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GPIO Interface

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

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

Command details:

1Bh = command 1Bh

01h, 00h, 00h, 00h = the mask that determines which GPIOs will be changed.

bit 0 is 1 → GPIO0 will be changed.

bit 1 is 0 → GPIO1 will remain the same.

00h, 00h, 00h, 00h = the new states

bit 0 is 0 → GPIO0 will become 0.

bit 1 is ignored since it is masked out.

Response details:

1Bh = response to command 1Bh

05h, 00h, 00h, 00h =

bit 0 is 1 → GPIO0 = 1

bit 1 is 0 → GPIO1 = 0

bit 2 is 1 → GPIO2 = 1

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

the

XPort.

XPort™ User Guide 5-5

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Lantronix XPort Bedienungsanleitung Seite 53