From ffe4fe7e17f7662f9fd71b2c428f37d1777b5d3f Mon Sep 17 00:00:00 2001
From: Raphael Coeffic <raphaelcoeffic@users.noreply.github.com>
Date: Thu, 13 Oct 2022 01:33:51 +0200
Subject: [PATCH] fix: clear internal module FIFO after DMA init (#2527)

Otherwise, NDTR will be 0 instead of [buffer size], and thus the read index will not be set to the correct value.
---
 radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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 291374385..58e8f6989 100755
--- a/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
+++ b/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
@@ -148,10 +148,10 @@ void* intmoduleSerialStart(const etx_serial_init* params)
 
   stm32_usart_init(&intmoduleUSART, params);
 
-  intmoduleCtx.rxFifo->clear();
   if (params->rx_enable && intmoduleUSART.rxDMA) {
     stm32_usart_init_rx_dma(&intmoduleUSART, intmoduleFifo.buffer(), intmoduleFifo.size());
   }  
+  intmoduleCtx.rxFifo->clear();
   
   return (void*)&intmoduleCtx;
 }