v1.4.1

### Releases v1.4.1 1. Add support to **Generic or Sparkfun AVR ATmega_32U4** such as **AVR_MAKEYMAKEY, AVR_PROMICRO, etc.** 2. Add support to **Generic or Sparkfun AVR ATmega_328(P)** such as **ARDUINO_REDBOT, ARDUINO_AVR_DIGITAL_SANDBOX, etc.** 3. Add support to **Generic or Sparkfun AVR ATmega128RFA1** such as **ATMEGA128RFA1_DEV_BOARD, etc.**
khoih-prog · Apr 3, 2021 · af53e3e · af53e3e
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diff --git a/README.md b/README.md
@@ -13,9 +13,10 @@
 * [Why do we need this TimerInterrupt library](#why-do-we-need-this-timerinterrupt-library)
   * [Features](#features)
   * [Why using ISR-based Hardware Timer Interrupt is better](#why-using-isr-based-hardware-timer-interrupt-is-better)
-  * [Currently supported Boards](#currently-supported-boards)
   * [Important Notes about ISR](#important-notes-about-isr)
+  * [Currently supported Boards](#currently-supported-boards)
 * [Changelog](#changelog)
+  * [Releases v1.4.1](#releases-v141)
   * [Releases v1.4.0](#releases-v140)
   * [Releases v1.3.0](#releases-v130)
   * [Releases v1.2.0](#releases-v120)
@@ -130,12 +131,21 @@ The catch is your function is now part of an ISR (Interrupt Service Routine), an
 - **Arduino ATMega 16U4, 32U4** such as AVR Leonardo, Leonardo ETH, YUN, Esplora, LILYPAD_USB, AVR_ROBOT_CONTROL, AVR_ROBOT_MOTOR, AVR_INDUSTRIAL101, etc.
 - **Adafruit ATMega 32U4** such as AVR_FLORA8, AVR_FEATHER32U4, AVR_CIRCUITPLAY, AVR_ITSYBITSY32U4_5V, AVR_ITSYBITSY32U4_3V, AVR_BLUEFRUITMICRO, AVR_ADAFRUIT32U4, etc.
 - **Adafruit ATMega 328(P)** such as AVR_METRO, AVR_FEATHER328P, AVR_PROTRINKET5, AVR_PROTRINKET3, AVR_PROTRINKET5FTDI, AVR_PROTRINKET3FTDI, etc.
+- **Generic or Sparkfun AVR ATmega_32U4** such as **AVR_MAKEYMAKEY, AVR_PROMICRO, etc.**
+- **Generic or Sparkfun AVR ATmega_328(P)** such as **ARDUINO_REDBOT, ARDUINO_AVR_DIGITAL_SANDBOX, etc.**
+- **Generic or Sparkfun AVR ATmega128RFA1** such as **ATMEGA128RFA1_DEV_BOARD, etc.**
 
 ---
 ---
 
 ## Changelog
 
+### Releases v1.4.1
+
+1. Add support to **Generic or Sparkfun AVR ATmega_32U4** such as **AVR_MAKEYMAKEY, AVR_PROMICRO, etc.**
+2. Add support to **Generic or Sparkfun AVR ATmega_328(P)** such as **ARDUINO_REDBOT, ARDUINO_AVR_DIGITAL_SANDBOX, etc.**
+3. Add support to **Generic or Sparkfun AVR ATmega128RFA1** such as **ATMEGA128RFA1_DEV_BOARD, etc.**
+
 ### Releases v1.4.0
 
 1. Add support to **Adafruit AVR ATMEGA_32U4** such as **AVR_FLORA8, AVR_FEATHER32U4, etc.**
@@ -182,6 +192,7 @@ The catch is your function is now part of an ISR (Interrupt Service Routine), an
 1. [`Arduino IDE 1.8.13+` for Arduino](https://www.arduino.cc/en/Main/Software)
 2. [`Arduino AVR core 1.8.3+`](https://github.com/arduino/ArduinoCore-avr) for Arduino AVR boards. Use Arduino Board Manager to install. [![Latest release](https://img.shields.io/github/release/arduino/ArduinoCore-avr.svg)](https://github.com/arduino/ArduinoCore-avr/releases/latest/)
 3. [`Adafruit AVR core 1.4.13+`](https://github.com/adafruit/Adafruit_Arduino_Boards) for Adafruit AVR boards. Use Arduino Board Manager to install. 
+4. [`Sparkfun AVR core 1.1.13+`](https://github.com/sparkfun/Arduino_Boards) for Sparkfun AVR boards. Use Arduino Board Manager to install. 
 
 ---
 ---
@@ -812,8 +823,8 @@ The following is the sample terminal output when running example [ISR_16_Timers_
 While software timer, **programmed for 2s, is activated after more than 10.000s in loop().
 
 ```
-Starting ISR_16_Timers_Array_Complex on AVR
-TimerInterrupt v1.4.0
+Starting ISR_16_Timers_Array_Complex on Arduino AVR
+TimerInterrupt v1.4.1
 CPU Frequency = 16 MHz
 Starting  ITimer2 OK, millis() = 1
 SimpleTimer : 2, ms : 10007, Dms : 10007
@@ -962,8 +973,8 @@ Timer : 15, programmed : 80000, actual : 80010
 The following is the sample terminal output when running example [Change_Interval](examples/Change_Interval) on **AVR Mega2560** to demonstrate how to change Timer Interval on-the-fly
 
 ```
-Starting Change_Interval on AVR
-TimerInterrupt v1.4.0
+Starting Change_Interval on Arduino AVR
+TimerInterrupt v1.4.1
 CPU Frequency = 16 MHz
 Starting  ITimer1 OK, millis() = 1
 Starting  ITimer2 OK, millis() = 4
@@ -1013,6 +1024,13 @@ Sometimes, the library will only work if you update the board core to the latest
 
 ## Releases
 
+### Releases v1.4.1
+
+1. Add support to **Generic or Sparkfun AVR ATmega_32U4** such as **AVR_MAKEYMAKEY, AVR_PROMICRO, etc.**
+2. Add support to **Generic or Sparkfun AVR ATmega_328(P)** such as **ARDUINO_REDBOT, ARDUINO_AVR_DIGITAL_SANDBOX, etc.**
+3. Add support to **Generic or Sparkfun AVR ATmega128RFA1** such as **ATMEGA128RFA1_DEV_BOARD, etc.**
+
+
 ### Releases v1.4.0
 
 1. Add support to **Adafruit AVR ATMEGA_32U4** such as **AVR_FLORA8, AVR_FEATHER32U4, etc.**
@@ -1067,6 +1085,9 @@ in loop(), using delay() function as an example. The elapsed time then is very u
 - **Arduino ATMega 16U4, 32U4** such as AVR Leonardo, Leonardo ETH, YUN, Esplora, LILYPAD_USB, AVR_ROBOT_CONTROL, AVR_ROBOT_MOTOR, AVR_INDUSTRIAL101, etc.
 - **Adafruit ATMega 32U4** such as AVR_FLORA8, AVR_FEATHER32U4, AVR_CIRCUITPLAY, AVR_ITSYBITSY32U4_5V, AVR_ITSYBITSY32U4_3V, AVR_BLUEFRUITMICRO, AVR_ADAFRUIT32U4, etc.
 - **Adafruit ATMega 328(P)** such as AVR_METRO, AVR_FEATHER328P, AVR_PROTRINKET5, AVR_PROTRINKET3, AVR_PROTRINKET5FTDI, AVR_PROTRINKET3FTDI, etc.
+- **Generic or Sparkfun AVR ATmega_32U4** such as **AVR_MAKEYMAKEY, AVR_PROMICRO, etc.**
+- **Generic or Sparkfun AVR ATmega_328(P)** such as **ARDUINO_REDBOT, ARDUINO_AVR_DIGITAL_SANDBOX, etc.**
+- **Generic or Sparkfun AVR ATmega128RFA1** such as **ATMEGA128RFA1_DEV_BOARD, etc.**
 
 ---
 ---
@@ -1085,16 +1106,19 @@ Submit issues to: [TimerInterrupt issues](https://github.com/khoih-prog/TimerInt
 
 ### DONE
 
-1. Longer Interval for timers.
-2. Reduce code size if use less timers. Eliminate compiler warnings.
-3. Now supporting complex object pointer-type argument.
-3. 16 hardware-initiated software-enabled timers while using only 1 hardware timer.
-4. Fix some bugs in v1.0.0
-5. Add more examples.
-6. Similar library for ESP32, ESP8266, SAMD21/SAMD51, nRF52, Mbed-OS Nano-33-BLE, STM32
-7. Add support to **Arduino ATMega-16U4, ATMega-32U4**-based boards
-8. Add support to **Adafruit ATMega-32U4**-based boards
-9. Add support to **Adafruit ATMega-328(P)**-based boards
+ 1. Longer Interval for timers.
+ 2. Reduce code size if use less timers. Eliminate compiler warnings.
+ 3. Now supporting complex object pointer-type argument.
+ 3. 16 hardware-initiated software-enabled timers while using only 1 hardware timer.
+ 4. Fix some bugs in v1.0.0
+ 5. Add more examples.
+ 6. Similar library for ESP32, ESP8266, SAMD21/SAMD51, nRF52, Mbed-OS Nano-33-BLE, STM32
+ 7. Add support to **Arduino ATMega-16U4, ATMega-32U4**-based boards
+ 8. Add support to **Adafruit ATMega-32U4**-based boards
+ 9. Add support to **Adafruit ATMega-328(P)**-based boards
+10. Add support to **Generic or Sparkfun AVR ATmega_32U4** such as **AVR_MAKEYMAKEY, AVR_PROMICRO, etc.**
+11. Add support to **Generic or Sparkfun AVR ATmega_328(P)** such as **ARDUINO_REDBOT, ARDUINO_AVR_DIGITAL_SANDBOX, etc.**
+12. Add support to **Generic or Sparkfun AVR ATmega128RFA1** such as **ATMEGA128RFA1_DEV_BOARD, etc.**
 
 ---
 ---

diff --git a/examples/Argument_Complex/Argument_Complex.ino b/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: 1.4.0
+  Version: 1.4.1
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -35,6 +35,7 @@
   1.2.0   K.Hoang      07/01/2021 Add better debug feature. Optimize code and examples to reduce RAM usage
   1.3.0   K.Hoang      25/02/2021 Add support to AVR ATMEGA_32U4 such as Leonardo, YUN, ESPLORA, etc.
   1.4.0   K.Hoang      01/04/2021 Add support to Adafruit 32U4 and 328(P) such as FEATHER32U4, FEATHER328P, etc.
+  1.4.1   K.Hoang      02/04/2021 Add support to Sparkfun 32U4, 328(P), 128RFA1 such as AVR_PROMICRO, REDBOT, etc.
 *****************************************************************************************************************************/
 
 // These define's must be placed at the beginning before #include "TimerInterrupt.h"
@@ -104,7 +105,8 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println(F("\nStarting Argument_Complex on AVR"));
+  Serial.print(F("\nStarting Argument_Complex on "));
+  Serial.println(BOARD_TYPE);
   Serial.println(TIMER_INTERRUPT_VERSION);
   Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
 

diff --git a/examples/Argument_None/Argument_None.ino b/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: 1.4.0
+  Version: 1.4.1
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -35,6 +35,7 @@
   1.2.0   K.Hoang      07/01/2021 Add better debug feature. Optimize code and examples to reduce RAM usage
   1.3.0   K.Hoang      25/02/2021 Add support to AVR ATMEGA_32U4 such as Leonardo, YUN, ESPLORA, etc.
   1.4.0   K.Hoang      01/04/2021 Add support to Adafruit 32U4 and 328(P) such as FEATHER32U4, FEATHER328P, etc.
+  1.4.1   K.Hoang      02/04/2021 Add support to Sparkfun 32U4, 328(P), 128RFA1 such as AVR_PROMICRO, REDBOT, etc.
  *****************************************************************************************************************************/
 
 // These define's must be placed at the beginning before #include "TimerInterrupt.h"
@@ -99,7 +100,8 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println(F("\nStarting Argument_None on AVR"));
+  Serial.print(F("\nStarting Argument_None on "));
+  Serial.println(BOARD_TYPE);
   Serial.println(TIMER_INTERRUPT_VERSION);
   Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
 

diff --git a/examples/Argument_Simple/Argument_Simple.ino b/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: 1.4.0
+  Version: 1.4.1
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -35,6 +35,7 @@
   1.2.0   K.Hoang      07/01/2021 Add better debug feature. Optimize code and examples to reduce RAM usage
   1.3.0   K.Hoang      25/02/2021 Add support to AVR ATMEGA_32U4 such as Leonardo, YUN, ESPLORA, etc.
   1.4.0   K.Hoang      01/04/2021 Add support to Adafruit 32U4 and 328(P) such as FEATHER32U4, FEATHER328P, etc.
+  1.4.1   K.Hoang      02/04/2021 Add support to Sparkfun 32U4, 328(P), 128RFA1 such as AVR_PROMICRO, REDBOT, etc.
  *****************************************************************************************************************************/
 
 // These define's must be placed at the beginning before #include "TimerInterrupt.h"
@@ -107,7 +108,8 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println(F("\nStarting Argument_Simple on AVR"));
+  Serial.print(F("\nStarting Argument_Simple on "));
+  Serial.println(BOARD_TYPE);
   Serial.println(TIMER_INTERRUPT_VERSION);
   Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
 

diff --git a/examples/Change_Interval/Change_Interval.ino b/examples/Change_Interval/Change_Interval.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: 1.4.0
+  Version: 1.4.1
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -35,6 +35,7 @@
   1.2.0   K.Hoang      07/01/2021 Add better debug feature. Optimize code and examples to reduce RAM usage
   1.3.0   K.Hoang      25/02/2021 Add support to AVR ATMEGA_32U4 such as Leonardo, YUN, ESPLORA, etc.
   1.4.0   K.Hoang      01/04/2021 Add support to Adafruit 32U4 and 328(P) such as FEATHER32U4, FEATHER328P, etc.
+  1.4.1   K.Hoang      02/04/2021 Add support to Sparkfun 32U4, 328(P), 128RFA1 such as AVR_PROMICRO, REDBOT, etc.
 *****************************************************************************************************************************/
 
 /*
@@ -121,7 +122,8 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println(F("\nStarting Change_Interval on AVR"));
+  Serial.print(F("\nStarting Change_Interval on "));
+  Serial.println(BOARD_TYPE);
   Serial.println(TIMER_INTERRUPT_VERSION);
   Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
 

diff --git a/examples/FakeAnalogWrite/FakeAnalogWrite.ino b/examples/FakeAnalogWrite/FakeAnalogWrite.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: 1.4.0
+  Version: 1.4.1
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -35,6 +35,7 @@
   1.2.0   K.Hoang      07/01/2021 Add better debug feature. Optimize code and examples to reduce RAM usage
   1.3.0   K.Hoang      25/02/2021 Add support to AVR ATMEGA_32U4 such as Leonardo, YUN, ESPLORA, etc.
   1.4.0   K.Hoang      01/04/2021 Add support to Adafruit 32U4 and 328(P) such as FEATHER32U4, FEATHER328P, etc.
+  1.4.1   K.Hoang      02/04/2021 Add support to Sparkfun 32U4, 328(P), 128RFA1 such as AVR_PROMICRO, REDBOT, etc.
 *****************************************************************************************************************************/
 /*
    Notes:
@@ -202,7 +203,8 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println(F("\nStarting FakeAnalogWrite on AVR"));
+  Serial.print(F("\nStarting FakeAnalogWrite on "));
+  Serial.println(BOARD_TYPE);
   Serial.println(TIMER_INTERRUPT_VERSION);
   Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
 

diff --git a/examples/ISR_16_Timers_Array_Complex/ISR_16_Timers_Array_Complex.ino b/examples/ISR_16_Timers_Array_Complex/ISR_16_Timers_Array_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: 1.4.0
+  Version: 1.4.1
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -35,6 +35,7 @@
   1.2.0   K.Hoang      07/01/2021 Add better debug feature. Optimize code and examples to reduce RAM usage
   1.3.0   K.Hoang      25/02/2021 Add support to AVR ATMEGA_32U4 such as Leonardo, YUN, ESPLORA, etc.
   1.4.0   K.Hoang      01/04/2021 Add support to Adafruit 32U4 and 328(P) such as FEATHER32U4, FEATHER328P, etc.
+  1.4.1   K.Hoang      02/04/2021 Add support to Sparkfun 32U4, 328(P), 128RFA1 such as AVR_PROMICRO, REDBOT, etc.
 *****************************************************************************************************************************/
 
 // These define's must be placed at the beginning before #include "TimerInterrupt.h"
@@ -306,7 +307,8 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println(F("\nStarting ISR_16_Timers_Array_Complex on AVR"));
+  Serial.print(F("\nStarting ISR_16_Timers_Array_Complex on "));
+  Serial.println(BOARD_TYPE);
   Serial.println(TIMER_INTERRUPT_VERSION);
   Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
 

diff --git a/examples/ISR_RPM_Measure/ISR_RPM_Measure.ino b/examples/ISR_RPM_Measure/ISR_RPM_Measure.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: 1.4.0
+  Version: 1.4.1
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -35,6 +35,7 @@
   1.2.0   K.Hoang      07/01/2021 Add better debug feature. Optimize code and examples to reduce RAM usage
   1.3.0   K.Hoang      25/02/2021 Add support to AVR ATMEGA_32U4 such as Leonardo, YUN, ESPLORA, etc.
   1.4.0   K.Hoang      01/04/2021 Add support to Adafruit 32U4 and 328(P) such as FEATHER32U4, FEATHER328P, etc.
+  1.4.1   K.Hoang      02/04/2021 Add support to Sparkfun 32U4, 328(P), 128RFA1 such as AVR_PROMICRO, REDBOT, etc.
  *****************************************************************************************************************************/
 /* RPM Measuring uses high frequency hardware timer 1Hz == 1ms) to measure the time from of one rotation, in ms
    then convert to RPM. One rotation is detected by reading the state of a magnetic REED SW or IR LED Sensor
@@ -141,7 +142,8 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println(F("\nStarting ISR_RPM_Measure on AVR"));
+  Serial.print(F("\nStarting ISR_RPM_Measure on "));
+  Serial.println(BOARD_TYPE);
   Serial.println(TIMER_INTERRUPT_VERSION);
   Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
 

diff --git a/examples/ISR_Switch/ISR_Switch.ino b/examples/ISR_Switch/ISR_Switch.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: 1.4.0
+  Version: 1.4.1
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -35,6 +35,7 @@
   1.2.0   K.Hoang      07/01/2021 Add better debug feature. Optimize code and examples to reduce RAM usage
   1.3.0   K.Hoang      25/02/2021 Add support to AVR ATMEGA_32U4 such as Leonardo, YUN, ESPLORA, etc.
   1.4.0   K.Hoang      01/04/2021 Add support to Adafruit 32U4 and 328(P) such as FEATHER32U4, FEATHER328P, etc.
+  1.4.1   K.Hoang      02/04/2021 Add support to Sparkfun 32U4, 328(P), 128RFA1 such as AVR_PROMICRO, REDBOT, etc.
  *****************************************************************************************************************************/
 /****************************************************************************************************************************
     ISR_Switch demontrates the use of ISR to avoid being blocked by other CPU-monopolizing task
@@ -258,7 +259,8 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println(F("\nStarting ISR_Switch on AVR"));
+  Serial.print(F("\nStarting ISR_Switch on "));
+  Serial.println(BOARD_TYPE);
   Serial.println(TIMER_INTERRUPT_VERSION);
   Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
 

diff --git a/examples/ISR_Timer_Complex/ISR_Timer_Complex.ino b/examples/ISR_Timer_Complex/ISR_Timer_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: 1.4.0
+  Version: 1.4.1
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -35,6 +35,7 @@
   1.2.0   K.Hoang      07/01/2021 Add better debug feature. Optimize code and examples to reduce RAM usage
   1.3.0   K.Hoang      25/02/2021 Add support to AVR ATMEGA_32U4 such as Leonardo, YUN, ESPLORA, etc.
   1.4.0   K.Hoang      01/04/2021 Add support to Adafruit 32U4 and 328(P) such as FEATHER32U4, FEATHER328P, etc.
+  1.4.1   K.Hoang      02/04/2021 Add support to Sparkfun 32U4, 328(P), 128RFA1 such as AVR_PROMICRO, REDBOT, etc.
 *****************************************************************************************************************************/
 
 /****************************************************************************************************************************
@@ -226,7 +227,8 @@ void setup()
   Serial.begin(115200);
   while (!Serial);
 
-  Serial.println(F("\nStarting ISR_Timer_Complex on AVR"));
+  Serial.print(F("\nStarting ISR_Timer_Complex on "));
+  Serial.println(BOARD_TYPE);
   Serial.println(TIMER_INTERRUPT_VERSION);
   Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));