Can't find struct usart_async_descriptor

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Hi,

I am (of course) new to ASF & Atmel Start and I am trying to register callbacks. I download Start code for the Sam D20 USART sercom4, which writes "hello world" to sercom/PB08. I am now trying to add callbacks so I can receive. 

 

Now, I may be missing something but it looks like Amtel did not provide me with the #include files to do this. Furthermore the studio does not recognize usart_async_register_callback and I also can't find struct usart_async_descriptor. struct usart_async_descriptor is needed as a

parameter of to the actual callback function. 

 

 

 

How can I add the functionality to my prog

 

 

Edit PLEASE disregard 

 

 

Thanks.

Tony

Stay Calm and Listen to the Grateful Dead

Last Edited: Tue. Oct 1, 2019 - 02:56 PM