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Serial i/o programming using keil c

Willy Sum

Hi. I'm working on a project involving a java program and the micro controller NXP P89v664.

The java program which utilises the RXTX package, outputs to the serial port a string of characters to be deciphered by the micro controller.

My java program is completed and outputs correctly as checked by virtual com ports and a c program.

I have written a keil c program to receive the input but I somehow receive random inputs instead.

I used the _getkey() fuction to receive the input and putchar() function to check the output.

I'm new to keil c can anyone shed some light on this pls?

Thanks.

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  • 0 in reply to Andy Neil

    Hi. I dont think i have done the oscilloscope test correctly. I only get 50Hz at the output.

    Anyway I am able to get the correct echo of the characters after i transferred the hex file without pressing the reset button on the microcontroller.

    After pressing the reset button, I get the funny characters as shown above.

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  • 0 in reply to Andy Neil

    Hi. I dont think i have done the oscilloscope test correctly. I only get 50Hz at the output.

    Anyway I am able to get the correct echo of the characters after i transferred the hex file without pressing the reset button on the microcontroller.

    After pressing the reset button, I get the funny characters as shown above.

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