Khoi Hoang
b7d8f4b4b7
### Releases v1.3.1 1. Using `float` instead of `ulong` for better interval accuracy
103 lines
3.6 KiB
Arduino
103 lines
3.6 KiB
Arduino
/****************************************************************************************************************************
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Argument_Complex.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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*****************************************************************************************************************************/
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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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// Can be included as many times as necessary, without `Multiple Definitions` Linker Error
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#include "RPi_Pico_TimerInterrupt.h"
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#if !defined(LED_BUILTIN)
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#define LED_BUILTIN 25
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#endif
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// Init RPI_PICO_Timer
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RPI_PICO_Timer ITimer1(1);
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struct pinStruct
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{
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unsigned int Pin1;
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unsigned int Pin2;
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unsigned int Pin3;
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};
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volatile pinStruct myOutputPins = { LED_BUILTIN, 0, 1 };
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bool TimerHandler(struct repeating_timer *t)
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{
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(void) t;
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static bool toggle = false;
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//timer interrupt toggles pins
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#if (TIMER_INTERRUPT_DEBUG > 0)
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Serial.print("Toggle pin1 = "); Serial.println( myOutputPins.Pin1 );
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#endif
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digitalWrite(myOutputPins.Pin1, toggle);
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#if (TIMER_INTERRUPT_DEBUG > 0)
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Serial.print("Read pin2 ("); Serial.print( myOutputPins.Pin2 );
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Serial.print(") = ");
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Serial.println(digitalRead(myOutputPins.Pin2) ? "HIGH" : "LOW" );
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Serial.print("Read pin3 ("); Serial.print( myOutputPins.Pin1 );
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Serial.print(") = ");
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Serial.println(digitalRead(myOutputPins.Pin3) ? "HIGH" : "LOW" );
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#endif
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toggle = !toggle;
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return true;
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}
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#define TIMER_INTERVAL_MS 1000
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void setup()
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{
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pinMode(myOutputPins.Pin1, OUTPUT);
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pinMode(myOutputPins.Pin2, OUTPUT);
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pinMode(myOutputPins.Pin3, OUTPUT);
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Serial.begin(115200);
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while (!Serial);
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Serial.print(F("\nStarting Argument_Complex 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(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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}
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void loop()
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{
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}
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