Hello bernadett,
There is a UART demo about FRDM-KE02Z in the attachment , you can refer to it , after download
it , then you can find it at here :
KE02-SC\ke02-sc\src\projects\Uart_demo
About the demo information you can refer to the "Readme.txt" :
The UART1 sends the "Running the Uart_demo project" with polling mode.
and then enter the interrupt mode.
First, the UART1 sends the string "hello world" to the hyperterminal;
Second, the UART1 will send the character to Hyperterminal which you entered, and RED led will flicker.
Hope it helps!
Have a great day,
Alice
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