+/**
+ * Initialize the specified channel of the DAC for AFSK needs.
+ * The DAC has to be configured in order to call an ISR for every sample sent.
+ * The DAC doesn't have to start the IRQ immediatly but have to wait
+ * the AFSK driver to call AFSK_DAC_IRQ_START().
+ * The ISR must then call afsk_dac_isr() passing the AFSK context.
+ * \param ch DAC channel to be used for AFSK modulation.
+ * \param ctx AFSK context (\see Afsk). This parameter must be saved and
+ * passed back to afsk_dac_isr() for every convertion.
+ */
+#define AFSK_DAC_INIT(ch, ctx) do { (void)ch, (void)ctx; } while (0)