ESRC_ADC
eap1371_src_write(sc, ESRC_ADC+ESRC_TRUNC_N, out);
out = eap1371_src_read(sc, ESRC_ADC+ESRC_IREGS) & 0xff;
eap1371_src_write(sc, ESRC_ADC+ESRC_IREGS, out |
eap1371_src_write(sc, ESRC_ADC+ESRC_VFF, freq & 0x7fff);