New product - USB-SPI Interface Adapter SPI-10
USB-IO Interface Adapter GPIO-24. Programmers Reference Manual.
| Byte 0 | Byte 1 | Byte 2 | Byte 3 | Byte 4 | Byte 5 | Byte 6 | Byte 7 |
|---|---|---|---|---|---|---|---|
| GPIO_ GET_VAL (0x09) | ECHO | 0 | 0 | 0 | 0 | 0 | 0 |
The GPIO_GET_VAL command retrieves levels present on the I/O pins:
- For input pins the current input value is retrieved.
- For output pins the current output value is retrieved.
- For pulse width modulation (PWM) pins the current output value is retrieved.
- For pins executing a single pulse the current output value is retrieved.
Command is an 8-byte array of the following format:
- Byte 0: GPIO_GET_VAL (0x09)
- This byte contains command identifier (command type). It should be set to 0x09.
- Byte 1: ECHO
- This byte can be used to associate a response received from GPIO-24 adapter with specific command. Response will contain exactly the same value in its echo byte.
- Byte 2..7: Reserved
- These bytes are reserved for future use and have to be set to 0.
For convenience GPIO_GET_VAL_CMD structure is declared in reports.h file:
typedef struct _GPIO_GET_VAL_CMD
{
unsigned char id; // = GPIO_GET_VAL;
unsigned char echo;
unsigned char reserved[6]; // must be 0
} __PACKED_ATTR GPIO_GET_VAL_CMD, *PGPIO_GET_VAL_CMD;
GPIO-24 adapter sends GPIO_GET_VAL response after command execution. The I/O values are specified inside the response.
3.1.8. GPIO_GET_PWM_CFG
