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Trigger interrupts for ETR

Question asked by Alexey G. on May 18, 2014
Latest reply on May 19, 2014 by waclawek.jan

(Using the STM32F103RBT6 chip)

I've configured TIM2 timer as a prescaler for TIM3 (RM0008 page 386).
Timer TIM2 is configured for ETR (RM0008 page 365).

So what I've got is a 32bit timer counting pulses on PA0 (successfully working).

Now I want to get an interrupt on the rising edge of the pulses that fed to ETR
pin while I count them (TGI interrupt as shown on RM0008 page 352 figure 100).

When I configure TIM2 for trigger interrupt:

TIM_ITConfig(TIM2, TIM_IT_Trigger, ENABLE);

Nothing happens, but if I configure it for Update interrupt as:

TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

I'm actually getting the Update interrupt as it should.

Am I missing something?