altosui: Convert from channels to frequencies

[fw/altos] / altosui / AltosConvert.java

diff --git a/altosui/AltosConvert.java b/altosui/AltosConvert.java
index 8cc1df277ecd1da2041d9c6b2d23223249635026..6a9b699cfe158c025d275fe1bc99767a9eb24e97 100644 (file)
--- a/altosui/AltosConvert.java
+++ b/altosui/AltosConvert.java
@@ -189,4 +189,37 @@ public class AltosConvert {
        {
                return ignite / 32767 * 15.0;
        }
+
+       static double
+       radio_setting_to_frequency(int setting, int cal) {
+               double  f;
+
+               f = 434.550 * setting / cal;
+               /* Round to nearest 50KHz */
+               f = Math.floor (20.0 * f + 0.5) / 20.0;
+               return f;
+       }
+
+       static int
+       radio_frequency_to_setting(double frequency, int cal) {
+               double  set = frequency / 434.550 * cal;
+
+               return (int) Math.floor (set + 0.5);
+       }
+
+       static double
+       radio_channel_to_frequency(int channel) {
+               return 434.550 + channel * 0.100;
+       }
+
+       static int
+       radio_frequency_to_channel(double frequency) {
+               int     channel = (int) Math.floor ((frequency - 434.550) / 0.100 + 0.5);
+
+               if (channel < 0)
+                       channel = 0;
+               if (channel > 9)
+                       channel = 9;
+               return channel;
+       }
 }