altosui: Add a few simple unit conversions

[fw/altos] / altosui / AltosConvert.java

diff --git a/altosui/AltosConvert.java b/altosui/AltosConvert.java
index c2ae9a507897079970036ebef8cca8505b306e66..db7039ec5294a5dc16b8e99248a6612360fb3a0a 100644 (file)
--- a/altosui/AltosConvert.java
+++ b/altosui/AltosConvert.java
@@ -220,4 +220,36 @@ public class AltosConvert {
        static double radio_channel_to_frequency(int channel) {
                return 434.550 + channel * 0.100;
        }
+
+       static int[] ParseHex(String line) {
+               String[] tokens = line.split("\\s+");
+               int[] array = new int[tokens.length];
+
+               for (int i = 0; i < tokens.length; i++)
+                       try {
+                               array[i] = Integer.parseInt(tokens[i], 16);
+                       } catch (NumberFormatException ne) {
+                               return null;
+                       }
+               return array;
+       }
+
+       static double meters_to_feet(double meters) {
+               return meters * (100 / (2.54 * 12));
+       }
+
+       static double meters_to_mach(double meters) {
+               return meters / 343;            /* something close to mach at usual rocket sites */
+       }
+
+       static double meters_to_g(double meters) {
+               return meters / 9.80665;
+       }
+
+       static int checksum(int[] data, int start, int length) {
+               int     csum = 0x5a;
+               for (int i = 0; i < length; i++)
+                       csum += data[i + start];
+               return csum & 0xff;
+       }
 }