From ba0c2d7592dc5167979754c5141af96f362e9949 Mon Sep 17 00:00:00 2001
From: Philippe Teuwen <phil@teuwen.org>
Date: Sun, 21 Apr 2019 12:11:25 +0200
Subject: [PATCH] doc timings

---
 doc/new_frame_format.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/doc/new_frame_format.txt b/doc/new_frame_format.txt
index 58aacc3d6..0b96e8a6d 100644
--- a/doc/new_frame_format.txt
+++ b/doc/new_frame_format.txt
@@ -220,6 +220,10 @@ struct timeval timeout = {
 
 Add automatically some communication delay in the WaitForResponseTimeout timeout
 Only when using FPC, timeout = 2* empirically measured delay (FTDI cable)
+Empirically measured delay (FTDI cable) with "hw pingng 512" :
+   usb ->    6..32ms
+460800 ->   40..70ms
+  9600 -> 1100..1150ms
 (client/comms.c)
 static size_t communication_delay(void) {
     if (send_via_fpc)  // needed also for Windows USB USART??