Releases v1.0.0 to support RP2040-based boards
### Initial Releases v1.0.0 1. Initial coding to support RP2040-based boards such as RASPBERRY_PI_PICO. etc. using [Earle Philhower's arduino-pico core](https://github.com/earlephilhower/arduino-pico)
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Khoi Hoang
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/****************************************************************************************************************************
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SwitchDebounce.ino
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RPi_Pico_ISR_Timer-Impl.h
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For RP2040-based boards such as RASPBERRY_PI_PICO, ADAFRUIT_FEATHER_RP2040 and GENERIC_RP2040.
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Written by Khoi Hoang
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Built by Khoi Hoang https://github.com/khoih-prog/RPI_PICO_TimerInterrupt
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Licensed under MIT license
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The RPI_PICO system timer peripheral provides a global microsecond timebase for the system, and generates
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interrupts based on this timebase. It supports the following features:
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• A single 64-bit counter, incrementing once per microsecond
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• This counter can be read from a pair of latching registers, for race-free reads over a 32-bit bus.
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• Four alarms: match on the lower 32 bits of counter, IRQ on match: TIMER_IRQ_0-TIMER_IRQ_3
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Now even you use all these new 16 ISR-based timers,with their maximum interval practically unlimited (limited only by
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unsigned long miliseconds), you just consume only one RPI_PICO timer and avoid conflicting with other cores' tasks.
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The accuracy is nearly perfect compared to software timers. The most important feature is they're ISR-based timers
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Therefore, their executions are not blocked by bad-behaving functions / tasks.
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This important feature is absolutely necessary for mission-critical tasks.
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Based on SimpleTimer - A timer library for Arduino.
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Author: mromani@ottotecnica.com
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Copyright (c) 2010 OTTOTECNICA Italy
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Based on BlynkTimer.h
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Author: Volodymyr Shymanskyy
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Version: 1.0.0
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Version Modified By Date Comments
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------- ----------- ---------- -----------
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1.0.0 K Hoang 11/05/2021 Initial coding to support RP2040-based boards such as RASPBERRY_PI_PICO. etc.
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*****************************************************************************************************************************/
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/*
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Notes:
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Special design is necessary to share data between interrupt code and the rest of your program.
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Variables usually need to be "volatile" types. Volatile tells the compiler to avoid optimizations that assume
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variable can not spontaneously change. Because your function may change variables while your program is using them,
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the compiler needs this hint. But volatile alone is often not enough.
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When accessing shared variables, usually interrupts must be disabled. Even with volatile,
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if the interrupt changes a multi-byte variable between a sequence of instructions, it can be read incorrectly.
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If your data is multiple variables, such as an array and a count, usually interrupts need to be disabled
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or the entire sequence of your code which accesses the data.
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Switch Debouncing uses high frequency hardware timer 50Hz == 20ms) to measure the time from the SW is pressed,
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debouncing time is 100ms => SW is considered pressed if timer count is > 5, then call / flag SW is pressed
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When the SW is released, timer will count (debounce) until more than 50ms until consider SW is released.
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We can set to flag or call a function whenever SW is pressed more than certain predetermined time, even before
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SW is released.
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*/
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#if !( defined(ARDUINO_RASPBERRY_PI_PICO) || defined(ARDUINO_ADAFRUIT_FEATHER_RP2040) || defined(ARDUINO_GENERIC_RP2040) )
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#error This code is intended to run on the RASPBERRY_PI_PICO platform! Please check your Tools->Board setting.
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#endif
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// These define's must be placed at the beginning before #include "TimerInterrupt_Generic.h"
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// _TIMERINTERRUPT_LOGLEVEL_ from 0 to 4
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// Don't define _TIMERINTERRUPT_LOGLEVEL_ > 0. Only for special ISR debugging only. Can hang the system.
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#define TIMER_INTERRUPT_DEBUG 1
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#define _TIMERINTERRUPT_LOGLEVEL_ 4
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#include "RPi_Pico_TimerInterrupt.h"
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#define PIN_D1 1 // Pin D1 mapped to pin GPIO1 of RPI_PICO
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unsigned int SWPin = PIN_D1;
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#define TIMER1_INTERVAL_MS 20
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#define DEBOUNCING_INTERVAL_MS 100
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#define LONG_PRESS_INTERVAL_MS 5000
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#define LOCAL_DEBUG 2
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// Init RPI_PICO_Timer, can use any from 0-15 pseudo-hardware timers
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RPI_PICO_Timer ITimer1(1);
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volatile bool SWPressed = false;
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volatile bool SWLongPressed = false;
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bool TimerHandler1(struct repeating_timer *t)
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{
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static unsigned int debounceCountSWPressed = 0;
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static unsigned int debounceCountSWReleased = 0;
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#if (LOCAL_DEBUG > 1)
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static unsigned long SWPressedTime;
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static unsigned long SWReleasedTime;
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unsigned long currentMillis = millis();
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#endif
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if ( (!digitalRead(SWPin)) )
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{
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// Start debouncing counting debounceCountSWPressed and clear debounceCountSWReleased
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debounceCountSWReleased = 0;
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if (++debounceCountSWPressed >= DEBOUNCING_INTERVAL_MS / TIMER1_INTERVAL_MS)
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{
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// Call and flag SWPressed
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if (!SWPressed)
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{
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#if (LOCAL_DEBUG > 1)
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SWPressedTime = currentMillis;
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Serial.print("SW Press, from millis() = "); Serial.println(SWPressedTime);
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#endif
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SWPressed = true;
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// Do something for SWPressed here in ISR
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// But it's better to use outside software timer to do your job instead of inside ISR
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//Your_Response_To_Press();
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}
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if (debounceCountSWPressed >= LONG_PRESS_INTERVAL_MS / TIMER1_INTERVAL_MS)
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{
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// Call and flag SWLongPressed
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if (!SWLongPressed)
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{
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#if (LOCAL_DEBUG > 1)
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Serial.print("SW Long Pressed, total time ms = "); Serial.print(currentMillis);
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Serial.print(" - "); Serial.print(SWPressedTime);
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Serial.print(" = "); Serial.println(currentMillis - SWPressedTime);
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#endif
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SWLongPressed = true;
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// Do something for SWLongPressed here in ISR
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// But it's better to use outside software timer to do your job instead of inside ISR
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//Your_Response_To_Long_Press();
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}
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}
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}
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}
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else
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{
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// Start debouncing counting debounceCountSWReleased and clear debounceCountSWPressed
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if ( SWPressed && (++debounceCountSWReleased >= DEBOUNCING_INTERVAL_MS / TIMER1_INTERVAL_MS))
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{
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#if (LOCAL_DEBUG > 1)
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SWReleasedTime = currentMillis;
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// Call and flag SWPressed
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Serial.print("SW Released, from millis() = "); Serial.println(SWReleasedTime);
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#endif
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SWPressed = false;
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SWLongPressed = false;
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// Do something for !SWPressed here in ISR
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// But it's better to use outside software timer to do your job instead of inside ISR
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//Your_Response_To_Release();
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// Call and flag SWPressed
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#if (LOCAL_DEBUG > 1)
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Serial.print("SW Pressed total time ms = ");
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Serial.println(SWReleasedTime - SWPressedTime);
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#endif
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debounceCountSWPressed = 0;
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}
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}
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return true;
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}
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void setup()
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{
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pinMode(SWPin, INPUT_PULLUP);
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Serial.begin(115200);
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while (!Serial);
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delay(100);
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Serial.print(F("\nStarting SwitchDebounce on ")); Serial.println(BOARD_NAME);
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Serial.println(RPI_PICO_TIMER_INTERRUPT_VERSION);
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Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
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// Interval in microsecs
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if (ITimer1.attachInterruptInterval(TIMER1_INTERVAL_MS * 1000, TimerHandler1))
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{
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Serial.print(F("Starting ITimer1 OK, millis() = ")); Serial.println(millis());
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}
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else
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Serial.println(F("Can't set ITimer1. Select another freq. or timer"));
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}
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void loop()
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{
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}
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