STM32_LPTIM_CKPOL_BOTH_EDGES
if (priv->polarity == STM32_LPTIM_CKPOL_BOTH_EDGES) {
priv->polarity = STM32_LPTIM_CKPOL_BOTH_EDGES;
case STM32_LPTIM_CKPOL_BOTH_EDGES:
priv->polarity = STM32_LPTIM_CKPOL_BOTH_EDGES;