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_PIN_CFG (0x2D)

This byte contains command ID (command type). It should be set to 0x2D.

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_PIN_CFG (0x2D)

Response ID (response type). This byte will contain 0x2D.

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: ST

Status of the command execution:

• GPIO_ST_SUCCESS (0x0) – The I/O pin configuration settings were successfully retrieved;

• GPIO_ST_INVALID_GPIO (0x2) – 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: CFG

CFG byte contains configuration settings for 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. Byte 5: EXTENDED_CFG contains extended configuration settings;

• GPIO_CFG_ADC (0x4) – I/O pin is used as an analog input by ADC module. Byte 5: EXTENDED_CFG contains extended configuration settings;

• GPIO_CFG_CMP (0x5) – I/O pin is used by comparator module. Byte 5: EXTENDED_CFG 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.

Byte 5: EXTENDED_CFG

EXTENDED_CFG byte contains extended configuration settings for a specific pin. The following values are supported:

Extended configuration settings for pins used by the comparator module (these settings are available only when Byte 4: CFG contains GPIO_CFG_CMP (0x5) value):

• GPIO_CFG_CMP_IN_MINUS (0x0) – I/O pin is configured as V_IN- comparator analog input;

• GPIO_CFG_CMP_IN_PLUS (0x1) – I/O pin is configured as V_IN+ comparator analog input;

• GPIO_CFG_CMP_OUT (0x2) – I/O pin is configured as comparator digital output;

• GPIO_CFG_CMP_NC (0x3) – I/O is not connected to a comparator;

• GPIO_CFG_CMP_VREF_HIGH (0x4) – I/O pin is configured as High Level Reference Voltage input;

• GPIO_CFG_CMP_VREF_LOW (0x5) – I/O pin is configured as Low Level Reference Voltage input;

• GPIO_CFG_CMP_OUT_VREF (0x6) – I/O pin is configured as Comparator Voltage Reference Voltage Module output.

Extended configuration settings for for pins used by ADC module (these settings are available only when Byte 4: CFG contains GPIO_CFG_ADC (0x4) value):

• GPIO_CFG_ADC_IN (0x0) – I/O pin is configured as ADC analog input;

• GPIO_CFG_ADC_VREF_HIGH (0x1) – I/O pin is configured as High Level Reference Voltage input;

• GPIO_CFG_ADC_VREF_LOW (0x2) – I/O pin is configured as Low Level Reference Voltage input.

Extended configuration settings for pins used to send single pulses (these settings are available only when Byte 4: CFG contains GPIO_CFG_PULSE (0x3) value):

• GPIO_CFG_PULSE_ACTIVE (0x00) – I/O pin is sending a single pulse at the moment;

• GPIO_CFG_PULSE_IDLE (0x01) – I/O pin is configured to send single pulses, but it is not sending a pulse at the moment.

Bytes 6..7: Reserved

These bytes are reserved for future usage.