source: svn/newcon3bcm2_21bu/dst/dmw/src/Channel/DMW_Channel.c @ 76

/* 
        NTSC FullSearch Test Code 
        
        ARZHNA
        
*/
#include "DHL_OSAL.h"
#include "DHL_FE.h"
#include "DHL_DBG.h"
#include "DMW_Status.h"

/* ¸ðµÎ KHz ´ÜÀ§ */
#define SEARCH_STEP_FREQ                                831
#define SHORT_SEARCH_HALF_BOUND                 SEARCH_STEP_FREQ
#define SEARCH_FREQ_POSITIVE_BOUNDARY   844
#define SEARCH_FREQ_NEGATIVE_BOUNDARY   -831

static STATUS dmw_search_ntsc_get_deviation(tDHL_TunerID id, UINT32 freqKHz, INT32* freq)
{
        DHL_RESULT dhl_result;
        
        dhl_result = DHL_FE_Start(id, freqKHz, eDHL_DEMOD_NTSC, NULL);
        if(dhl_result)
                return statusError;

        DHL_OS_Delay(10);

        dhl_result = DHL_FE_GetSignalStatus(id, eDHL_SIGNAL_NTSC_FREQ_DEVIATION, (UINT32*)freq);        
        if(dhl_result)
                return statusError;     
        return statusOK;
}

/* ¸ðµç freq´Â KHz ´ÜÀ§·Î ÀÔ·ÂÇÑ´Ù */
static STATUS dmw_search_ntsc_one_channel(tDHL_TunerID id, UINT32 start_freq, UINT32 end_freq, UINT32 step_freq, UINT32 *tune_freq)
{       
        STATUS result;
        UINT32 freqKHz;
        INT32 freq;     
        
        /* ¿ì¼± Center Frequency·Î ãÀ½. */
        freqKHz = (start_freq+end_freq)/2;

        result = dmw_search_ntsc_get_deviation(id, freqKHz, &freq);
        if(result)
                return result;
        
        if(freq < SEARCH_FREQ_POSITIVE_BOUNDARY && freq > SEARCH_FREQ_NEGATIVE_BOUNDARY){
                *tune_freq = freqKHz + freq;
                return statusOK;
        }else{
                for(freqKHz=start_freq; freqKHz<end_freq; freqKHz+=step_freq)
                {
                        /* ½Ã°£À» ÁÙÀ̱â À§ÇØ ÀÌ¹Ì ºñ±³ÇÑ Center Frequency´Â ãÁö ¾Ê´Â´Ù. */
                        if(((start_freq+end_freq)/2)+step_freq>freqKHz && ((start_freq+end_freq)/2)-step_freq<freqKHz)
                                continue;
                                
                        result = dmw_search_ntsc_get_deviation(id, freqKHz, &freq);
                        if(result)
                                return result;
                        
                        if(freq < SEARCH_FREQ_POSITIVE_BOUNDARY && freq > SEARCH_FREQ_NEGATIVE_BOUNDARY){
                                *tune_freq = freqKHz + freq;
                                return statusOK;
                        }                       
                }       
        }
        
        return statusError;
}


STATUS DMW_NtscFullSearch(tDHL_TunerID id, int channel, tDHL_FreqStd freqTbl, INT32 *tune_freq, UINT32 search_range)
{
        STATUS result;
        UINT32 try_freq;
        
        /*
         * Convert Channel to Frequency if bFreq == CHANNEL.
         */     
        try_freq = DHL_FE_ChannelToFrequency(channel, freqTbl);

        result = dmw_search_ntsc_one_channel(id, try_freq-search_range, try_freq+search_range, SEARCH_STEP_FREQ, &tune_freq);

        return result;
}

STATUS DMW_NtscShortSearch(tDHL_TunerID id, int channel, tDHL_FreqStd freqTbl, INT32 *tune_freq, UINT32 search_range)
{
        STATUS result;
        UINT32 try_freq;
        
        result = DMW_NtscFullSearch(id, channel, freqTbl, tune_freq, SHORT_SEARCH_HALF_BOUND);
        
        return result;
}