--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vcxo-manual/linear.c	Sat May 20 18:49:35 2017 +0000
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "meas.h"
+
+struct meas meas[2];
+float lin_a, lin_b, target_off;
+int target_dac;
+
+main(argc, argv)
+	char **argv;
+{
+	if (argc < 2 || argc > 3) {
+		fprintf(stderr, "usage: %s meas-file [target]\n", argv[0]);
+		exit(1);
+	}
+	read_meas_file(argv[1], meas, 2);
+	if (argc > 2)
+		target_off = atof(argv[2]);
+	else
+		target_off = 0;
+	lin_a = (float)(meas[1].freq_offset - meas[0].freq_offset) /
+		(float)(meas[1].dac_value - meas[0].dac_value);
+	lin_b = (float)meas[1].freq_offset - lin_a * meas[1].dac_value;
+	target_dac = (target_off - lin_b) / lin_a;
+	printf("%d\n", target_dac);
+	exit(0);
+}