Wait until DRE before writing to data register

sandeepmistry · sandeepmistry · commit a361a50e2f0d · 2015-11-03T17:06:41.000-05:00
diff --git a/cores/arduino/SERCOM.cpp b/cores/arduino/SERCOM.cpp
@@ -168,6 +168,9 @@ uint8_t SERCOM::readDataUART()
 
 int SERCOM::writeDataUART(uint8_t data)
 {
+  //Make sure DRE is set before writing to DATA reg
+  while(!isDataRegisterEmptyUART());
+
   //Put data into DATA register
   sercom->USART.DATA.reg = (uint16_t)data;
   return 1;

Original file line number	Diff line number	Diff line change
`@@ -168,6 +168,9 @@ uint8_t SERCOM::readDataUART()`
`168`	`168`
`169`	`169`	`int SERCOM::writeDataUART(uint8_t data)`
`170`	`170`	`{`
	`171`	`+ //Make sure DRE is set before writing to DATA reg`
	`172`	`+ while(!isDataRegisterEmptyUART());`
	`173`	`+`
`171`	`174`	`//Put data into DATA register`
`172`	`175`	`sercom->USART.DATA.reg = (uint16_t)data;`
`173`	`176`	`return 1;`