diff --git a/cores/arduino/SERCOM.cpp b/cores/arduino/SERCOM.cpp
index b9fbf05b9..ab86aabab 100644
--- a/cores/arduino/SERCOM.cpp
+++ b/cores/arduino/SERCOM.cpp
@@ -112,11 +112,10 @@ void SERCOM::enableUART()
void SERCOM::flushUART()
{
// Skip checking transmission completion if data register is empty
-// if(isDataRegisterEmptyUART())
-// return;
+ // Wait for transmission to complete, if ok to do so.
+ while(!sercom->USART.INTFLAG.bit.TXC && onFlushWaitUartTXC);
- // Wait for transmission to complete
- while(!sercom->USART.INTFLAG.bit.TXC);
+ onFlushWaitUartTXC = false;
}
void SERCOM::clearStatusUART()
@@ -183,6 +182,10 @@ int SERCOM::writeDataUART(uint8_t data)
//Put data into DATA register
sercom->USART.DATA.reg = (uint16_t)data;
+
+ // indicate it's ok to wait for TXC flag when flushing
+ onFlushWaitUartTXC = true;
+
return 1;
}
diff --git a/cores/arduino/SERCOM.h b/cores/arduino/SERCOM.h
index cbc3a05de..80b54de5b 100644
--- a/cores/arduino/SERCOM.h
+++ b/cores/arduino/SERCOM.h
@@ -218,6 +218,11 @@ class SERCOM
uint8_t calculateBaudrateSynchronous(uint32_t baudrate) ;
uint32_t division(uint32_t dividend, uint32_t divisor) ;
void initClockNVIC( void ) ;
+
+ // Flag set when data is loaded into sercom->USART.DATA.reg.
+ // Helps with preventing UART lockups when flushing on startup
+ // and the asyncronous nature of the DRE and TXC interrupt flags.
+ bool onFlushWaitUartTXC = false;
};
#endif
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