TM4C1294NCPDT PK7 pin

Hi Jonny,

     Post more of your code, including setting up of system clock.

     How do you test output of PK7, through LED or just by debugging?

- kel

Hi kel,

     I only use these code and through  multimeter to test the output pin.

Jonny Xiao said:

GPIOPinWrite(GPIO_PORTK_BASE, 0xFF, 0);
GPIOPinWrite(GPIO_PORTK_BASE, 0xFF, 0xFF);
GPIOPinWrite(GPIO_PORTM_BASE, 0xFF, 0);
GPIOPinWrite(GPIO_PORTM_BASE, 0xFF, 0xFF);

I have not tried code without system clock setup. 

Lets say this code works. Are you stepping line by line of the code while checking PK7 output using multimeter?

Do you encounter same problem with other port pins?

- kel

Yes, other pins PK0 ~ PK6 are normal. 

PK7 can be set as following

Hello Jonny

Is this a custom board or a EK-TM4C129 Connected LaunchPad?

Regards

Amit

Hello Amit，

My development board is customized. I only have a EK-LM4F232 demo board.

Amit Ashara said:

Is this a custom board?

Amit/I think along similar pathways...(while performing general MCU diagnostics)

Other poster's System Clock issue seems minor as "all other" Ports/Pins perform.

Thus - if PK7 is not "burdened" by any special function "defaults" - I'd bet on: bad connection, short or low impedance path to ground - PK7's trace.

As always - building ONE board proves, "Very FALSE economy!"  If the same issue continues across multiple boards the chance of, "single board anomaly" greatly reduces.  Your test of any such 2nd boards would be useful...

And - insure that any/all "external connections" which may impact PK7 have been removed...

Hello Jonny,

You may want to check the trace from the TM4C129 pin to the test point. That will make sure if there is a loose solder. Also do check if there is a Cap or other device on the path.

Regards

Amit

Hello Amit,

I am sure the path has no anything.

Jonny Xiao said:

path has no anything.

Was that same, "No anything" the entire past condition, too?  (i.e. might that pin have been damaged?)

Do you bring that pin out to a header/connector?

And - how do you arrive @, "No anything?"  Have you ohm'ed out that pin - both to Gnd & to Vdd & to "adjacent pins?  (and recently)

Last gasp - might you be probing the wrong pin?  (Not being mean/dismissive here - if pin count is high we've seen clients (and ourselves) consistently mis-count...)