ColdFire/68K Microcontrollers and ProcessorsのトピックRe: MCF5225X Tower - serial communication

MCF5225X Tower - serial communication

Paleantrop — Tue, 15 Mar 2011 15:27:01 GMT

Hello,

I've just started the Tower kit and I am trying to run the "Hello" project from MQX. The problem is that I can connect to tower, I can flash the program, but I get nothing on Terminal window (using a straight cable from my computer to RS232 connector - which is placed on the below board). I'm not sure if everything is set up, because independently on which project I run, I can not see anything in terminal window.

Some help, please ?

Thank you

Re: MCF5225X Tower - serial communication

TomE — Fri, 18 Mar 2011 18:57:29 GMT

Put an oscilloscope on what you think is the transmit data pin. You should see the board trying to transmit.

If you don't have a CRO, slow the baud rate down as much as you can and put a LED on it.

Then put the CRO on the RX pin and see if the terminal program transmits on there. Compare the bit widths.

Make sure you don't have two driven pins connected together (TX connected to TX etc).

Make sure the terminal program is configured with no flow control. It may be set to want the other signals (CTS, DTR and the like).

Does the Tower board provide these signals? Are they not-connected, driven from the chip or driven from pullup resistors?

The DB9 connector has three pins you care about. The other ones are there to cause trouble.

Try shorting TX to RX on the cable and see if the terminal program with display what you type (testing it and the cable by using a loopback).

Tom

Re: MCF5225X Tower - serial communication

Paleantrop — Fri, 18 Mar 2011 19:03:26 GMT

Thanks for your answer Tom. Meanwhile I have connected to RS232 connector from the Controller Board and I've been able to use it.

Re: MCF5225X Tower - serial communication

mjbcswitzerland — Sun, 20 Mar 2011 19:43:20 GMT

The UART on the serial card should work normally as long as the UART is set to UART1 (UB port configuration and not QS configuration).

Regards

Mark