U-Boot GPIO Driver
Table of Contents
Introduction
This page gives the information about the GPIO drivers in u-boot.
Table of Contents
U-boot Configuration
To enable GPIO in u-boot, the following configurations need to be enabled
| Code Block |
|---|
|
CONFIG_DM_GPIO=y
CONFIG_ZYNQ_GPIO=y
CONFIG_CMD_GPIO=y
|
Test Procedure
Command Line:
It’s a simple way to access the GPIO from the command line.
Following commands need to run on the u-boot console:
| Code Block |
|---|
|
Gpio status -a
Gpio input <gpio_num>
Gpio set <gpio_num>
Gpio clear <gpio_num>
Gpio toggle <gpio_num> |
ZynqMPZynq Ultrascale+
- 78 GPIO signals for device pins
- Routed through the MIO multiplexer.
- Outputs are 3-state capable.
- 288 GPIO signals between the PS and PL through the EMIO interface
- 96 inputs.
- 192 outputs (96 true outputs and 96 output enables).
- The function of each GPIO can be dynamically programmed on an individual or group basis.
- Enable, bit or bank data write, output enable and direction controls.
- Programmable interrupts on individual GPIO basis
- Status read of raw and masked interrupt.
- Selectable sensitivity: Level-sensitive (High or Low) or edge-sensitive (positive,negative, or both).
Zynq-7000
- 54 GPIO signals for device pins
- Routed through the MIO multiplexer.
- Outputs are 3-state capable.
- 192 GPIO signals between the PS and PL via the EMIO interface
- 64 Inputs
- 128 Outputs(64 true outputs and 64 output enables).
- The function of each GPIO can be dynamically programmed on an individual or group basis.
- Enable, bit or bank data write, output enable and direction controls.
- Programmable interrupts on individual GPIO basis
- Status read of raw and masked interrupt.
- Selectable sensitivity: Level-sensitive (High or Low) or edge-sensitive (positive,negative, or both).