v1.1.2

### Releases v1.1.2

1. Fix compiler warnings.
2. Optimize examples to reduce memory usage by using Flash String whenever possible.
3. Clean-up all compiler warnings possible.
4. Add Table of Contents

Author: khoih-prog

README.md

@@ -22,7 +22,7 @@
   If your data is multiple variables, such as an array and a count, usually interrupts need to be disabled
   or the entire sequence of your code which accesses the data.
   
-  Version: 1.1.0
+  Version: 1.1.2
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -31,9 +31,21 @@
   1.0.2   K.Hoang      28/11/2019 Permit up to 16 super-long-time, super-accurate ISR-based timers to avoid being blocked
   1.0.3   K.Hoang      01/12/2020 Add complex examples ISR_16_Timers_Array_Complex and ISR_16_Timers_Array_Complex
   1.1.1   K.Hoang      06/12/2020 Add example Change_Interval. Bump up version to sync with other TimerInterrupt Libraries
+  1.1.2   K.Hoang      05/01/2021 Fix warnings. Optimize examples to reduce memory usage
 *****************************************************************************************************************************/
 
-//These define's must be placed at the beginning before #include "TimerInterrupt.h"
+#if defined(__AVR_ATmega8__) || defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) || \
+    defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega644__) || defined(__AVR_ATmega644A__) || \
+    defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__) || defined(ARDUINO_AVR_UNO) || defined(ARDUINO_AVR_NANO) || \
+    defined(ARDUINO_AVR_MINI) || defined(ARDUINO_AVR_ETHERNET) || defined(ARDUINO_AVR_FIO) || defined(ARDUINO_AVR_BT) || \
+    defined(ARDUINO_AVR_LILYPAD) || defined(ARDUINO_AVR_PRO) || defined(ARDUINO_AVR_NG) || defined(ARDUINO_AVR_UNO_WIFI_DEV_ED)
+
+#else
+  #error This is designed only for Arduino AVR board! Please check your Tools->Board setting.
+#endif
+
+// These define's must be placed at the beginning before #include "TimerInterrupt.h"
+// Don't define TIMER_INTERRUPT_DEBUG > 0. Only for special ISR debugging only. Can hang the system.
 #define TIMER_INTERRUPT_DEBUG      0
 
 #define USE_TIMER_1     true
@@ -67,15 +79,22 @@ void TimerHandler1(unsigned int outputPinsAddress)
   }
 
   //timer interrupt toggles pins
-  Serial.println("Toggle pin1 = " + String(((pinStruct *) outputPinsAddress)->Pin1) );
+#if (TIMER_INTERRUPT_DEBUG > 1)
+  Serial.print("Toggle pin1 = "); Serial.println( ((pinStruct *) outputPinsAddress)->Pin1 );
+#endif
+  
   digitalWrite(((pinStruct *) outputPinsAddress)->Pin1, toggle1);
 
-  Serial.println("Read pin2 A0 (" + String(((pinStruct *) outputPinsAddress)->Pin2) + ") = " +
-                 String( digitalRead(((pinStruct *) outputPinsAddress)->Pin2) ? "HIGH" : "LOW" ) );
-
-  Serial.println("Read pin3 A1 (" + String(((pinStruct *) outputPinsAddress)->Pin3) + ") = " +
-                 String( digitalRead(((pinStruct *) outputPinsAddress)->Pin3) ? "HIGH" : "LOW" ) );
+#if (TIMER_INTERRUPT_DEBUG > 1)
+  Serial.print("Read pin2 A0 ("); Serial.print(((pinStruct *) outputPinsAddress)->Pin2 );
+  Serial.print(") = ");
+  Serial.println(digitalRead(((pinStruct *) outputPinsAddress)->Pin2) ? "HIGH" : "LOW" );                          
 
+  Serial.print("Read pin3 A1 ("); Serial.print(((pinStruct *) outputPinsAddress)->Pin3 );
+  Serial.print(") = ");
+  Serial.println(digitalRead(((pinStruct *) outputPinsAddress)->Pin3) ? "HIGH" : "LOW" );  
+#endif
+                 
   toggle1 = !toggle1;
 }
 
@@ -86,9 +105,9 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println("\nStarting Argument_Complex");
+  Serial.println(F("\nStarting Argument_Complex on AVR"));
   Serial.println(TIMER_INTERRUPT_VERSION);
-  Serial.println("CPU Frequency = " + String(F_CPU / 1000000) + " MHz");
+  Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
 
   // Timer0 is used for micros(), millis(), delay(), etc and can't be used
   // Select Timer 1-2 for UNO, 0-5 for MEGA
@@ -101,9 +120,11 @@ void setup()
   // For 8-bit timer 2 (prescaler up to 1024, set frequency from 61.5Hz to some KHz
 
   if (ITimer1.attachInterruptInterval(TIMER1_INTERVAL_MS, TimerHandler1, (unsigned int) &myOutputPins))
-    Serial.println("Starting  ITimer1 OK, millis() = " + String(millis()));
+  {
+    Serial.print(F("Starting  ITimer1 OK, millis() = ")); Serial.println(millis());
+  }
   else
-    Serial.println("Can't set ITimer1. Select another freq. or timer");
+    Serial.println(F("Can't set ITimer1. Select another freq. or timer"));
 }
 
 void loop()

examples/Argument_Complex/Argument_Complex.ino

@@ -22,7 +22,7 @@
   If your data is multiple variables, such as an array and a count, usually interrupts need to be disabled
   or the entire sequence of your code which accesses the data.
   
-  Version: 1.1.0
+  Version: 1.1.2
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -31,8 +31,21 @@
   1.0.2   K.Hoang      28/11/2019 Permit up to 16 super-long-time, super-accurate ISR-based timers to avoid being blocked
   1.0.3   K.Hoang      01/12/2020 Add complex examples ISR_16_Timers_Array_Complex and ISR_16_Timers_Array_Complex
   1.1.1   K.Hoang      06/12/2020 Add example Change_Interval. Bump up version to sync with other TimerInterrupt Libraries
+  1.1.2   K.Hoang      05/01/2021 Fix warnings. Optimize examples to reduce memory usage
  *****************************************************************************************************************************/
-//These define's must be placed at the beginning before #include "TimerInterrupt.h"
+
+#if defined(__AVR_ATmega8__) || defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) || \
+    defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega644__) || defined(__AVR_ATmega644A__) || \
+    defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__) || defined(ARDUINO_AVR_UNO) || defined(ARDUINO_AVR_NANO) || \
+    defined(ARDUINO_AVR_MINI) || defined(ARDUINO_AVR_ETHERNET) || defined(ARDUINO_AVR_FIO) || defined(ARDUINO_AVR_BT) || \
+    defined(ARDUINO_AVR_LILYPAD) || defined(ARDUINO_AVR_PRO) || defined(ARDUINO_AVR_NG) || defined(ARDUINO_AVR_UNO_WIFI_DEV_ED)
+
+#else
+  #error This is designed only for Arduino AVR board! Please check your Tools->Board setting.
+#endif
+
+// These define's must be placed at the beginning before #include "TimerInterrupt.h"
+// Don't define TIMER_INTERRUPT_DEBUG > 0. Only for special ISR debugging only. Can hang the system.
 #define TIMER_INTERRUPT_DEBUG      0
 
 #define USE_TIMER_1     true
@@ -84,9 +97,9 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println("\nStarting Argument_None");
+  Serial.println(F("\nStarting Argument_None on AVR"));
   Serial.println(TIMER_INTERRUPT_VERSION);
-  Serial.println("CPU Frequency = " + String(F_CPU / 1000000) + " MHz");
+  Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
 
   // Select Timer 1-2 for UNO, 0-5 for MEGA
   // Timer 2 is 8-bit timer, only for higher frequency
@@ -97,18 +110,22 @@ void setup()
   // For 8-bit timer 2 (prescaler up to 1024, set frequency from 61.5Hz to some KHz
 
   if (ITimer1.attachInterruptInterval(TIMER1_INTERVAL_MS, TimerHandler1))
-    Serial.println("Starting  ITimer1 OK, millis() = " + String(millis()));
+  {
+    Serial.print(F("Starting  ITimer1 OK, millis() = ")); Serial.println(millis());
+  }
   else
-    Serial.println("Can't set ITimer1. Select another freq. or timer");
+    Serial.println(F("Can't set ITimer1. Select another freq. or timer"));
 
   // Select Timer 1-2 for UNO, 0-5 for MEGA
   // Timer 2 is 8-bit timer, only for higher frequency
   ITimer2.init();
 
   if (ITimer2.attachInterruptInterval(TIMER2_INTERVAL_MS, TimerHandler2))
-    Serial.println("Starting  ITimer2 OK, millis() = " + String(millis()));
+  {
+    Serial.print(F("Starting  ITimer2 OK, millis() = ")); Serial.println(millis());
+  }
   else
-    Serial.println("Can't set ITimer2. Select another freq. or timer");
+    Serial.println(F("Can't set ITimer2. Select another freq. or timer"));
 }
 
 void loop()

examples/Argument_None/Argument_None.ino

@@ -22,7 +22,7 @@
   If your data is multiple variables, such as an array and a count, usually interrupts need to be disabled
   or the entire sequence of your code which accesses the data.
   
-  Version: 1.1.0
+  Version: 1.1.2
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -31,8 +31,21 @@
   1.0.2   K.Hoang      28/11/2019 Permit up to 16 super-long-time, super-accurate ISR-based timers to avoid being blocked
   1.0.3   K.Hoang      01/12/2020 Add complex examples ISR_16_Timers_Array_Complex and ISR_16_Timers_Array_Complex
   1.1.1   K.Hoang      06/12/2020 Add example Change_Interval. Bump up version to sync with other TimerInterrupt Libraries
+  1.1.2   K.Hoang      05/01/2021 Fix warnings. Optimize examples to reduce memory usage
  *****************************************************************************************************************************/
-//These define's must be placed at the beginning before #include "TimerInterrupt.h"
+
+#if defined(__AVR_ATmega8__) || defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) || \
+    defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega644__) || defined(__AVR_ATmega644A__) || \
+    defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__) || defined(ARDUINO_AVR_UNO) || defined(ARDUINO_AVR_NANO) || \
+    defined(ARDUINO_AVR_MINI) || defined(ARDUINO_AVR_ETHERNET) || defined(ARDUINO_AVR_FIO) || defined(ARDUINO_AVR_BT) || \
+    defined(ARDUINO_AVR_LILYPAD) || defined(ARDUINO_AVR_PRO) || defined(ARDUINO_AVR_NG) || defined(ARDUINO_AVR_UNO_WIFI_DEV_ED)
+
+#else
+  #error This is designed only for Arduino AVR board! Please check your Tools->Board setting.
+#endif
+
+// These define's must be placed at the beginning before #include "TimerInterrupt.h"
+// Don't define TIMER_INTERRUPT_DEBUG > 0. Only for special ISR debugging only. Can hang the system.
 #define TIMER_INTERRUPT_DEBUG      0
 
 #define USE_TIMER_1     true
@@ -57,8 +70,12 @@ void TimerHandler1(unsigned int outputPin = LED_BUILTIN)
     pinMode(outputPin, OUTPUT);
   }
 
+#if (TIMER_INTERRUPT_DEBUG > 1)
   //timer interrupt toggles pin outputPin, default LED_BUILTIN
-  Serial.println("pin1 = " + String(outputPin) + " address: " + String((uint32_t) &outputPin) );
+  Serial.print("pin1 = "); Serial.print(outputPin);
+  Serial.print(" address: "); Serial.println((uint32_t) &outputPin );
+#endif
+  
   digitalWrite(outputPin, toggle1);
   toggle1 = !toggle1;
 }
@@ -88,9 +105,9 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println("\nStarting Argument_Simple");
+  Serial.println(F("\nStarting Argument_Simple on AVR"));
   Serial.println(TIMER_INTERRUPT_VERSION);
-  Serial.println("CPU Frequency = " + String(F_CPU / 1000000) + " MHz");
+  Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
 
   // Timer0 is used for micros(), millis(), delay(), etc and can't be used
   // Select Timer 1-2 for UNO, 0-5 for MEGA
@@ -104,18 +121,29 @@ void setup()
 
   if (ITimer1.attachInterruptInterval(TIMER1_INTERVAL_MS, TimerHandler1, outputPin1))
   {
-    Serial.println("Starting  ITimer1 OK, millis() = " + String(millis()));
-    Serial.println("OutputPin1 = " + String(outputPin1) + ", address = " + String((uint32_t) &outputPin1) );
+    Serial.print(F("Starting  ITimer1 OK, millis() = ")); Serial.println(millis());
+
+#if (TIMER_INTERRUPT_DEBUG > 1)    
+    Serial.print(F("OutputPin1 = ")); Serial.print(outputPin1);
+    Serial.print(F(" address: ")); Serial.println((uint32_t) &outputPin1 );
+#endif    
   }
   else
-    Serial.println("Can't set ITimer1. Select another freq. or timer");
+    Serial.println(F("Can't set ITimer1. Select another freq. or timer"));
 
   ITimer2.init();
 
   if (ITimer2.attachInterruptInterval(TIMER2_INTERVAL_MS, TimerHandler2, outputPin2))
-    Serial.println("Starting  ITimer2 OK, millis() = " + String(millis()));
+  {
+    Serial.print(F("Starting  ITimer1 OK, millis() = ")); Serial.println(millis());
+    
+#if (TIMER_INTERRUPT_DEBUG > 1)    
+    Serial.print(F("OutputPin2 = ")); Serial.print(outputPin2);
+    Serial.print(F(" address: ")); Serial.println((uint32_t) &outputPin2 );
+#endif    
+  }
   else
-    Serial.println("Can't set ITimer2. Select another freq. or timer");
+    Serial.println(F("Can't set ITimer2. Select another freq. or timer"));
 }
 
 void loop()

examples/Argument_Simple/Argument_Simple.ino

@@ -22,7 +22,7 @@
   If your data is multiple variables, such as an array and a count, usually interrupts need to be disabled
   or the entire sequence of your code which accesses the data.
   
-  Version: 1.1.0
+  Version: 1.1.2
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -31,6 +31,7 @@
   1.0.2   K.Hoang      28/11/2019 Permit up to 16 super-long-time, super-accurate ISR-based timers to avoid being blocked
   1.0.3   K.Hoang      01/12/2020 Add complex examples ISR_16_Timers_Array_Complex and ISR_16_Timers_Array_Complex
   1.1.1   K.Hoang      06/12/2020 Add example Change_Interval. Bump up version to sync with other TimerInterrupt Libraries
+  1.1.2   K.Hoang      05/01/2021 Fix warnings. Optimize examples to reduce memory usage
 *****************************************************************************************************************************/
 
 /*
@@ -45,7 +46,18 @@
    or the entire sequence of your code which accesses the data.
 */
 
-//These define's must be placed at the beginning before #include "TimerInterrupt.h"
+#if defined(__AVR_ATmega8__) || defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) || \
+    defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega644__) || defined(__AVR_ATmega644A__) || \
+    defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__) || defined(ARDUINO_AVR_UNO) || defined(ARDUINO_AVR_NANO) || \
+    defined(ARDUINO_AVR_MINI) || defined(ARDUINO_AVR_ETHERNET) || defined(ARDUINO_AVR_FIO) || defined(ARDUINO_AVR_BT) || \
+    defined(ARDUINO_AVR_LILYPAD) || defined(ARDUINO_AVR_PRO) || defined(ARDUINO_AVR_NG) || defined(ARDUINO_AVR_UNO_WIFI_DEV_ED)
+
+#else
+  #error This is designed only for Arduino AVR board! Please check your Tools->Board setting.
+#endif
+
+// These define's must be placed at the beginning before #include "TimerInterrupt.h"
+// Don't define TIMER_INTERRUPT_DEBUG > 0. Only for special ISR debugging only. Can hang the system.
 #define TIMER_INTERRUPT_DEBUG      0
 
 #define USE_TIMER_1     true
@@ -73,7 +85,9 @@ volatile uint32_t Timer2Count = 0;
 
 void printResult(uint32_t currTime)
 {
-  Serial.println("Time = " + String(currTime) + ", Timer1Count = " + String(Timer1Count) + ", Timer2Count = " + String(Timer2Count));
+  Serial.print(F("Time = ")); Serial.print(currTime); 
+  Serial.print(F(", Timer1Count = ")); Serial.print(Timer1Count);
+  Serial.print(F(", Timer2Count = ")); Serial.println(Timer2Count);
 }
 
 void TimerHandler1(void)
@@ -108,9 +122,9 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println("\nStarting Change_Interval on AVR");
+  Serial.println(F("\nStarting Change_Interval on AVR"));
   Serial.println(TIMER_INTERRUPT_VERSION);
-  Serial.println("CPU Frequency = " + String(F_CPU / 1000000) + " MHz");
+  Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
 
 
   // Select Timer 1-2 for UNO, 0-5 for MEGA
@@ -122,18 +136,22 @@ void setup()
   // For 8-bit timer 2 (prescaler up to 1024, set frequency from 61.5Hz to some KHz
 
   if (ITimer1.attachInterruptInterval(TIMER1_INTERVAL_MS, TimerHandler1))
-    Serial.println("Starting  ITimer1 OK, millis() = " + String(millis()));
+  {
+    Serial.print(F("Starting  ITimer1 OK, millis() = ")); Serial.println(millis());
+  }
   else
-    Serial.println("Can't set ITimer1. Select another freq. or timer");
+    Serial.println(F("Can't set ITimer1. Select another freq. or timer"));
 
   // Select Timer 1-2 for UNO, 0-5 for MEGA
   // Timer 2 is 8-bit timer, only for higher frequency
   ITimer2.init();
 
   if (ITimer2.attachInterruptInterval(TIMER2_INTERVAL_MS, TimerHandler2))
-    Serial.println("Starting  ITimer2 OK, millis() = " + String(millis()));
+  {
+    Serial.print(F("Starting  ITimer2 OK, millis() = ")); Serial.println(millis());
+  }
   else
-    Serial.println("Can't set ITimer2. Select another freq. or timer");
+    Serial.println(F("Can't set ITimer2. Select another freq. or timer"));
 }
 
 #define CHECK_INTERVAL_MS     10000L
@@ -164,8 +182,8 @@ void loop()
       ITimer1.setInterval(TIMER1_INTERVAL_MS * (multFactor + 1), TimerHandler1);
       ITimer2.setInterval(TIMER2_INTERVAL_MS * (multFactor + 1), TimerHandler2);
 
-      Serial.println("Changing Interval, Timer1 = " + String(TIMER1_INTERVAL_MS * (multFactor + 1)) + 
-                                     ",  Timer2 = " + String(TIMER2_INTERVAL_MS * (multFactor + 1)));
+      Serial.print(F("Changing Interval, Timer1 = ")); Serial.print(TIMER1_INTERVAL_MS * (multFactor + 1));
+      Serial.print(F(",  Timer2 = ")); Serial.println(TIMER2_INTERVAL_MS * (multFactor + 1));                         
 
       lastChangeTime = currTime;
     }