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STM32F4 Input Capture TIM2 Channel 4

Question asked by oliver on Aug 21, 2015
Latest reply on Aug 21, 2015 by Clive One

I'm faced to the Problem that I do have to use TIM2 channel 4 for Input capture.
I know that channel 4 can not be used like 1 to 3.
But I thaught I can use the channel 4 to get edges and take CCR4 as counter to take its value each time I detect an positive edge.
I get an IRQ each time a positive edge occurres but CCR4 doesn't count up.
To compare the behaviour I'm using TIM3 channel 1 where it works well with the same configuration (of course TIMx is different) as simple input capture.
Does anyone know where the difference can be?