RFCFGCH_CHANNEL_MASK
rf_cfgch_a &= ~RFCFGCH_CHANNEL_MASK;
rf_cfgch_b &= ~RFCFGCH_CHANNEL_MASK;
rf_cfgch_a |= (channel & RFCFGCH_CHANNEL_MASK);
rf_cfgch_b |= (channel & RFCFGCH_CHANNEL_MASK);
rf_cfgch_a &= ~RFCFGCH_CHANNEL_MASK;
rf_cfgch_b &= ~RFCFGCH_CHANNEL_MASK;
rf_cfgch_a |= (channel & RFCFGCH_CHANNEL_MASK);
rf_cfgch_b |= (channel & RFCFGCH_CHANNEL_MASK);