public WriteRead ( byte writeBuffer, byte readBuffer ) : void | ||
writeBuffer | byte | |
readBuffer | byte | |
Résultat | void |
void TestSPI() { SPI spi = new SPI(new SPI.Configuration((Cpu.Pin)28, false, 0, 0, false, false, 1, SPI.SPI_module.SPI1)); byte[] write = new byte[] { 0, 0, 0 }; byte[] read = new byte[] { 0, 0, 0 }; spi.WriteRead(write, read, 2); spi.WriteRead(write, read, 2); }
public static void Main() { SerialPort UART = new SerialPort("COM1", 9600); SPI.Configuration config = new SPI.Configuration((Cpu.Pin)FEZ_Pin.Digital.Di10, false, 0, 0, true, true, 250, SPI.SPI_module.SPI1); SPI Spi = new SPI(config); UART.Open(); string Datoreaded = ""; byte[] datain = new byte[1]; byte[] dataout = new byte[1]; while (true) { // Sleep for 500 milliseconds Thread.Sleep(500); dataout[0] = (byte)0x55; datain[0] = (byte)0; Spi.WriteRead(dataout, datain); Datoreaded = datain[0].ToString(); Datoreaded += "\n\r"; byte[] buffer = Encoding.UTF8.GetBytes(Datoreaded); UART.Write(buffer, 0, buffer.Length); } }
public double GetValue() { _writeFrameBuffer[0] = 0x80; _writeFrameBuffer[1] = 0x01; // Module command 'Get ADC value' _writeFrameBuffer[_writeFrameBuffer.Length - 1] = CRC8.Compute8(_writeFrameBuffer, 0, _writeFrameBuffer.Length - 1); _spi.Write(_writeFrameBuffer); // now, wait for irq to be asserted bool responseReceived = false; int numRetries = 36; //4 int iRetry = 0; while (true) { responseReceived = _irqPortInterruptEvent.WaitOne(10, false); if (responseReceived || (iRetry >= numRetries - 1)) { // parse and return the response _writeFrameBuffer[0] = 0x00; // get data from module _writeFrameBuffer[1] = 0x00; _writeFrameBuffer[2] = 0x00; _writeFrameBuffer[3] = 0x00; _writeFrameBuffer[_writeFrameBuffer.Length - 1] = CRC8.Compute8(_writeFrameBuffer, 0, _writeFrameBuffer.Length - 1); _spi.WriteRead(_writeFrameBuffer, _readFrameBuffer); if (_readFrameBuffer[2] == 2) { // Received two byte ADC value double adcValue = ((short)((_readFrameBuffer[3] << 8) | _readFrameBuffer[4])) / (double)1023; _lastAdcValue = adcValue; return(adcValue); } else if (iRetry >= numRetries - 1) { return(_lastAdcValue); } else { // failed to receive response; retry responseReceived = false; } } else { // TODO: limit our retries to a handful of retries (or maybe a few dozen -- quickly) // retry infinitely _writeFrameBuffer[0] = 0x80; _writeFrameBuffer[1] = 0x01; // Module command 'Get ADC value' _writeFrameBuffer[_writeFrameBuffer.Length - 1] = CRC8.Compute8(_writeFrameBuffer, 0, _writeFrameBuffer.Length - 1); _spi.Write(_writeFrameBuffer); } iRetry++; } }
public static void Main() { SPI.Configuration[] max6675SpiCfg; // variables that will be used to extract the information from // the incoming serial bits from the MAX6675 chip byte[] outBfr = new byte[2]; byte[] inBfr = new byte[2]; // data will be used to store the extracted information short data; double tempF; double tempC; double tempK; int count = 0; max6675SpiCfg = new SPI.Configuration[1]; max6675SpiCfg[0] = new SPI.Configuration( Pins.GPIO_PIN_D8, // CS to digtalOut pin 9 false, // CS pin active state 0, // CS port set up time 0, // CS port hold time false, // Idle state of clock true, // Signal edge to sample on 1000, // Clock speed in KHz SPI_Devices.SPI1 // Using SPI bus 1 ); // Creating a new instance of SPI object max6675Spi = new SPI (max6675SpiCfg[0]); //Reading from MAX6675 board and displaying data while(true) { max6675Spi.Config = max6675SpiCfg[0]; max6675Spi.WriteRead(outBfr, inBfr); data = (short) (inBfr[0] << 5 | inBfr[1] >> 3); tempC = data / 4.0; tempK = tempC + 273.15; tempF = tempC * 1.8 + 32.0; // using debug to output the information to the computer screen Debug.Print(" Reading:" + count.ToString("F")); Debug.Print(" Temp F:" + tempF.ToString("F")); Debug.Print(" Temp C:" + tempC.ToString("F")); Debug.Print(" "); Thread.Sleep(500); count++; } }
//Read the status register and returns the byte private byte ReadStatusRegister() { byte[] Temp = new byte[1]; byte[] TempIn = new byte[1]; Temp[0] = (byte)OpCode.RDSR_ReadStatusReg; Microsoft.SPOT.Hardware.SPI _SPIDevice = Hardware.SPI1.Get(_Configuration); _SPIDevice.WriteRead(Temp, 0, 1, TempIn, 0, 1, 1); return(TempIn[0]); }
public static uint GetVersion(SPI spi) { uint RetVal; var TxBuffer = new byte[6]; var RxBuffer = new byte[6]; TxBuffer[0] = 0xFF; TxBuffer[1] = 0x00; TxBuffer[2] = 0x00; TxBuffer[3] = 0x00; TxBuffer[4] = 0x00; TxBuffer[5] = 0x00; spi.WriteRead(TxBuffer, RxBuffer); RetVal = (uint)((RxBuffer[2] << 24) + (RxBuffer[3] << 16) + (RxBuffer[4] << 8) + (RxBuffer[5])); return RetVal; }
public static uint GetMemory(SPI spi, byte address) { uint RetVal; var TxBuffer = new byte[6]; var RxBuffer = new byte[6]; TxBuffer[0] = 0x00; TxBuffer[1] = address; TxBuffer[2] = 0x00; TxBuffer[3] = 0x00; TxBuffer[4] = 0x00; TxBuffer[5] = 0x00; spi.WriteRead(TxBuffer, RxBuffer); RetVal = (uint)((RxBuffer[2] << 24) + (RxBuffer[3] << 16) + (RxBuffer[4] << 8) + (RxBuffer[5])); return RetVal; }
public static int ReadReg(SPI spi, byte Addr) { int RetVal; var TxBuffer = new byte[6]; var RxBuffer = new byte[6]; TxBuffer[0] = 0x00; TxBuffer[1] = Addr; TxBuffer[2] = 0x00; TxBuffer[3] = 0x00; TxBuffer[4] = 0x00; TxBuffer[5] = 0x00; spi.WriteRead(TxBuffer, RxBuffer); RetVal = (int)((RxBuffer[2] << 24) + (RxBuffer[3] << 16) + (RxBuffer[4] << 8) + (RxBuffer[5])); return RetVal; }
//Read multiple address and store data into byte buffer; public void ReadMultiple(ulong Address, int Numb_of_Bytes, byte[] DestBuffer) { byte[] Temp = new byte[4]; Wait_Busy(); byte Byte1 = (byte)((Address & 0xFFFFFF) >> 16); byte Byte2 = (byte)((Address & 0xFFFF) >> 8); byte Byte3 = (byte)(Address & 0xFF); Temp[0] = (byte)OpCode.Read; Temp[1] = Byte1; Temp[2] = Byte2; Temp[3] = Byte3; Microsoft.SPOT.Hardware.SPI _SPIDevice = Hardware.SPI1.Get(_Configuration); _SPIDevice.WriteRead(Temp, 0, 4, DestBuffer, 0, Numb_of_Bytes, 4); }
//Good public uint ReadJedecID() { byte[] outBytes = new byte[4] { (byte)OpCode.JEDECID, 0x00, 0x00, 0x00 }; byte[] inBytes = new byte[4]; Microsoft.SPOT.Hardware.SPI _SPIDevice = Hardware.SPI1.Get(_Configuration); _SPIDevice.WriteRead(outBytes, inBytes); uint retval = inBytes[1]; retval <<= 8; retval |= inBytes[2]; retval <<= 8; retval |= inBytes[3]; return(retval); }
public static void Main() { byte[] TxBuff = new byte[4]{0x9F,0xA5,0xA5,0xA5}; byte[] RxBuff = new byte[4]; SPI.Configuration SPI_Config = new SPI.Configuration(Pins.GPIO_PIN_D10, false, 0, 1, false, true, 1000,SPI.SPI_module.SPI1); //the 6th parameter, clock edge ,only care whether MOSI data is latched on the SPI Clock rising edge(true) or falling edge(falling),not the MISO. SPI SPI1 = new SPI(SPI_Config); while (true) { SPI1.WriteRead(TxBuff, RxBuff); Debug.Print("Manufacture ID:"+RxBuff[1].ToString("X")); Debug.Print("Device ID High byte:"+RxBuff[2].ToString("X")); Debug.Print("Device ID Low byte:"+RxBuff[3].ToString("X")); Thread.Sleep(500); } // write your code here }
private void GetColor(out byte red, out byte green, out byte blue) { _writeFrameBuffer[0] = 0x80; _writeFrameBuffer[1] = 0x01; // Module command 'Get RGB LED color values' for (int i = 2; i < _writeFrameBuffer.Length - 1; i++) { _writeFrameBuffer[i] = 0x00; } _writeFrameBuffer[_writeFrameBuffer.Length - 1] = CRC8.Compute8(_writeFrameBuffer, 0, _writeFrameBuffer.Length - 1); _spi.Write(_writeFrameBuffer); // now, wait for irq to be asserted bool responseReceived = false; int numRetries = 4; int iRetry = 0; while (true) { responseReceived = _irqPortInterruptEvent.WaitOne(3, false); if (responseReceived || (iRetry >= numRetries - 1)) { // parse and return the response _writeFrameBuffer[0] = 0x00; // get data from module _writeFrameBuffer[1] = 0x00; _writeFrameBuffer[2] = 0x00; _writeFrameBuffer[3] = 0x00; _writeFrameBuffer[_writeFrameBuffer.Length - 1] = CRC8.Compute8(_writeFrameBuffer, 0, _writeFrameBuffer.Length - 1); _spi.WriteRead(_writeFrameBuffer, _readFrameBuffer); if (_readFrameBuffer[2] == 3) { // Received three byte RGB value red = _readFrameBuffer[3]; green = _readFrameBuffer[4]; blue = _readFrameBuffer[5]; return; } else if (iRetry >= numRetries - 1) { red = 0; blue = 0; green = 0; return; } else { // failed to receive response; retry responseReceived = false; } } else { // TODO: limit our retries to a handful of retries (or maybe a few dozen -- quickly) // retry infinitely _writeFrameBuffer[0] = 0x80; _writeFrameBuffer[1] = 0x01; // Module command 'Get RGB LED color values' _writeFrameBuffer[_writeFrameBuffer.Length - 1] = CRC8.Compute8(_writeFrameBuffer, 0, _writeFrameBuffer.Length - 1); _spi.Write(_writeFrameBuffer); } iRetry++; } }
public static void RedLEDOn(SPI spi) { byte[] TxBuffer = { 0x04, 0x01 }; byte[] RxBuffer = new byte[2]; spi.WriteRead(TxBuffer, RxBuffer); }
public static void SetTerminate(SPI spi, int Data) { var TxBuffer = new byte[6]; var RxBuffer = new byte[6]; TxBuffer[0] = 0x05; TxBuffer[1] = 0x00; TxBuffer[2] = (byte)(Data >> 24 & 0xFF); TxBuffer[3] = (byte)(Data >> 16 & 0xFF); TxBuffer[4] = (byte)(Data >> 8 & 0xFF); TxBuffer[5] = (byte)(Data & 0xFF); spi.WriteRead(TxBuffer, RxBuffer); }
public static void WriteReg(SPI spi, byte Addr, int Data) { var TxBuffer = new byte[6]; var RxBuffer = new byte[6]; TxBuffer[0] = 0x01; TxBuffer[1] = Addr; TxBuffer[2] = (byte)(Data >> 24 & 0xFF); TxBuffer[3] = (byte)(Data >> 16 & 0xFF); TxBuffer[4] = (byte)(Data >> 8 & 0xFF); TxBuffer[5] = (byte)(Data & 0xFF); spi.WriteRead(TxBuffer, RxBuffer); }
public static void GreenLEDOff(SPI spi) { byte[] TxBuffer = { 0x03, 0x00 }; byte[] RxBuffer = new byte[2]; spi.WriteRead(TxBuffer, RxBuffer); }
private void GetFrequency(out double frequency) { _writeFrameBuffer[0] = 0x80; _writeFrameBuffer[1] = 0x01; // Module command 'Get frequency' for (int i = 2; i < _writeFrameBuffer.Length - 1; i++) { _writeFrameBuffer[i] = 0x00; } _writeFrameBuffer[_writeFrameBuffer.Length - 1] = CRC8.Compute8(_writeFrameBuffer, 0, _writeFrameBuffer.Length - 1); _spi.Write(_writeFrameBuffer); // now, wait for irq to be asserted bool responseReceived = false; int numRetries = 4; int iRetry = 0; while (true) { responseReceived = _irqPortInterruptEvent.WaitOne(10, false); if (responseReceived || (iRetry >= numRetries - 1)) { // parse and return the response _writeFrameBuffer[0] = 0x00; // get data from module _writeFrameBuffer[1] = 0x00; _writeFrameBuffer[2] = 0x00; _writeFrameBuffer[3] = 0x00; _writeFrameBuffer[_writeFrameBuffer.Length - 1] = CRC8.Compute8(_writeFrameBuffer, 0, _writeFrameBuffer.Length - 1); _spi.WriteRead(_writeFrameBuffer, _readFrameBuffer); if (_readFrameBuffer[2] == 2) { // Received three byte RGB value byte frequencyHighByte = _readFrameBuffer[3]; byte frequencyLowByte = _readFrameBuffer[4]; int divider = (int)((frequencyHighByte << 8) | frequencyLowByte); frequency = (divider > 0) ? 1000000F / divider : 0F; return; } else if (iRetry >= numRetries - 1) { frequency = 0F; return; } else { // failed to receive response; retry responseReceived = false; } } else { // TODO: limit our retries to a handful of retries (or maybe a few dozen -- quickly) // retry infinitely _writeFrameBuffer[0] = 0x80; _writeFrameBuffer[1] = 0x01; // Module command 'Get frequency' _writeFrameBuffer[_writeFrameBuffer.Length - 1] = CRC8.Compute8(_writeFrameBuffer, 0, _writeFrameBuffer.Length - 1); _spi.Write(_writeFrameBuffer); } iRetry++; } }
public static void PWMStop(SPI spi) { byte[] TxBuffer = { 0x02, 0x00 }; byte[] RxBuffer = new byte[2]; spi.WriteRead(TxBuffer, RxBuffer); }
private void Write(byte[] data, int dataLen) { _outRs.Write(true); _spi.WriteRead(data, 0, dataLen, null, 0, 0, 0); }
/// <summary> /// /// SPI interface for the MPL115A barometric sensor. /// Created by deepnarc, deepnarc at gmail.com /// /// Netduino platform /// /// Sensor Breakout---------Netduino /// ================================ /// SDN---------------------optional /// CSN---------------------pin 0 (user definable) /// SDO---------------------pin 12 /// SDI---------------------pin 11 /// SCK---------------------pin 13 /// GND---------------------GND /// VDO---------------------VCC (3.3V) /// /// References: (1) Freescale Semiconductor, Application Note, AN3785, Rev 5, 7/2009 by John Young /// provided the code for the manipulations of the sensor coefficients; the original comments /// were left in place without modification in that section. (2) Freescale Semiconductor, Document /// Number: MPL115A1, Rev 6, 10/2011. (3) MPL115A1 SPI Digital Barometer Test Code Created on: /// September 30, 2010 By: Jeremiah McConnell - miah at miah.com, Portions: Jim Lindblom - jim at /// sparkfun.com. (4) MPL115A1 SPI Digital Barometer Test Code Created on: April 20, 2010 By: Jim /// Lindblom - jim at sparkfun.com. /// /// </summary> public static double calculatePressure() { SPI SPI_Out = new SPI(new SPI.Configuration( (Cpu.Pin)FEZ_Pin.Digital.Di7, // SS-pin false, // SS-pin active state 0, // The setup time for the SS port 0, // The hold time for the SS port false, // The idle state of the clock true, // The sampling clock edge 1000, // The SPI clock rate in KHz SPI.SPI_module.SPI1 // The used SPI bus (refers to a MOSI MISO and SCLK pinset) ) ); string decPcomp_out; sbyte sia0MSB, sia0LSB; sbyte sib1MSB, sib1LSB; sbyte sib2MSB, sib2LSB; sbyte sic12MSB, sic12LSB; sbyte sic11MSB, sic11LSB; sbyte sic22MSB, sic22LSB; int sia0, sib1, sib2, sic12, sic11, sic22; uint uiPadc, uiTadc; byte uiPH, uiPL, uiTH, uiTL; long lt1, lt2, lt3, si_c11x1, si_a11, si_c12x2; long si_a1, si_c22x2, si_a2, si_a1x1, si_y1, si_a2x2; float siPcomp;//, decPcomp; // start pressure & temp conversions // command byte + r/w bit const byte com1_writeData = 0x24 & 0x7F; const byte com2_writeData = 0x00 & 0x7F; byte[] WriteBuffer = { com1_writeData, com2_writeData }; SPI_Out.Write(WriteBuffer); Thread.Sleep(3); // write(0x24, 0x00); // Start Both Conversions // write(0x20, 0x00); // Start Pressure Conversion // write(0x22, 0x00); // Start temperature conversion // delay_ms(10); // Typical wait time is 3ms // read pressure // address byte + r/w bit // data byte + r/w bit const byte PRESHw_writeData = 0x00 | 0x80; const byte PRESHr_writeData = 0x00 | 0x80; const byte PRESLw_writeData = 0x02 | 0x80; const byte PRESLr_writeData = 0x00 | 0x80; const byte TEMPHw_writeData = 0x04 | 0x80; const byte TEMPHr_writeData = 0x00 | 0x80; const byte TEMPLw_writeData = 0x06 | 0x80; const byte TEMPLr_writeData = 0x00 | 0x80; const byte BLANK1r_writeData = 0x00 | 0x80; byte[] press_writeData = { PRESHw_writeData, PRESHr_writeData, PRESLw_writeData, PRESLr_writeData, TEMPHw_writeData, TEMPHr_writeData, TEMPLw_writeData, TEMPLr_writeData, BLANK1r_writeData }; byte[] press_readBuffer = new byte[9]; SPI_Out.WriteRead(press_writeData, press_readBuffer); uiPH = press_readBuffer[1]; uiPL = press_readBuffer[3]; uiTH = press_readBuffer[5]; uiTL = press_readBuffer[7]; uiPadc = (uint)uiPH << 8; uiPadc += (uint)uiPL & 0x00FF; uiTadc = (uint)uiTH << 8; uiTadc += (uint)uiTL & 0x00FF; // read coefficients // address byte + r/w bit // data byte + r/w bit const byte A0MSBw_writeData = 0x08 | 0x80; const byte A0MSBr_writeData = 0x00 | 0x80; const byte A0LSBw_writeData = 0x0A | 0x80; const byte A0LSBr_writeData = 0x00 | 0x80; const byte B1MSBw_writeData = 0x0C | 0x80; const byte B1MSBr_writeData = 0x00 | 0x80; const byte B1LSBw_writeData = 0x0E | 0x80; const byte B1LSBr_writeData = 0x00 | 0x80; const byte B2MSBw_writeData = 0x10 | 0x80; const byte B2MSBr_writeData = 0x00 | 0x80; const byte B2LSBw_writeData = 0x12 | 0x80; const byte B2LSBr_writeData = 0x00 | 0x80; const byte C12MSBw_writeData = 0x14 | 0x80; const byte C12MSBr_writeData = 0x00 | 0x80; const byte C12LSBw_writeData = 0x16 | 0x80; const byte C12LSBr_writeData = 0x00 | 0x80; const byte C11MSBw_writeData = 0x18 | 0x80; const byte C11MSBr_writeData = 0x00 | 0x80; const byte C11LSBw_writeData = 0x1A | 0x80; const byte C11LSBr_writeData = 0x00 | 0x80; const byte C22MSBw_writeData = 0x1C | 0x80; const byte C22MSBr_writeData = 0x00 | 0x80; const byte C22LSBw_writeData = 0x1E | 0x80; const byte C22LSBr_writeData = 0x00 | 0x80; const byte BLANK2r_writeData = 0x00 | 0x80; byte[] coeff_writeData = { A0MSBw_writeData, A0MSBr_writeData, A0LSBw_writeData, A0LSBr_writeData, B1MSBw_writeData, B1MSBr_writeData, B1LSBw_writeData, B1LSBr_writeData, B2MSBw_writeData, B2MSBr_writeData, B2LSBw_writeData, B2LSBr_writeData, C12MSBw_writeData, C12MSBr_writeData, C12LSBw_writeData, C12LSBr_writeData, C11MSBw_writeData, C11MSBr_writeData, C11LSBw_writeData, C11LSBr_writeData, C22MSBw_writeData, C22MSBr_writeData, C22LSBw_writeData, C22LSBr_writeData, BLANK2r_writeData }; byte[] coeff_readBuffer = new byte[25]; SPI_Out.WriteRead(coeff_writeData, coeff_readBuffer); //==================================================== // MPL115A Placing Coefficients into 16 bit variables //==================================================== //coeff a0 16bit sia0MSB = (sbyte)coeff_readBuffer[1]; sia0LSB = (sbyte)coeff_readBuffer[3]; sia0 = (int)sia0MSB << 8; //s16 type //Shift to MSB sia0 += (int)sia0LSB & 0x00FF; //Add LSB to 16bit number //coeff b1 16bit sib1MSB = (sbyte)coeff_readBuffer[5]; sib1LSB = (sbyte)coeff_readBuffer[7]; sib1 = (int)sib1MSB << 8; //Shift to MSB sib1 += (int)sib1LSB & 0x00FF; //Add LSB to 16bit number //coeff b2 16bit sib2MSB = (sbyte)coeff_readBuffer[9]; sib2LSB = (sbyte)coeff_readBuffer[11]; sib2 = (int)sib2MSB << 8; //Shift to MSB sib2 += (int)sib2LSB & 0x00FF; //Add LSB to 16bit number //coeff c12 14bit sic12MSB = (sbyte)coeff_readBuffer[13]; sic12LSB = (sbyte)coeff_readBuffer[15]; sic12 = (int)sic12MSB << 8; //Shift to MSB only by 8 for MSB sic12 += (int)sic12LSB & 0x00FF; //coeff c11 11bit sic11MSB = (sbyte)coeff_readBuffer[17]; sic11LSB = (sbyte)coeff_readBuffer[19]; sic11 = (int)sic11MSB << 8; //Shift to MSB only by 8 for MSB sic11 += (int)sic11LSB & 0x00FF; //coeff c22 11bit sic22MSB = (sbyte)coeff_readBuffer[21]; sic22LSB = (sbyte)coeff_readBuffer[23]; sic22 = (int)sic22MSB << 8; //Shift to MSB only by 8 for MSB sic22 += (int)sic22LSB & 0x00FF; //=================================================== //Coefficient 9 equation compensation //=================================================== // //Variable sizes: //For placing high and low bytes of the Memory addresses for each of the 6 coefficients: //signed char (S8) sia0MSB, sia0LSB, sib1MSB,sib1LSB, sib2MSB,sib2LSB, sic12MSB,sic12LSB, sic11MSB,sic11LSB, sic22MSB,sic22LSB; // //Variable for use in the compensation, this is the 6 coefficients in 16bit form, MSB+LSB. //signed int (S16) sia0, sib1, sib2, sic12, sic11, sic22; // //Variable used to do large calculation as 3 temp variables in the process below //signed long (S32) lt1, lt2, lt3; // //Variables used for Pressure and Temperature Raw. //unsigned int (U16) uiPadc, uiTadc. //signed (N=number of bits in coefficient, F-fractional bits) //s(N,F) //The below Pressure and Temp or uiPadc and uiTadc are shifted from the MSB+LSB values to remove the zeros in the LSB since this // 10bit number is stored in 16 bits. i.e 0123456789XXXXXX becomes 0000000123456789 uiPadc = uiPadc >> 6; //Note that the PressCntdec is the raw value from the MPL115A data address. Its shifted >>6 since its 10 bit. uiTadc = uiTadc >> 6; //Note that the TempCntdec is the raw value from the MPL115A data address. Its shifted >>6 since its 10 bit. //******* STEP 1 c11x1= c11 * Padc lt1 = (long)sic11; // s(16,27) s(N,F+zeropad) goes from s(11,10)+11ZeroPad = s(11,22) => Left Justified = s(16,27) lt2 = (long)uiPadc; // u(10,0) s(N,F) lt3 = lt1 * lt2; // s(26,27) /c11*Padc si_c11x1 = (long)lt3; // s(26,27)- EQ 1 =c11x1 /checked //divide this hex number by 2^30 to get the correct decimal value. //b1 =s(14,11) => s(16,13) Left justified //******* STEP 2 a11= b1 + c11x1 lt1 = ((long)sib1) << 14; // s(30,27) b1=s(16,13) Shift b1 so that the F matches c11x1(shift by 14) lt2 = (long)si_c11x1; // s(26,27) //ensure fractional bits are compatible lt3 = lt1 + lt2; // s(30,27) /b1+c11x1 si_a11 = (long)(lt3 >> 14); // s(16,13) - EQ 2 =a11 Convert this block back to s(16,X) //******* STEP 3 c12x2= c12 * Tadc // sic12 is s(14,13)+9zero pad = s(16,15)+9 => s(16,24) left justified lt1 = (long)sic12; // s(16,24) lt2 = (long)uiTadc; // u(10,0) lt3 = lt1 * lt2; // s(26,24) si_c12x2 = (long)lt3; // s(26,24) - EQ 3 =c12x2 /checked //******* STEP 4 a1= a11 + c12x2 lt1 = ((long)si_a11 << 11); // s(27,24) This is done by s(16,13) <<11 goes to s(27,24) to match c12x2's F part lt2 = (long)si_c12x2; // s(26,24) lt3 = lt1 + lt2; // s(27,24) /a11+c12x2 si_a1 = (long)lt3 >> 11; // s(16,13) - EQ 4 =a1 /check //******* STEP 5 c22x2= c22 * Tadc // c22 is s(11,10)+9zero pad = s(11,19) => s(16,24) left justified lt1 = (long)sic22; // s(16,30) This is done by s(11,10) + 15 zero pad goes to s(16,15)+15, to s(16,30) lt2 = (long)uiTadc; // u(10,0) lt3 = lt1 * lt2; // s(26,30) /c22*Tadc si_c22x2 = (long)(lt3); // s(26,30) - EQ 5 /=c22x2 //******* STEP 6 a2= b2 + c22x2 //WORKS and loses the least in data. One extra execution. Note how the 31 is really a 32 due to possible overflow. // b2 is s(16,14) User shifted left to => s(31,29) to match c22x2 F value lt1 = ((long)sib2 << 15); //s(31,29) lt2 = ((long)si_c22x2 >> 1); //s(25,29) s(26,30) goes to >>16 s(10,14) to match F from sib2 lt3 = lt1 + lt2; //s(32,29) but really is a s(31,29) due to overflow the 31 becomes a 32. si_a2 = ((long)lt3 >> 16); //s(16,13) //******* STEP 7 a1x1= a1 * Padc lt1 = (long)si_a1; // s(16,13) lt2 = (long)uiPadc; // u(10,0) lt3 = lt1 * lt2; // s(26,13) /a1*Padc si_a1x1 = (long)(lt3); // s(26,13) - EQ 7 /=a1x1 /check //******* STEP 8 y1= a0 + a1x1 // a0 = s(16,3) lt1 = ((long)sia0 << 10); // s(26,13) This is done since has to match a1x1 F value to add. So S(16,3) <<10 = S(26,13) lt2 = (long)si_a1x1; // s(26,13) lt3 = lt1 + lt2; // s(26,13) /a0+a1x1 si_y1 = ((long)lt3 >> 10); // s(16,3) - EQ 8 /=y1 /check //******* STEP 9 a2x2= a2 *Tadc lt1 = (long)si_a2; // s(16,13) lt2 = (long)uiTadc; // u(10,0) lt3 = lt1 * lt2; // s(26,13) /a2*Tadc si_a2x2 = (long)(lt3); // s(26,13) - EQ 9 /=a2x2 //******* STEP 10 pComp = y1 +a2x2 // y1= s(16,3) lt1 = ((long)si_y1 << 10); // s(26,13) This is done to match a2x2 F value so addition can match. s(16,3) <<10 lt2 = (long)si_a2x2; // s(26,13) lt3 = lt1 + lt2; // s(26,13) /y1+a2x2 // FIXED POINT RESULT WITH ROUNDING: siPcomp = (long)lt3 >> 13; // goes to no fractional parts since this is an ADC count. //decPcomp is defined as a floating point number. //Conversion to Decimal value from 1023 ADC count value. ADC counts are 0 to 1023. Pressure is 50 to 115kPa correspondingly. var decPcomp = (double)((65.0 / 1023.0) * siPcomp) + 50; var decPcompHg = decPcomp*0.295300586466965; decPcomp_out = decPcomp.ToString(); Debug.Print("decPcomp: " + decPcomp_out + " millibars: " + decPcompHg); SPI_Out.Dispose(); return decPcompHg; }