USB-I/O Interface Adapter GPIO-24. Programmer's Reference Manual.
8.6. GPIO_GET_CMP_VAL (0x22)
The GPIO_EV_CMP event can be generated for either of the comparators. The event can be sent:
when the comparison results change;
periodically with the predefined repeat interval.
For more detailed information see Section 8.3, “Comparator module event”.
| Byte 0 | GPIO_EV_CMP | Event ID (0x84). |
| Byte 1 | CNT | CNT byte value is incremented each time after the event arises. |
| Byte 2 | CMP0_OUT | Result of comparison for CMP0 comparator. |
| Byte 3 | CMP1_OUT | Result of comparison for CMP1 comparator. |
| Byte 4 | EVENT_COND0 | Condition of sending the event for CMP0 comparator. |
| Byte 5 | EVENT_COND1 | Condition of sending the event for CMP1 comparator. |
| Byte 6..7 | Reserved | Reserved |
Event is an 8-byte array of the following format:
- Byte 0: GPIO_EV_CMP (0x84)
Event ID (event type). This byte will contain 0x84.
- Byte 1: CNT
CNT byte value is incremented each time after the GPIO_EV_CMP event arises.
- Byte 2: CMP0_OUT
The result of comparison for CMP0 comparator. This byte contains valid data only if Byte 4: EVENT_COND0 is not GPIO_CMP_EV_NONE (0x00).
The comparator output can be inverted with Bit 5: CMP0_INV in Byte 2: CMP_CFG of GPIO_SET_CMP_CFG command.
If CMP0_INV = 0:
If CMP0_INV = 1:0, if VIN+ < VIN-;
1, if VIN+ > VIN-.
0, if VIN+ > VIN-;
1, if VIN+ < VIN-.
- Byte 3: CMP1_OUT
The result of comparison for CMP1 comparator. This byte contains valid data only if Byte 5: EVENT_COND1 is not GPIO_CMP_EV_NONE (0x00).
The comparator output can be inverted with Bit 4: CMP1_INV in Byte 2: CMP_CFG of GPIO_SET_CMP_CFG command.
If CMP1_INV = 0:
If CMP1_INV = 1:0, if VIN+ > VIN-;
1, if VIN+ < VIN-.
0, if VIN+ < VIN-;
1, if VIN+ > VIN-.
- Byte 4: EVENT_COND0
This byte contains the current event for CMP0 comparator. The following events are possible:
- GPIO_CMP_EV_NONE (0x00)
The CMP0 comparator has not taken part in generation of the event. Data, stored in Byte 2: CMP0_OUT, is not valid.
- GPIO_CMP_EV_CHANGE (0x01)
The event is sent because CMP0 comparator output value has changed.
- GPIO_CMP_EV_ALWAYS (0x02)
The event is sent periodically with the predefined repeat interval.
- Byte 5: EVENT_COND1
This byte contains current event for CMP1 comparator. The following events are possible:
- GPIO_CMP_EV_NONE (0x00)
The CMP1 comparator has not taken part in generation of the event. Data, stored in Byte 3: CMP1_OUT, is not valid.
- GPIO_CMP_EV_CHANGE (0x01)
The event is sent because CMP1 comparator output value has changed.
- GPIO_CMP_EV_ALWAYS (0x02)
The event is sent periodically with the predefined repeat interval.
- Bytes 6..7: Reserved
These bytes are reserved for future usage.
For convenience GPIO_EV_CMP structure is declared in reports.h file.
