Timer similar to DueTimer

There is a one shot mode for CreateTimerInterrupt(ContinuousTimerInterrupt, 10000, STM0_inttest);

Please check the user manual!

You cannot call a function from itself! It is not clear what you are trying to do. There is another way to create interrupts using the General Timer system. There are nine general purpose timers available (based on the ATOMs in the GTM) that can be used to call an user-defined function from a periodic interrupts. The longest time is about 170 seconds and the shortest is around 1us. The units of time are by default based on 0.02us per count (50MHz).

Example

We want call this function every 100us using timer 2:
void UserTimer2Handler(int i)
{
digitalWrite(13,!digitalRead(13));
}

First, set the name of the function to be called:

// Set user handlers
TimerChannelConfig[2].user_inthandler = UserTimer2Handler;
Then initialize the Timer 2 channel:

// Initialise general timer channels
InitialiseTimerChannel(2);

Finally, set the period of the interrupt, in units of 0.02us:
// Set period of timers
SetTimerChannelPeriod(2, 5000);

The function UserTimer2Handler() will now be called every 100us.

You can temporarily disable a timer channel using:

DisableTimerChannelInt(2)

And restart it with:

EnableTimerChannelInt(2)

It is possible to create a 10ns pulse on the GTM as it can run at 100MHz. It might be better to draw a diagram of what you want to do as it is not clear from your description!

BTW: This should generate a 10ns pulse at 390kHz on pin 2!

analogWrite(2, 1);

You can control the frequency by writing directly to the GTM ATOM SFR used to generate the period for the analogWrite() function. For pin 2 as the pulse output, use:

GTM_ATOM0_CH0_SR0.U = value;

Value will set the period (1/frequency) in units of 10ns so 1Hz would be 100E6, 200Hz would be 500000 and so on.