RM44L520: Issue Configuring Pull Up Resistor

Andrew Mercer

Part Number: RM44L520
Other Parts Discussed in Thread: HALCOGEN

Hello,

I've been having a bit of trouble properly configuring a pullup resistor in halcogen. I have set the direction of the pins that are in use to input in halcogen, selected the pull up resistor for each of the GIO pins in use, set all of the PULDIS bits high for their corresponding GIO pins (I did not see a way to do this in halcogen) to enable the pull up resistors, and I am using the gioGetBit function to pull the current pin value. For some reason this value is always 0 which makes me think the pull up resistor is not configured properly. Is there some step that I am missing?

Thanks

over 3 years ago

+1 QJ Wang over 3 years ago

TI__Guru**** 196346 points

Andrew Mercer said:
PULDIS bits high for their corresponding GIO pins

The pull-up and pull-down functionality is disabled

What is value of PSEL register?

GIOPSL[n] = 0 --> pull down is select when PULDIS[n]=0 (enabled)
GIOPSL[n] = 0 --> pull up is select when PULDIS[n]=0 (enabled)

0 Andrew Mercer over 3 years ago in reply to QJ Wang

Prodigy 170 points

Thanks, I just had the logic backwards.

0 Andrew Mercer over 3 years ago in reply to QJ Wang

Prodigy 170 points

I am actually have a similar issue again enabling the pull up resistor on one of the N2Het Pins. I checked that all bits in the PULDIS register for the N2Het are all low and selected the pull up resistor for the N2Het pin that I am trying to configure in halcogen and it doesn't seem to be working. Any idea why this might be the case?

0 QJ Wang over 3 years ago in reply to Andrew Mercer

TI__Guru**** 196346 points

Hi Andew,

1. make sure the pinmux is configured properly

2. The HR share, AND share, and XOR share should not be enabled:

0 Andrew Mercer over 3 years ago in reply to QJ Wang

Prodigy 170 points

Thanks for the response. I added checked those settings and they are the same on my build. We did add a hardware pull up resistor and I am having the same issue pulling the information from that pin so I believe I am using the wrong function to pull the value of the pin. I was under the impression that to pull IO values from an N2Het configured as IO, you are supposed to use the gioGetBit function passing hetREG1 and the index value as arguments. Is this not the correct way of doing this?

Thanks

0 Andrew Mercer over 3 years ago in reply to Andrew Mercer

Prodigy 170 points

I found the issue, I was passing hetREG1 when I was supposed to pass hetPORT1. Thanks for the help.

Arm-based microcontrollers

Arm-based microcontrollers forum

RM44L520: Issue Configuring Pull Up Resistor