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Hi experts,
Dear Scott,
The customer has confirmed the basic operation through PGA300 GUI and USB2ANY.
Hi IK,
Attached is a calibration coefficient generation code example in C# using the coefficient gen dll function.
#region Calibrate_Coefficients
case 100: // Do the Magic - Calibrate the coefficient values
double[] dac_k = new double[4];
double[] dac_n = new double[4];
double[] temp1 = new double[4];
double[] temp2 = new double[4];
// THE CODE BELOW WILL GENERATE k AND n LINEARITY COEFFICIENTS
// WHICH WILL BE LATER USED FOR DAC LINEARIZATION
// Note: This is only for DAC since the DAC might be non-linear when converting code into Voltage
// If the output data is read by a digital interface (For Example I2C) this is not needed
temp2[0] = Tools.StringBase16IntoDouble(Calib_P1DAC_box.Text) / 16384;
temp2[1] = Tools.StringBase16IntoDouble(Calib_P2DAC_box.Text) / 16384;
temp2[2] = Tools.StringBase16IntoDouble(Calib_P3DAC_box.Text) / 16384;
temp2[3] = Tools.StringBase16IntoDouble(Calib_P4DAC_box.Text) / 16384;
if (Calib_ModelSel_combo.Text != "4 Pressure, 4 Temperature") temp2[2] = (temp2[1] + temp2[3]) / 2;
//k1 and n1
temp1[0] = Tools.StringBase10_Into_Double(Calib_T1Vo1_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
temp1[1] = Tools.StringBase10_Into_Double(Calib_T1Vo2_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
temp1[2] = Tools.StringBase10_Into_Double(Calib_T1Vo3_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
temp1[3] = Tools.StringBase10_Into_Double(Calib_T1Vo4_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
if (Calib_ModelSel_combo.Text != "4 Pressure, 4 Temperature") temp1[2] = (temp1[1] + temp1[3]) / 2;
Calc_Slope_Intercept(temp1, temp2, ref dac_k[0], ref dac_n[0]);
//k2 and n2
temp1[0] = Tools.StringBase10_Into_Double(Calib_T2Vo1_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
temp1[1] = Tools.StringBase10_Into_Double(Calib_T2Vo2_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
temp1[2] = Tools.StringBase10_Into_Double(Calib_T2Vo3_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
temp1[3] = Tools.StringBase10_Into_Double(Calib_T2Vo4_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
if (Calib_ModelSel_combo.Text != "4 Pressure, 4 Temperature") temp1[2] = (temp1[1] + temp1[3]) / 2;
Calc_Slope_Intercept(temp1, temp2, ref dac_k[1], ref dac_n[1]);
//k3 and n3
temp1[0] = Tools.StringBase10_Into_Double(Calib_T3Vo1_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
temp1[1] = Tools.StringBase10_Into_Double(Calib_T3Vo2_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
temp1[2] = Tools.StringBase10_Into_Double(Calib_T3Vo3_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
temp1[3] = Tools.StringBase10_Into_Double(Calib_T3Vo4_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
if (Calib_ModelSel_combo.Text != "4 Pressure, 4 Temperature") temp1[2] = (temp1[1] + temp1[3]) / 2;
Calc_Slope_Intercept(temp1, temp2, ref dac_k[2], ref dac_n[2]);
//k4 and n4
temp1[0] = Tools.StringBase10_Into_Double(Calib_T4Vo1_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
temp1[1] = Tools.StringBase10_Into_Double(Calib_T4Vo2_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
temp1[2] = Tools.StringBase10_Into_Double(Calib_T4Vo3_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
temp1[3] = Tools.StringBase10_Into_Double(Calib_T4Vo4_box.Text) / Tools.StringBase10_Into_Double(Calib_VDDSupply_box.Text);
if (Calib_ModelSel_combo.Text != "4 Pressure, 4 Temperature") temp1[2] = (temp1[1] + temp1[3]) / 2;
Calc_Slope_Intercept(temp1, temp2, ref dac_k[3], ref dac_n[3]);
// THE CODE BELOW WILL MAP THE DAC NON-LINEARITY TO THE
// LINEAR DESIRED OUTPUT
//Generate Desired DAC LSBs
temp2[0] = Tools.StringBase10_Into_Double(Calib_P1Vo_box.Text) / 5 * 16384; // 5V assumed VDD, 16384 because the DAC is 14 bits (2^14 = 16384)
temp2[1] = Tools.StringBase10_Into_Double(Calib_P2Vo_box.Text) / 5 * 16384; // 5V assumed VDD
temp2[2] = Tools.StringBase10_Into_Double(Calib_P3Vo_box.Text) / 5 * 16384; // 5V assumed VDD
temp2[3] = Tools.StringBase10_Into_Double(Calib_P4Vo_box.Text) / 5 * 16384; // 5V assumed VDD
//
// Populate DAC Linearization Matrix
double[] DACs_fixed = new double[16];
DACs_fixed[0] = dac_k[0] * temp2[0] + dac_n[0];
DACs_fixed[4] = dac_k[0] * temp2[1] + dac_n[0];
DACs_fixed[8] = dac_k[0] * temp2[2] + dac_n[0];
DACs_fixed[12] = dac_k[0] * temp2[3] + dac_n[0];
DACs_fixed[1] = dac_k[1] * temp2[0] + dac_n[1];
DACs_fixed[5] = dac_k[1] * temp2[1] + dac_n[1];
DACs_fixed[9] = dac_k[1] * temp2[2] + dac_n[1];
DACs_fixed[13] = dac_k[1] * temp2[3] + dac_n[1];
DACs_fixed[2] = dac_k[2] * temp2[0] + dac_n[2];
DACs_fixed[6] = dac_k[2] * temp2[1] + dac_n[2];
DACs_fixed[10] = dac_k[2] * temp2[2] + dac_n[2];
DACs_fixed[14] = dac_k[2] * temp2[3] + dac_n[2];
DACs_fixed[3] = dac_k[3] * temp2[0] + dac_n[3];
DACs_fixed[7] = dac_k[3] * temp2[1] + dac_n[3];
DACs_fixed[11] = dac_k[3] * temp2[2] + dac_n[3];
DACs_fixed[15] = dac_k[3] * temp2[3] + dac_n[3];
//Populate P ADC Linearization Matrix
double[] PADCs = new double[16];
PADCs[0] = Tools.StringBase16IntoDouble(Calib_P1T1_ADC_box.Text);
PADCs[4] = Tools.StringBase16IntoDouble(Calib_P2T1_ADC_box.Text);
PADCs[8] = Tools.StringBase16IntoDouble(Calib_P3T1_ADC_box.Text);
PADCs[12] = Tools.StringBase16IntoDouble(Calib_P4T1_ADC_box.Text);
PADCs[1] = Tools.StringBase16IntoDouble(Calib_P1T2_ADC_box.Text);
PADCs[5] = Tools.StringBase16IntoDouble(Calib_P2T2_ADC_box.Text);
PADCs[9] = Tools.StringBase16IntoDouble(Calib_P3T2_ADC_box.Text);
PADCs[13] = Tools.StringBase16IntoDouble(Calib_P4T2_ADC_box.Text);
PADCs[2] = Tools.StringBase16IntoDouble(Calib_P1T3_ADC_box.Text);
PADCs[6] = Tools.StringBase16IntoDouble(Calib_P2T3_ADC_box.Text);
PADCs[10] = Tools.StringBase16IntoDouble(Calib_P3T3_ADC_box.Text);
PADCs[14] = Tools.StringBase16IntoDouble(Calib_P4T3_ADC_box.Text);
PADCs[3] = Tools.StringBase16IntoDouble(Calib_P1T4_ADC_box.Text);
PADCs[7] = Tools.StringBase16IntoDouble(Calib_P2T4_ADC_box.Text);
PADCs[11] = Tools.StringBase16IntoDouble(Calib_P3T4_ADC_box.Text);
PADCs[15] = Tools.StringBase16IntoDouble(Calib_P4T4_ADC_box.Text);
//Populate T ADC Linearization Matrix
double[] TADCs = new double[16];
TADCs[0] = Tools.StringBase16IntoDouble(Calib_T1_TADC_box.Text);
TADCs[4] = Tools.StringBase16IntoDouble(Calib_T1_TADC_box.Text);
TADCs[8] = Tools.StringBase16IntoDouble(Calib_T1_TADC_box.Text);
TADCs[12] = Tools.StringBase16IntoDouble(Calib_T1_TADC_box.Text);
TADCs[1] = Tools.StringBase16IntoDouble(Calib_T2_TADC_box.Text);
TADCs[5] = Tools.StringBase16IntoDouble(Calib_T2_TADC_box.Text);
TADCs[9] = Tools.StringBase16IntoDouble(Calib_T2_TADC_box.Text);
TADCs[13] = Tools.StringBase16IntoDouble(Calib_T2_TADC_box.Text);
TADCs[2] = Tools.StringBase16IntoDouble(Calib_T3_TADC_box.Text);
TADCs[6] = Tools.StringBase16IntoDouble(Calib_T3_TADC_box.Text);
TADCs[10] = Tools.StringBase16IntoDouble(Calib_T3_TADC_box.Text);
TADCs[14] = Tools.StringBase16IntoDouble(Calib_T3_TADC_box.Text);
TADCs[3] = Tools.StringBase16IntoDouble(Calib_T4_TADC_box.Text);
TADCs[7] = Tools.StringBase16IntoDouble(Calib_T4_TADC_box.Text);
TADCs[11] = Tools.StringBase16IntoDouble(Calib_T4_TADC_box.Text);
TADCs[15] = Tools.StringBase16IntoDouble(Calib_T4_TADC_box.Text);
for (int i = 0; i < 16; i++) //Take care of 2's Complement
{
if (PADCs[i] > 32767) PADCs[i] = PADCs[i] - 65536; //Here the Data is 16bits from the ADC
if (TADCs[i] > 32767) TADCs[i] = TADCs[i] - 65536; // hence the values 65536 (Full ADC Span) and 32767 (Max Positive value)
}
//Now Calibrate the coefficients and digital gain/offset by using the external dll function
double[] Coefficients_norm = new double[16];
double[] Coefficients_off = new double[16];
int[] Coeff_array_size = new int[2];
double Temp_offset_norm = 0;
double Temp_offset_off = 0;
double Temp_gain_norm = 0;
double Temp_gain_off = 0;
double Press_offset_norm = 0;
double Press_offset_off = 0;
double Press_gain_norm = 0;
double Press_gain_off = 0;
double Fit_Error_norm = 0;
double Fit_Error_off = 0;
// INPUT PARAMETERS INTO Calibration_Coeff_Gen function
// CalPoint: 0 - 3P1T Calibration
// 1 - 3P3T Calibration
// 2 - 4P4T Calibration
// Off_Enable: 0 - Normal Version i.e. Fixed_ADC = GAIN * ADC + OFFSET
// 1 - Offset Version i.e. Fixed_ADC = GAIN * (ADC + OFFSET)
// NormScaleBits: Number of bits to Normalize (For PGA300, PGA302 and PGA304 it is always 14 bits)
// (For PGA305 it is always 22 bits)
if (Calib_ModelSel_combo.Text == "4 Pressure, 4 Temperature")
{
Calibration_Coeff_Gen(2, 0, 14, PADCs, TADCs, DACs_fixed, Coefficients_norm, Coeff_array_size, ref Temp_offset_norm, ref Temp_gain_norm, ref Press_offset_norm, ref Press_gain_norm, ref Fit_Error_norm);
Calibration_Coeff_Gen(2, 1, 14, PADCs, TADCs, DACs_fixed, Coefficients_off, Coeff_array_size, ref Temp_offset_off, ref Temp_gain_off, ref Press_offset_off, ref Press_gain_off, ref Fit_Error_off);
}
else if (Calib_ModelSel_combo.Text == "3 Pressure, 3 Temperature")
{
Calibration_Coeff_Gen(1, 0, 14, PADCs, TADCs, DACs_fixed, Coefficients_norm, Coeff_array_size, ref Temp_offset_norm, ref Temp_gain_norm, ref Press_offset_norm, ref Press_gain_norm, ref Fit_Error_norm);
Calibration_Coeff_Gen(1, 1, 14, PADCs, TADCs, DACs_fixed, Coefficients_off, Coeff_array_size, ref Temp_offset_off, ref Temp_gain_off, ref Press_offset_off, ref Press_gain_off, ref Fit_Error_off);
}
else if (Calib_ModelSel_combo.Text == "3 Pressure, 1 Temperature")
{
Calibration_Coeff_Gen(0, 0, 14, PADCs, TADCs, DACs_fixed, Coefficients_norm, Coeff_array_size, ref Temp_offset_norm, ref Temp_gain_norm, ref Press_offset_norm, ref Press_gain_norm, ref Fit_Error_norm);
Calibration_Coeff_Gen(0, 1, 14, PADCs, TADCs, DACs_fixed, Coefficients_off, Coeff_array_size, ref Temp_offset_off, ref Temp_gain_off, ref Press_offset_off, ref Press_gain_off, ref Fit_Error_off);
}
if (Fit_Error_norm == 1 && Fit_Error_off == 1)
{
Calib_Status_box.Text = "Error: Calibration Completed with unsuccessful results.\r\nInfo: Please Check your system settings and configuration and try again.\r\nInfo: If the issue persists please contact Texas Instruments Support.\r\n";
Calib_CANCEL_button.PerformClick();
break;
}
// The code below will decide which Version (Normal or Offset) has calculated a lower Simulated Error
// and will propose those calibration values.
if (Fit_Error_norm < Fit_Error_off) // Normal Version Wins
{
for (int i = 0; i < 16; i++)
Calib_Coefficients_final[i] = (int)(Coefficients_norm[i] * 16384); //16384 because NormScaleBits = 14
Calib_Temp_offset_final = (int)Temp_offset_norm;
Calib_Temp_gain_final = (int)Temp_gain_norm;
Calib_Press_offset_final = (int)Press_offset_norm;
Calib_Press_gain_final = (int)Press_gain_norm;
Calib_Norm_notOff = true;
Calib_Status_box.Text = "Info: Calibration Completed. Normal mode Algorithm used for lowest error.\r\n";
Calib_Status_box.Text += "Info: Simulated Fit Error Value = " + Fit_Error_norm.ToString() + "\r\n";
}
else // Offset Version Wins
{
for (int i = 0; i < 16; i++)
Calib_Coefficients_final[i] = (int)(Coefficients_off[i] * 16384); //16384 because NormScaleBits = 14
Calib_Temp_offset_final = (int)Temp_offset_off;
Calib_Temp_gain_final = (int)Temp_gain_off;
Calib_Press_offset_final = (int)Press_offset_off;
Calib_Press_gain_final = (int)Press_gain_off;
Calib_Norm_notOff = false;
Calib_Status_box.Text = "Info: Calibration Completed. Offset mode Algorithm used for lowest error.\r\n";
Calib_Status_box.Text += "Info: Simulated Fit Error Value = " + Fit_Error_off.ToString() + "\r\n";
}
Calib_Status_box.Text += "\r\n";
Calib_Status_box.Text += "Info: Best Fit Calibrated Coefficients Results:\r\n";
Calib_Status_box.Text += "H0 = " + Calib_Coefficients_final[0].ToString() + "\r\n";
Calib_Status_box.Text += "H1 = " + Calib_Coefficients_final[1].ToString() + "\r\n";
Calib_Status_box.Text += "H2 = " + Calib_Coefficients_final[2].ToString() + "\r\n";
Calib_Status_box.Text += "H3 = " + Calib_Coefficients_final[3].ToString() + "\r\n";
Calib_Status_box.Text += "G0 = " + Calib_Coefficients_final[4].ToString() + "\r\n";
Calib_Status_box.Text += "G1 = " + Calib_Coefficients_final[5].ToString() + "\r\n";
Calib_Status_box.Text += "G2 = " + Calib_Coefficients_final[6].ToString() + "\r\n";
Calib_Status_box.Text += "G3 = " + Calib_Coefficients_final[7].ToString() + "\r\n";
Calib_Status_box.Text += "N0 = " + Calib_Coefficients_final[8].ToString() + "\r\n";
Calib_Status_box.Text += "N1 = " + Calib_Coefficients_final[9].ToString() + "\r\n";
Calib_Status_box.Text += "N2 = " + Calib_Coefficients_final[10].ToString() + "\r\n";
Calib_Status_box.Text += "N3 = " + Calib_Coefficients_final[11].ToString() + "\r\n";
Calib_Status_box.Text += "M0 = " + Calib_Coefficients_final[12].ToString() + "\r\n";
Calib_Status_box.Text += "M1 = " + Calib_Coefficients_final[13].ToString() + "\r\n";
Calib_Status_box.Text += "M2 = " + Calib_Coefficients_final[14].ToString() + "\r\n";
Calib_Status_box.Text += "M3 = " + Calib_Coefficients_final[15].ToString() + "\r\n";
Calib_Status_box.Text += "\r\n";
Calib_Status_box.Text += "Info: Best Fit Gain and Offset Results:\r\n";
Calib_Status_box.Text += "Pressure (PADC) Gain = " + Calib_Press_gain_final.ToString() + "\r\n";
Calib_Status_box.Text += "Pressure (PADC) Offset = " + Calib_Press_offset_final.ToString() + "\r\n";
Calib_Status_box.Text += "Temperature (TADC) Gain = " + Calib_Temp_gain_final.ToString() + "\r\n";
Calib_Status_box.Text += "Temperature (TADC) Offset = " + Calib_Temp_offset_final.ToString() + "\r\n";
Calib_Status_box.Text += "\r\n";
Calib_Status_box.Text += "\r\n";
Calib_Status_box.Text += "To Program the Calculated Parameters to EEPROM click PROGRAM, otherwise click CANCEL.\r\n";
Calib_START_NEXT_button.Text = "PROGRAM";
calib_state_indx = 200;
// Note: Keep in mind that even after this code has completed the Calibration Coefficients are still in the Decimal format.
// The following case 200 (case "PROGRAM") which is not shown here will convert the decimal values into 2's complement HEX values.
// For PGA300, PGA302 and PGA304 these are 16 bits including the sign bit, for PGA305 these are 24 bits including the sign bit.
break;
#endregion
Regards,
dear Scott.
Thank you for your kind support.
It is very help to me.
Thank you.
Br IK.