si47xx_rx_fm.c

Si471x系列FM发射模块调试的参考程序

	if(error_ind)
		return I2C_ERROR;

	//wait CTS = 1
	do
	{	
		error_ind = OperationSi47XX_2w(READ, &(Si47XX_reg_data[0]), 1);
		if(error_ind)
			return I2C_ERROR;	
		loop_counter++;
	}
	while(((Si47XX_reg_data[0]) != 0x80) && (loop_counter < 0xff));  //loop_counter limit should guarantee at least 300us
	
	if(loop_counter >= 0xff)
		return LOOP_EXP_ERROR;	
		
	//read tune status: you should read out: {0x80,0x01,0x27,0xF6,0x2D,0x33,0x00,0x00} //Freq=0x27F6=10230KHz, RSSI=0x2D=45dBuV, SNR=0x33=51dB
	error_ind = OperationSi47XX_2w(READ, &Si47XX_reg_data[0], 8);	
	if(error_ind)
		return I2C_ERROR;
		
	if(((Si47XX_reg_data[1]&0x80) != 0))
		*SeekFail = 1;
	else
		*SeekFail = 0;
		
	if(((Si47XX_reg_data[1]&0x01) != 0))
		*valid_channel = 1;
	else
		*valid_channel = 0;
		
	*pChannel_Freq = ((Si47XX_reg_data[2] << 8) | Si47XX_reg_data[3]);

	return OK;

}

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

Si47XX_Set_FM_Frequency()

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

T_ERROR_OP Si47XX_Set_FM_Frequency(unsigned short channel_freq)
{
	if(Si47XX_FM_Tune_Freq(channel_freq) != OK) return ERROR;
	if(Si47XX_Wait_STC() != OK) return ERROR;	
	return OK;
}

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

Si47XX_FM_Seek()

SeekFail:"no any station" or not when in WRAP mode

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

T_ERROR_OP Si47XX_FM_Seek(T_SEEK_MODE seek_mode, unsigned short *pChannel_Freq, unsigned char *SeekFail)
{
	unsigned char valid_channel;
	unsigned short loop_counter = 0;

	do
	{
		if(Si47XX_FM_Seek_Start(seek_mode) != OK) return ERROR;
		if(Si47XX_Wait_STC() != OK) return ERROR;
		//read seek result:
		if(Si47XX_FM_Tune_Status(pChannel_Freq, SeekFail, &valid_channel) != OK) return ERROR;	
		
		loop_counter++;
	}
	while((valid_channel == 0) && (loop_counter < 0xff) && (*SeekFail == 0));  

	if(loop_counter >= 0xff)
		return LOOP_EXP_ERROR;
		
	if((seek_mode == SEEKDOWN_WRAP) || (seek_mode == SEEKUP_WRAP))
		if((valid_channel == 1) && (*SeekFail == 1))
			*SeekFail = 0;

	return OK;
}

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

Si47XX_FM_Seek_All()

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

T_ERROR_OP Si47XX_FM_Seek_All(unsigned short *pChannel_All_Array, unsigned char Max_Length, unsigned char *pReturn_Length)
{
	unsigned char SeekFail;
	unsigned short Channel_Result, Last_Channel = 8750;
		
	*pReturn_Length = 0;
	
	if(Si47XX_Set_FM_Frequency(8750) != OK) return ERROR;
	
	while(*pReturn_Length < Max_Length)
	{
		if(Si47XX_FM_Seek(SEEKUP_WRAP, &Channel_Result, &SeekFail) != OK) return ERROR;
			
		if(SeekFail)
			return OK;
		
		if((Channel_Result) <= Last_Channel)	
		{
			if((Channel_Result) == 8750)
			{
				*pChannel_All_Array++ = Channel_Result;
				(*pReturn_Length)++;
			}
			return OK;
		}
		else
		{
			*pChannel_All_Array++ = Last_Channel = Channel_Result;
			(*pReturn_Length)++;
		}
	}
	
	return OK;
}

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

Si47XX_FM_Get_RSSI()

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

T_ERROR_OP Si47XX_FM_Get_RSSI(unsigned char *pRSSI)
{
	unsigned short loop_counter = 0;
	unsigned char Si47XX_reg_data[32];	
	unsigned char error_ind = 0;
	unsigned char Si47XX_rsq_status[] = {0x23,0x00};	

	//send CMD
 	error_ind = OperationSi47XX_2w(WRITE, &(Si47XX_rsq_status[0]), 2);
	if(error_ind)
		return I2C_ERROR;

	//wait CTS = 1
	do
	{	
		error_ind = OperationSi47XX_2w(READ, &(Si47XX_reg_data[0]), 1);
		if(error_ind)
			return I2C_ERROR;	
		loop_counter++;
	}
	while(((Si47XX_reg_data[0]&0x80) == 0) && (loop_counter < 0xff));  //loop_counter limit should guarantee at least 300us

	if(loop_counter >= 0xff)
		return LOOP_EXP_ERROR;
	
	error_ind = OperationSi47XX_2w(READ, &(Si47XX_reg_data[0]), 8);	
	if(error_ind)
		return I2C_ERROR;
		
	*pRSSI = Si47XX_reg_data[4];
		
	return OK;	

}

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

Si47XX_FM_Valid_Stop_MTK()

only used for MTK search all...

channel_number must from 87.5,87.6,87.7... to 108

if it's valid station, *Valid_Stop = 1, or *Valid_Stop = 0

note: for MTK channel: 875, 876...

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

T_ERROR_OP Si47XX_FM_Valid_Stop_MTK(unsigned short channel_number, unsigned char *Valid_Stop)
{
	unsigned char SeekFail;
	static unsigned short last_channel_result = 0;
	/*
	static unsigned char last_channel_rssi;
	*/

  channel_number * = 10; 

	if(channel_number == 8750)
	{
		if(Si47XX_Set_FM_Frequency(10800) != OK) return ERROR;
		last_channel_result = 0;
	}
		
	if(last_channel_result > channel_number)
		*Valid_Stop = 0;
	else if(last_channel_result == channel_number)
		*Valid_Stop = 1;
	else	//if(last_channel_result < channel_number)
	{
		if(Si47XX_FM_Seek(SEEKUP_WRAP, &last_channel_result, &SeekFail) != OK) return ERROR;
			
		if(SeekFail)
			last_channel_result = 10810;
		else
		{
      /*
			DELAY(1ms);
			if(Si47XX_FM_Get_RSSI(&last_channel_rssi) != OK) return ERROR;
      */
		}
			
		if(last_channel_result > channel_number)
			*Valid_Stop = 0;
	  else if(last_channel_result == channel_number)
			*Valid_Stop = 1;
		else	//if(last_channel_result < channel_number)
		{
			*Valid_Stop = 0;
			last_channel_result = 10810;
		}

	}
	
	return OK;
}

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

Si47XX_FM_Get_SigLvl_MTK()

for the case: if(valid_stop) then (get_signal_level)

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

T_ERROR_OP Si47XX_FM_Get_SigLvl_MTK(unsigned char *pRSSI)
{
	unsigned short loop_counter = 0;
	unsigned char Si47XX_reg_data[32];	
	unsigned char error_ind = 0;
	unsigned char Si47XX_rsq_status[] = {0x23,0x00};

	DELAY(1ms);	

	//send CMD
 	error_ind = OperationSi47XX_2w(WRITE, &(Si47XX_rsq_status[0]), 2);
	if(error_ind)
		return I2C_ERROR;

	//wait CTS = 1
	do
	{	
		error_ind = OperationSi47XX_2w(READ, &(Si47XX_reg_data[0]), 1);
		if(error_ind)
			return I2C_ERROR;	
		loop_counter++;
	}
	while(((Si47XX_reg_data[0]&0x80) == 0) && (loop_counter < 0xff));  //loop_counter limit should guarantee at least 300us

	if(loop_counter >= 0xff)
		return LOOP_EXP_ERROR;
	
	error_ind = OperationSi47XX_2w(READ, &(Si47XX_reg_data[0]), 8);	
	if(error_ind)
		return I2C_ERROR;
		
	*pRSSI = Si47XX_reg_data[4];
		
	return OK;	

}

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

Si47XX_FM_Seek_MTK()

only used for MTK search all...

channel_number must from 87.5,87.6,87.7... to 108

if it's invalid station, *Return_RSSI = 0

note: for MTK channel: 875, 876...

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

T_ERROR_OP Si47XX_FM_Seek_MTK(unsigned short channel_number, unsigned char *Return_RSSI)
{
	unsigned char SeekFail;
	static unsigned short last_channel_result = 0;
	static unsigned char last_channel_rssi;


	if(channel_number == 8750)
	{
		if(Si47XX_Set_FM_Frequency(10800) != OK) return ERROR;
		last_channel_result = 0;
	}
		
	if(last_channel_result > channel_number)
		*Return_RSSI = 0;
	else if(last_channel_result == channel_number)
		*Return_RSSI = last_channel_rssi;
	else	//if(last_channel_result < channel_number)
	{
		if(Si47XX_FM_Seek(SEEKUP_WRAP, &last_channel_result, &SeekFail) != OK) return ERROR;
			
		if(SeekFail)
			last_channel_result = 10810;
		else
		{
			DELAY(1ms);
			if(Si47XX_FM_Get_RSSI(&last_channel_rssi) != OK) return ERROR;
		}
			
		if(last_channel_result > channel_number)
			*Return_RSSI = 0;
	  else if(last_channel_result == channel_number)
			*Return_RSSI = last_channel_rssi;
		else	//if(last_channel_result < channel_number)
		{
			*Return_RSSI = 0;
			last_channel_result = 10810;
		}

	}
	
	return OK;
}