From e94b760d621b41e77e358d9c24877162099c47d9 Mon Sep 17 00:00:00 2001
From: Astrid Smith
Date: Sun, 11 Sep 2011 18:17:01 -0700
Subject: Works: measures time and client displays a primitive stripchart.

---
 host/client.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 host/client.c

(limited to 'host/client.c')

diff --git a/host/client.c b/host/client.c
new file mode 100644
index 0000000..29a2455
--- /dev/null
+++ b/host/client.c
@@ -0,0 +1,65 @@
+/* Thinger to read 60hz cycle times and display diagnostics in a kind
+ * of stripcharty way.
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+
+#define QUEUE 100
+#define WIDTH 40
+
+int main(int *argc, char **argv)
+{
+	char line[WIDTH + 10];
+	double bottom = 1000000/59.9;
+	double top = 1000000/60.1;
+	double center = 1000000/60;
+	double queue[QUEUE];
+	int counter;
+	int qpos = 0;
+	int fd = open("/dev/ttyACM0", O_RDONLY);
+
+	while (1) {
+		double current, average;
+		char line[] = "                    |                    ";
+		char inlin[20];
+		int position, pos_avg, i;
+		int len = read(fd, &inlin, 20);
+		if (len == 0) {
+			puts("Fucked\n");
+			continue;
+		}
+		current = (double)atoi(&inlin);
+		queue[qpos++] = current;
+		counter++;
+		if (qpos == QUEUE)
+			qpos = 0;
+
+		average = 0;
+		for (i = 0; i < QUEUE; i++) {
+			average += queue[i];
+		}
+		average /= QUEUE;
+		pos_avg = WIDTH-(int)((top-average)/((top-bottom)/WIDTH));
+		position = WIDTH-(int)((top-current)/((top-bottom)/WIDTH));
+
+		if (position > WIDTH) {
+			line[WIDTH] = '>';
+		} else if (position < 0) {
+			line[0] = '<';
+		} else {
+			line[position] = '.';
+		}
+
+		if (pos_avg > WIDTH) {
+			line[WIDTH] = '_';
+		} else if (pos_avg < 0) {
+			line[0] = '_';
+		} else {
+			line[pos_avg] = '*';
+		}
+		if (counter % 15 == 0)
+			printf("[%s] %f\n", line, 1/(average/1000000));
+	}
+}
-- 
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