USB-I/O Interface Adapter GPIO-24. Programmer's Reference Manual.
12.1. GPIO_SET_PULL_UPS (0x19)
The GPIO_GET_PULL_UPS command allows to retrieve the state (on/off) of the weak pull-up resistors.
GPIO_GET_PULL_UPS Command
| Byte 0 | GPIO_GET_PULL_UPS | Command ID (0x1A). |
| Byte 1 | ECHO | Echo to associate a command with the response. |
| Byte 2..7 | Reserved | Reserved (must be 0). |
Command is an 8-byte array of the following format:
- Byte 0: GPIO_GET_PULL_UPS (0x1A)
This byte contains command ID (command type). It should be set to 0x1A.
- 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.
- Bytes 2..7: Reserved
These bytes are reserved for future usage and must be set to 0.
For convenience GPIO_GET_PULL_UPS_CMD structure is declared in reports.h file.
GPIO-24 adapter sends GPIO_GET_PULL_UPS response after command execution. The weak pull-ups state (on/off) is specified inside the response.
GPIO_GET_PULL_UPS Response
| Byte 0 | GPIO_GET_PULL_UPS | Response ID (0x1A). |
| Byte 1 | ECHO | Echo to associate a command with the response |
| Byte 2 | ST | Status of the command execution |
| Byte 3 | PINS_GROUP1 | State (on/off) of the weak pull-ups for the first group of pins |
| Byte 4 | PINS_GROUP2 | State (on/off) of the weak pull-ups for the second group of pins |
| Byte 5..7 | Reserved | Reserved |
Response is an 8-byte array of the following format:
- Byte 0: GPIO_GET_PULL_UPS (0x1A)
This byte contains response ID (response type). This byte will contain 0x1A.
- 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 (0x00) – The weak pull-ups configuration was successfully retrieved.
- Byte 3: PINS_GPOUP1
The state of the weak pull-ups for the first group of pins (A0, A1, A2, A3, A4, B0, B1, B4):
1 – weak pull-up resistors are enabled for the group of pins;
0 – weak pull-up resistors are disabled for the group of pins.
- Byte 4: PINS_GROUP2
The state of the weak pull-ups for the second group of pins (A6, A7, B7, C0, C7):
1 – weak pull-up resistors are enabled for the group of pins;
0 – weak pull-up resistors are disabled for the group of pins.
- Bytes 5..7: Reserved
These bytes are reserved for future usage.
For convenience GPIO_GET_PULL_UPS_RSP structure is declared in reports.h file.
