topic Re: RS232 connection not working in i.MX Processors

RS232 connection not working

MarkoPanger — Thu, 15 Dec 2011 09:08:45 GMT

Hi all,

I've just received the i.MX53 QSB board. I've inserted the supplied SD card, and RS232 cable and power up the board. I can see uboot booting and counting down 3s before booting up the kernel.

Unfortunately I can't prevent uboot from booting the kernel as uboot doesn't accept any input from my keyboard. I'm using minicom. I'm sure my connection to PC is working fine as if I just swap the 53QSB board for a i.mx51 EVK it works as it should.

The same happens if I let the kernel boot up. When it comes to entering the username and password I just can't enter anything through the RS232 connection.

Is this a know issue with i.mx53QSB ?

Thanks, Marko

Re: RS232 connection not working

MarkoPanger — Thu, 15 Dec 2011 09:49:32 GMT

Got it working. It was a soldering problem on the connector. Thank, Marko.

Re: RS232 connection not working

AlanLevy — Thu, 15 Dec 2011 09:54:42 GMT

The RS232 interface on the QSB should work in both directions. You should check that you've got the right RS232 cable and that minicom is configured correctly - in particular there's no hardware handshaking.