PGA460-Q1: Using 2 PGAs without UART_ADDR value

Hello,

I wrote a code that is working with 2 PGA and 1 PIC microprocessor. I tried seperately both of them, these works with SPI1 and SPI2 excellent. But when I want to use 2 PGAs at the same time, it always gives 5.78mm distance. I looked  DEV_STAT0 and DEV_STAT1 values for both of them but it didnt give any error. When I use one PGA and run diagnotistics, frequency is 42,55kHz, decay period is 4080, temperature is 32, noise level is 5. But when I use two PGAs and run diagnotistics,  frequency is 5kHz, temperature is 32, noise level is 1. What is the problem? 

I changed the code's SPI parts for use 2 PGAs. You can see parts of my code. 

void pga460_spiTransfer(uint8* mosi, uint8 size )
{
	mmemset16(misoBuft_SPI1, 0x00, sizeof(misoBuft_SPI1)); // idle-low receive buffer data
	mmemset16(misoBuft_SPI2, 0x00, sizeof(misoBuft_SPI2)); // idle-low receive buffer data

	for (int i = 0; i<size; i++)
	{
		misoBuft_SPI1[i] = usscSPI1_transfer(mosi[i]);
	}

	for (int j = 0; j<size; j++)
	{
		misoBuft_SPI2[j] = usscSPI2_transfer(mosi[j]);
	}

}

void pga460_spiMosiIdle(BYTE size)
{		
	for (int i = 0; i<size; i++)
	{
		misoBuf_SPI1[i] = usscSPI1_transfer(0xFF); 
	}
	
	for (int j = 0; j<size; j++)
	{
		misoBuf_SPI2[j] = usscSPI2_transfer(0xFF); 
	}
	
	return;
}

uint8 usscSPI1_transfer(uint8 _data1) {
	mSSP1BUF.reg = _data1;
	while(!SSP1STATbitsBF);
	_regdata1 = mSSP1BUF.reg;
	return _regdata1;
}

uint8 usscSPI2_transfer(uint8 _data2) {
	mSSP2BUF.reg = _data2;
	while(!SSP2STATbitsBF);
	_regdata2 = mSSP2BUF.reg;
	return _regdata2;
}

I sent a data with pga460_spiTransfer function as always, it sends data to 1st PGA and 2th PGA in order. Then, it listens 1st PGA and 2th PGA in order. I know, you are not working with PIC, but I guess you can know working with PGA without UART_ADDR value. 

Apart from these, after calling pga460_spiMosiIdle function, two each register to which misoBuf value is transferred was created for SPI1 and SPI2. You can see a sample below.

double pga460_runDiagnostics(BYTE run, BYTE diag)
{
mmemset16(misoBuf_SPI1, 0x00, sizeof(misoBuf_SPI1));
mmemset16(misoBuf_SPI2, 0x00, sizeof(misoBuf_SPI2));
*
*
*
*
pga460_spiTransfer(pgau4.pga_bufdizi4, sizeof(pga_bufs4));
*
*
*
*
pga460_spiMosiIdle(3);	// MOSI transmit 0xFE to pull MISO return data
		for(int n=0; n<2; n++)
		{
		   diagMeasResult_SPI1[n] = misoBuf_SPI1[n];
		}
		
		for(int m=0; m<2; m++)
		{
		   diagMeasResult_SPI2[m] = misoBuf_SPI2[m];
		}
*
*
*
*
*	
}