GPIO value doesn't change

[mathew_k_t]

Hi,

I was configuring some of the I2C pins(Sound and camera) in the header as GPIO (GPIO1_IO30 and GPIO1_IO31), i.e: GPIO30 and GPIO31 in console. So I disabled sound and camera, reconfigured pins as GPIO.

                  MX6UL_PAD_UART5_RX_DATA__GPIO1_IO31       0x000010B0
                  MX6UL_PAD_UART5_TX_DATA__GPIO1_IO30       0x000010B0

But the value doesn't get changed. What's the error in it? Or these pins have any other control other than device tree.

[BiyongSUN · Accepted solution]

 you can add the 0x40000000 to set the SION to try.              

                  MX6UL_PAD_UART5_RX_DATA__GPIO1_IO31       0x400010B0
                  MX6UL_PAD_UART5_TX_DATA__GPIO1_IO30       0x400010B0

[CarlosCasillas]

Hi Mathew,

Once pins are configured as GPIO, you could also use them with /sys/class/gpio/

You could take a look at the following document:

https://community.nxp.com/docs/DOC-329735

Hope this will be useful for you.

Best regards!

/Carlos

-----------------------------------------------------------------------------------------------------------------------
Note: If a post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[BiyongSUN]

If you read the reference manual carefully, you should know about SION bit.

Please set it and check again.

please refer to the following link and search SION.

Simple GPIO Example - quandry
https://community.nxp.com/message/598834#598834