clockport);
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_clockbit = digitalPinToBitMask(clockpin);
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#else
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// reference implementation
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// reuse these local vars as pin to save some space
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// reference implementation
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// reuse these local variables as pin to save some space
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_databit = datapin;
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_clockbit = clockpin;
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@ -113,7 +115,7 @@ int FastShiftIn::readMSBFIRST()
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return _value;
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#else
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// reference implementation
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// reference implementation
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_value = shiftIn(_databit, _clockbit, MSBFIRST);
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return _value;
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#endif
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@ -2,7 +2,7 @@
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//
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// FILE: FastShiftIn.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.3
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// VERSION: 0.2.4
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// PURPOSE: Fast ShiftIn for 74HC165 register, AVR optimized
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// DATE: 2013-09-29
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// URL: https://github.com/RobTillaart/FastShiftIn
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@ -11,13 +11,13 @@
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#include "Arduino.h"
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#define FASTSHIFTIN_LIB_VERSION (F("0.2.3"))
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#define FASTSHIFTIN_LIB_VERSION (F("0.2.4"))
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class FastShiftIn
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{
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public:
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// bitOrder = { LSBFIRST, MSBFIRST };
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// bitOrder = { LSBFIRST, MSBFIRST };
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FastShiftIn(const uint8_t datapin, const uint8_t clockpin, const uint8_t bitOrder = LSBFIRST);
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int read(void);
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@ -26,7 +26,7 @@ public:
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bool setBitOrder(const uint8_t bitOrder);
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uint8_t getBitOrder(void) { return _bitorder; };
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// overrule bitOrder (most optimized).
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// overrule bitOrder (most optimized).
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int readLSBFIRST(void);
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int readMSBFIRST(void);
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@ -0,0 +1,34 @@
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Arduino UNO
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IDE 1.8.19
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fastShiftIn_test.ino
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0.2.3
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8 bits HIGH
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Performance - time in us : read()
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FastShiftIn1: 20.42
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FastShiftIn2: 39.72
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Delta: 19.30
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Performance - time in us : readLSBFIRST()
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FastShiftIn1: 19.80
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FastShiftIn2: 38.84
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Delta: 19.04
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Performance - time in us : readMSBFIRST()
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FastShiftIn1: 19.80
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FastShiftIn2: 38.84
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Delta: 19.04
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Performance - time in us : reference shiftIn()
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Standard shiftIn1: 108.61
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Standard shiftIn2: 216.43
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Delta: 107.82
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done...
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@ -15,7 +15,7 @@
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"type": "git",
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"url": "https://github.com/RobTillaart/FastShiftIn.git"
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},
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"version": "0.2.3",
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"version": "0.2.4",
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"license": "MIT",
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"frameworks": "arduino",
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"platforms": "*",
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@ -1,5 +1,5 @@
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name=FastShiftIn
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version=0.2.3
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version=0.2.4
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author=Rob Tillaart <rob.tillaart@gmail.com>
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maintainer=Rob Tillaart <rob.tillaart@gmail.com>
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sentence=Arduino library for (AVR) optimized shiftIn - e.g. for 74HC165
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@ -10,7 +10,8 @@
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Arduino library for **AVR** optimized shiftIn - e.g. for 74HC165.
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A library for FastShiftOut also exist - https://github.com/RobTillaart/FastShiftOut
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- library for FastShiftOut - https://github.com/RobTillaart/FastShiftOut
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- library for FastShiftInOut - https://github.com/RobTillaart/FastShiftInOut
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## Description
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@ -31,6 +32,15 @@ The performance of **read()** is substantially faster than the default Arduino
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Exact how big the performance gain is can be seen with the example sketch.
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It does a comparison and shows how the class is to be used.
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test 0.2.3 Arduino UNO
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| function | time (us) |
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|:---------------------|----------:|
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| read() | 19.30 |
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| readLSBFIRST() | 19.04 |
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| readMSBFIRST() | 19.04 |
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| reference shiftIn() | 107.82 |
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## Interface
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