v1.2.3 to fix DutyCycle bug, etc.

### Releases v1.2.3

1. Fix `DutyCycle` bug. Check [float precisison of DutyCycle only sometimes working #3](khoih-prog/SAMD_Slow_PWM#3)
2. Fix `New Period` display bug. Check [random dropouts #4](khoih-prog/SAMD_Slow_PWM#4)
3. Update examples

Author: khoih-prog

examples/ISR_16_PWMs_Array/ISR_16_PWMs_Array.ino

@@ -0,0 +1,257 @@
+/****************************************************************************************************************************
+  ISR_16_PWMs_Array.ino
+  For F/L/H/G/WB/MP1 boards
+  Written by Khoi Hoang
+
+  Built by Khoi Hoang https://github.com/khoih-prog/STM32_Slow_PWM
+  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  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.
+*****************************************************************************************************************************/
+
+#if !( defined(STM32F0) || defined(STM32F1) || defined(STM32F2) || defined(STM32F3)  ||defined(STM32F4) || defined(STM32F7) || \
+       defined(STM32L0) || defined(STM32L1) || defined(STM32L4) || defined(STM32H7)  ||defined(STM32G0) || defined(STM32G4) || \
+       defined(STM32WB) || defined(STM32MP1) || defined(STM32L5))
+  #error This code is designed to run on STM32F/L/H/G/WB/MP1 platform! Please check your Tools->Board setting.
+#endif
+
+// These define's must be placed at the beginning before #include "STM32_Slow_PWM.h"
+// _PWM_LOGLEVEL_ from 0 to 4
+// Don't define _PWM_LOGLEVEL_ > 0. Only for special ISR debugging only. Can hang the system.
+#define _PWM_LOGLEVEL_                3
+
+#define USING_MICROS_RESOLUTION       true    //false
+
+// Default is true, uncomment to false
+//#define CHANGING_PWM_END_OF_CYCLE     false
+
+#define MAX_STM32_PWM_FREQ            1000
+
+// To be included only in main(), .ino with setup() to avoid `Multiple Definitions` Linker Error
+#include "STM32_Slow_PWM.h"
+
+#define LED_OFF             LOW
+#define LED_ON              HIGH
+
+#ifndef LED_BUILTIN
+  #define LED_BUILTIN       13
+#endif
+
+#ifndef LED_BLUE
+  #define LED_BLUE          2
+#endif
+
+#ifndef LED_RED
+  #define LED_RED           3
+#endif
+
+#define HW_TIMER_INTERVAL_US      20L
+
+volatile uint64_t startMicros = 0;
+
+// Depending on the board, you can select H7 Hardware Timer from TIM1-TIM22
+// If you select a Timer not correctly, you'll get a message from compiler
+// 'TIMxx' was not declared in this scope; did you mean 'TIMyy'? 
+
+// STM32 OK       : TIM1, TIM4, TIM7, TIM8, TIM12, TIM13, TIM14, TIM15, TIM16, TIM17
+// STM32 Not OK   : TIM2, TIM3, TIM5, TIM6, TIM18, TIM19, TIM20, TIM21, TIM22
+// STM32 No timer : TIM9, TIM10, TIM11. Only for F2, F4 and STM32L1 
+// STM32 No timer : TIM18, TIM19, TIM20, TIM21, TIM22
+
+// Init timer TIM1
+STM32Timer ITimer(TIM1);
+
+// Init STM32_Slow_PWM
+STM32_Slow_PWM ISR_PWM;
+
+//////////////////////////////////////////////////////
+
+void TimerHandler()
+{
+  ISR_PWM.run();
+}
+
+//////////////////////////////////////////////////////
+
+#define NUMBER_ISR_PWMS         16
+
+#define PIN_D0      D0
+#define PIN_D1      D1
+#define PIN_D2      D2
+#define PIN_D3      D3
+#define PIN_D4      D4
+#define PIN_D5      D5
+#define PIN_D6      D6
+#define PIN_D7      D7
+#define PIN_D8      D8
+#define PIN_D9      D9
+#define PIN_D10     D10
+#define PIN_D11     D11
+#define PIN_D12     D12
+
+//////////////////////////////////////////////////////
+
+#define USING_PWM_FREQUENCY     true
+
+//////////////////////////////////////////////////////
+
+// You can assign pins here. Be carefull to select good pin to use or crash, e.g pin 6-11
+uint32_t PWM_Pin[] =
+{
+   LED_BUILTIN, LED_BLUE, LED_RED, PIN_D0, PIN_D1, PIN_D2,  PIN_D3,  PIN_D4,
+   PIN_D5,      PIN_D6,   PIN_D7,  PIN_D8, PIN_D9, PIN_D10, PIN_D11, PIN_D12
+};
+
+// You can assign any interval for any timer here, in microseconds
+uint32_t PWM_Period[] =
+{
+  1000000,     500000,   333333,   250000,   200000,   166667,   142857,   125000,
+   111111,     100000,    66667,    50000,    40000,    33333,    25000,    20000
+};
+
+// You can assign any interval for any timer here, in Hz
+float PWM_Freq[] =
+{
+  1.0f,  2.0f,  3.0f,  4.0f,  5.0f,  6.0f,  7.0f,  8.0f,
+  9.0f, 10.0f, 15.0f, 20.0f, 25.0f, 30.0f, 40.0f, 50.0f
+};
+
+// You can assign any interval for any timer here, in milliseconds
+float PWM_DutyCycle[] =
+{
+   5.00, 10.00, 20.00, 30.00, 40.00, 45.00, 50.00, 55.00,
+  60.00, 65.00, 70.00, 75.00, 80.00, 85.00, 90.00, 95.00
+};
+
+typedef void (*irqCallback)  ();
+
+
+// In STM32, avoid doing something fancy in ISR, for example complex Serial.print with String() argument
+// The pure simple Serial.prints here are just for demonstration and testing. Must be eliminate in working environment
+// Or you can get this run-time error / crash
+void doingSomething0()
+{
+}
+
+void doingSomething1()
+{
+}
+
+void doingSomething2()
+{
+}
+
+void doingSomething3()
+{
+}
+
+void doingSomething4()
+{
+}
+
+void doingSomething5()
+{
+}
+
+void doingSomething6()
+{
+}
+
+void doingSomething7()
+{
+}
+
+void doingSomething8()
+{
+}
+
+void doingSomething9()
+{
+}
+
+void doingSomething10()
+{
+}
+
+void doingSomething11()
+{
+}
+
+void doingSomething12()
+{
+}
+
+void doingSomething13()
+{
+}
+
+void doingSomething14()
+{
+}
+
+void doingSomething15()
+{
+}
+
+irqCallback irqCallbackStartFunc[NUMBER_ISR_PWMS] =
+{
+  doingSomething0,  doingSomething1,  doingSomething2,  doingSomething3, 
+  doingSomething4,  doingSomething5,  doingSomething6,  doingSomething7, 
+  doingSomething8,  doingSomething9,  doingSomething10, doingSomething11,
+  doingSomething12, doingSomething13, doingSomething14, doingSomething15
+};
+
+////////////////////////////////////////////////
+
+void setup()
+{ 
+  Serial.begin(115200);
+  while (!Serial);
+
+  delay(2000);
+
+  Serial.print(F("\nStarting ISR_16_PWMs_Array on ")); Serial.println(BOARD_NAME);
+  Serial.println(STM32_SLOW_PWM_VERSION);
+
+  // Interval in microsecs
+  if (ITimer.attachInterruptInterval(HW_TIMER_INTERVAL_US, TimerHandler))
+  {
+    startMicros = micros();
+    Serial.print(F("Starting ITimer OK, micros() = ")); Serial.println(startMicros);
+  }
+  else
+    Serial.println(F("Can't set ITimer. Select another freq. or timer"));
+
+#if 1
+  // Just to demonstrate, don't use too many ISR Timers if not absolutely necessary
+  // You can use up to 16 timer for each ISR_PWM
+  for (uint16_t i = 0; i < NUMBER_ISR_PWMS; i++)
+  {
+    //void setPWM(uint32_t pin, float frequency, float dutycycle
+    // , timer_callback_p StartCallback = nullptr, timer_callback_p StopCallback = nullptr)
+
+#if USING_PWM_FREQUENCY
+
+    // You can use this with PWM_Freq in Hz
+    ISR_PWM.setPWM(PWM_Pin[i], PWM_Freq[i], PWM_DutyCycle[i], irqCallbackStartFunc[i]);
+
+#else
+  #if USING_MICROS_RESOLUTION
+    // Or using period in microsecs resolution
+    ISR_PWM.setPWM_Period(PWM_Pin[i], PWM_Period[i], PWM_DutyCycle[i], irqCallbackStartFunc[i]);
+  #else
+    // Or using period in millisecs resolution
+    ISR_PWM.setPWM_Period(PWM_Pin[i], PWM_Period[i] / 1000, PWM_DutyCycle[i], irqCallbackStartFunc[i]);
+  #endif
+#endif
+  }
+#endif  
+}
+
+void loop()
+{
+}