Stm32 timer TIM1_CH1 output pulse counter or Freq measurement of TIM8 using TIM8_ETR input

I am using stm32h743i-eval for finding timer8 pwm frequency and duty cycle using TIM8_ETR input from timer1 PWM at 4MHz generating at TIM1_CH1 and measuring pwm Freq and duty cycle at TIM8 using TIM8_ETR. Can anyone help me to understand how to achieve this..

TIM1_CH1 -> TIM8_ETR Upto 4mHz Pwm generation at TIM_CH1 An开发者_开发技巧d measuring pwm Freq and duty cycle at TIM8 using TIM8_ETR