ADMA_CH_TC
tdma_ch_write(tdc, ADMA_CH_TC - tdc->tdma->cdata->ch_tc_offset_diff, ch_regs->tc);
ch_reg->tc = tdma_ch_read(tdc, ADMA_CH_TC - tdma->cdata->ch_tc_offset_diff);
tdma_ch_write(tdc, ADMA_CH_TC - tdma->cdata->ch_tc_offset_diff, ch_reg->tc);