From fc4551bfbf4d40846eb0d14f347ae5b827dd5950 Mon Sep 17 00:00:00 2001
From: Neil Gershenfeld <gersh@cba.mit.edu>
Date: Wed, 31 Mar 2021 21:39:57 -0400
Subject: [PATCH] start comm
---
comm/SerialUSB/ring.SerialUSB.ino | 25 ++++++++++++++++++++
comm/pySerial/ring.pySerial.py | 38 +++++++++++++++++++++++++++++++
2 files changed, 63 insertions(+)
create mode 100644 comm/SerialUSB/ring.SerialUSB.ino
create mode 100755 comm/pySerial/ring.pySerial.py
diff --git a/comm/SerialUSB/ring.SerialUSB.ino b/comm/SerialUSB/ring.SerialUSB.ino
new file mode 100644
index 0000000..bbd5f9e
--- /dev/null
+++ b/comm/SerialUSB/ring.SerialUSB.ino
@@ -0,0 +1,25 @@
+//
+// ring.SerialUSB.ino
+//
+// SerialUSB communication ring test
+//
+// Neil Gershenfeld 3/31/21
+//
+// This work may be reproduced, modified, distributed,
+// performed, and displayed for any purpose, but must
+// acknowledge this project. Copyright is retained and
+// must be preserved. The work is provided as is; no
+// warranty is provided, and users accept all liability.
+//
+
+void setup() {
+ SerialUSB.begin(0);
+ }
+
+void loop() {
+ while (true) {
+ if (SerialUSB.available()) {
+ SerialUSB.write(1+SerialUSB.read());
+ }
+ }
+ }
diff --git a/comm/pySerial/ring.pySerial.py b/comm/pySerial/ring.pySerial.py
new file mode 100755
index 0000000..560aafd
--- /dev/null
+++ b/comm/pySerial/ring.pySerial.py
@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+#
+# ring.pySerial.py
+#
+# pySerial communication ring test
+#
+# Neil Gershenfeld 3/31/21
+#
+# This work may be reproduced, modified, distributed,
+# performed, and displayed for any purpose, but must
+# acknowledge this project. Copyright is retained and
+# must be preserved. The work is provided as is; no
+# warranty is provided, and users accept all liability.
+#
+
+import serial,sys,time
+
+nloop = 10
+
+if (len(sys.argv) != 3):
+ print("command line: ring.pyserial.py serial_port port_speed")
+ sys.exit()
+port = sys.argv[1]
+speed = int(sys.argv[2])
+
+ser = serial.Serial(port,speed)
+ser.flushInput()
+x = 0
+start = time.time()
+for i in range(nloop):
+ while True:
+ ser.write(x.to_bytes(1,byteorder='big'))
+ x = int.from_bytes(ser.read(1),byteorder='big')
+ if (x == 0):
+ break
+end = time.time()
+print(f"byte ring cycles per second: {nloop*256/(end-start):6.3g}")
+
--
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