fq12xx.h

philips fq1236第三代tuner i2c通信Ｃ５１驱动程序

//fq12xx driver

#define FQ12XX_RF_ADD   0xc0
#define FQ12XX_IF_ADD   0x86 

#define FQ12XX_IF   4575    // 45.75MHZ

#define MIN_IPF   4800    // 48 MHZ
#define MAX_IPF   140000  // 1400 MHZ

#define MAX_CH_NO   30     

unsigned char pdivider_lo;
unsigned char pdivider_hi;

unsigned long in_freq = 18425;  // init frequency = 184.25MHZ
unsigned long lo_freq;

unsigned char fine_value = 20;
/*
// frequency table
unsigned int code ch_tab[100] = {
4955, 5755, 6555, 7705, 8505,
11205,12005,12805,13605,14405,
15205,16005,16805,17605,18405,
19205,20005,20805,21605,22405,
23205,24005,24805,25605,26405,
27205,28005,28805,29605,30405,
31205,32005,32805,33605,34405,
35205,36005,36805,37605,38405,
39205,40005,40805,41605,42405,
43205,44005,44805,45605,46305,

47105,47905,48705,49505,50305,
51105,51905,52705,53505,54305,
55105,55905,60705,61505,62305,
63105,63905,64705,65505,66305,
67105,67905,68705,69505,70305,
71105,71905,72705,73505,74305,
75105,75905,76705,77505,78305,
79105,79905,80705,81505,82305,
83105,83905,84705,85505,86305
}
*/ 

void set_fq12xx_lo(void)
{
    lo_freq = in_freq + fine_value*5 - 100;
}

void wr_fq12xx_rf(void)
{   
    lo_freq = in_freq + FQ12XX_IF;
	lo_freq = lo_freq + fine_value*5 - 100;
	lo_freq = lo_freq*16/100;   
    pdivider_lo = lo_freq&0xff;
    pdivider_hi = ((lo_freq>>8)&0xff);
	i2c_data = pdivider_lo;	
	i2c_write(FQ12XX_RF_ADD,pdivider_hi);
    if(in_freq < 15800)
	{
       i2c_data = 0x41;
	   i2c_write(FQ12XX_RF_ADD,0x86);
    }
    else if(in_freq < 44200)
	{
       i2c_data = 0x42;
	   i2c_write(FQ12XX_RF_ADD,0x86);
    }
	else
	{
       i2c_data = 0x44;
	   i2c_write(FQ12XX_RF_ADD,0x86);
    }
	i2c_data = 0xa0;
	i2c_write_without_subaddr(FQ12XX_RF_ADD);

}

void wr_fq12xx_if(void)
{  
    i2c_data = 0x56;
	i2c_write(FQ12XX_IF_ADD,0x00);

    i2c_data = 0x30;
	i2c_write(FQ12XX_IF_ADD,0x01);

    i2c_data = 0x44;
	i2c_write(FQ12XX_IF_ADD,0x02);
}


void rd_fq12xx_if(void)
{
    i2c_data = 0xff;
	i2c_read_without_subaddr(FQ12XX_IF_ADD);
}