-/**
- * DAC ISR callback.
- * This function has to be called by the DAC ISR when a sample of the configured
- * channel has been converted out.
- *
- * \param af Afsk context to operate one (\see Afsk).
- *
- * \note The next DAC output sample is supplied by the Afsk driver through calling
- * the AFSK_DAC_SET() callback.
- */
-void afsk_dac_isr(Afsk *af);
-
-/**
- * Initialize an AFSK1200 modem.
- * \param af Afsk context to operate one (\see Afsk).
- * \param adc_ch ADC channel used by the demodulator.
- * \param dac_ch DAC channel used by the modulator.
- */
+void afsk_adc_isr(Afsk *af, int8_t sample);
+uint8_t afsk_dac_isr(Afsk *af);