Problem with AX-12+ in Half Dublex UART
Problem with AX-12+ in Half Dublex UART
by ak_1371
Thu Feb 19, 2009 12:56 pm
Dear Sir or Miss,
I have a problem with AX-12+ in half dublex Uart.I have used an ATmega 32 instead of CM-5 and a buffer & inverter for it as said in the PDF.It works correctly but after 3 or 4 instructions it has no response to the isnstructions e.g. the code sais to turn on and off the LED every 2 seconds.it is done for only 3 times and after that LED remains on.and i think that there is no problem with the ATmega32.
Please Help me!!!
I have a problem with AX-12+ in half dublex Uart.I have used an ATmega 32 instead of CM-5 and a buffer & inverter for it as said in the PDF.It works correctly but after 3 or 4 instructions it has no response to the isnstructions e.g. the code sais to turn on and off the LED every 2 seconds.it is done for only 3 times and after that LED remains on.and i think that there is no problem with the ATmega32.
Please Help me!!!
by StuartL
Thu Feb 26, 2009 5:09 pm
This sounds most likely to be a software bug. Have you put debugging in your ATmega32 to output debugging to another port? Even if it's just an LED you can (with some imagination) come up with on/off and flashing sequences to indicate which part of the software you've got to.
The AX-12 is very sensitive to bad data on the bus and can take some time to resync after bad frames. It's worth programming another ATmega32 as a bus-sniffer and get it to output the frames to some other device (e.g. your PC?) so you can see what's actually occurring on the wire.
The AX-12 is very sensitive to bad data on the bus and can take some time to resync after bad frames. It's worth programming another ATmega32 as a bus-sniffer and get it to output the frames to some other device (e.g. your PC?) so you can see what's actually occurring on the wire.
