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Original question:

CC3220SF-LAUNCHXL: GPIO interrupt is not getting Triggered

CC3220SF-LAUNCHXL: P45 not working as uart Rx

moshe jacobson18
Expert 2150 points
Part Number: CC3220SF-LAUNCHXL
Other Parts Discussed in Thread: CC3220S, SYSCONFIG, CC3220SF, CC3220R

Hi

i have 2xCC3220SF & 1xCC3220S launch pads 

i set P45 via sysconfig as the RX pin for uart2_0....on the CC3220S i have no problems with P45 operating correctly as Rx.

However, on the CC3220SF, the Rx side of the UART does not work & i have to use P04 which works fine (but i lose the use of a button).
I did populate R42 & removed L7 on the CC3220SFs so the track from the header pin to the MCU pin is connected.
On the scope I do see that when i send a signal P45 remains high so obviously its not working as a UART pin (or GPIO for that matter).
The UART going via the XDS is disabled via sysconfig.

Is there anything that i can do to rectify this so as to be able to use P45?.

thanks in advance.
moshe

  • +1
    Guru 78485 points

    Hi moshe,

    At CC3220SF you cannot use pin P45 as user pin. This pin is used for powering internal flash. You cannot do anything with this.

    Jan

  • 0 in reply to Jan D
    Expert 2150 points

    Hi Jan

    Now thats very interesting. Where do TI mention that?

  • 0 in reply to moshe jacobson18
    Guru 78485 points

    Hi,

    Datasheet for CC3220SF, design checklist SWRU462...

    Jan

  • 0 in reply to Jan D
    Expert 2150 points

    Thanks Jan.

    Ahh...relooked at the datasheet in light of what you wrote.

    This is from page 13 in datasheet SWAS035C – SEPTEMBER 2016 – REVISED MAY 2021.
    "Pin 45 is used by an internal DC/DC converter (ANA2_DCDC). This pin will be available automatically if the serial flash is forced in the
    CC3220SF device. For the CC3220R and CC3220S devices, pin 45 can be used as GPIO_31 if a supply is provided on pin 47"

    1. What the heck is meant by "if the serial flash is forced"? 
    2. Is there a way to exclude the flash provided by the 3220SF so that its like the 3220S??

  • 0 in reply to moshe jacobson18
    Guru 78485 points

    Hi,

    Usage of pin P45 as user pin is not supported at SF devices and devices are not intended for such use case.

    Jan