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_CFG (0x02)

This byte contains command ID (command type). It should be set to 0x02.

Byte 1: ECHO

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

Byte 2: PORT

GPIO PORT:

• 0 – GPIO PORT A

• 1 – GPIO PORT B

• 2 – GPIO PORT C

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_CFG (0x02)

Response ID (response type). This byte will contain 0x02.

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 GPIO port configuration settings were successfully retrieved;

• GPIO_ST_INVALID_PORT (0x03)- Invalid port number has been specified.

Byte 3: PORT

GPIO PORT:

• 0 – GPIO PORT A;

• 1 – GPIO PORT B;

• 2 – GPIO PORT C.

Byte 4..7: PINS

Each nibble of bytes 4-7 contains configuration settings of a specific pin. The following values are supported:

• GPIO_CFG_IN (0x0) – I/O pin is configured as a digital input;

• GPIO_CFG_OUT (0x1) – I/O pin is configured as a digital output;

• GPIO_CFG_PWM (0x2) – I/O pin is configured for PWM (Pulse Width Modulation) output;

• GPIO_CFG_PULSE (0x3) – I/O pin is configured to send single pulses. Use GPIO_GET_PIN_CFG command to retrieve settings for current pin. Byte 5 of the GPIO_GET_PIN_CFG response contains extended configuration settings;

• GPIO_CFG_ADC (0x4) – I/O pin is used by ADC module. Use GPIO_GET_PIN_CFG command to retrieve settings for current pin. Byte 5 of the GPIO_GET_PIN_CFG response contains extended configuration settings;

• GPIO_CFG_CMP (0x5) – I/O pin is used by comparator module. Use GPIO_GET_PIN_CFG command to retrieve settings for current pin. Byte 5 of the GPIO_GET_PIN_CFG response contains extended configuration settings;

• GPIO_CFG_FR_CNT (0x6) – I/O pin is used by frequency counter;

• GPIO_CFG_PLS_CNT (0x7) – I/O pin is used by pulse counter;

• GPIO_CFG_HPWM (0x8) – I/O pin is configured for HPWM (High Frequency Pulse Width Modulation) output;

• GPIO_CFG_NOT_CONFIGURED (0xf) – I/O pin is not configured.