Pin pull-up/en: различия между версиями
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Текущая версия на 19:15, 24 апреля 2019
On some GPIOs, you can enable built-in pin pull-up for resistors to +3.3 V in the processor.
Here Device Tree:
pinctrl@80018000 { pinctrl-names = "default"; pinctrl-0 = <&hog_pins_a &pin_gpio_pu_0_2 &pin_gpio_pu_0_3 &pin_gpio_pu_0_4>; hog_pins_a: hog@0 { reg = <0>; fsl,pinmux-ids = < 0x2013 /* MX23_PAD_SSP1_DETECT__GPIO_2_1 */ 0x0113 /* MX23_PAD_GPMI_ALE__GPIO_0_17 */ >; fsl,drive-strength = <0>; fsl,voltage = <1>; fsl,pull-up = <0>; }; led_pin_gpio2_1: led_gpio2_1@0 { reg = <0>; fsl,pinmux-ids = < 0x2013 /* MX23_PAD_SSP1_DETECT__GPIO_2_1 */ >; fsl,drive-strength = <0>; fsl,voltage = <1>; fsl,pull-up = <0>; }; pin_gpio_pu_0_2: pin_gpio_pu_0_2@0 { reg = <0>; fsl,pinmux-ids = < 0x0023 /* MX23_PAD_GPMI_D02__GPIO_0_2 */ >; fsl,drive-strength = <0>; fsl,voltage = <1>; /* enable 47K pull-up for TB9 gpio */ fsl,pull-up = <1>; }; pin_gpio_pu_0_3: pin_gpio_pu_0_3@0 { reg = <0>; fsl,pinmux-ids = < 0x0033 /* MX23_PAD_GPMI_D03__GPIO_0_3 */ >; fsl,drive-strength = <0>; fsl,voltage = <1>; /* enable 47K pull-up for TB10 gpios */ fsl,pull-up = <1>; };
To turn off replace "fsl,pull-up = <1>;" with "fsl,pull-up = <0>" 23 / 10000 in the relevant block
List of GPIOs with pin pull-up
0-7
92
91
66
18-22 (10k)