Lantronix XPort XChip - User Guide - Page 74

Examples, GPIO Interface, XPort., XPort User Guide

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9: GPIO Interface Examples Example 1: PC sends command 10h 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 03h, 00h, 00h, 00h = bits 0 and 1 are 1 →CP1 and CP2 are configured as GPIOs. bit 2 is 0 → 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 74

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9: GPIO Interface
Examples
Example 1:
PC sends command 10h 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
03h, 00h, 00h, 00h
=
bits 0 and 1 are 1
→
CP1 and CP2 are configured as GPIOs.
bit 2 is 0
→
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
74