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TIM_PWM_INPUT for 8 inputs

Question asked by chechio.cesare on Sep 17, 2014
Latest reply on Sep 18, 2014 by Clive One
Hello everyone, 
I'm using the board STM32F4-discovery, 

I redid the example TIM_PWM_INPUT and everything works, I can measure the frequency. 

The problem occurs when I want to simultaneously measure 8 different speeds. For 4 works well. 

I used up to now the following interrupt associated with each pin: 

TIM2_IRQn; -> PB.3 
TIM3_IRQn; -> PB.5 
TIM4_IRQn; -> PB.7 
TIM5_IRQn; -> PA.1 

Question: What other pins can be used to measure the other speeds?