0x32 BMBT Volume (Dial)

BMBT 0xf0 → Radio 0x68
BMBT 0xf0 → Telephone 0xc8

Example Frames

F0 04 68 32 10 BE
F0 04 68 32 30 9E
F0 04 C8 32 11 1F

Parameters

Fixed length. One byte bit field.

DIRECTION   = 0b0000_0001
STEPS       = 0b1111_0000

Direction 0b000_0001

DIRECTION_DOWN    = 0b0
DIRECTION_UP      = 0b1

Steps 0b1111_0000

Velocity of the control, i.e. the faster the control is turned, the greater the number of steps.

STEPS_MIN     = 0b0001
...
STEPS_MAX     = 0b1111

Use Cases

Radio Volume

Radio volume control is the default behaviour.

# Radio Volume Down
F0 04 68 32 10 BE   # -1 step
F0 04 68 32 20 8E   # -2 steps
F0 04 68 32 30 9E   # -3 steps
F0 04 68 32 40 EE   # -4 steps and so on...

# Radio Volume Up
F0 04 68 32 11 BF   # +1 step
F0 04 68 32 21 8F   # +2 steps
F0 04 68 32 31 9F   # +3 steps
F0 04 68 32 41 EF   # +4 steps and so on...

Telephone Volume (Handsfree)

In order for BMBT to send volume commands to Telephone 0xc8, telephone status must have “active” and “handsfree” bits set.

# Telephone Volume Down
F0 04 C8 32 10 1E   # 1 step etc..

# Telephone Volume Up
F0 04 C8 32 11 1F   # 1 step etc..