IBASE IBD185 - Manual (Page 14)

14 IBD185 User Guide
1.3.7 I2C Bus Interface Sub Command Set
This command set is a subset of the IB protocol command.
It provides an interface for HOST to control the I2C bus master on
DEVICE side.
The sub command set is constructed by a specific command ID
(I2C_API_COMMAND) in “Command” field of packet, and the payloads
are embedded in “Data” field.
Header Size Command Data CRC
2 bytes 1 byte 1 byte 0 – 64 bytes 2 bytes
Sub Command
Length
Sub Command
Code
Sub Command
Data
1 byte 1 byte 0 – 32 bytes
The supported command of I2C bus interface command set list below:
Code Symbol Description
0x01 I2CAPI_BUS_INIT Initial the specific I2C bus master
0x02 --- reserved
0x03 I2CAPI_BUS_ENABLE Enable/Disable the specific I2C bus
0x04 I2CAPI_DEV_STATUS Detect the slave status on the
specific I2C bus.
0x05 I2CAPI_DEV_READ Perform I2C device read operation
0x06 I2CAPI_DEV_WRITE Perform I2C device write operation
0x07 I2CAPI_BUS_RESET Reset the specific I2C bus
0x08 --- reserved
Here is a simple illustration of the interface functions in pseudo code.
I2C_Bus_Init(BusID,Speed);
I2C_Bus_Enable(BusID,Enabled);
I2C_Device_Detect(BusID,SlvAddr);
I2C_Device_Read(BusID,SlvAddr,CmdLen,CmdCode[8],Flag,DatLen,
DatBuff[32]);
I2C_Device_Write(BusID,SlvAddr,CmdLen,CmdCode[8],Flag,DatLen,
DatBuff[32]);
I2C_Bus_Reset(BusID,Flag);
Sub Command Set