USB-I/O Interface Adapter GPIO-24. Programmer's Reference Manual.

Command is an 8-byte array of the following format:

Byte 0: GPIO_GET_IN_CFG (0x06)

This byte contains command ID (command type). It should be set to 0x06.

Byte 1: ECHO

This byte is used to associate a response received from GPIO-24 adapter with a specific command. Response will contain exactly the same value in its echo byte.

Byte 2: GPIO

GPIO pin number:

• 0..7 corresponds to GPIO PORT A pins 0..7

• 8..15 corresponds to GPIO PORT B pins 0..7

• 16..23 corresponds to GPIO PORT C pins 0..7

Bytes 3..7: Reserved

These bytes are reserved for future usage and must be set to 0.

Response is an 8-byte array of the following format:

Byte 0: GPIO_GET_IN_CFG (0x06)

Response ID (response type). This byte will contain 0x06.

Byte 1: ECHO

Echo byte copied from the corresponding command. It is used to associate the response with the specific command.

Byte 2: ST

Status of the command execution:

• GPIO_ST_SUCCESS (0x00) – The I/O pin input mode configuration settings were successfully retrieved.

• GPIO_ST_INVALID_GPIO (0x02) – Invalid I/O pin number has been specified.

Byte 3: GPIO

GPIO pin number:

• 0..7 corresponds to GPIO PORT A pins 0..7

• 8..15 corresponds to GPIO PORT B pins 0..7

• 16..23 corresponds to GPIO PORT C pins 0..7

Byte 4: PHASE

Phase configuration, which determines the conditions when GPIO-24 adapter sends GPIO_EV_IN event.

The following values are available for this byte:

• GPIO_IN_EV_NONE (0x00) – No events are sent for current pin. For more detailed information see Section 6.2.1, “GPIO_IN_EV_NONE (0x00) – No events are sent”.

• GPIO_IN_EV_LEV_0 (0x01) – Events are sent when pin has logical "0" on its input. For more detailed information see Section 6.2.2, “GPIO_IN_EV_LEV_0 (0x01) – Sending events when pin has logical "0" on its input”.

• GPIO_IN_EV_LEV_1 (0x02) – Events are sent when pin has logical "1" on its input. For more detailed information see Section 6.2.3, “GPIO_IN_EV_LEV_1 (0x01) – Sending events when pin has logical "1" on its input”.

• GPIO_IN_EV_RISING (0x03) – Events are sent when input value changes from logical "0" to "1". For more detailed information see Section 6.2.4, “GPIO_IN_EV_RISING (0x03) – Sending events when input value changes from logical "0" to "1"”.

• GPIO_IN_EV_FALLING (0x04) – Events are sent when input value changes from logical "1" to "0". For more detailed information see Section 6.2.5, “GPIO_IN_EV_FALLING (0x04) – Sending events when input value changes from logical "1" to "0"”.

• GPIO_IN_EV_CHANGE (0x05) – Events are sent when input value of the pin changes. For more detailed information see Section 6.2.6, “GPIO_IN_EV_CHANGE (0x05) – Sending events when input value of the pin changes”.

Byte 5: DEBOUNCE

To avoid sending numerous events caused by contact bounce, GPIO-24 adapter accepts signal change only after the new value is stable. Byte 5: DEBOUNCE contains the debounce time in ms. If Byte 5: DEBOUNCE = 0, the debounce check is not carried out.

Byte 6: REPEAT

Byte 6 defines the repeat interval in units of 100 ms for the event GPIO_EV_IN generation. Byte 6: REPEAT is used for pins with phase configuration set to GPIO_IN_EV_LEV_0 or GPIO_IN_EV_LEV_1. It is ignored for pins with other phase configurations. If Byte 6: REPEAT is non-zero , GPIO-24 adapter sends events each REPEAT*100 ms. For more detailed information see Section 6.1, “Digital Input Event”.

Byte 7: Reserved

This byte is reserved for future usage.