v1.1.1

### Releases v1.1.1

1. Add [**Change_Interval**](examples/Change_Interval) example to show how to change TimerInterval on-the-fly
2. Add Version String

Author: khoih-prog

README.md

@@ -42,6 +42,11 @@ The catch is **your function is now part of an ISR (Interrupt Service Routine),
 ---
 ---
 
+### Releases v1.1.1
+
+1. Add [**Change_Interval**](examples/Change_Interval) example to show how to change TimerInterval on-the-fly
+2. Add Version String
+
 ### Releases v1.1.0
 
 1. Restore cpp code besides Impl.h code to use if Multiple-Definition linker error.
@@ -64,7 +69,7 @@ The catch is **your function is now part of an ISR (Interrupt Service Routine),
 ---
 ---
 
-## Prerequisite
+## Prerequisites
 
 1. [`Arduino IDE 1.8.13+`](https://www.arduino.cc/en/Main/Software)
 2. [`ESP8266 core 2.7.4+`](https://github.com/esp8266/Arduino#installing-with-boards-manager) for ESP8266 boards.
@@ -92,7 +97,7 @@ Another way to install is to:
 
 1. Install [VS Code](https://code.visualstudio.com/)
 2. Install [PlatformIO](https://platformio.org/platformio-ide)
-3. Install [**ESP8266TimerInterrupt** library](https://platformio.org/lib/show/6901/ESP8266TimerInterrupt) by using [Library Manager](https://platformio.org/lib/show/6901/ESP8266TimerInterrupt/installation). Search for **ESP8266TimerInterrupt** in [Platform.io Author's Libraries](https://platformio.org/lib/search?query=author:%22Khoi%20Hoang%22)
+3. Install [**ESP8266TimerInterrupt** library](https://platformio.org/lib/show/11385/ESP8266TimerInterrupt) or [**ESP8266TimerInterrupt** library](https://platformio.org/lib/show/6901/ESP8266TimerInterrupt) by using [Library Manager](https://platformio.org/lib/show/11385/ESP8266TimerInterrupt/installation). Search for **ESP8266TimerInterrupt** in [Platform.io Author's Libraries](https://platformio.org/lib/search?query=author:%22Khoi%20Hoang%22)
 4. Use included [platformio.ini](platformio/platformio.ini) file from examples to ensure that all dependent libraries will installed automatically. Please visit documentation for the other options and examples at [Project Configuration File](https://docs.platformio.org/page/projectconf.html)
 
 ---
@@ -188,6 +193,7 @@ Please have a look at [ESP8266TimerInterrupt Issue 8: **ESP8266Timer and PWM -->
  8. [RPM_Measure](examples/RPM_Measure)
  9. [SwitchDebounce](examples/SwitchDebounce)
 10. [TimerInterruptTest](examples/TimerInterruptTest)
+11. [**Change_Interval**](examples/Change_Interval). New.
 
 ---
 ---
@@ -333,6 +339,7 @@ void setup()
   delay(200);
 
   Serial.println("\nStarting ISR_Timer_Complex on " + String(ARDUINO_BOARD));
+  Serial.println(ESP8266_TIMER_INTERRUPT_VERSION);
   Serial.println("CPU Frequency = " + String(F_CPU / 1000000) + " MHz");
 
   // Interval in microsecs
@@ -405,6 +412,7 @@ While software timer, **programmed for 2s, is activated after 4.258s !!!**
 
 ```
 Starting ISR_Timer_Complex on ESP8266_NODEMCU
+ESP8266TimerInterrupt v1.1.1
 CPU Frequency = 160 MHz
 ESP8266TimerInterrupt: _fre = 312500.00, _count = 15625
 Starting  ITimer OK, millis() = 64
@@ -450,6 +458,7 @@ doingSomething10s: Delta ms = 10000
 
 ```
 Starting TimerInterruptTest on ESP8266_NODEMCU
+ESP8266TimerInterrupt v1.1.1
 CPU Frequency = 160 MHz
 ESP8266TimerInterrupt: _fre = 312500.00, _count = 312500
 Starting  ITimer OK, millis() = 262
@@ -473,9 +482,51 @@ Delta ms = 1000
 
 ```
 
+---
+
+3. The following is the sample terminal output when running example [Change_Interval](examples/Change_Interval) to demonstrate how to change Timer Interval on-the-fly
+
+```
+Starting Change_Interval on ESP8266_NODEMCU
+ESP8266TimerInterrupt v1.1.1
+CPU Frequency = 160 MHz
+Starting  ITimer OK, millis() = 162
+Time = 10001, TimerCount = 19
+Time = 20002, TimerCount = 39
+Changing Interval, Timer = 1000
+Time = 30003, TimerCount = 49
+Time = 40004, TimerCount = 59
+Changing Interval, Timer = 500
+Time = 50005, TimerCount = 79
+Time = 60006, TimerCount = 99
+Changing Interval, Timer = 1000
+Time = 70007, TimerCount = 109
+Time = 80008, TimerCount = 119
+Changing Interval, Timer = 500
+Time = 90009, TimerCount = 139
+Time = 100010, TimerCount = 159
+Changing Interval, Timer = 1000
+Time = 110011, TimerCount = 169
+Time = 120012, TimerCount = 179
+Changing Interval, Timer = 500
+Time = 130013, TimerCount = 199
+Time = 140014, TimerCount = 219
+Changing Interval, Timer = 1000
+Time = 150015, TimerCount = 229
+Time = 160016, TimerCount = 239
+Changing Interval, Timer = 500
+Time = 170017, TimerCount = 259
+Time = 180018, TimerCount = 279
+```
+
 ---
 ---
 
+### Releases v1.1.1
+
+1. Add [**Change_Interval**](examples/Change_Interval) example to show how to change TimerInterval on-the-fly
+2. Add Version String
+
 ### Releases v1.1.0
 
 1. Restore cpp code besides Impl.h code to use if Multiple-Definition linker error.

examples/Argument_None/Argument_None.ino

@@ -23,7 +23,7 @@
    Based on BlynkTimer.h
    Author: Volodymyr Shymanskyy
   
-   Version: 1.1.0
+   Version: 1.1.1
    
    Version Modified By   Date      Comments
    ------- -----------  ---------- -----------
@@ -32,6 +32,7 @@
     1.0.2   K.Hoang      26/11/2019 Permit up to 16 super-long-time, super-accurate ISR-based timers to avoid being blocked
     1.0.3   K.Hoang      17/05/2020 Restructure code. Fix example. Enhance README.
     1.1.0   K.Hoang      27/10/2020 Restore cpp code besides Impl.h code to use if Multiple-Definition linker error.
+    1.1.1   K.Hoang      06/12/2020 Add Version String and Change_Interval example to show how to change TimerInterval
 *****************************************************************************************************************************/
 
 /* Notes:
@@ -55,7 +56,7 @@
 #include "ESP8266TimerInterrupt.h"
 
 #ifndef LED_BUILTIN
-#define LED_BUILTIN       2         // Pin D4 mapped to pin GPIO2/TXD1 of ESP8266, NodeMCU and WeMoS, control on-board LED
+  #define LED_BUILTIN       2         // Pin D4 mapped to pin GPIO2/TXD1 of ESP8266, NodeMCU and WeMoS, control on-board LED
 #endif
 
 volatile uint32_t lastMillis = 0;
@@ -83,7 +84,7 @@ void ICACHE_RAM_ATTR TimerHandler(void)
 
 #define TIMER_INTERVAL_MS        1000
 
-// Init ESP32 timer 0
+// Init ESP8266Timer
 ESP8266Timer ITimer;
 
 
@@ -95,6 +96,7 @@ void setup()
   delay(200);
 
   Serial.println("\nStarting Argument_None on " + String(ARDUINO_BOARD));
+  Serial.println(ESP8266_TIMER_INTERRUPT_VERSION);
   Serial.println("CPU Frequency = " + String(F_CPU / 1000000) + " MHz");
 
   // Interval in microsecs

examples/Change_Interval/Change_Interval.ino

@@ -0,0 +1,168 @@
+/****************************************************************************************************************************
+   Change_Interval.ino
+   For NRF52 boards using mbed-RTOS such as Nano-33-BLE
+   Written by Khoi Hoang
+
+   Built by Khoi Hoang https://github.com/khoih-prog/NRF52_MBED_TimerInterrupt
+   Licensed under MIT license
+
+   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 NRF52 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: 1.0.2
+
+   Version Modified By   Date      Comments
+   ------- -----------  ---------- -----------
+   1.0.1   K Hoang      22/11/2020 Initial coding and sync with NRF52_TimerInterrupt
+   1.0.2   K Hoang      23/11/2020 Add and optimize examples
+*****************************************************************************************************************************/
+
+/*
+   Notes:
+   Special design is necessary to share data between interrupt code and the rest of your program.
+   Variables usually need to be "volatile" types. Volatile tells the compiler to avoid optimizations that assume
+   variable can not spontaneously change. Because your function may change variables while your program is using them,
+   the compiler needs this hint. But volatile alone is often not enough.
+   When accessing shared variables, usually interrupts must be disabled. Even with volatile,
+   if the interrupt changes a multi-byte variable between a sequence of instructions, it can be read incorrectly.
+   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.
+*/
+
+#if !( ARDUINO_ARCH_NRF52840 && TARGET_NAME == ARDUINO_NANO33BLE )
+  #error This code is designed to run on nRF52-based Nano-33-BLE boards using mbed-RTOS platform! Please check your Tools->Board setting.
+#endif
+
+// These define's must be placed at the beginning before #include "NRF52TimerInterrupt.h"
+// For Nano33-BLE, don't use Serial.print() in ISR as system will definitely hang.
+#define NRF52_MBED_TIMER_INTERRUPT_DEBUG      0
+
+#include "NRF52_MBED_TimerInterrupt.h"
+
+//#ifndef LED_BUILTIN
+//  #define LED_BUILTIN         D13
+//#endif
+
+#ifndef LED_BLUE_PIN
+  #define LED_BLUE_PIN          D7
+#endif
+
+#ifndef LED_RED_PIN
+  #define LED_RED_PIN           D8
+#endif
+
+#define TIMER0_INTERVAL_MS        500   //1000
+#define TIMER1_INTERVAL_MS        2000
+
+volatile uint32_t Timer0Count = 0;
+volatile uint32_t Timer1Count = 0;
+
+// Depending on the board, you can select NRF52 Hardware Timer from NRF_TIMER_1,NRF_TIMER_3,NRF_TIMER_4 (1,3 and 4)
+// If you select the already-used NRF_TIMER_0 or NRF_TIMER_2, it'll be auto modified to use NRF_TIMER_1
+
+// Init NRF52 timer NRF_TIMER1
+NRF52_MBED_Timer ITimer0(NRF_TIMER_4);
+
+// Init NRF52 timer NRF_TIMER3
+NRF52_MBED_Timer ITimer1(NRF_TIMER_3);
+
+void printResult(uint32_t currTime)
+{
+  Serial.printf("Time = %ld, Timer0Count = %lu, , Timer1Count = %lu\n", currTime, Timer0Count, Timer1Count);
+}
+
+void TimerHandler0(void)
+{
+  static bool toggle0 = false;
+
+  // Flag for checking to be sure ISR is working as SErial.print is not OK here in ISR
+  Timer0Count++;
+
+  //timer interrupt toggles pin LED_BUILTIN
+  digitalWrite(LED_BUILTIN, toggle0);
+  toggle0 = !toggle0;
+}
+
+void TimerHandler1(void)
+{
+  static bool toggle1 = false;
+
+  // Flag for checking to be sure ISR is working as Serial.print is not OK here in ISR
+  Timer1Count++;
+  
+  //timer interrupt toggles outputPin
+  digitalWrite(LED_BLUE_PIN, toggle1);
+  toggle1 = !toggle1;
+}
+
+void setup()
+{
+  pinMode(LED_BUILTIN, OUTPUT);
+  pinMode(LED_BLUE_PIN, OUTPUT);
+  
+  Serial.begin(115200);
+  while (!Serial);
+
+  delay(100);
+
+  Serial.printf("\nStarting Change_Interval on %s\n", BOARD_NAME);
+  Serial.printf("Version : v%s\n", NRF52_MBED_TIMER_INTERRUPT_VERSION);
+ 
+  // Interval in microsecs
+  if (ITimer0.attachInterruptInterval(TIMER0_INTERVAL_MS * 1000, TimerHandler0))
+  {
+    Serial.printf("Starting  ITimer0 OK, millis() = %ld\n", millis());
+  }
+  else
+    Serial.println("Can't set ITimer0. Select another freq. or timer");
+
+  // Interval in microsecs
+  if (ITimer1.attachInterruptInterval(TIMER1_INTERVAL_MS * 1000, TimerHandler1))
+  {
+    Serial.printf("Starting  ITimer1 OK, millis() = %ld\n", millis());
+  }
+  else
+    Serial.println("Can't set ITimer1. Select another freq. or timer");
+}
+
+#define CHECK_INTERVAL_MS     10000L
+#define CHANGE_INTERVAL_MS    20000L
+
+void loop()
+{
+  static uint32_t lastTime = 0;
+  static uint32_t lastChangeTime = 0;
+  static uint32_t currTime;
+  static uint32_t multFactor = 0;
+
+  currTime = millis();
+
+  if (currTime - lastTime > CHECK_INTERVAL_MS)
+  {
+    printResult(currTime);
+    lastTime = currTime;
+
+    if (currTime - lastChangeTime > CHANGE_INTERVAL_MS)
+    {
+      //setInterval(unsigned long interval, timerCallback callback)
+      multFactor = (multFactor + 1) % 2;
+      
+      ITimer0.setInterval(TIMER0_INTERVAL_MS * 1000 * (multFactor + 1), TimerHandler0);
+      ITimer1.setInterval(TIMER1_INTERVAL_MS * 1000 * (multFactor + 1), TimerHandler1);
+
+      Serial.printf("Changing Interval, Timer0 = %lu,  Timer1 = %lu\n", TIMER0_INTERVAL_MS * (multFactor + 1), TIMER1_INTERVAL_MS * (multFactor + 1));
+      
+      lastChangeTime = currTime;
+    }
+  }
+}

examples/ISR_RPM_Measure/ISR_RPM_Measure.ino

@@ -23,7 +23,7 @@
    Based on BlynkTimer.h
    Author: Volodymyr Shymanskyy
   
-   Version: 1.1.0
+   Version: 1.1.1
    
    Version Modified By   Date      Comments
    ------- -----------  ---------- -----------
@@ -32,6 +32,7 @@
     1.0.2   K.Hoang      26/11/2019 Permit up to 16 super-long-time, super-accurate ISR-based timers to avoid being blocked
     1.0.3   K.Hoang      17/05/2020 Restructure code. Fix example. Enhance README.
     1.1.0   K.Hoang      27/10/2020 Restore cpp code besides Impl.h code to use if Multiple-Definition linker error.
+    1.1.1   K.Hoang      06/12/2020 Add Version String and Change_Interval example to show how to change TimerInterval
 *****************************************************************************************************************************/
 
 /* Notes:
@@ -143,6 +144,7 @@ void setup()
   delay(200);
 
   Serial.println("\nStarting ISR_RPM_Measure on " + String(ARDUINO_BOARD));
+  Serial.println(ESP8266_TIMER_INTERRUPT_VERSION);
   Serial.println("CPU Frequency = " + String(F_CPU / 1000000) + " MHz");
 
   // Interval in microsecs

examples/ISR_Switch/ISR_Switch.ino

@@ -23,7 +23,7 @@
    Based on BlynkTimer.h
    Author: Volodymyr Shymanskyy
   
-   Version: 1.1.0
+   Version: 1.1.1
    
    Version Modified By   Date      Comments
    ------- -----------  ---------- -----------
@@ -32,6 +32,7 @@
     1.0.2   K.Hoang      26/11/2019 Permit up to 16 super-long-time, super-accurate ISR-based timers to avoid being blocked
     1.0.3   K.Hoang      17/05/2020 Restructure code. Fix example. Enhance README.
     1.1.0   K.Hoang      27/10/2020 Restore cpp code besides Impl.h code to use if Multiple-Definition linker error.
+    1.1.1   K.Hoang      06/12/2020 Add Version String and Change_Interval example to show how to change TimerInterval
 *****************************************************************************************************************************/
 /* Notes:
    Special design is necessary to share data between interrupt code and the rest of your program.
@@ -87,9 +88,11 @@ char auth[]     = "****";
 char ssid[]     = "****";
 char pass[]     = "****";
 
-// These define's must be placed at the beginning before #include "ESP8266TimerInterrupt.h"
-// Don't define TIMER_INTERRUPT_DEBUG > 2. Only for special ISR debugging only. Can hang the system.
-#define TIMER_INTERRUPT_DEBUG       1
+//These define's must be placed at the beginning before #include "ESP8266TimerInterrupt.h"
+// Don't define TIMER_INTERRUPT_DEBUG > 0. Only for special ISR debugging only. Can hang the system.
+#define TIMER_INTERRUPT_DEBUG      0
+
+#include "ESP8266TimerInterrupt.h"
 
 #define DEBOUNCE_TIME               25
 #define LONG_BUTTON_PRESS_TIME_MS   100
@@ -252,6 +255,7 @@ void setup()
   delay(200);
 
   Serial.println("\nStarting ISR_Switch on " + String(ARDUINO_BOARD));
+  Serial.println(ESP8266_TIMER_INTERRUPT_VERSION);
   Serial.println("CPU Frequency = " + String(F_CPU / 1000000) + " MHz");
 
   LampState = false;