TeensyTimerTool setPeriod(), setNextPeriod()?

[rajahbee]

Has anyone gotten .setNextPeriod() or .setPeriod() working for the TeensyTimerTool?

I'm trying to change the period of a TCK64 (software) timer from within the timer callback function. My code compiles just fine when I use either of these functions but they don't do anything.

I can get the code to work if I use .begin(), but I am assuming that it is not a good idea to use .begin() within a callback function.

Here is my working code example with .begin() within a callback function.

#include "TeensyTimerTool.h"
using namespace TeensyTimerTool;

PeriodicTimer tmr(TCK64);
// ==============================================
void setup()
{
  // put your setup code here, to run once:
  pinMode(LED_BUILTIN, OUTPUT);
  tmr.begin(callback, 500);  // 50us timer (period is unimportant here, just starting it up)
}
// ==============================================
void callback()   // two 1/4 second LED blinks alternating with two 1/2 second blinks
{
  static uint32_t period[] = {250000, 250000, 250000, 250000, 500000, 500000, 500000, 500000};
  static int x = 0;

  digitalToggleFast(LED_BUILTIN);  
  tmr.begin(callback,period[x]);
  ++x;
  if (x > 7)
    x = 0;
}
// ==============================================
void loop() 
{
}
// end of code

Is the above code 'safe' to run since it seems to work?
The above code is just a simple example to demonstrate the issue I am having. The program I am using it in will be making use of the general technique to perform pre-calculated acceleration profiles for a motor. I don't want to use a motor library if I can help it because I am trying to 'roll my own' and hopefully learn something along the way.

 

[luni]

Those functions are (currently) not implemented for all timers (the PITs should work). Anyway, you should get an corresponding error message. To activate Error handling just add

void setup()
{
  while(!Serial){}
  TeensyTimerTool::attachErrFunc(ErrorHandler(Serial));
  // ....
}

See also: https://github.com/luni64/TeensyTimerTool/wiki/Error-Handling

The code above should be save but it will reconfigure the the timer in its callback which is not very efficient. I can add the missing functions to the TCK timers later this week.

 

[rajahbee]

Those functions are (currently) not implemented for all timers (the PITs should work). Anyway, you should get an corresponding error message. To activate Error handling just add

void setup()
{
  while(!Serial){}
  TeensyTimerTool::attachErrFunc(ErrorHandler(Serial));
  // ....
}

See also: https://github.com/luni64/TeensyTimerTool/wiki/Error-Handling

The code above should be save but it will reconfigure the the timer in its callback which is not very efficient. I can add the missing functions to the TCK timers later this week.

Thanks luni! Good to know about the error handler, I will include that tonight. The fact that it compiled fine really had me stumped!

I'm looking forward to trying out the other TCK functions if/when you have a chance to add them. Awesome library, I really like the versatility of the TCK64 timer(s) especially - Thank you!