Host Protocols Direct Protocol CONTROL class IOs and UI GET GPIOS
April 13, 2023 at 2:39 AMGET_GPIOS
Role
Read the current status of the device’s GPIO pins.
Remark
Not all devices have GPIO pins. In this case, the response is empty.
Pay attention that the GPIO pins are likely to be multiplexed with the 4-LED ramp (see SET_LEDS).
Access condition
Free.
Command
| Field | Value |
|---|---|
| CLA | 58 (CONTROL) |
| INS | 15 |
Response
| Bytes | Content |
|---|---|
| 0-N | Current status of all GPIO pins (one byte per GPIO pin, empty if none) |
Values
Every byte takes one of the following values:
| Value | Explanation |
|---|---|
00 |
Pin is configured as input and input level is LOW |
01 |
Pin is configured as input and input level is HIGH |
80 |
Pin is configured as output and output level is set to LOW |
81 |
Pin is configured as output and output level is set to HIGH |
8F |
Pin is configured as a LED output |
Not any other value can be provided in the response.