MIOS32_Timer problem

MIOS programming (C)
1

I’m initialising a timer from App_Init()

MIOS32_TIMER_Init(1, 20000, TTest, MIOS32_IRQ_PRIO_LOW);

The routine is

void TTest(){
	static	u32 PulseCount; //counter variable
	MIOS32_TIMER_ReInit(1,50000);
	if (++PulseCount&1)
		delH(100);
	else
		delL(200);
}

The port pins are sent high and low with a short soft delay with delH() and delL().

The pin toggles very fast (nothing like 50ms).

The ISR is being triggered repeatedly so fast the application hangs.

Is there anything obvious in my usage?

 

 

2

Based on your observations it looks like MIOS32_TIMER_ReInit (unintentionally) triggers an interrupt.

Which core module are you using?

And does it also happen if MIOS32_Timer_ReInit() is only called on interval changes?

 

E.g. write:

static u32 lastInterval = 0;
   u32 interval = 50000; // could also be a global variable, controlled by app

   if( interval != lastInterval ) {
      lastInterval = interval;
      MIOS32_TIMER_ReInit(1, interval);
   }

Best Regards, Thorsten.

 

Best Regards, Thorsten.

3

Hi TK,

 

I’m using STM32F1x.

 

The application is a complex square wave generator with the interval changes in a state machine inside the ISR.

 

I’ll try your suggestion…

 

Thanks!

4

I’ve used the method you’ve provided and it works ok, as a simple interval timer, auto repeating by default.

Once the interval becomes too short <=4us, the system gets stuck and hangs. This means I need another approach.

 

I’m now in the process of researching how to program the timer registers directly (with the perpheral library) which is time consuming, but will yield very high resolution low cpu performance for the complex patterns required.