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Turn on the internal pull up of UART0_TX.

SHU LIU
Intellectual 570 points

Hi,

we want to turn on the internal pull of UART0_TX. We changed the device tree as below.

am335x-bone-common.dtsi

uart0_pins: pinmux_uart0_pins {
pinctrl-single,pins = <
0x170 (PIN_INPUT_PULLUP | MUX_MODE0) /* uart0_rxd.uart0_rxd */
0x174 (PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* uart0_txd.uart0_txd */

0x174 (PIN_OUTPUT_PULLUP | MUX_MODE0) /* uart0_txd.uart0_txd */
>;
};

We re-compiled the boneblack.dtb and applied the file. However, the voltage on the UART0_tx is still 0v.

Am I missing something here? If somebody can answer it, I would really appreciate it.

Regards,

Shu