GPO

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Syntax

lager gpo [NETNAME] LEVEL [OPTIONS]

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Arguments

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Level Values

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Options

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Usage

# Set pin high
lager gpo LED1 high --box my-lager-box

# Set pin low
lager gpo LED1 low

# Toggle pin state
lager gpo LED1 toggle

# Using numeric values
lager gpo LED1 1
lager gpo LED1 0

# List available GPIO nets (omit net name and level)
lager gpo --box my-lager-box

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Hold Mode

# The level stays until the next command changes it
lager gpo RESET_N low --box my-lager-box
lager gpo RESET_N high --box my-lager-box

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Supported Hardware

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LabJack U3 Pins

• FIO0-FIO3 are not offered as gpio channels. On a U3-HV they are fixed high-voltage analog inputs.
• Lager treats every U3 as a U3-HV, so a U3-LV also loses these four digital lines.
• A write sets the pin to digital mode and to output.
• A gpio net saved on FIO0-FIO3 before version 0.46.1 still lists, but fails when you use it. Delete that net.

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Aardvark Pin Mapping

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FT232H Pin Mapping

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Examples

# Control an LED
lager gpo LED1 on --box my-lager-box
sleep 1
lager gpo LED1 off --box my-lager-box

# Toggle reset line
lager gpo RESET_N low
sleep 0.1
lager gpo RESET_N high

# Blink pattern
for i in {1..5}; do
    lager gpo LED1 toggle
    sleep 0.5
done

# Assert a boot strap, flash, then release it
lager gpo BOOT0 high --box my-lager-box
lager debug flash --hex fw.hex --box my-lager-box
lager gpo BOOT0 low --box my-lager-box

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Related Commands

• lager gpi - Read GPIO input state

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Notes

• GPO is for setting output pins only
• Use lager gpi to read input pins
• Default net can be set with lager defaults add --gpio-net
• Pin must be configured as output in net configuration
• Toggle reads current state and inverts it
• USB-202 channels are DIO0-DIO7
• --hold has no effect; it prints a note and exits
• The command sets the output level and exits immediately; the pin retains its state until the next command