#include <otSerial.h> // For all interrupts service routine you MUST specify FAST_CODE_1 or // FAST_CODE_2 as locator attribute! FAST_CODE_2 void _serialCallBack() { // Get received char U8 rx = UartChar(UART0); // Echo the received char plus LF UartPutChar(UART0, 10); UartPutChar(UART0, rx); UartPutChar(UART0, 10); } void setup() { // Enable UART signal on related ports UartEnableSignals(UART0); // Set baud rate and specify interrupt callback UartReceiveService(UART0, 115200, _serialCallBack); } void loop() { }