halgft808.c

威望公司MP3 + USB MCU 的参考软件

#include "utiltypedef.h"
#include "common.h"
#include "halGFT808.h"

#if(FM_TRANS_MODULE == FM_TRANS_GFT808)

#define DELAY(x)    DelayUs(x)
static void halGFTSendData(BYTE byData)
{	
	BYTE i;
	GFT_DATAOUT();
	for(i=0; i<8; i++)
	{
		if(byData & 0x01)
			GFT_Data = 1;
		else
			GFT_Data = 0;

		GFT_Clk = 0; //low
		byData >>= 1;
		DELAY(WAIT_TIME);
		GFT_Clk = 1; //high, the data is clocked in on the rising edge of clock
		DELAY(WAIT_TIME);
	}
}
/*-----------------------------------------------------------------------------------------*/
static BYTE data s_FMIdx;

void halFMSet(BYTE byChIdx)
{
	WORD wTransValue = 0x0800; //Test mode bit: 0 0 ; Phase Detector bit: 0 0 ; MPX bit : 1
	
	s_FMIdx = byChIdx;
	UartOutText("-I-: FM Idx 0x");UartOutValue(byChIdx, 2);
	
	wTransValue |= FM_FREQ_BASE + byChIdx;
	
#ifndef FM_NULL_TEST
	GFT_ENABLE();
	GFT_EN = 1;//enable chip
	halGFTSendData((BYTE)wTransValue);
	halGFTSendData((BYTE)(wTransValue >> 8));
	GFT_EN = 0;//at the falling edge of EN, stored data is latched.
#endif	

	return;
}

void halFMUp(void)	//byChIdx: 0-> 203
{
	s_FMIdx++;
	if(s_FMIdx > FM_CHIDX_MAX){//Over Max
		s_FMIdx = 0;		
	}	

	halFMSet(s_FMIdx);	
	
	return;
}

void halFMDown(void)	//byChIdx: 0-> 203
{
	if(s_FMIdx == 0){//Minmal
		s_FMIdx = FM_CHIDX_MAX;//turn around		
	}else
		s_FMIdx--;

	halFMSet(s_FMIdx);	
	
	return;
}

WORD halFMGetFreq(void)
{
//	FMDigital = FM_FREQ_BASE+FMLevel;
	WORD wTmp = FM_FREQ_BASE + (WORD)s_FMIdx;

	//UartOutText("-I-: halFMGetFreq 0x");UartOutValue(wTmp, 4);
	return wTmp;
}

BYTE halFMGetIdx(void)
{
	//FMDigital = FM_FREQ_BASE+FMLevel;
	//WORD wTmp = FM_FREQ_BASE + s_FMIdx;

	return s_FMIdx;
}

BYTE halFMFreq2Idx(WORD wFreq)
{
	WORD wTmp = wFreq;

	//Checking parameter validation
	if((wFreq>=FM_FREQ_BASE) && (wFreq<=FM_FREQ_MAX)){
		wTmp = wTmp - FM_FREQ_BASE; 
	}else{
		wTmp = FM_CHIDX_INVALID;
	}		
	
	return (BYTE)wTmp;
}

#endif