tuning.c

以ST公司CPU为核心的彩色电视机的完整源程序。

/********************* SGS-THOMSON MICROELECTRONICS ************************
FILENAME     : TUNING.C
VERSION      : V1.0
DATE         : JAN 1999
AUTHOR(s)    : ASHISH RUDOLA / DEEPAK DOSHI
PROCESSOR    : ST92195
DESCRIPTION  : This module includes functions which perform channel tuning.
MODIFICATIONS:
	-
*****************************************************************************/

#include "st92196.h"
#include "tuning.h"
#include "macro.h"
#include "autosrch.h"
#include "channel.h"
#include "eeprom.h"
#include "i2c_bus.h"
#include "io.h"
#include "label.h"
#include "power.h"
#include "register.h"
#include "source.h"
#include "timer.h"
#include "utility.h"
#include "video.h"
#include "audio.h"
#include "tv_glob.h"


unsigned char system;

/* Save the current tuning state */
unsigned char tuning_state;

/*****************************************************************************
INPUTS     : none
OUTPUTS    : TUNING_REQUEST - Disable any possible tuning request
DESCRIPTION: This function initializes tuning to prevent false tuning.
*****************************************************************************/
void init_tuning(void)
{
	/* Reset tuning flags to prevent non wanted tuning on start-up */
	tuning_flags = tuning_flags & ~TUNING_REQUEST;
}

/*****************************************************************************
INPUTS     : none
OUTPUTS    : tuning_state - Point the first tuning process to start with
	     TUNING_REQUEST - Request a tuning
DESCRIPTION: This function initializes the tuning to its nominal state. It
	     should be called before any other function of this module is
	     used.
*****************************************************************************/
void start_tuning(void)
{
	/* Prepare that should be the first process to start with */
	tuning_state = SETUP_TUNING;

	/* initiate a tuning procedure, set tuning flags */
	tuning_flags = tuning_flags | TUNING_REQUEST;
		/* Check if this channel is stored in the channel list (EEPROM) */
/*		i = read_channel_info(SETTINGS);*/

  	init_channel();   

}

/*****************************************************************************
INPUTS     : TUNING_REQUEST - Set if a tuning has been requested
	     tuning_state - Current state to work with
	     channel - New channel to tune
OUTPUTS    : TUNING_REQUEST - Reset after tuning completion
	     tuning_state - Next state to handle
	     video_status - Current video status
             TUNING_AV_TIMER - General purpose timer for the tuning
	     REFRESH_DISPLAY - Refresh autosearch bargraph display
             STANDARD_SELECTION - Enable automatic color recognition
             ENABLE_AFC - Enable AFC if it has to be done (EEPRM info)
             ST9 Voltage Synthesis registers
	     see mute_audio_video
             see set_external_source_input
             see set_internal_source_input
             see read_channel_info
             see read_label
             see set_system
             see set_band
DESCRIPTION: This function updates tuning states.
*****************************************************************************/

void update_tuning(void)
{
	unsigned char i ;
	unsigned int j ;

	/* Check if a tuning has been requested */
	if (!(tv_flags & ON_STATE))
		return;


	/* Check if a tuning has been requested */
	if (tuning_flags & TUNING_REQUEST)
	{
		switch (tuning_state)
		{
			case SETUP_TUNING:
	            /*mute audio and blank the screen */
 				mute_audio_video();

                /* Make sure automatic color recognition is active */
				write_video_ram_data(STANDARD_SELECTION, 0x18);

                /* Disable AFC while tuning (not restored if video channel) */
				tuning_flags = tuning_flags & ~ENABLE_AFC;

                    /* Select internal video source  */
				/*	set_internal_source_input(); *//* source.c */
				source = TUNER;
				get_source_input();
				tuning_state = SETUP_VS;

				/* Set blanking and muting time */
				fast_timers[TUNING_AV_TIMER] = 500/MS_PER_INTERRUPT;

				break;

			case SETUP_VS:

				i = read_channel_info(VS_MSB);
                /* Setup AFC according to new channel settings */

				j = i ;
				i = i &~0xC0;
				i = i | 0x80 ;

                spp (VS_PG);
				asm ("ld R254,%0" : : "r"(i));
				i = read_channel_info(VS_LSB);
				spp (VS_PG);
				asm ("ld R255,%0" : : "r"(i));

				j = j &~ 0x3f ;
				j >>= 6 ;
				set_band(j) ;

#ifdef FINE_TUNE_STATUS

	j = EEPROM_START_FINE_TUNE_STATUS + (channel-1);
   i = read_eeprom(j);
	fine_tune = i &~ 0xC0;
	if(fine_tune == 0x1F)
        tuning_flags = tuning_flags | ENABLE_AFC;  
	else
        tuning_flags = tuning_flags &~ENABLE_AFC;  

#else
		   fine_tune = 31;
        tuning_flags = tuning_flags | ENABLE_AFC;  
#endif

				tuning_state = SETUP_CHANNEL;
				break;

			case SETUP_CHANNEL:
 				if (fast_timers[TUNING_AV_TIMER] != 0)
 					return;                         
 				/* unmute_audio_video();*/

				/* Get possible associated label */
				read_label();	/* label.c */

				set_color_standard();
				set_audio_standard();

				tuning_state = STOP_TUNING;

	/* Enable status display and refresh the current display */
	            display_request_flags |= (STATUS_DISPLAY | REFRESH_DISPLAY );

				fast_timers[TUNING_AV_TIMER] = 50/MS_PER_INTERRUPT;//feman add
				break;

			case STOP_TUNING:
				/* Before doing anything else, wait AGC to stabilize */
				if (fast_timers[TUNING_AV_TIMER] != 0) //feman debug 
				return;                         

				unmute_audio_video(); 
				user_flags = user_flags & ~FORCED_NICAM_FLAG;

				tv_flags = tv_flags &~ INITIAL_SETUP ;

				write_eeprom(EEPROM_LAST_CHANNEL,channel);

				tuning_flags = tuning_flags & ~TUNING_REQUEST;


			break;
		}
	}
}

/*****************************************************************************
INPUTS     : ENABLE_AFC - Do not track IF if AFC not enabled
		     video_status - Check identification bit
OUTPUTS    : ST9 Voltage Synthesis registers
		     see read_AFC
DESCRIPTION: AFC level can be modified by the temperature, so this function
	    	 updates VS so as to keep AFC at the nominal value.
*****************************************************************************/
void monitor_AFC(void)
{
	unsigned char i;                        /* Temporary storage */

	if (tuning_flags & ENABLE_AFC)
	{
		/* Make sure a channel is present before updating VS */

 			read_video_new();
 			i = read_data[0] & 0x08;
			if(i == 0x08)
			{ 			
 				i = read_data[2] & 0x07;
/*				if(i == 2 || i == 3)*/
				if(i == 2 )
					increment_VS ( SLOW_STEP) ;
				if(i == 3 )
					increment_VS ( MEDIUM_STEP) ;
				if(i == 4 )
					decrement_VS ( SLOW_STEP) ;
				if(i == 5 )
						decrement_VS ( MEDIUM_STEP) ;
						
			}
	}
}

/*****************************************************************************
INPUTS     : Band to tune
OUTPUTS    : ST9 IO registers
DESCRIPTION: This function sets IO pins according to the band selected. Make
	     sure a band has been defined (UHF as default in case of).
*****************************************************************************/
void set_band(unsigned char selected_band)
{
	  P3DR = P3DR & ~BAND_MASK;

    switch(selected_band)    
    {
    case VHF_L:    
        P3DR = P3DR | BAND_VL;/* VHF_L Selected*/

    break;
    case VHF_H:
        P3DR = P3DR | BAND_VH; /* VHF_H Selected*/
    break;
    case UHF:
        P3DR = P3DR | BAND_U;  /* UHF SELECTED */
    break;

    default :
        P3DR = P3DR | BAND_VL;
    break;

    }						
}			

/*****************************************************************************
INPUTS     : System to select
OUTPUTS    : ST9 IO registers
	         IF_STANDARD - Set modulation mode (positive/negative)
DESCRIPTION: This function selects system to use. Make sure a system has been
    	     defined (system C as default in case of).
*****************************************************************************/
void set_video_audio_system(unsigned char audio_standard)
{
	unsigned char j;


		if ((AUDIO_system == SYSTEM_BG) || (AUDIO_system == SYSTEM_DK)||(AUDIO_system == SYSTEM_I))
		{
				write_video_ram_data(SAW_FILTER_SWITCH, 0x10);
				j = misc1 & 0x02;
				if( j == 0) ;/* QSS */
//					P4DR = P4DR &~ SAW_SW1;
				else ;
//					P4DR = P4DR | SAW_SW1;
//				P4DR = P4DR &~ SAW_SW2;
		}
		else
		{
				write_video_ram_data(SAW_FILTER_SWITCH, 0x00);
				j = misc1 & 0x02;
				if( j == 0) ;/* QSS */
//					P4DR = P4DR | SAW_SW1;
				else ;
//					P4DR = P4DR & ~SAW_SW1;
//				P4DR = P4DR | SAW_SW2;
				
		}

} 

/*************************************************************************
This function is used to select varoius COLOR Standard

*************************************************************************/

void set_color_standard(void)
{
	unsigned char j;

				j = read_channel_info(SETTINGS);
   				system = get_value(j,SYSTEM_MASK);
				
				
  				if (system == SYSTEM_SECAM)
				{
					write_video_ram_data(STANDARD_SELECTION, 0x10);

				}

				if (system == SYSTEM_PAL)
				{
					write_video_ram_data(STANDARD_SELECTION, 0x00);
				}
				if (system == SYSTEM_NTSC_1)
				{
					write_video_ram_data(STANDARD_SELECTION, 0x08);
				}

				if (system == SYSTEM_NTSC_2)
				{
					write_video_ram_data(STANDARD_SELECTION, 0x0A);
				}

				if (system == SYSTEM_AUTO)
				{
					write_video_ram_data(STANDARD_SELECTION, 0x18);
				}

}


/*************************************************************************
This function is used to select varoius SOUND Standard

*************************************************************************/

void set_audio_standard(void)
{
	unsigned char j;

				j = read_channel_info(SETTINGS);
   				AUDIO_system = get_value(j,AUDIO_SYSTEM_MASK);
				
				
  				if (AUDIO_system == SYSTEM_BG)
				{
					write_video_ram_data(SOUND_STANDARD, 0x04);
				}

  				if (AUDIO_system == SYSTEM_DK)
				{
					write_video_ram_data(SOUND_STANDARD, 0x00);
				}

  				if (AUDIO_system == SYSTEM_I)
				{
					write_video_ram_data(SOUND_STANDARD, 0x02);
				}

  				if (AUDIO_system == SYSTEM_MN)
				{
					write_video_ram_data(SOUND_STANDARD, 0x06);
				}
				if (!(tuning_flags & AUTOSEARCH_REQUEST))
					set_video_audio_system(AUDIO_system) ;	

}

/******************************************************************************


******************************************************************************/
void store_program_info(unsigned char channel)
{
  unsigned char i,k;
	unsigned int j;

	k = P3DR & BAND_MASK;  //FEMAN P4DR -> P3DR

    if(k == BAND_VL)
        k = VHF_L;
    else
        if( k == BAND_VH)
            k = VHF_H;
        else
            k = UHF;
 
	k <<= 6;
	k = k & 0xC0;

	spp(VS_PG);
    asm ("ld %0,R254" : "=r"(i));

   i= i &~ 0xC0;
	i = i | k;
	j = EEPROM_START_CHANNEL_MEMORY + ((channel-1) * 3);

	write_eeprom(j,i);

    spp (VS_PG);
    asm ("ld %0,R255" : "=r"(i));
    j++;
    write_eeprom(j, i);


#ifdef FINE_TUNE_STATUS

	j = EEPROM_START_FINE_TUNE_STATUS + (channel-1);
	i = fine_tune &~ 0xC0;
   write_eeprom(j, i);

#endif

}