Change flush semantics to match AVR, fixes #82

TomKeddie · cmaglie · commit 7fad702687ac · 2016-01-18T11:46:45.000+01:00
diff --git a/cores/arduino/SERCOM.cpp b/cores/arduino/SERCOM.cpp
@@ -105,7 +105,7 @@ void SERCOM::enableUART()
 void SERCOM::flushUART()
 {
   // Wait for transmission to complete
-  while(sercom->USART.INTFLAG.bit.DRE != SERCOM_USART_INTFLAG_DRE);
+  while(!sercom->USART.INTFLAG.bit.TXC);
 }
 
 void SERCOM::clearStatusUART()
@@ -161,8 +161,8 @@ uint8_t SERCOM::readDataUART()
 
 int SERCOM::writeDataUART(uint8_t data)
 {
-  //Flush UART buffer
-  flushUART();
+  // Wait for data register to be empty
+  while(!isDataRegisterEmptyUART());
 
   //Put data into DATA register
   sercom->USART.DATA.reg = (uint16_t)data;

Original file line number	Diff line number	Diff line change
`@@ -105,7 +105,7 @@ void SERCOM::enableUART()`
`105`	`105`	`void SERCOM::flushUART()`
`106`	`106`	`{`
`107`	`107`	`// Wait for transmission to complete`
`108`		`- while(sercom->USART.INTFLAG.bit.DRE != SERCOM_USART_INTFLAG_DRE);`
	`108`	`+ while(!sercom->USART.INTFLAG.bit.TXC);`
`109`	`109`	`}`
`110`	`110`
`111`	`111`	`void SERCOM::clearStatusUART()`
`@@ -161,8 +161,8 @@ uint8_t SERCOM::readDataUART()`
`161`	`161`
`162`	`162`	`int SERCOM::writeDataUART(uint8_t data)`
`163`	`163`	`{`
`164`		`- //Flush UART buffer`
`165`		`- flushUART();`
	`164`	`+ // Wait for data register to be empty`
	`165`	`+ while(!isDataRegisterEmptyUART());`
`166`	`166`
`167`	`167`	`//Put data into DATA register`
`168`	`168`	`sercom->USART.DATA.reg = (uint16_t)data;`