Inter integrated circuit-based communication method and apparatus
An inter integrated circuit (I 2 C)-based communication method incudes when an I 2 C signal is encapsulated into a data packet for transparent transmission, an I 2 C status is indicated by a first field in a packet header of the data packet. The data packet may have no load part, or the data packet has a load part but the load part is used to carry a slave address, a read/write flag, or I 2 C data. Because the I 2 C status is indicated in the packet header of the data packet, the I 2 C status may be encapsulated in a same data packet together with the slave address, the read/write flag, or the I 2 C data. In other words, the I 2 C status may not need to occupy one data packet separately.
1. A communication method implemented by a first device, wherein the communication method comprises:
generating a data packet comprising a packet header and a load, wherein the packet header comprises a first field indicating an inter integrated circuit (I 2 C) status and a third field comprising a fourth field and a fifth field, wherein the third field indicates that the data packet is an I 2 C-based data packet when the fourth field indicates that an encapsulation service type of the data packet is a control service and the fifth field indicates that a data format of the data packet is I 2 C data, wherein the I 2 C status is start of data transmission, continuation of the data transmission, stop of the data transmission, an acknowledgment (ACK), or a negative acknowledgment (NACK), and wherein a length of the load is greater than or equal to 0 bits; and
sending the data packet to a second device.
2. The communication method of claim 1 , wherein the first field comprises:
a first value indicating that the I 2 C status is the start of the data transmission;
a second value indicating that the I 2 C status is the continuation of the data transmission;
a third value indicating that the I 2 C status is the stop of the data transmission;
a fourth value indicating that the I 2 C status is the ACK; or
a fifth value indicating that the I 2 C status is the NACK.
3. The communication method of claim 1 , wherein the first field indicates that the I 2 C status is the start of the data transmission, and wherein the load carries a slave address of a slave device and carries a read/write flag.
4. The communication method of claim 3 , wherein the slave address is 7 bits and the read/write flag is 1 bit.
5. The communication method of claim 1 , wherein the first field indicates that the I 2 C status is the continuation of the data transmission, and wherein the load carries I 2 C data.
6. The communication method of claim 1 , wherein the packet header further comprises a second field indicating an I 2 C interface.
7. The communication method of claim 6 , wherein the second field indicates a flow identifier (ID) of a flow of the data packet, and wherein the flow ID corresponds to the I 2 C interface.
8. The communication method of claim 1 , wherein the third field indicates that the data packet is the I 2 C-based data packet when the third field is a first preset value.
9. The communication method of claim 8 , wherein the fourth field indicates that the encapsulation service type is the control service when the fourth field is a second preset value, and wherein the fifth field indicates that the data format is the I 2 C data when the fifth field is a third preset value.
10. A communication method implemented by a second device, wherein the communication method comprises:
receiving, from a first device, a data packet comprising a packet header and a load, wherein the packet header comprises a first field indicating an inter integrated circuit (I 2 C) status and a third field comprising a fourth field and a fifth field, wherein the third field indicates that the data packet is an I 2 C-based data packet when the fourth field indicates that an encapsulation service type of the data packet is a control service and the fifth field indicates that a data format of the data packet is I 2 C data, wherein the I 2 C status is start of data transmission, continuation of the data transmission, stop of the data transmission, an acknowledgment (ACK), or a negative acknowledgment (NACK), and wherein a length of the load is greater than or equal to 0 bits; and
determining the I 2 C status based on the first field.
11. The communication method of claim 10 , wherein the first field comprises:
a first value indicating that the I 2 C status is the start of the data transmission;
a second value indicating that the I 2 C status is the continuation of the data transmission;
a third value indicating that the I 2 C status is the stop of the data transmission;
a fourth value indicating that the I 2 C status is the ACK; or
a fifth value indicating that the I 2 C status is the NACK.
12. The communication method of claim 10 , wherein the first field indicates that the I 2 C status is the start of the data transmission, wherein the load carries a slave address of a slave device and carries a read/write flag, and wherein the communication method further comprises:
generating a start state on at least one I 2 C interface; and
sending, through the at least one I 2 C interface, the slave address and the read/write flag to the slave device corresponding to the slave address.
13. The communication method of claim 10 , wherein the first field indicates that the I 2 C status is the continuation of the data transmission, wherein the load carries I 2 C data, and wherein the communication method further comprises sending, through at least one I 2 C interface, the I 2 C data to a slave device corresponding to a slave address.
14. The communication method of claim 10 , wherein the packet header further comprises a second field indicating an I 2 C interface.
15. The communication method of claim 14 , wherein the second field indicates a flow identifier (ID) of a flow of the data packet, and wherein the flow ID corresponds to the I 2 C interface.
16. The communication method of claim 10 , wherein the third field indicates that the data packet is the I 2 C-based data packet when the third field is a first preset value.
17. A communication apparatus, comprising:
a memory configured to store instructions; and
a processor coupled to the memory and configured to:
generate a data packet comprising a packet header and a load, wherein the packet header comprises a first field indicating an I 2 C status and a third field comprising a fourth field and a fifth field, wherein the third field indicates that the data packet is an I 2 C-based data packet when the fourth field indicates that an encapsulation service type of the data packet is a control service and the fifth field indicates that a data format of the data packet is I 2 C data, wherein the I 2 C status is start of data transmission, continuation of the data transmission, stop of the data transmission, an acknowledgment (ACK), or a negative acknowledgment (NACK), and wherein a length of the load is greater than or equal to 0 bits; and
send the data packet to a second device.
18. The communication apparatus of claim 17 , wherein the first field comprises:
a first value indicating that the I 2 C status is the start of the data transmission;
a second value indicating that the I 2 C status is the continuation of the data transmission;
a third value indicating that the I 2 C status is the stop of the data transmission;
a fourth value indicating that the I 2 C status is the ACK; or
a fifth value indicating that the I 2 C status is the NACK.
19. The communication apparatus of claim 17 , wherein the first field indicates that the I 2 C status is the start of the data transmission, and wherein the load carries a slave address of a slave device and carries a read/write flag.
20. The communication apparatus of claim 17 , wherein the first field indicates that the I 2 C status is the continuation of the data transmission, and wherein the load carries I 2 C data.
21. The communication apparatus of claim 17 , wherein the packet header further comprises a second field indicating an I 2 C interface.
22. The communication apparatus of claim 21 , wherein the second field indicates a flow identifier (ID) of a flow of the data packet, and wherein the flow ID corresponds to the I 2 C interface.
23. The communication apparatus of claim 17 , wherein the third field indicates that the data packet is the I 2 C-based data packet when the third field is a first preset value.
24. A communication apparatus, comprising:
a memory configured to store instructions; and
a processor coupled to the memory and configured to:
receive a data packet from a first device, wherein the data packet comprises a packet header and a load, wherein the packet header comprises a first field indicating an I 2 C status and a third field comprising a fourth field and a fifth field, wherein the third field indicates that the data packet is an I 2 C-based data packet when the fourth field indicates that an encapsulation service type of the data packet is a control service and the fifth field indicates that a data format of the data packet is I 2 C data, wherein the I 2 C status is start of data transmission, continuation of the data transmission, stop of the data transmission, an acknowledgment (ACK), or a negative acknowledgment (NACK), and wherein a length of the load is greater than or equal to 0 bits; and
determine the I 2 C status based on the first field.
25. The communication apparatus of claim 24 , wherein the first field comprises:
a first value indicating that the I 2 C status is the start of the data transmission;
a second value indicating that the I 2 C status is the continuation of the data transmission;
a third value indicating that the I 2 C status is the stop of the data transmission;
a fourth value indicating that the I 2 C status is the ACK; or
a fifth value indicating that the I 2 C status is the NACK.
26. The communication apparatus of claim 24 , wherein the first field indicates that the I 2 C status is the start of the data transmission, wherein the load carries a slave address of a slave device and carries a read/write flag, and wherein the processor is further configured to:
generate a start state on at least one I 2 C interface; and
send, through the at least one I 2 C interface, the slave address and the read/write flag to the slave device corresponding to the slave address.
27. The communication apparatus of claim 24 , wherein the first field indicates that the I 2 C status is the continuation of the data transmission, wherein the load carries I 2 C data, and wherein the processor is further configured to send, through at least one I 2 C interface, the I 2 C data to a slave device corresponding to a slave address.
28. The communication apparatus of claim 24 , wherein the packet header further comprises a second field indicating an I 2 C interface.
29. The communication apparatus of claim 28 , wherein the second field indicates a flow identifier (ID) of a flow of the data packet, and wherein the flow ID corresponds to at least one I 2 C interface.
30. The communication apparatus of claim 24 , wherein the third field indicates that the data packet is the I 2 C-based data packet when the third field is a first preset value.