altosui: Convert from channels to frequencies

Major areas:

 * Preferences are stored as frequencies instead
   of channels

 * Serial configuration is done using frequencies

 * UI is presented with frequency lists

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/altosui/AltosConvert.java b/altosui/AltosConvert.java
index 8cc1df27..6a9b699c 100644
--- 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;
+	}
 }