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5: GPIO Interface
XPort™ User Guide 48
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