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stm32l152c-discovery board 32.768KHZ RTC crystal not working

Question asked by yuqian on Feb 15, 2016
Latest reply on Feb 15, 2016 by Clive One
I am trying the RTC function on the STM32L152C-discovery board, i have enabled LSE in the CubeMX (i did same for the HSE, it is working good), but i never got the RTC crystal working, i have tried to use scope to watch its wave, but nothing in there. 
does anyone who have such issue for the RTC?