LPC 2148 with UART 1

Development Boards MicroMod
1

I am currently facing issues with the LPC 2148 and the UART1. I am using the MAX3232 line driver to connect to the serial port on the PC.

I seem to have shorted the TX and RX pins on the LPC2148 while connecting it to the MAX3232. It serial connection is not working anymore.

IS there a way to find out if the issue is with the max3232 line driver or the LPC2148.

Thanks

Sumit

2

Use a loopback test, and look at the signals with a scope. That’ll show where the problem is.

Leon

3

leon_heller:
Use a loopback test, and look at the signals with a scope. That’ll show where the problem is.

Leon

Thank you for your help Leon. I was able to quickly identify thatthe Max3232 line driver is working fine using the loopback test.

But this means that the UART on LPC2148 is too fragile. Is this a general problem and what should I do to eliminate this issue next time. I use the LPC Header board from Olimex.

Best Regards,

Sumit

4

I’ve not seen anything on the LPC2000 group about the UARTs being fragile, and I’ve had no problems with them on the LPC2148. You might have a bad solder joint.

Leon

5

leon_heller:
I’ve not seen anything on the LPC2000 group about the UARTs being fragile, and I’ve had no problems with them on the LPC2148. You might have a bad solder joint.

Leon

I tried connecting to the transmitter pin directly an found that it still works. I will try figure out a way to get to the broken female header pin.

Many thank again.