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9: GPIO Interface
Command 19h, Set Directions
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 direction for that GPIO will not change.
Bytes 5-8: New Directions
Bit X
1 means GPIO X will become an output.
0 means it will become an input.
Response:
1 parameter
Bytes 1-4: The updated directions
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 10h to find out which configurable pins are
available as GPIO.
PC -> xPico: 10h, 00h, 00h, 00h, 00h, 00h, 00h, 00h, 00h
xPico -> PC: 10h, 03h, 00h, 00h, 00h
Command details:
xPico User Guide 65