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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ISR_Timers_Array_Simple.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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#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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#include "RPi_Pico_ISR_Timer.h"
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#include <SimpleTimer.h> // https://github.com/schinken/SimpleTimer
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// Init RPI_PICO_Timer
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RPI_PICO_Timer ITimer1(1);
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RPI_PICO_ISR_Timer ISR_timer;
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#ifndef LED_BUILTIN
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#define LED_BUILTIN 25
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#endif
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#define LED_TOGGLE_INTERVAL_MS 1000L
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// You have to use longer time here if having problem because Arduino AVR clock is low, 16MHz => lower accuracy.
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// Tested OK with 1ms when not much load => higher accuracy.
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#define TIMER_INTERVAL_MS 1L
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volatile uint32_t startMillis = 0;
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volatile uint32_t deltaMillis2s = 0;
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volatile uint32_t deltaMillis5s = 0;
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volatile uint32_t previousMillis2s = 0;
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volatile uint32_t previousMillis5s = 0;
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bool TimerHandler(struct repeating_timer *t)
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{
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static bool toggle = false;
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static int timeRun = 0;
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ISR_timer.run();
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// Toggle LED every LED_TOGGLE_INTERVAL_MS = 2000ms = 2s
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if (++timeRun == ((LED_TOGGLE_INTERVAL_MS) / TIMER_INTERVAL_MS) )
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{
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timeRun = 0;
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//timer interrupt toggles pin LED_BUILTIN
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digitalWrite(LED_BUILTIN, toggle);
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toggle = !toggle;
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}
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return true;
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}
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void doingSomething2s()
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{
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unsigned long currentMillis = millis();
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deltaMillis2s = currentMillis - previousMillis2s;
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previousMillis2s = currentMillis;
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}
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void doingSomething5s()
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{
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unsigned long currentMillis = millis();
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deltaMillis5s = currentMillis - previousMillis5s;
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previousMillis5s = currentMillis;
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}
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/////////////////////////////////////////////////
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#define SIMPLE_TIMER_MS 2000L
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// Init SimpleTimer
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SimpleTimer simpleTimer;
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// Here is software Timer, you can do somewhat fancy stuffs without many issues.
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// But always avoid
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// 1. Long delay() it just doing nothing and pain-without-gain wasting CPU power.Plan and design your code / strategy ahead
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// 2. Very long "do", "while", "for" loops without predetermined exit time.
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void simpleTimerDoingSomething2s()
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{
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static unsigned long previousMillis = startMillis;
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unsigned long currMillis = millis();
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Serial.print(F("SimpleTimer : programmed ")); Serial.print(SIMPLE_TIMER_MS);
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Serial.print(F("ms, current time ms : ")); Serial.print(currMillis);
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Serial.print(F(", Delta ms : ")); Serial.println(currMillis - previousMillis);
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Serial.print(F("Timer2s actual : ")); Serial.println(deltaMillis2s);
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Serial.print(F("Timer5s actual : ")); Serial.println(deltaMillis5s);
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previousMillis = currMillis;
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}
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////////////////////////////////////////////////
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void setup()
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{
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pinMode(LED_BUILTIN, OUTPUT);
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Serial.begin(115200);
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while (!Serial);
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Serial.print(F("\nStarting ISR_Timers_Array_Simple on "));
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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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if (ITimer1.attachInterruptInterval(TIMER_INTERVAL_MS * 1000, TimerHandler))
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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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ISR_timer.setInterval(2000L, doingSomething2s);
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ISR_timer.setInterval(5000L, doingSomething5s);
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// You need this timer for non-critical tasks. Avoid abusing ISR if not absolutely necessary.
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simpleTimer.setInterval(SIMPLE_TIMER_MS, simpleTimerDoingSomething2s);
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}
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#define BLOCKING_TIME_MS 10000L
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void loop()
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{
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// This unadvised blocking task is used to demonstrate the blocking effects onto the execution and accuracy to Software timer
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// You see the time elapse of ISR_Timer still accurate, whereas very unaccurate for Software Timer
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// The time elapse for 2000ms software timer now becomes 3000ms (BLOCKING_TIME_MS)
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// While that of ISR_Timer is still prefect.
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delay(BLOCKING_TIME_MS);
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// You need this Software timer for non-critical tasks. Avoid abusing ISR if not absolutely necessary
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// You don't need to and never call ISR_Timer.run() here in the loop(). It's already handled by ISR timer.
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simpleTimer.run();
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}
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