Quantek QT1010

The Quantek QT1010 is a wideband tuner chip.

Features

• 48MHz-860MHz frequency range (bands I, II, III, IV).
• 30MHz-60MHz IF output range.
• NTSC, PAL, SECAM broadcast formats.
• DVB-C, DVB-T, ATSC and ISDB-T support.

External Links

QT1010 Product page at qantek-inc.com

Tuner registers

Indexed from 0.

Index	Name	Description
1	OP	0x00 = start tuner with programmed registers, 0x80 = set tuner to programming mode
5	VCOBAND	This controls the frequency operating range of the tuner. Low 4 bits can be 0 or 4, High 4 bits can be 1,3,5,7,9.
17	LNA	0xF0 = disable LNA hardware power, used for sleep(), 0xF9 and 0xFD used to enable hardware with LNA on/off

Description of how to program the chip

Tuner context

The tuner has a global context for some variables. They can be used anytime in the init and set methods.

• reg31
• reg32
• reg34
• reg34_1
• reg34_2
• reg34_3
• reg34_4
• reg34_5
• reg34_6
• reg34_7
• reg34_8
• reg37
• reg38

Tuner Init

This method has no arguments.

• write 0x80 to tuner register 1
• write 0x84 to tuner register 13
• write 0xB4 to tuner register 14* (or 0xB7 might work better on some older devices)
• write 0x23 to tuner register 42
• write 0xDC to tuner register 44
• write 0x40 to tuner register 37
• write 0x00 to tuner register 30
• write 0x81 to tuner register 30

• loop 30 times
  • read tuner register 37 into reg37
  • if reg37 bit 8 is set
    • break out of loop

• read tuner register 37 into reg37
• write 0x00 to tuner register 30
• write 0x23 to tuner register 42
• write 0x70 to tuner register 43
• write 0x08 to tuner register 38
• write 0x00 to tuner register 30
• write 0x82 to tuner register 30

• loop 30 times
  • read tuner register 38 into reg38
  • if reg38 bit 5 is set
    • break out of loop

• read tuner register 38 into reg38
• write 0x00 to tuner register 30
• write 0x14 to tuner register 5
• write 0x44 to tuner register 6
• write 0x28 to tuner register 7
• write 0x0B to tuner register 8
• write 0xFD to tuner register 17* (this can be 0x0D in some cases)
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x0D to tuner register 34
• write 0x00 to tuner register 30
• write 0xD0 to tuner register 30

• loop 30 times
  • read tuner register 34
  • if register 34 bit 6 is set
    • break out of loop

• write 0x00 to tuner register 30
• write 0x40 to tuner register 6
• write 0xF0 to tuner register 22
• write 0x38 to tuner register 2
• write 0x19 to tuner register 3
• write 0x20 to tuner register 31
• write 0xE0 to tuner register 32
• write 0x00 to tuner register 30
• write 0x84 to tuner register 30

• loop 30 times
  • read tuner register 31 into reg31
  • if register 31 bit 7 is set
    • break out of loop

• read tuner register 31 into reg31
• read tuner register 32 into reg32
• write 0x00 to tuner register 30
• write 0x3F to tuner register 2
• write 0x53 to tuner register 33
• read tuner register 33 into reg33
• write 0xFD to tuner register 17* (this can be 0x0D in some cases)
• write 0x34 to tuner register 5
• write 0x44 to tuner register 6
• write 0x31 to tuner register 7
• write 0x08 to tuner register 8
• write 0xD0 to tuner register 34
• write 0x00 to tuner register 30
• write 0xD0 to tuner register 30

• loop 30 times
  • read tuner register 34
  • if register 34 bit 6 is set
    • break out of loop

• write 0x00 to tuner register 30
• read tuner register 34 into reg34_1
• write 0x32 to tuner register 7
• write 0xD0 to tuner register 34
• write 0x00 to tuner register 30
• write 0xD0 to tuner register 30

• loop 30 times
  • read tuner register 34
  • if register 34 bit 6 is set
    • break out of loop

• write 0x00 to tuner register 30
• read tuner register 34 into reg34_2
• write 0x33 to tuner register 7
• write 0xD0 to tuner register 34
• write 0x00 to tuner register 30
• write 0xD0 to tuner register 30

• loop 30 times
  • read tuner register 34
  • if register 34 bit 6 is set
    • break out of loop

• write 0x00 to tuner register 30
• read tuner register 34 into reg34_3
• write 0x34 to tuner register 7
• write 0xD0 to tuner register 34
• write 0x00 to tuner register 30
• write 0xD0 to tuner register 30

• loop 30 times
  • read tuner register 34
  • if register 34 bit 6 is set
    • break out of loop

• write 0x00 to tuner register 30
• read tuner register 34 into reg34_4
• write 0x35 to tuner register 7
• write 0xD0 to tuner register 34
• write 0x00 to tuner register 30
• write 0xD0 to tuner register 30

• loop 30 times
  • read tuner register 34
  • if register 34 bit 6 is set
    • break out of loop

• write 0x00 to tuner register 30
• read tuner register 34 into reg34_5
• write 0x36 to tuner register 7
• write 0xD0 to tuner register 34
• write 0x00 to tuner register 30
• write 0xD0 to tuner register 30

• loop 30 times
  • read tuner register 34
  • if register 34 bit 6 is set
    • break out of loop

• write 0x00 to tuner register 30
• read tuner register 34 into reg34_6
• write 0x37 to tuner register 7
• write 0xD0 to tuner register 34
• write 0x00 to tuner register 30
• write 0xD0 to tuner register 30

• loop 30 times
  • read tuner register 34
  • if register 34 bit 6 is set
    • break out of loop

• write 0x00 to tuner register 30
• read tuner register 34 into reg34_7
• write 0x38 to tuner register 7
• write 0xD0 to tuner register 34
• write 0x00 to tuner register 30
• write 0xD0 to tuner register 30

• loop 30 times
  • read tuner register 34
  • if register 34 bit 6 is set
    • break out of loop

• write 0x00 to tuner register 30
• read tuner register 34 into reg34_8
• write 0x39 to tuner register 7
• write 0xD0 to tuner register 34
• write 0x00 to tuner register 30
• write 0xD0 to tuner register 30

• loop 30 times
  • read tuner register 34
  • if register 34 bit 6 is set
    • break out of loop

• write 0xD0 to tuner register 30
• read tuner register 34 into reg34

Tuner set frequency

The frequency set method has one sub-method and one subsub-method.

set_frequency

This method has the frequency argument, called freq and in Hz.

• call set_parameters with freq and command equal to tune
• if reg35 equal to 0xE0
  • call set_parameters with freq and command equal to tune_next
• if reg35 equal to 0xFF
  • call set_parameters with freq and command equal to 3
• if reg34 equal to 0xFF
  • call set_parameters with freq and command equal to 1

set_parameters

arguments freq and command

• call calculate_parameters with freq and command
• write 0x80 to tuner register 1
• write 0x3F to tuner register 2

• if command is equal to tune_next
  • if reg5 is less then 0x74
    • set reg5_1 to reg_5 plus 0x20

• write reg5_1 to tuner register 5
• write 0x44 to tuner register 6
• write freq_slot2 to tuner register 7
• write freq_slot1 to tuner register 8
• write freq_slot4 to tuner register 9
• write freq_slot5 to tuner register 10
• write freq_slot6 to tuner register 11
• write 0xE1 to tuner register 12
• write freq_slot7 to tuner register 26
• write 0x00 to tuner register 27
• write freq_slot8 to tuner register 28
• write 0xFD to tuner register 17*
• write 0x91 to tuner register 18*

• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1
• write 0x80 to tuner register 1

• if reg5_1 is equal to 0x34
  • if freq_slot12 is larger equal to 0xF0
    • if freq_slot12 is less equal to 0xFA
      • write freq_slot12 minus 0x20 into freq_slot12
    • else
      • write 0xDA into freq_slot12
  • else
    • write 0xD0 into freq_slot12
  • write freq_slot12 into tmp_var1
• else
  • write 0xD0 into tmp_var1

• write tmp_var1 to tuner register 34
• write 0x00 to tuner register 30
• write 0xD0 to tuner register 30

• loop 30 times
  • read tuner register 34
  • if register 34 bit 6 is set
    • break out of loop

• write 0x00 to tuner register 30
• read tuner register 34 into reg34
• if reg34 is less equal to 0xFE
  • write reg34 plus 1 to tuner register 34
• read tuner register 5 into reg5
• read tuner register 34 into reg34
• write 0xD0 to tuner register 35
• write 0x00 to tuner register 30
• write 0xE0 to tuner register 30

• loop 30 times
  • read tuner register 35
  • if register 35 bit 6 is set
    • break out of loop

• read tuner register 35 into reg35
• write 0x00 to tuner register 30
• write 0xD0 to tuner register 36
• write 0x00 to tuner register 30
• write 0xF0 to tuner register 30

• loop 30 times
  • read tuner register 36
  • if register 36 bit 6 is set
    • break out of loop

• write 0x00 to tuner register 30
• write 0x7F to tuner register 20
• write 0x7F to tuner register 21

• if command is equal to tune_next
  • if reg5 is less equalt to 0x74
    • write reg5 minus 4 into reg5_3
• write reg5_3 to tuner register 5
• write 0x00 to tuner register 6
• write 0x1F to tuner register 21
• write 0xFF to tuner register 22
• write 0xFF to tuner register 24

• if reg31 is greater equal to 0x50
  • write 0x50 into reg31
• if reg32 is greater equal to 0x12
  • write 0x12 into reg32

• write reg31 plus freq_slot10 to tuner register 31
• write reg32 plus freq_slot11 to tuner register 32
• write reg33 to tuner register 33
• write reg37 to tuner register 37
• write reg38 to tuner register 38

• write 0x96 to tuner register 0
• write 0x00 to tuner register 2
• write 0x00 to tuner register 1

calculate_parameters

Not complete yet*

arguments freq (in Hz) and command

• if freq is less then 60000000 or greater then 900000000
  • return error

• if command is equal to tune_next
  • write g_prev_command to cmd_tmp
• else
  • write command to g_prev_command

• write 36125000 to IF
• write 1232000000 to X
• write 920000000 to Y
• write ((freq + X) divided by 4) plus 500000) to Z
• write (1000000 * Z) divided by 1000000 to T1
• write (4000000* Z) divided by 1000000 - Y - freq to T2
• write (4000000* Z) divided by 1000000 - Y - freq - IF to T3
• write T3 divided by 4000000 to T4
• write T3 divided by 4 to T5
• write T1 modulus 8000000 divided by 1000000 to T6
• write (((T5 plus 15777216 multiplied by T4) multiplied by 16) plus 500000) divided by 1000000 to T7

• write T4 to freq_slot5
• write T7 truncated to 8 bits to freq_slot7
• write 2 multiplied by (T7 shifted left 8) + 137 to freq_slot8

Tuner On/Off

This method has 1 argument, curr set to either 0 or 1

set_tuner_off

• write 0x80 to tuner register 1

• if curr is 1
  • read tuner register 17 into tmp
  • write tmp logical and 0xF0 into tmp
  • write tmp to tuner register 17
• write 0x7F to tuner register 2
• read tuner register 5 into tmp
• write tmp logical or 0xF into tmp
• write tmp to tuner register 5
• write 0xFF to tuner register 6

• write 0x00 to tuner register 1

set_tuner_on

• write 0x80 to tuner register 1

• write 0x00 to tuner register 2
• read tuner register 5 into tmp
• write tmp logical and 0xF0 into tmp
• write tmp to tuner register 5
• write 0x00 to tuner register 6

• write 0x00 to tuner register 1