Getting Started
Page 41
2.9.5
Configuring Wireless Functions
You can configure the following by accessing a configuration register on the SMBus:
Enable/disable power for a wireless interface card
Switch SIM card allocation to wireless interface cards
The standard Linux I2C tools give access to SMB registers.
»
Find out the number of the SMBus where the configuration register is located on
BL51E.
»
If you are unfamiliar with the standard Linux tools, please read the related applica-
tion note.
Usage Examples
Use the 7-bit SMB/I2C address to access a register.
The following examples assume that the SMBus number is 1.
Disable the power for a wireless interface card:
Toggle the allocation of SIM cards to wireless interface card:
See
Chapter 5.1.2 SMBus Configuration Registers on page 85
for the register descrip-
tion along with a list of typical command bytes.
See
Chapter Accessing SMBus/I2C Devices using Standard Linux I2C Tools
.
This disables wireless interface card A of the BL51E.
- You need to read the current value before writing, so you can change only the desired
bit.
- The SMB register has device address
0x21
.
Read the current value of the configuration register:
$
i2cget -y 1 0x21
0xff
Write value
0xf7
to toggle only bit 3 in order to disable the modem.
$
i2cset -y 1 0x21 0x00 0 xf7 b
This switches between the primary and the secondary SIM card on wireless interface card
slot D of the BL51E.
- You need to read the current value before writing, so you can change only the desired
bit.
- The SMB register has device address
0x21
.
Read the current value of the configuration register:
$
i2cget -y 1 0x21
0xff
Write value
0xef
to toggle only bit 4 in order to switch the primary and the secondary
SIM card.
$
i2cset -y 1 0x21 0x00 0xef
