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)
2021-05-11 20:58:08 -04:00
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+/****************************************************************************************************************************
+  Argument_Complex.ino
+  RPi_Pico_ISR_Timer-Impl.h
+  For RP2040-based boards such as RASPBERRY_PI_PICO, ADAFRUIT_FEATHER_RP2040 and GENERIC_RP2040.
+  Written by Khoi Hoang
+
+  Built by Khoi Hoang https://github.com/khoih-prog/RPI_PICO_TimerInterrupt
+  Licensed under MIT license
+
+  The RPI_PICO system timer peripheral provides a global microsecond timebase for the system, and generates
+  interrupts based on this timebase. It supports the following features:
+    • A single 64-bit counter, incrementing once per microsecond
+    • This counter can be read from a pair of latching registers, for race-free reads over a 32-bit bus.
+    • Four alarms: match on the lower 32 bits of counter, IRQ on match: TIMER_IRQ_0-TIMER_IRQ_3
+
+  Now even you use all these new 16 ISR-based timers,with their maximum interval practically unlimited (limited only by
+  unsigned long miliseconds), you just consume only one RPI_PICO timer and avoid conflicting with other cores' tasks.
+  The accuracy is nearly perfect compared to software timers. The most important feature is they're ISR-based timers
+  Therefore, their executions are not blocked by bad-behaving functions / tasks.
+  This important feature is absolutely necessary for mission-critical tasks.
+
+  Based on SimpleTimer - A timer library for Arduino.
+  Author: mromani@ottotecnica.com
+  Copyright (c) 2010 OTTOTECNICA Italy
+
+  Based on BlynkTimer.h
+  Author: Volodymyr Shymanskyy
+
+  Version: 1.0.0
+
+  Version Modified By   Date      Comments
+  ------- -----------  ---------- -----------
+  1.0.0   K Hoang      11/05/2021 Initial coding to support RP2040-based boards such as RASPBERRY_PI_PICO. etc.
+*****************************************************************************************************************************/
+
+#if !( defined(ARDUINO_RASPBERRY_PI_PICO) || defined(ARDUINO_ADAFRUIT_FEATHER_RP2040) || defined(ARDUINO_GENERIC_RP2040) )
+  #error This code is intended to run on the RASPBERRY_PI_PICO platform! Please check your Tools->Board setting.
+#endif
+
+// These define's must be placed at the beginning before #include "TimerInterrupt_Generic.h"
+// _TIMERINTERRUPT_LOGLEVEL_ from 0 to 4
+// Don't define _TIMERINTERRUPT_LOGLEVEL_ > 0. Only for special ISR debugging only. Can hang the system.
+#define TIMER_INTERRUPT_DEBUG         1
+#define _TIMERINTERRUPT_LOGLEVEL_     4
+
+#include "RPi_Pico_TimerInterrupt.h"
+
+#if !defined(LED_BUILTIN)
+  #define LED_BUILTIN     25
+#endif
+
+// Init RPI_PICO_Timer
+RPI_PICO_Timer ITimer1(1);
+
+struct pinStruct
+{
+  unsigned int Pin1;
+  unsigned int Pin2;
+  unsigned int Pin3;
+};
+
+volatile pinStruct myOutputPins = { LED_BUILTIN, 0, 1 };
+
+bool TimerHandler(struct repeating_timer *t)
+{
+  static bool toggle = false;
+
+  //timer interrupt toggles pins
+#if (TIMER_INTERRUPT_DEBUG > 0)
+  Serial.print("Toggle pin1 = "); Serial.println( myOutputPins.Pin1 );
+#endif
+  
+  digitalWrite(myOutputPins.Pin1, toggle);
+
+#if (TIMER_INTERRUPT_DEBUG > 0)
+  Serial.print("Read pin2  ("); Serial.print( myOutputPins.Pin2 );
+  Serial.print(") = ");
+  Serial.println(digitalRead(myOutputPins.Pin2) ? "HIGH" : "LOW" );                          
+
+  Serial.print("Read pin3  ("); Serial.print( myOutputPins.Pin1 );
+  Serial.print(") = ");
+  Serial.println(digitalRead(myOutputPins.Pin3) ? "HIGH" : "LOW" );  
+#endif
+                 
+  toggle = !toggle;
+
+  return true;
+}
+
+#define TIMER_INTERVAL_MS    1000
+
+void setup()
+{
+  pinMode(myOutputPins.Pin1, OUTPUT);
+  pinMode(myOutputPins.Pin2, OUTPUT);
+  pinMode(myOutputPins.Pin3, OUTPUT);
+    
+  Serial.begin(115200);
+  while (!Serial);
+
+  Serial.print(F("\nStarting Argument_Complex on "));
+  Serial.println(BOARD_NAME);
+  Serial.println(RPI_PICO_TIMER_INTERRUPT_VERSION);
+  Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
+
+  // Interval in microsecs
+  if (ITimer1.attachInterruptInterval(TIMER_INTERVAL_MS  * 1000, TimerHandler))
+  {
+    Serial.print(F("Starting ITimer1 OK, millis() = ")); Serial.println(millis());
+  }
+  else
+    Serial.println(F("Can't set ITimer1. Select another freq. or timer"));
+}
+
+void loop()
+{
+}