# Difference between revisions of "Fitipower"

From LinuxTVWiki

(Calculate XIN) |
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fvco is a parameter | fvco is a parameter | ||

− | if frequency < 54000 | + | *if frequency < 54000 |

− | * set fvco to frequency * 64 | + | ** set fvco to frequency * 64 |

− | * set tuner registry 5 to 0x82 | + | ** set tuner registry 5 to 0x82 |

− | if 54000 =< frequency < 108000 | + | *if 54000 =< frequency < 108000 |

− | * set fvco to frequency * 32 | + | ** set fvco to frequency * 32 |

− | * set tuner registry 5 to 0x42 | + | ** set tuner registry 5 to 0x42 |

− | if 108000=< frequency < 216000 | + | *if 108000=< frequency < 216000 |

− | * set fvco to frequency * 16 | + | ** set fvco to frequency * 16 |

− | * set tuner registry 5 to 0x22 | + | ** set tuner registry 5 to 0x22 |

− | if 216000=< frequency < 432000 | + | *if 216000=< frequency < 432000 |

− | * set fvco to frequency * 8 | + | ** set fvco to frequency * 8 |

− | * set tuner registry 5 to 0x12 | + | ** set tuner registry 5 to 0x12 |

− | if frequency > 432000 | + | *if frequency > 432000 |

− | * set fvco to frequency * 4 | + | ** set fvco to frequency * 4 |

− | * set tuner registry 5 to 0x0A | + | ** set tuner registry 5 to 0x0A |

=== Calculate XIN === | === Calculate XIN === | ||

Line 92: | Line 92: | ||

xdiv is a parameter | xdiv is a parameter | ||

− | *set xdiv equal to | + | *set xdiv equal to fvco / 18000 |

* set fraction equal to fvco minus xdiv multiplied by 18000 | * set fraction equal to fvco minus xdiv multiplied by 18000 | ||

* set fraction equal to fraction left shifted 15 times and then divided by 18000 | * set fraction equal to fraction left shifted 15 times and then divided by 18000 | ||

Line 107: | Line 107: | ||

*write xin right shifted 8 times to tuner register 3 | *write xin right shifted 8 times to tuner register 3 | ||

*write xin only 8 low bits to tuner register 4 | *write xin only 8 low bits to tuner register 4 | ||

+ | |||

=== Calculate FP and FA === | === Calculate FP and FA === | ||

− | + | fvco is a pre-calculated parameter, | |

+ | xdiv is a pre-calculated parameter, | ||

+ | xdivr is a parameter, | ||

+ | fp is a 8 bit wide parameter, | ||

+ | fa is a parameter | ||

+ | |||

+ | *set xdivr equal to xdiv | ||

+ | *if fvco minus xdiv multiplied by 18000 is greater equal to 9000 | ||

+ | ** set xdivr equal to xdiv + 1 | ||

+ | * set fp equal to xdivr / 8 | ||

+ | * set fa equal to xdivr minus fp left shifted 3 times | ||

+ | * if fa is less then 2 | ||

+ | ** set fp equal fp minus 1 | ||

+ | ** set fa equal fa plus 8 | ||

+ | * write fa to tuner register 1 | ||

+ | * write fp to tuner register 2 | ||

=== Select bandwidth === | === Select bandwidth === | ||

Line 119: | Line 135: | ||

*if bandwidth = 6000 | *if bandwidth = 6000 | ||

** set tuner registry 6 to 0x80 | ** set tuner registry 6 to 0x80 | ||

+ | |||

+ | === VCO selection === | ||

+ | TBD | ||

=== Fix for low frequency's === | === Fix for low frequency's === | ||

Line 130: | Line 149: | ||

=== Write frequency parameters === | === Write frequency parameters === | ||

* write tuner registry 0-6 | * write tuner registry 0-6 | ||

+ | |||

[[Category:Tuners]] | [[Category:Tuners]] |

## Revision as of 16:21, 6 December 2009

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. Always integer division.

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

fraction is a 16bit unsigned parameter, xin is a parameter, fvco is a pre-calculated parameter, xdiv is a parameter

- set xdiv equal to fvco / 18000
- set fraction equal to fvco minus xdiv multiplied by 18000
- set fraction equal to fraction left shifted 15 times and then divided by 18000
- if fraction is greater or equal to 16384
- set fractional equal to fractional plus 32768

- if fraction is equal to 0
- set xin equal to 0

- if 0 < fraction < 511
- set xin equal to 0x200

- if 511 < fraction <= 65025
- set xin equal to fraction

- if 65025 < fraction
- set xin equal to 0xfe00

- write xin right shifted 8 times to tuner register 3
- write xin only 8 low bits to tuner register 4

### Calculate FP and FA

fvco is a pre-calculated parameter, xdiv is a pre-calculated parameter, xdivr is a parameter, fp is a 8 bit wide parameter, fa is a parameter

- set xdivr equal to xdiv
- if fvco minus xdiv multiplied by 18000 is greater equal to 9000
- set xdivr equal to xdiv + 1

- set fp equal to xdivr / 8
- set fa equal to xdivr minus fp left shifted 3 times
- if fa is less then 2
- set fp equal fp minus 1
- set fa equal fa plus 8

- write fa to tuner register 1
- write fp to tuner register 2

### 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

### VCO selection

TBD

### 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