From 0de87ce40d0a2de597a6745d29185265d21a2b69 Mon Sep 17 00:00:00 2001
From: Marcin Dawidowicz <40853321+mdejw@users.noreply.github.com>
Date: Wed, 21 Feb 2024 22:32:49 +0100
Subject: [PATCH] Send serial data to sim uart only if rx_ready is set.

---
 .../sim/core/modules/serial2console/serial2console.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/litex/build/sim/core/modules/serial2console/serial2console.c b/litex/build/sim/core/modules/serial2console/serial2console.c
index 824662170..05dba1282 100644
--- a/litex/build/sim/core/modules/serial2console/serial2console.c
+++ b/litex/build/sim/core/modules/serial2console/serial2console.c
@@ -155,11 +155,13 @@ static int serial2console_tick(void *sess, uint64_t time_ps) {
   }
 
   *s->rx_valid = 0;
-  if(s->datalen) {
-    *s->rx = s->databuf[s->data_start];
-    s->data_start = (s->data_start + 1) % 2048;
-    s->datalen--;
-    *s->rx_valid = 1;
+  if(*s->rx_ready) {
+    if(s->datalen) {
+      *s->rx = s->databuf[s->data_start];
+      s->data_start = (s->data_start + 1) % 2048;
+      s->datalen--;
+      *s->rx_valid = 1;
+    }
   }
 
   return RC_OK;