Added functionality to pass custom parameter to HardwareTimer callback

Update example following implementation of stm32duino/Arduino_Core_STM32#892
And add a new examplek to show how to use parameter.

examples/NonReg/HardwareTimer/HardwareTimer_OutputInput_test/HardwareTimer_OutputInput_test.ino

@@ -102,23 +102,23 @@ uint32_t test_Status = PASSED;
 ** Interrupt callback
 ***************************************/
 /********    Output    *****/
-void output_Update_IT_callback(HardwareTimer *)
+void output_Update_IT_callback(void)
 {
   Output_Update++;
 }
 
-void Output_Compare1_IT_callback(HardwareTimer *)
+void Output_Compare1_IT_callback(void)
 {
   Output_Compare1++;
 }
 
-void Output_Compare2_IT_callback(HardwareTimer *)
+void Output_Compare2_IT_callback(void)
 {
   Output_Compare2++;
 }
 
 /********    Input 1   *****/
-void Input_Capture1_Rising_IT_callback(HardwareTimer *)
+void Input_Capture1_Rising_IT_callback(void)
 {
   Current1_Capture = MyTim_input->getCaptureCompare(Freq1_channelRising);
   /* frequency computation */
@@ -138,7 +138,7 @@ void Input_Capture1_Rising_IT_callback(HardwareTimer *)
   rolloverCompare1Count = 0;
 }
 
-void Input_Capture1_Falling_IT_callback(HardwareTimer *)
+void Input_Capture1_Falling_IT_callback(void)
 {
   /* prepare DutyCycle computation */
   Current1_Capture = MyTim_input->getCaptureCompare(Freq1_channelFalling);
@@ -155,7 +155,7 @@ void Input_Capture1_Falling_IT_callback(HardwareTimer *)
 }
 
 /********    Input 2   *****/
-void Input_Capture2_Rising_IT_callback(HardwareTimer *)
+void Input_Capture2_Rising_IT_callback(void)
 {
   Current2_Capture = MyTim_input->getCaptureCompare(Freq2_channelRising);
   /* frequency computation */
@@ -175,7 +175,7 @@ void Input_Capture2_Rising_IT_callback(HardwareTimer *)
   rolloverCompare2Count = 0;
 }
 
-void Input_Capture2_Falling_IT_callback(HardwareTimer *)
+void Input_Capture2_Falling_IT_callback(void)
 {
   /* prepare DutyCycle computation */
   Current2_Capture = MyTim_input->getCaptureCompare(Freq2_channelFalling);
@@ -194,7 +194,7 @@ void Input_Capture2_Falling_IT_callback(HardwareTimer *)
 /********    Input rollover   *****/
 /* In case of timer rollover, frequency is to low to be measured set values to 0
    To reduce minimum frequency, it is possible to increase prescaler. But this is at a cost of precision. */
-void Rollover_IT_callback(HardwareTimer *)
+void Rollover_IT_callback(void)
 {
   rolloverCompare1Count++;
   rolloverCompare2Count++;

examples/Peripherals/HardwareTimer/Frequency_Dutycycle_measurement/Frequency_Dutycycle_measurement.ino

@@ -25,7 +25,7 @@ HardwareTimer *MyTim;
     @brief  Input capture interrupt callback : Compute frequency and dutycycle of input signal
 
 */
-void TIMINPUT_Capture_Rising_IT_callback(HardwareTimer*)
+void TIMINPUT_Capture_Rising_IT_callback(void)
 {
   CurrentCapture = MyTim->getCaptureCompare(channelRising);
   /* frequency computation */
@@ -47,7 +47,7 @@ void TIMINPUT_Capture_Rising_IT_callback(HardwareTimer*)
 
 /* In case of timer rollover, frequency is to low to be measured set values to 0
    To reduce minimum frequency, it is possible to increase prescaler. But this is at a cost of precision. */
-void Rollover_IT_callback(HardwareTimer*)
+void Rollover_IT_callback(void)
 {
   rolloverCompareCount++;
 
@@ -62,7 +62,7 @@ void Rollover_IT_callback(HardwareTimer*)
     @brief  Input capture interrupt callback : Compute frequency and dutycycle of input signal
 
 */
-void TIMINPUT_Capture_Falling_IT_callback(HardwareTimer*)
+void TIMINPUT_Capture_Falling_IT_callback(void)
 {
   /* prepare DutyCycle computation */
   CurrentCapture = MyTim->getCaptureCompare(channelFalling);

examples/Peripherals/HardwareTimer/InputCapture/InputCapture.ino

@@ -19,7 +19,7 @@ uint32_t input_freq = 0;
 volatile uint32_t rolloverCompareCount = 0;
 HardwareTimer *MyTim;
 
-void InputCapture_IT_callback(HardwareTimer*)
+void InputCapture_IT_callback(void)
 {
   CurrentCapture = MyTim->getCaptureCompare(channel);
   /* frequency computation */
@@ -36,7 +36,7 @@ void InputCapture_IT_callback(HardwareTimer*)
 
 /* In case of timer rollover, frequency is to low to be measured set value to 0
    To reduce minimum frequency, it is possible to increase prescaler. But this is at a cost of precision. */
-void Rollover_IT_callback(HardwareTimer*)
+void Rollover_IT_callback(void)
 {
   rolloverCompareCount++;
 

examples/Peripherals/HardwareTimer/PWM_FullConfiguration/PWM_FullConfiguration.ino

@@ -28,12 +28,12 @@
 #define pin2  D3
 #endif
 
-void Update_IT_callback(HardwareTimer*)
+void Update_IT_callback(void)
 { // Update event correspond to Rising edge of PWM when configured in PWM1 mode
   digitalWrite(pin2, LOW); // pin2 will be complementary to pin
 }
 
-void Compare_IT_callback(HardwareTimer*)
+void Compare_IT_callback(void)
 { // Compare match event correspond to falling edge of PWM when configured in PWM1 mode
   digitalWrite(pin2, HIGH);
 }

examples/Peripherals/HardwareTimer/Timebase_callback/Timebase_callback.ino

@@ -11,7 +11,7 @@
 #define pin  D2
 #endif
 
-void Update_IT_callback(HardwareTimer*)
+void Update_IT_callback(void)
 { // Toggle pin. 10hz toogle --> 5Hz PWM
   digitalWrite(pin, !digitalRead(pin));
 }

examples/Peripherals/HardwareTimer/Timebase_callback_with_parameter/Timebase_callback.ino

@@ -0,0 +1,48 @@
+/*
+  Timebase callback
+  This example shows how to configure HardwareTimer to execute a callback with some parameter at regular interval.
+  Callback toggles pin.
+  Once configured, there is only CPU load for callbacks executions.
+*/
+
+#if defined(LED_BUILTIN)
+#define pin  LED_BUILTIN
+#else
+#define pin  D2
+#endif
+
+
+uint32_t MyData = 1; // Parameter used for callback is arbitrarily a pointer to uint32_t, it could be of other type.
+
+// Every second, print on serial MyData. And increment it.
+void Update_IT_callback(uint32_t* data)
+{
+  Serial.println(*data);
+  *data = *data + 1;
+}
+
+void setup()
+{
+  Serial.begin(9600); 
+#if defined(TIM1)
+  TIM_TypeDef *Instance = TIM1;
+#else
+  TIM_TypeDef *Instance = TIM2;
+#endif
+
+  // Instantiate HardwareTimer object. Thanks to 'new' instanciation, HardwareTimer is not destructed when setup() function is finished.
+  HardwareTimer *MyTim = new HardwareTimer(Instance);
+
+  // configure pin in output mode
+  pinMode(pin, OUTPUT);
+
+  MyTim->setOverflow(1, HERTZ_FORMAT); // 1 Hz
+  MyTim->attachInterrupt(std::bind(Update_IT_callback, &MyData)); // bind argument to callback: When Update_IT_callback is called MyData will be given as argument
+  MyTim->resume();
+}
+
+
+void loop()
+{
+  /* Nothing to do all is done by hardware. Even no interrupt required. */
+}