TimerCounter::restart doesn't seem to work?

[RatGit]

I haven't had time to investigate this further, but in one of my test systems, I have to use TimerCounter::start instead of TimerCounter::restart to get the intended/expected behaviour for an aperiodic TimerCounter?

See the "else if (tapCounter == 2)" block below:

#include <System.h>
#include <TimerCounter.h>
using namespace SAMD21LPE;

#define EXT_INT_PIN PIN_A0

TimerCounter timer;

const byte GCLKGEN_ID_1K = 6;
const uint32_t timerDuration = 800; // 800 ms

bool timerFlag = false;
uint8_t tapCounter = 0;

void externalInterruptHandler()
{
 tapCounter++;
}

void timerInterruptHandler()
{
 timerFlag = true; 
}

void setupEIC()
{
 noInterrupts();

 System::reducePowerConsumption();  // disable non essential MCU modules (incl. USB, PORT and EIC)

 // enable PORT and EIC modules
 System::enablePORT();
 System::enableEIC();

 // Enable external interrupt on pin A0/D0
 pinMode(EXT_INT_PIN, INPUT_PULLUP);
 attachInterrupt(EXT_INT_PIN, externalInterruptHandler, FALLING);

 // Configure low power clock generator to run at 1024 Hz
 System::setupClockGenOSCULP32K(GCLKGEN_ID_1K, 4); // DIV = 2^(4+1) = 32, clkGenFrequency = 32768/DIV = 1024 Hz

 // Change clock generator for EIC from 0 (DFLL48M, assigned by attachInterrupt) to 6 (OSCULP32K), which stays enabled in standby (required for input edge detection)
 System::enableClock(GCM_EIC, GCLKGEN_ID_1K);

 interrupts();
}

void setup()
{
 // Setup external interrupt controller
 setupEIC();

 // Select sleep mode STANDBY between ISR calls and disable sleep-on-exit mode
 System::setSleepOnExitISR(false);
 System::setSleepMode(System::STANDBY);
}

void loop()
{
 System::sleep(); // Sleep until external interrupt

 if (timerFlag)
 {
  timerFlag = false; // Clear timer flag
  tapCounter = 0;    // Reset tap count

  timer.disable();   // Disable timer counter

  digitalWrite(PIN_LED3, HIGH); // Turn off LED3

  digitalWrite(PIN_LED, LOW); // Toggle LED
  delay(500);
  digitalWrite(PIN_LED, HIGH);
 }

 // Triple Tap Detection with "timerDuration" timeout between taps
 if (tapCounter == 1)
 {
  digitalWrite(PIN_LED3, HIGH); // Turn off LED3

  timerFlag = false;            // Clear timer flag

  timer.enable(4, GCLKGEN_ID_1K, 1024, TimerCounter::DIV1, TimerCounter::RES16, 1000, true);  // Configure and enable timer counter
  timer.start(timerDuration, false, timerInterruptHandler);  // Run timer for "timerDuration" milliseconds
 }
 else if (tapCounter == 2)
 {
  timerFlag = false;  // Clear timer flag
// timer.restart();    // Restart timer, (retaining previous start settings), (this doesn't seem to properly restart the counter?)
  timer.start(timerDuration, false, timerInterruptHandler);  // Run timer for "timerDuration" milliseconds
 }
 else if (tapCounter >= 3)
 {
  timer.disable(); // Disable timer counter
 
  digitalWrite(PIN_LED3, LOW);   // Toggle LED3
  delay(500);
  digitalWrite(PIN_LED3, HIGH);
 
  tapCounter = 0;  // Reset tap count
 }
}