Fitipower

Tuner used together with AF9035.

Specifications

Don't trust this blindly.

Tuner general info

I2C address is 0xC0. There are 18 tuner registers indexed from 0.

Index	Name
1	FA
2	FP
3,4	XIN
5	VCO
6	VCO_SELECT
14	VCO_CALIBRATE

Init/Reset

Enable tuner:

• write 1 to GPIO 0xD8EB
• write 1 to GPIO 0xD8EC
• write 1 to GPIO 0xD8ED

Enable led:

• write 1 to GPIO 0xD8D1
• write 1 to GPIO 0xD8D0

UnInit

Disable led:

• write 0 to GPIO 0xD8D1
• write 0 to GPIO 0xD8D0

Tune

Tuning is based on 2 parameters:

• bandwidth in Hz, can be 6000,7000 or 8000
• frequency in Hz, can be the regular DVB-T frequency's

Init tuning

• write 0x0F to tuner register 7
• write 0x3E to tuner register 8
• write 0xB8 to tuner register 10
• write 0x80 to tuner register 11
• write 0x04 to tuner register 13

Generate the frequency of VCO and the VCO divider

fvco is a parameter

if frequency < 54000

• set fvco to frequency * 64
• set tuner registry 5 to 0x82

if 54000 =< frequency < 108000

• set fvco to frequency * 32
• set tuner registry 5 to 0x42

if 108000=< frequency < 216000

• set fvco to frequency * 16
• set tuner registry 5 to 0x22

if 216000=< frequency < 432000

• set fvco to frequency * 8
• set tuner registry 5 to 0x12

if frequency > 432000

• set fvco to frequency * 4
• set tuner registry 5 to 0x0A

Calculate XIN

TBD

Calculate FP and FA

TBD

Select bandwidth

if bandwidth = 8000

• set tuner registry 6 to 0x0

if bandwidth = 7000

• set tuner registry 6 to 0x40

if bandwidth = 6000

• set tuner registry 6 to 0x80

Fix for low frequency's

if frequency < 45000

• set tuner registry 1 to 0x06
• set tuner registry 2 to 0x11

Fix clock out

• set tuner registry 6 to the result of a bitwise OR between tuner registry 6 and 0x20

Write frequency parameters

• write tuner registry 0-6