HCI_EEPROM_READ Command and Event

Use the HCI_EEPROM_READ command to read back the data from the EEPROM location specified by the Start_Address parameter. The OCF is 0x29 and the HCI OpCode is 0xFC29. To verify, use the HCI_EEPROM_READ command to read back the EEPROM record after a HCI_EEPROM_WRITE command.

Start_Address – Indicates the start address of the EEPROM record and takes 2 bytes
Length – Indicates the read length of the EEPROM record and takes 1 byte (approximately ranging from 1-240)

Data is returned in the command complete event:

Status – Indicates the operation status and takes 1 byte
Start_Address – Indicates the start address of the EEPROM record and takes 2 bytes
Length – Indicates the length of the EEPROM record and takes 1 byte (approximately ranging from 1-240)
Data – Indicates the data of the EEPROM record and takes Length bytes

Table 1. `HCI_EEPROM_Read` Command
Command	OCF	Command Parameters	Return Parameters
`HCI_EEPROM_Read`	0x29	`Start_Address` and Length	Status, `Start_Address`, Length and Data
Use the `HCI_EEPROM_Read` command to read the data from EEPROM.
`Start_Address`	Size – 2 bytes
Value	Parameter Description
0xXXXX	Start reading address
Length	Size – 1 byte
Value	Parameter Description
N	Indicates the length of the data to read (in bytes) from EEPROM. N: 1-240
Status	Size – 1 byte
Value	Parameter Description
0x00	`HCI_EEPROM_Read` command succeeded
0x01-0xFF	`HCI_EEPROM_Read` command failed. See listing of Error Codes.
`Start_Address`	Size – 2 bytes
Value	Parameter Description
0xXXXX	Start reading address
Length	Size – 1 byte

Data	Size – N bytes
Value	Parameter Description
	N bytes of data read from EEPROM

Example data – HCI_EEPROM_READ Command
- 0x01 – HCI command packet
- 0x29 0xFC – OpCode 0xFC29 is sent in a little endian as 0x29 0xFC
- 0x03 – The parameter length of the HCI command
- 0x00 0x07 – Start_Address of the E2PROM record
- 0x03 – Read back the length of the EEPROM record
Figure 1. Exampe of HCI_EEPROM_READ Command
Example data – Event to HCI_EEPROM_ READ command
- 0x04 – HCI event packet
- 0x0E – Command complete event of the HCI event
- 0x0A – Total 10 bytes of parameter appended
- 0x01 0x29 0xFC – The processed HCI command
- 0x00 – Indicate a success
- 0x00 0x07 – Start_Address of the EEPROM record
- 0x03 – Read back the length of the EEPROM record
- 0x04 0x04 0x24 – Read back data of the EEPROM record
Figure 2. Event of HCI_EEPROM_READ Command