From daf966eaa629d59487b57f907b62f642995d829e Mon Sep 17 00:00:00 2001
From: Astrid Smith
Date: Fri, 28 Oct 2011 21:44:42 -0700
Subject: Calibrator, version that works (kind of) with milliseconds

---
 host/calibrator_client.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 host/calibrator_client.c

(limited to 'host/calibrator_client.c')

diff --git a/host/calibrator_client.c b/host/calibrator_client.c
new file mode 100644
index 0000000..3b5eee5
--- /dev/null
+++ b/host/calibrator_client.c
@@ -0,0 +1,82 @@
+/* Thinger to read 60hz cycle times and display diagnostics in a kind
+ * of stripcharty way.
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <time.h>
+
+// window for reporting, in cycles
+#define REPORT_FREQ 60
+// width of the bargraph
+#define WIDTH 40
+// timer cycles per second
+#define SCALE 1000000
+// length between nominal timer overflows, in microseconds
+// (1 overflow / 65'536 microseconds) * (1'000'000 microseconds)
+#define TICKSIZE (SCALE / 65536)
+
+#define NANOSECOND 1000000000
+#define MILLISECOND 1000
+
+#define NOMINAL 60
+#define MOTION 0.2
+
+int main(int *argc, char **argv)
+{
+	char line[WIDTH + 10];
+	char blankline[] = "                    |                    ";
+	double bottom = SCALE/(NOMINAL-MOTION);
+	double top = SCALE/(NOMINAL+MOTION);
+	double center = SCALE/(NOMINAL);
+	int counter;
+	int qpos = 0;
+	int fd = open("/dev/ttyACM0", O_RDONLY);
+
+	long int count_total = 0;	// total overflows so far ever
+	struct timespec initial;	// initial timestamp
+
+	signed long long int initial_nsec;
+	signed long int initial_msec;
+
+	strcpy(&line, &blankline);
+
+	clock_gettime(CLOCK_REALTIME, &initial);
+
+	initial_nsec = initial.tv_nsec;
+
+	initial_msec = (initial.tv_sec * 1000) + (initial.tv_nsec / (1000 * 1000));
+
+	while (1) {
+		double current, average;
+		char inlin[20];
+		int position, pos_avg, i;
+		int len;
+
+		struct timespec current_time;
+		signed long long int cur_nsec;
+		signed long int cur_msec;
+
+		long double nominal, measured;
+
+		len = read(fd, &inlin, 1);
+		if (len == 0) {
+			puts("Fucked\n");
+			continue;
+		}
+		clock_gettime(CLOCK_REALTIME, &current_time);
+		cur_nsec = (current_time.tv_nsec) + ((current_time.tv_sec - initial.tv_sec) * 1000 * 1000 * 1000);
+		cur_msec = (current_time.tv_nsec / (1000 * 1000)) + ((current_time.tv_sec) * 1000);
+
+		count_total++;
+
+		nominal = (long double) count_total / TICKSIZE;
+		//measured = (cur_nsec - initial_nsec) / NANOSECOND;
+		measured = (cur_msec - initial_msec) / MILLISECOND;
+
+		printf("% '05.8Lf - % '05.8Lf, % '05.8Lf\n", nominal, measured, measured/nominal);
+
+	}
+}
-- 
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