From 1ae30bc64cbd8d34da8a54bc36de2e640e5d65bc Mon Sep 17 00:00:00 2001
From: Ciro Cattuto <ciro.cattuto@gmail.com>
Date: Tue, 28 Dec 2021 21:54:45 +0100
Subject: [PATCH] Improved read() and write() behavior

Re-read head and tail of RTT buffers on every call to read() or write(), to avoid issues when target restarts and resets RTT buffers' state between calls.
---
 examples/rtt/rtt.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/examples/rtt/rtt.js b/examples/rtt/rtt.js
index 4aaeccf..7950865 100644
--- a/examples/rtt/rtt.js
+++ b/examples/rtt/rtt.js
@@ -112,6 +112,7 @@ class RTT {
     async read (bufId) {
         var buf = this.bufUp[bufId];
 
+        buf.RdOff = await this.processor.readMem32(buf.bufAddr + 16);
         buf.WrOff = await this.processor.readMem32(buf.bufAddr + 12);
 
         if (buf.WrOff > buf.RdOff) {
@@ -136,6 +137,7 @@ class RTT {
         var buf = this.bufDown[bufId];
 
         buf.RdOff = await this.processor.readMem32(buf.bufAddr + 16);
+        buf.WrOff = await this.processor.readMem32(buf.bufAddr + 12);
 
         if (buf.WrOff >= buf.RdOff)
             var num_avail = buf.SizeOfBuffer - (buf.WrOff - buf.RdOff);