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ADC'value can't be updated after exit from stop mode

Question asked by guo.xinwen on Jan 12, 2015
Now I'm using STM32F103RE and system will enter stop mode with a periodic RTC wakeup routine.
But sometimes when system exites from STOP MODE, the adc's value can't be updated correctly, especially when system enter STOP MODE for a long time.
OCZ, there will be a periodic RTC routine wakeup to feed WDG.
After exit from STOP mode, I re-init system clock using the example code's "SYSCLKConfig_STOP()". All the other peripherals work well but the ADC.

The ADC uses DMA.
So somebody can give me some advices?