From c6a6dca81a0758b2eafde886446e7599b3528fba Mon Sep 17 00:00:00 2001
From: proddy <paul@derbyshire.nl>
Date: Fri, 24 May 2019 12:28:23 +0200
Subject: [PATCH] empty rx fifo after Tx BRK

---
 src/emsuart.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/emsuart.cpp b/src/emsuart.cpp
index 4dde6fe0f..e0b9dd054 100644
--- a/src/emsuart.cpp
+++ b/src/emsuart.cpp
@@ -237,7 +237,7 @@ void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len) {
             emsuart_loopback(true);
             USC0(EMSUART_UART) |= (1 << UCBRK); // set <BRK>
 
-            while (!(U0IS & (1 << UIBD)))                // wait until BRK detected...
+            while (!(U0IS & (1 << UIBD)))          ;      // wait until BRK detected...
                 delayMicroseconds(EMSUART_BIT_TIME / 8); // ~13µs
             USC0(EMSUART_UART) &= ~(1 << UCBRK);         // clear <BRK>
 
@@ -245,6 +245,7 @@ void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len) {
             emsuart_loopback(false); // disable loopback mode
         }
 
+        emsuart_flush_fifos(); // flush Rx buffer to be sure
         ETS_UART_INTR_ENABLE(); // receive anything from FIFO...
 
     }