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how to capture the HALL using PA15/TIM1_CH1_ETR of STM32F051?

Question asked by ji.zhang on Jun 15, 2015
Latest reply on Jun 16, 2015 by waclawek.jan
Hello,everyone. I want to capture 3 HALLs by TIM2 of STM32F051. The 3 pins are PA15,PA1 and PB10. I captured the period of HALL with PA1 and PA10 successfully, but failed with PA15. The funtion of PA15 is AF2, and the pin is defined as TIM2_CH1_ETR. The CH1 and ETR cannot be used at the same time, but I don't know how to config the TIM2_CH1_ETR into CH1 to capture HALL.If there's someone knows, I will appreciate it.