ISD51 User's Guide

Shared Serial Interface

Your user program may share the serial port with ISD51. All serial I/O from your program is sent to and read from the Serial Window in the µVision Debugger.

To enable serial port sharing, you must enable the ISD51 serial I/O routines (putchar and _getkey) using the ISD_PUTCHAR and ISD_GETKEY #defines in ISD51.H. Once enabled, functions like printf and getchar communicate via the Serial Window. Since the UART is already configured for ISD51 communication, no additional initialization is required. In addition to the standard putchar ad _getkey functions, ISD51 also offers an _iskey function you may use to test for an available character to receive.