From 496c3861c4ced46c1c08c987a52ac1182f13dd23 Mon Sep 17 00:00:00 2001
From: Raphael Coeffic <raphael.coeffic@frafos.com>
Date: Sun, 14 Nov 2021 17:52:08 +0100
Subject: [PATCH] Fix targets with internal module UART without DMA

---
 .../src/targets/common/arm/stm32/intmodule_serial_driver.cpp  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp b/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
index cdaaff4c6..5b5c5a3b2 100755
--- a/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
+++ b/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
@@ -24,7 +24,7 @@
 ModuleFifo intmoduleFifo;
 #if !defined(INTMODULE_DMA_STREAM)
 uint8_t * intmoduleTxBufferData;
-uint8_t intmoduleTxBufferRemaining;
+volatile uint8_t intmoduleTxBufferRemaining;
 #endif
 
 void intmoduleStop()
@@ -214,6 +214,6 @@ void intmoduleWaitForTxCompleted()
     DMA_ClearFlag(INTMODULE_DMA_STREAM, INTMODULE_DMA_FLAG_TC);
   }
 #else
-  #error "intmoduleWaitForTC() not implemented for IRQ based transfer"
+  while (intmoduleTxBufferRemaining > 0);
 #endif
 }