receive 0 data from UART.....

[wingbar]

Hi,
I try to read data from read buffer through UART, and the result I received is 0hex, no matter what value I send out.
Does anyone know what is the problem ?
thanks ....

 

[wingbar]

Is there possibility that it is caused by the clock ?

 

[Nigel Goodwin]

You don't give anywhere near enough information, we don't have a clue what you are using or trying to do. For a start, is it a PC?, or is it a micro-controller?. In either case, is it wired correctly?, is it set up correctly?, and are you using it correctly?.

 

[mugzzzzy]

hi,
maybe u didnt initialize it properly ...like a software program that enables transmit and receive bits in one of the uart registers,,,,,

what context are u using the uart??

 

[wingbar]

The detailed web site about my project is :
www.web-ee.com/Electronic-Projects/projects/chiptester/index.shtml


I'm using MSComm Control to send some bytes to the UART, then the decoder circuit will clock the appropriate bits into the Write buffer(74LS75), so that I can control the voltage level on each pin of my ZIF socket. After that, I will send 70hex to read the data(logic values) back to my computer.
but, all the while I keep getting either "0" or "FF" when I send 70h to my read buffer.
Any idea ?

 

[Nigel Goodwin]

The detailed web site about my project is :
www.web-ee.com/Electronic-Projects/projects/chiptester/index.shtml

For a start, does your hardware work with the original software?. If it doesn't you probably have a hardware fault, if it does the fault is most likely in your software.