38f44a627b
STM32L4 DFSDM: add peripheral, DAC, TIM: small changes
* STM32L4 DAC: do not configure output pin if it is not used
* STM32L4 TIM: fix compilation of timers with complementary outputs when not PWM_MULTICHAN
* STM32L4 DFSDM: peripheral for digital filters for sigma-delta ADCs
Initial version. Timer trigger support is not completed and there is
some issue with DMA.
Approved-by: Gregory Nutt <gnutt@nuttx.org>
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