Lantronix XPort 사용자 설명서

5: GPIO Interface

XPort™ User Guide

Command 1Ah, Set Active Levels

Send:
2

parameters

Bytes 1-4: Mask

Bit X 1 means the direction for GPIO X will be updated with the value in the

second parameter.

0 means the active type for that GPIO will not change.

Bytes 5-8: New Active Levels

Bit X 1 means GPIO X will become active low.

0 means it will become active high.

Response:
1

parameter

Bytes 1-4: Updated active levels

Command 1Bh, Set States

Send:
2

parameters

Bytes 1-4: Mask

Bit X 1 means the state for GPIO X will be updated with the value in the

second parameter.

0 means the state for that GPIO will not change.

Bytes 5-8: New States

Bit X 1 means GPIO X will become active.

0 means it will become inactive.

Response:
1

parameter

Bytes 1-4: Updated states

Examples

Example 1:

PC sends command 1 to find out which configurable pins are

available as GPIO.

PC -> XPort: 10h, 00h, 00h, 00h, 00h, 00h, 00h, 00h, 00h
XPort -> PC: 10h, 03h, 00h, 00h, 00h

Command details:

10h = command 10h
00h, 00h, 00h, 00h = ignored
00h, 00h, 00h, 00h = ignored

Response details:

10h = response to command 10h
04h, 00h, 00h, 00h =

bits 0 and 1 are 0

→CP1 and CP2 are configured as GPIOs.

bit 2 is 1

→ CP3 is configured as either serial control or diagnostics.

The other bits are ignored because there are only three configurable pins on
the XPort.

Example 2: PC sends command 1Bh to change the current states of GPIO 0
and 1.

PC -> XPort: 1Bh, 01h, 00h, 00h, 00h, 00h, 00h, 00h, 00h
XPort -> PC: 1Bh, 05h, 00h, 00h, 00h