int N PHY Frequency Accuracy (int channel)

1. Initialize ret to 0
2. If channel is zero

   1. Call N PHY Stop Playback

   2. If PHY Revision >= 3

      1. Write nphy_saved_bbconf to PHY Register 0x01

      2. Call N PHY Reset CCA

3. Otherwise

   1. If PHY Revision >= 3

      1. Read PHY Register 0x01 and save in nphy_saved_bbconf

      2. MaskSet PHY Register 0x01 with mask 0x7FFF and set with 0

   2. Call N PHY TX Tone with 0, 151, 0, 0 as arguments. Save the returned value as ret.

4. Return ret