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.. SPDX-License-Identifier: GPL-2.0+: gpio command ============ Synopsis -------- :: gpio <input|set|clear|toggle> <pin> gpio read <name> <pin> gpio status [-a] [<bank>|<pin>] The gpio command is used to access General Purpose Inputs/Outputs. gpio input ---------- Switch the GPIO *pin* to input mode. gpio set -------- Switch the GPIO *pin* to output mode and set the signal to 1. gpio clear ---------- Switch the GPIO *pin* to output mode and set the signal to 0. gpio toggle ----------- Switch the GPIO *pin* to output mode and reverse the signal state. gpio read --------- Read the signal state of the GPIO *pin* and save it in environment variable *name*. gpio status ----------- Display the status of one or multiple GPIOs. By default only claimed GPIOs are displayed. -a Display GPIOs irrespective of being claimed. bank Name of a bank of GPIOs to be displayed. pin Name of a single GPIO to be displayed or manipulated. Examples -------- Switch the status of a GPIO:: => gpio set a5 gpio: pin a5 (gpio 133) value is 1 => gpio clear a5 gpio: pin a5 (gpio 133) value is 0 => gpio toggle a5 gpio: pin a5 (gpio 133) value is 1 => gpio read myvar a5 gpio: pin a5 (gpio 133) value is 1 => echo $myvar 1 => gpio toggle a5 gpio: pin a5 (gpio 133) value is 0 => gpio read myvar a5 gpio: pin a5 (gpio 133) value is 0 => echo $myvar 0 Configuration ------------- The *gpio* command is only available if CONFIG_CMD_GPIO=y. The *gpio read* command is only available if CONFIG_CMD_GPIO_READ=y. Return value ------------ If the command succeds the return value $? is set to 0. If an error occurs, the return value $? is set to 1. |