Re: lambdaShield2 sketch & hardware
Posted: 30 Jun 2020 23:20
YFM 660R with AFR gauge
I also added a modified sketch. (function delay replaced with a timer1 ISR-->analogWrite at Arduino Pin5 and 6 uses timer0 as "delay" does.., digitalWrite replaced with a bitbanging procedure, watchdog routine implemented in the loop function and a few minor changes
https://www.file-upload.net/download-14 ... e.rar.html
Code: Select all
/*
Example code compatible with the Lambda Shield for Arduino.
Copyright (C) 2017 - 2020 Bylund Automotive AB.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
C:\Programme\arduino-1.8.5_normal\hardware\arduino\avr\cores\arduino/wiring_analog.c --> source analogWrite()
Contact information of author:
http://www.bylund-automotive.com/
info@bylund-automotive.com
Version history:
2020-03-29 v1.0.0 First release to GitHub.
2020-06-18 v1.1.0 Implemented support for data logging.
Aenderungen:
Hardware:
- HeaterLED durch gelbe LED ersetzt
Software:
- timer1 ISR, da analogWrite auf den Pins 5 und 6 denselben Timer (Iimer0) wie millis() und delay() verwendet
- Watchdog implementiert (1sec) im Loop
- digitalWrite duch Bitbanging ersetzt
- blinkende LEDs in der Startphase bei Fehlern (noPower (gruen, noSensor(gelb), sonstiger Fehler (gruen/gelb)
- endless loop, if sensor is removed while preheating -->see line 677ff and 711ff
https://www.arduino.cc/en/Tutorial/SecretsOfArduinoPWM
Timer output Ard Uno output Chip pin Pin name
OC0A 6 12 PD6
OC0B 5 11 PD5
OC1A 9 15 PB1
OC1B 10 16 PB2
OC2A 11 17 PB3
OC2B 3 5 PD3
// digitalWrite (_PD7, LOW);
PORTD = PORTD & B01111111;
//digitalWrite(_PD7, HIGH);
PORTD = PORTD | B10000000;
// digitalWrite (_PD6, LOW);
PORTD = PORTD & B10111111;
//digitalWrite(_PD6, HIGH);
PORTD = PORTD | B01000000;
Pin Descrition
VM Virtual ground of pump current control and of the LSU (0.5VCC)
US Nernst cell reference voltage (450mV)
IP Inverting input of pump current amplifier (shunt voltage)
IA Non inverting input of pump current amplifier and output of the pump current control
RF Output of pump current amplifier (-> external filter)
CF Input of lambda output amplifier (after external filter)
UA Output of lambda output amplifier
UP Non inverting input of pump current control
UN Inverting input of pump current control respective in-/output for Ri-measurement (LSU)
RM Output Ri-measurement current (DC)
CM Input Ri-measurement current (AC, DC free)
RS In-/output Ri-calibration measurement
UR Output Ri-signal (analogous)
DIAHG Diagnosis input (gate of external transistor)
DIAHD Diagnosis input (drain of external transistor)
SCK Input SPI-clock (from µC)
SI Input serial data (SPI, from µC)
SO Output serial data (SPI, to µC)
/SS Slave select (SPI, from µC)
/RST Input Reset
OSZ R extern = 10k Ω
DIAG_REG - CJ125 Diagnostic Register Definition (Read Only)
00000000
||||||||---- Sensor VM Diagnostic Bit 0
|||||||----- Sensor VM Diagnostic Bit 1
||||||------ Sensor UN Diagnostic Bit 0
|||||------- Sensor UN Diagnostic Bit 1
||||-------- Sensor IA/IP Diagnostic Bit 0
|||--------- Sensor IA/IP Diagnostic Bit 1
00 = Short circuit to ground
01 = Low Battery
10 = Short circuit to Vbatt
11 = No Failure
||---------- Ext. Heater DIAHD Diagnostic Bit
|----------- Ext. Heater DIAHG Diagnostic Bit
00 = Short circuit to ground
01 = Open Load
10 = Short circuit to Vbatt
11 = No Failure
*/
/*************************************************/
//Define included headers.
/*************************************************/
#include <SPI.h>
#include <SD.h>
#include <avr/wdt.h> //Watchdog Lib
/*************************************************/
//Define CJ125 registers used.
/*************************************************/
#define CJ125_IDENT_REG_REQUEST 0x4800 /* Identify request, gives revision of the chip. (not used)*/
#define CJ125_DIAG_REG_REQUEST 0x7800 /* Dignostic request, gives the current status. */
#define CJ125_INIT_REG1_REQUEST 0x6C00 /* Requests the first init register. (not used)*/
#define CJ125_INIT_REG2_REQUEST 0x7E00 /* Requests the second init register. (not used)*/
#define CJ125_INIT_REG1_MODE_CALIBRATE 0x569D /* Sets the first init register in calibration mode. */
#define CJ125_INIT_REG1_MODE_NORMAL_V8 0x5688 /* Sets the first init register in operation mode. V=8 amplification. */
#define CJ125_INIT_REG1_MODE_NORMAL_V17 0x5689 /* Sets the first init register in operation mode. V=17 amplification. */
#define CJ125_DIAG_REG_STATUS_OK 0x28FF /* The response of the diagnostic register when everything is ok. */
#define CJ125_DIAG_REG_STATUS_NOPOWER 0x2855 /* The response of the diagnostic register when power is low. */
#define CJ125_DIAG_REG_STATUS_NOSENSOR 0x287F /* The response of the diagnostic register when no sensor is connected. */
#define CJ125_INIT_REG1_STATUS_0 0x2888 /* The response of the init register when V=8 amplification is in use. */
#define CJ125_INIT_REG1_STATUS_1 0x2889 /* The response of the init register when V=17 amplification is in use. */
/*************************************************/
//Define pin assignments.
/*************************************************/
#define CJ125_NSS_PIN 10 /* Pin used for chip select in SPI communication. */
#define LED_STATUS_POWER 7 /* Pin used for power the status LED, indicating we have power. -->PD7*/
#define LED_STATUS_HEATER 6 /* Pin used for the heater status LED, indicating heater activity.-->PD6 */
#define HEATER_OUTPUT_PIN 5 /* Pin used for the PWM output to the heater circuit. */
#define ANALOG_OUTPUT_PIN 3 /* Pin used for the PWM to the 0-1V analog output. */
#define UB_ANALOG_INPUT_PIN A2 /* Analog input for power supply.*/
#define UR_ANALOG_INPUT_PIN A1 /* Analog input for temperature.*/
#define UA_ANALOG_INPUT_PIN A0 /* Analog input for lambda.*/
/*************************************************/
//Define adjustable parameters.
/*************************************************/
#define SERIAL_RATE 1 /* Serial refresh rate in HZ (1-100)*/
#define UBAT_MIN 150 /* Minimum voltage (ADC value) on Ubat to operate 8,06V--> 150 = 8,06*10kR/(100kR+10kR*1023/5 */
/*************************************************/
//Global variables.
/*************************************************/
int adcValue_UA = 0; /* ADC value read from the CJ125 UA output pin */
int adcValue_UR = 0; /* ADC value read from the CJ125 UR output pin */
int adcValue_UB = 0; /* ADC value read from the voltage divider caluclating Ubat */
int adcValue_UA_Optimal = 0; /* UA ADC value stored when CJ125 is in calibration mode, λ=1 */
int adcValue_UR_Optimal = 0; /* UR ADC value stored when CJ125 is in calibration mode, optimal temperature */
int HeaterOutput = 0; /* Current PWM output value (0-255) of the heater output pin */
int serial_counter = 0; /* Counter used to calculate refresh rate on the serial output */
int CJ125_Status = 0; /* Latest stored DIAG registry response from the CJ125 */
bool logEnabled = false; /* Variable used for setting data logging enable or disabled. */
volatile byte timer1_counter = 0;
/*************************************************/
//PID regulation variables.
/*************************************************/
int dState; /* Last position input. */
int iState; /* Integrator state. */
const int iMax = 250; /* Maximum allowable integrator state. */
const int iMin = -250; /* Minimum allowable integrator state. */
const float pGain = 120; /* Proportional gain. Default = 120*/
const float iGain = 0.8; /* Integral gain. Default = 0.8*/
const float dGain = 10; /* Derivative gain. Default = 10*/
/*************************************************/
//Lambda Conversion Lookup Table. (ADC 39-791).
/*************************************************/
const PROGMEM float Lambda_Conversion[753]
{
0.750, 0.751, 0.752, 0.752, 0.753, 0.754, 0.755, 0.755, 0.756, 0.757, 0.758, 0.758, 0.759, 0.760, 0.761, 0.761, 0.762, 0.763, 0.764, 0.764,
0.765, 0.766, 0.766, 0.767, 0.768, 0.769, 0.769, 0.770, 0.771, 0.772, 0.772, 0.773, 0.774, 0.774, 0.775, 0.776, 0.777, 0.777, 0.778, 0.779,
0.780, 0.780, 0.781, 0.782, 0.782, 0.783, 0.784, 0.785, 0.785, 0.786, 0.787, 0.787, 0.788, 0.789, 0.790, 0.790, 0.791, 0.792, 0.793, 0.793,
0.794, 0.795, 0.796, 0.796, 0.797, 0.798, 0.799, 0.799, 0.800, 0.801, 0.802, 0.802, 0.803, 0.804, 0.805, 0.805, 0.806, 0.807, 0.808, 0.808,
0.809, 0.810, 0.811, 0.811, 0.812, 0.813, 0.814, 0.815, 0.815, 0.816, 0.817, 0.818, 0.819, 0.820, 0.820, 0.821, 0.822, 0.823, 0.824, 0.825,
0.825, 0.826, 0.827, 0.828, 0.829, 0.830, 0.830, 0.831, 0.832, 0.833, 0.834, 0.835, 0.836, 0.837, 0.837, 0.838, 0.839, 0.840, 0.841, 0.842,
0.843, 0.844, 0.845, 0.846, 0.846, 0.847, 0.848, 0.849, 0.850, 0.851, 0.852, 0.853, 0.854, 0.855, 0.855, 0.856, 0.857, 0.858, 0.859, 0.860,
0.861, 0.862, 0.863, 0.864, 0.865, 0.865, 0.866, 0.867, 0.868, 0.869, 0.870, 0.871, 0.872, 0.873, 0.874, 0.875, 0.876, 0.877, 0.878, 0.878,
0.879, 0.880, 0.881, 0.882, 0.883, 0.884, 0.885, 0.886, 0.887, 0.888, 0.889, 0.890, 0.891, 0.892, 0.893, 0.894, 0.895, 0.896, 0.897, 0.898,
0.899, 0.900, 0.901, 0.902, 0.903, 0.904, 0.905, 0.906, 0.907, 0.908, 0.909, 0.910, 0.911, 0.912, 0.913, 0.915, 0.916, 0.917, 0.918, 0.919,
0.920, 0.921, 0.922, 0.923, 0.924, 0.925, 0.926, 0.927, 0.928, 0.929, 0.931, 0.932, 0.933, 0.934, 0.935, 0.936, 0.937, 0.938, 0.939, 0.940,
0.941, 0.942, 0.944, 0.945, 0.946, 0.947, 0.948, 0.949, 0.950, 0.951, 0.952, 0.953, 0.954, 0.955, 0.957, 0.958, 0.959, 0.960, 0.961, 0.962,
0.963, 0.965, 0.966, 0.967, 0.969, 0.970, 0.971, 0.973, 0.974, 0.976, 0.977, 0.979, 0.980, 0.982, 0.983, 0.985, 0.986, 0.987, 0.989, 0.990,
0.991, 0.992, 0.994, 0.995, 0.996, 0.998, 0.999, 1.001, 1.003, 1.005, 1.008, 1.010, 1.012, 1.015, 1.017, 1.019, 1.022, 1.024, 1.026, 1.028,
1.030, 1.032, 1.035, 1.037, 1.039, 1.041, 1.043, 1.045, 1.048, 1.050, 1.052, 1.055, 1.057, 1.060, 1.062, 1.064, 1.067, 1.069, 1.072, 1.075,
1.077, 1.080, 1.082, 1.085, 1.087, 1.090, 1.092, 1.095, 1.098, 1.100, 1.102, 1.105, 1.107, 1.110, 1.112, 1.115, 1.117, 1.120, 1.122, 1.124,
1.127, 1.129, 1.132, 1.135, 1.137, 1.140, 1.142, 1.145, 1.148, 1.151, 1.153, 1.156, 1.159, 1.162, 1.165, 1.167, 1.170, 1.173, 1.176, 1.179,
1.182, 1.185, 1.188, 1.191, 1.194, 1.197, 1.200, 1.203, 1.206, 1.209, 1.212, 1.215, 1.218, 1.221, 1.224, 1.227, 1.230, 1.234, 1.237, 1.240,
1.243, 1.246, 1.250, 1.253, 1.256, 1.259, 1.262, 1.266, 1.269, 1.272, 1.276, 1.279, 1.282, 1.286, 1.289, 1.292, 1.296, 1.299, 1.303, 1.306,
1.310, 1.313, 1.317, 1.320, 1.324, 1.327, 1.331, 1.334, 1.338, 1.342, 1.345, 1.349, 1.352, 1.356, 1.360, 1.364, 1.367, 1.371, 1.375, 1.379,
1.382, 1.386, 1.390, 1.394, 1.398, 1.401, 1.405, 1.409, 1.413, 1.417, 1.421, 1.425, 1.429, 1.433, 1.437, 1.441, 1.445, 1.449, 1.453, 1.457,
1.462, 1.466, 1.470, 1.474, 1.478, 1.483, 1.487, 1.491, 1.495, 1.500, 1.504, 1.508, 1.513, 1.517, 1.522, 1.526, 1.531, 1.535, 1.540, 1.544,
1.549, 1.554, 1.558, 1.563, 1.568, 1.572, 1.577, 1.582, 1.587, 1.592, 1.597, 1.601, 1.606, 1.611, 1.616, 1.621, 1.627, 1.632, 1.637, 1.642,
1.647, 1.652, 1.658, 1.663, 1.668, 1.674, 1.679, 1.684, 1.690, 1.695, 1.701, 1.707, 1.712, 1.718, 1.724, 1.729, 1.735, 1.741, 1.747, 1.753,
1.759, 1.764, 1.770, 1.776, 1.783, 1.789, 1.795, 1.801, 1.807, 1.813, 1.820, 1.826, 1.832, 1.839, 1.845, 1.852, 1.858, 1.865, 1.872, 1.878,
1.885, 1.892, 1.898, 1.905, 1.912, 1.919, 1.926, 1.933, 1.940, 1.947, 1.954, 1.961, 1.968, 1.975, 1.983, 1.990, 1.997, 2.005, 2.012, 2.020,
2.027, 2.035, 2.042, 2.050, 2.058, 2.065, 2.073, 2.081, 2.089, 2.097, 2.105, 2.113, 2.121, 2.129, 2.137, 2.145, 2.154, 2.162, 2.171, 2.179,
2.188, 2.196, 2.205, 2.214, 2.222, 2.231, 2.240, 2.249, 2.258, 2.268, 2.277, 2.286, 2.295, 2.305, 2.314, 2.324, 2.333, 2.343, 2.353, 2.363,
2.373, 2.383, 2.393, 2.403, 2.413, 2.424, 2.434, 2.444, 2.455, 2.466, 2.476, 2.487, 2.498, 2.509, 2.520, 2.532, 2.543, 2.554, 2.566, 2.577,
2.589, 2.601, 2.613, 2.625, 2.637, 2.649, 2.662, 2.674, 2.687, 2.699, 2.712, 2.725, 2.738, 2.751, 2.764, 2.778, 2.791, 2.805, 2.819, 2.833,
2.847, 2.861, 2.875, 2.890, 2.904, 2.919, 2.934, 2.949, 2.964, 2.979, 2.995, 3.010, 3.026, 3.042, 3.058, 3.074, 3.091, 3.107, 3.124, 3.141,
3.158, 3.175, 3.192, 3.209, 3.227, 3.245, 3.263, 3.281, 3.299, 3.318, 3.337, 3.355, 3.374, 3.394, 3.413, 3.433, 3.452, 3.472, 3.492, 3.513,
3.533, 3.554, 3.575, 3.597, 3.618, 3.640, 3.662, 3.684, 3.707, 3.730, 3.753, 3.776, 3.800, 3.824, 3.849, 3.873, 3.898, 3.924, 3.950, 3.976,
4.002, 4.029, 4.056, 4.084, 4.112, 4.140, 4.169, 4.198, 4.228, 4.258, 4.288, 4.319, 4.350, 4.382, 4.414, 4.447, 4.480, 4.514, 4.548, 4.583,
4.618, 4.654, 4.690, 4.726, 4.764, 4.801, 4.840, 4.879, 4.918, 4.958, 4.999, 5.040, 5.082, 5.124, 5.167, 5.211, 5.255, 5.299, 5.345, 5.391,
5.438, 5.485, 5.533, 5.582, 5.632, 5.683 ,5.735, 5.788, 5.841, 5.896, 5.953, 6.010, 6.069, 6.129, 6.190, 6.253, 6.318, 6.384, 6.452, 6.521,
6.592, 6.665, 6.740, 6.817, 6.896, 6.976, 7.059, 7.144, 7.231, 7.320, 7.412, 7.506, 7.602, 7.701, 7.803, 7.906, 8.013, 8.122, 8.234, 8.349,
8.466, 8.587, 8.710, 8.837, 8.966, 9.099, 9.235, 9.374, 9.516, 9.662, 9.811, 9.963, 10.119
};
/*************************************************/
//Oxygen Conversion Lookup Table. (ADC 307-854).
/*************************************************/
const PROGMEM float Oxygen_Conversion[548] {
00.00, 00.04, 00.08, 00.13, 00.17, 00.21, 00.25, 00.30, 00.34, 00.38, 00.42, 00.47, 00.51, 00.55, 00.59, 00.64, 00.68, 00.72, 00.76, 00.81,
00.85, 00.89, 00.93, 00.98, 01.02, 01.06, 01.10, 01.15, 01.19, 01.23, 01.27, 01.31, 01.36, 01.40, 01.44, 01.48, 01.53, 01.57, 01.61, 01.65,
01.70, 01.74, 01.78, 01.82, 01.86, 01.91, 01.95, 01.99, 02.03, 02.08, 02.12, 02.16, 02.20, 02.24, 02.29, 02.33, 02.37, 02.41, 02.45, 02.50,
02.54, 02.58, 02.62, 02.66, 02.71, 02.75, 02.79, 02.83, 02.87, 02.92, 02.96, 03.00, 03.04, 03.08, 03.13, 03.17, 03.21, 03.25, 03.29, 03.33,
03.38, 03.42, 03.46, 03.50, 03.54, 03.58, 03.63, 03.67, 03.71, 03.75, 03.79, 03.83, 03.88, 03.92, 03.96, 04.00, 04.04, 04.08, 04.12, 04.17,
04.21, 04.25, 04.29, 04.33, 04.37, 04.41, 04.45, 04.50, 04.54, 04.58, 04.62, 04.66, 04.70, 04.74, 04.78, 04.82, 04.86, 04.91, 04.95, 04.99,
05.03, 05.07, 05.11, 05.15, 05.19, 05.23, 05.27, 05.31, 05.35, 05.39, 05.44, 05.48, 05.52, 05.56, 05.60, 05.64, 05.68, 05.72, 05.76, 05.80,
05.84, 05.88, 05.92, 05.96, 06.00, 06.04, 06.08, 06.12, 06.16, 06.20, 06.24, 06.28, 06.32, 06.36, 06.40, 06.44, 06.48, 06.52, 06.56, 06.60,
06.64, 06.68, 06.72, 06.76, 06.80, 06.84, 06.88, 06.92, 06.96, 07.00, 07.03, 07.07, 07.11, 07.15, 07.19, 07.23, 07.27, 07.31, 07.35, 07.39,
07.43, 07.47, 07.51, 07.55, 07.59, 07.62, 07.66, 07.70, 07.74, 07.78, 07.82, 07.86, 07.90, 07.94, 07.98, 08.02, 08.06, 08.09, 08.13, 08.17,
08.21, 08.25, 08.29, 08.33, 08.37, 08.41, 08.45, 08.49, 08.52, 08.56, 08.60, 08.64, 08.68, 08.72, 08.76, 08.80, 08.84, 08.88, 08.91, 08.95,
08.99, 09.03, 09.07, 09.11, 09.15, 09.19, 09.23, 09.26, 09.30, 09.34, 09.38, 09.42, 09.46, 09.50, 09.54, 09.57, 09.61, 09.65, 09.69, 09.73,
09.77, 09.81, 09.85, 09.89, 09.92, 09.96, 10.00, 10.04, 10.08, 10.12, 10.16, 10.19, 10.23, 10.27, 10.31, 10.35, 10.39, 10.43, 10.47, 10.50,
10.54, 10.58, 10.62, 10.66, 10.70, 10.73, 10.77, 10.81, 10.85, 10.89, 10.93, 10.97, 11.00, 11.04, 11.08, 11.12, 11.16, 11.20, 11.23, 11.27,
11.31, 11.35, 11.39, 11.43, 11.46, 11.50, 11.54, 11.58, 11.62, 11.66, 11.69, 11.73, 11.77, 11.81, 11.85, 11.89, 11.92, 11.96, 12.00, 12.04,
12.08, 12.11, 12.15, 12.19, 12.23, 12.27, 12.30, 12.34, 12.38, 12.42, 12.46, 12.49, 12.53, 12.57, 12.61, 12.65, 12.68, 12.72, 12.76, 12.80,
12.84, 12.87, 12.91, 12.95, 12.99, 13.03, 13.06, 13.10, 13.14, 13.18, 13.21, 13.25, 13.29, 13.33, 13.36, 13.40, 13.44, 13.48, 13.51, 13.55,
13.59, 13.63, 13.67, 13.70, 13.74, 13.78, 13.82, 13.85, 13.89, 13.93, 13.96, 14.00, 14.04, 14.08, 14.11, 14.15, 14.19, 14.23, 14.26, 14.30,
14.34, 14.38, 14.41, 14.45, 14.49, 14.52, 14.56, 14.60, 14.64, 14.67, 14.71, 14.75, 14.78, 14.82, 14.86, 14.90, 14.93, 14.97, 15.01, 15.04,
15.08, 15.12, 15.15, 15.19, 15.23, 15.26, 15.30, 15.34, 15.37, 15.41, 15.45, 15.48, 15.52, 15.56, 15.59, 15.63, 15.67, 15.70, 15.74, 15.78,
15.81, 15.85, 15.89, 15.92, 15.96, 16.00, 16.03, 16.07, 16.11, 16.14, 16.18, 16.22, 16.25, 16.29, 16.32, 16.36, 16.40, 16.43, 16.47, 16.51,
16.54, 16.58, 16.61, 16.65, 16.69, 16.72, 16.76, 16.79, 16.83, 16.87, 16.90, 16.94, 16.97, 17.01, 17.05, 17.08, 17.12, 17.15, 17.19, 17.22,
17.26, 17.30, 17.33, 17.37, 17.40, 17.44, 17.47, 17.51, 17.55, 17.58, 17.62, 17.65, 17.69, 17.72, 17.76, 17.79, 17.83, 17.86, 17.90, 17.94,
17.97, 18.01, 18.04, 18.08, 18.11, 18.15, 18.18, 18.22, 18.25, 18.29, 18.32, 18.36, 18.39, 18.43, 18.46, 18.50, 18.53, 18.57, 18.60, 18.64,
18.67, 18.71, 18.74, 18.78, 18.81, 18.85, 18.88, 18.92, 18.95, 18.98, 19.02, 19.05, 19.09, 19.12, 19.16, 19.19, 19.23, 19.26, 19.30, 19.33,
19.36, 19.40, 19.43, 19.47, 19.50, 19.54, 19.57, 19.60, 19.64, 19.67, 19.71, 19.74, 19.77, 19.81, 19.84, 19.88, 19.91, 19.94, 19.98, 20.01,
20.05, 20.08, 20.11, 20.15, 20.18, 20.22, 20.25, 20.28, 20.32, 20.35, 20.38, 20.42, 20.45, 20.48, 20.52, 20.55, 20.58, 20.62, 20.65, 20.68,
20.72, 20.75, 20.78, 20.82, 20.85, 20.88, 20.92, 20.95
};
/*************************************************/
//ISR Timer 1
//wird benutzt statt delay()
/*************************************************/
ISR(TIMER1_COMPA_vect)
{
timer1_counter = timer1_counter+1;
}
/*************************************************/
//Function for transfering SPI data to the CJ125.
/*************************************************/
uint16_t COM_SPI(uint16_t TX_data)
{
//Configure SPI for CJ125 controller.
SPI.setDataMode(SPI_MODE1);
SPI.setClockDivider(SPI_CLOCK_DIV128);
//Set chip select pin low, chip in use.
digitalWrite(CJ125_NSS_PIN, LOW);
//Transmit request.
uint16_t Response = SPI.transfer16(TX_data);
//Set chip select pin high, chip not in use.
digitalWrite(CJ125_NSS_PIN, HIGH);
return Response;
}
/*************************************************/
//Temperature regulating software (PID).
/*************************************************/
int Heater_PID_Control(int input)
{
//Calculate error term.
int error = adcValue_UR_Optimal - input;
//Set current position.
int position = input;
//Calculate proportional term.
float pTerm = -pGain * error; //pGain=120 iGain= 0.8; dGain = 10;
//Calculate the integral state with appropriate limiting.
iState += error;
if (iState > iMax) //iMax=250
{
iState = iMax;
}
if (iState < iMin) //iMin=-250
{
iState = iMin;
}
//Calculate the integral term.
float iTerm = -iGain * iState;
//Calculate the derivative term.
float dTerm = -dGain * (dState - position);
dState = position;
//Calculate regulation (PI).
int RegulationOutput = pTerm + iTerm + dTerm;
//Set maximum heater output (full power).
if (RegulationOutput > 255)
{
RegulationOutput = 255;
}
//Set minimum heater value (cooling).
if (RegulationOutput < 0.0)
{
RegulationOutput = 0;
}
//Return calculated PWM output.
return RegulationOutput;
}
/*************************************************/
//Displays the AFR value on an external narrowband lambda gauge with an (RC-filtered)
//0-1V PWM signal from ANALOG_OUTPUT_PIN. 0V = AFR 20.00. 1V = AFR 10.00.
/*************************************************/
void UpdateAnalogOutput()
{
//Local constants.
const float AirFuelRatioOctane = 14.70;
const int maximumOutput = 51; /* 1V */
const int minimumOutput = 0; /* 0V */
//Local variables.
int analogOutput = 0;
float lambdaAFR = Lookup_Lambda(adcValue_UA) * AirFuelRatioOctane;
//Convert lambda value to PWM output.
analogOutput = map(lambdaAFR * 100, 2000, 1000, minimumOutput, maximumOutput);
//Make sure we do not exceed maximum values.
if (analogOutput > maximumOutput)
{
analogOutput = maximumOutput;
}
if (analogOutput < minimumOutput)
{
analogOutput = minimumOutput;
}
//Set PWM output.
analogWrite(ANALOG_OUTPUT_PIN, analogOutput); /*Output for AFR Display 0-1V */
}
/*************************************************/
//Lookup Lambda Value.
/*************************************************/
float Lookup_Lambda(int Input_ADC)
{
//Declare and set default return value.
float LAMBDA_VALUE = 0;
//Validate ADC range for lookup table.
if (Input_ADC >= 39 && Input_ADC <= 791)
{
LAMBDA_VALUE = pgm_read_float_near(Lambda_Conversion + (Input_ADC-39));
}
if (Input_ADC > 791) {
LAMBDA_VALUE = 10.119;
}
if (Input_ADC < 39) {
LAMBDA_VALUE = 0.750;
}
//Return value.
return LAMBDA_VALUE;
}
/*************************************************/
//Lookup Oxygen Content.
/*************************************************/
float Lookup_Oxygen(int Input_ADC)
{
//Declare and set default return value.
float OXYGEN_CONTENT = 0;
//Validate ADC range for lookup table.
if (Input_ADC > 854)
{
Input_ADC = 854;
}
if (Input_ADC >= 307 && Input_ADC <= 854)
{
OXYGEN_CONTENT = pgm_read_float_near(Oxygen_Conversion + (Input_ADC - 307));
}
//Return value.
return OXYGEN_CONTENT;
}
/*************************************************/
//Data logging function.
/*************************************************/
void logData(String logString)
{
//Connect to SD-Card.
if ( SD.begin() )
{
//Open file.
File logFile = SD.open("log.txt", FILE_WRITE);
//Store data.
logFile.println(logString);
//Close file.
logFile.close();
//Flush SPI, required when switching between modes.
COM_SPI(0x00);
}
else
{
//Error handling.
Serial.println("Error accessing SD-card.");
}
}
/*************************************************/
//Function to set up device for operation.
/*************************************************/
void setup() {
cli();
//set timer1 interrupt
TCCR1A = 0;// set entire TCCR1A register to 0
TCCR1B = 0;// same for TCCR1B
TCNT1 = 0;//initialize counter value to 0
// turn on CTC mode
TCCR1B |= (1 << WGM12);
// Set CS10 and CS11 bits for 64 prescaler
TCCR1B |= (0 << CS12) | (1 << CS11) | (1 << CS10);
// stop timer compare interrupt
TIMSK1 |= (0 << OCIE1A);
sei();
//Set up serial communication.
Serial.begin(38400);
//Set up SPI.
SPI.begin(); /* Note, SPI will disable the bult in LED. */
SPI.setBitOrder(MSBFIRST);
//Configure SPI for CJ125 controller.
SPI.setDataMode(SPI_MODE1);
SPI.setClockDivider(SPI_CLOCK_DIV128);
//Set up digital output pins.
pinMode(CJ125_NSS_PIN, OUTPUT);
pinMode(LED_STATUS_POWER, OUTPUT);
pinMode(LED_STATUS_HEATER, OUTPUT);
pinMode(HEATER_OUTPUT_PIN, OUTPUT);
//Set initial values.
digitalWrite(CJ125_NSS_PIN, HIGH);
//digitalWrite(LED_STATUS_POWER, LOW);
PORTD = PORTD & B01111111;
//digitalWrite(LED_STATUS_HEATER, LOW);
PORTD = PORTD & B10111111;
analogWrite(HEATER_OUTPUT_PIN, 0); /* PWM is initially off. */
analogWrite(ANALOG_OUTPUT_PIN, 0); /* PWM is initially off. */
//Start of operation. (Test LED's).
Serial.print("Device reset.\n\r");
//digitalWrite(LED_STATUS_POWER, HIGH);
PORTD = PORTD | B10000000;
//digitalWrite(LED_STATUS_HEATER, HIGH);
PORTD = PORTD | B01000000;
delay(200);
//digitalWrite(LED_STATUS_POWER, LOW);
PORTD = PORTD & B01111111;
//digitalWrite(LED_STATUS_HEATER, LOW);
PORTD = PORTD & B10111111;
//Configure data logging.
if ( SD.begin() )
{
//Enable data logging.
Serial.println("Data logging enabled.");
logEnabled = true;
//Flush SPI, required when switching between modes.
COM_SPI(0x00);
}
//Start main function.
start();
}
/*************************************************/
//Startup
/*************************************************/
void start()
{
OCR1A = 62499; //set Timer1 CTC at to 62499
/*set AFR Gauge to 14,3*/
byte x=26;
analogWrite(ANALOG_OUTPUT_PIN, x);
//Wait until everything is ready.
while (adcValue_UB < UBAT_MIN || CJ125_Status != CJ125_DIAG_REG_STATUS_OK) // <8,06V
{
//Read CJ125 diagnostic register from SPI.
CJ125_Status = COM_SPI(CJ125_DIAG_REG_REQUEST);
//Read input voltage.
adcValue_UB = analogRead(UB_ANALOG_INPUT_PIN);
//Error handling.
TIMSK1 |= (1 << OCIE1A); //enable Timer1 Interrupt
if(adcValue_UB < UBAT_MIN | CJ125_Status == CJ125_DIAG_REG_STATUS_NOPOWER)
{
//LED blinkt gruen
Serial.println("Stromversorgung unter 8V");
Serial.print("Error, CJ125: 0x");
Serial.println(CJ125_Status, HEX);
//digitalWrite(LED_STATUS_HEATER, LOW);
PORTD = PORTD & B10111111;
while (timer1_counter<1);
//digitalWrite(LED_STATUS_POWER, LOW);
PORTD = PORTD & B01111111;
timer1_counter=0;
while (timer1_counter<1);
//digitalWrite(LED_STATUS_POWER, HIGH);
PORTD = PORTD | B10000000;
timer1_counter=0;
while (timer1_counter<1);
//digitalWrite(LED_STATUS_POWER, LOW);
PORTD = PORTD & B01111111;
timer1_counter=0;
while (timer1_counter<1);
//digitalWrite(LED_STATUS_POWER, HIGH);
PORTD = PORTD | B10000000;
timer1_counter=0;
}
else if (CJ125_Status == CJ125_DIAG_REG_STATUS_NOSENSOR)
{
Serial.println("kein Sensor");
Serial.print("Error, CJ125: 0x");
Serial.println(CJ125_Status, HEX);
//digitalWrite(LED_STATUS_POWER, LOW);
PORTD = PORTD & B01111111;
//delay(1000);
while (timer1_counter<1);
//digitalWrite(LED_STATUS_HEATER, HIGH);
PORTD = PORTD | B01000000;
timer1_counter=0;
while (timer1_counter<1);
//digitalWrite(LED_STATUS_HEATER, LOW);
PORTD = PORTD & B10111111;
timer1_counter=0;
while (timer1_counter<1);
//digitalWrite(LED_STATUS_HEATER, HIGH);
PORTD = PORTD | B01000000;
timer1_counter=0;
while (timer1_counter<1);
//digitalWrite(LED_STATUS_HEATER, LOW);
PORTD = PORTD & B10111111;
timer1_counter=0;
}
else if (CJ125_Status != CJ125_DIAG_REG_STATUS_OK)
{
Serial.print("Error, CJ125: 0x");
Serial.println(CJ125_Status, HEX);
//Serial.print("\n\r");
while (timer1_counter<1);
//digitalWrite(LED_STATUS_POWER, LOW);
PORTD = PORTD & B01111111;
//digitalWrite(LED_STATUS_HEATER, HIGH);
PORTD = PORTD | B01000000;
timer1_counter=0;
while (timer1_counter<1);
//digitalWrite(LED_STATUS_POWER, HIGH);
PORTD = PORTD | B10000000;
//digitalWrite(LED_STATUS_HEATER, LOW);
PORTD = PORTD & B10111111;
timer1_counter=0;
while (timer1_counter<1);
//digitalWrite(LED_STATUS_POWER, LOW);
PORTD = PORTD & B01111111;
//digitalWrite(LED_STATUS_HEATER, HIGH);
PORTD = PORTD | B01000000;
timer1_counter=0;
while (timer1_counter<1);
//digitalWrite(LED_STATUS_POWER, HIGH);
PORTD = PORTD | B10000000;
//digitalWrite(LED_STATUS_HEATER, LOW);
PORTD = PORTD & B10111111;
timer1_counter=0;
}
TIMSK1 |= (0 << OCIE1A);
//digitalWrite(LED_STATUS_HEATER, LOW);
PORTD = PORTD & B10111111;
//digitalWrite(LED_STATUS_POWER, LOW);
PORTD = PORTD & B01111111;
}
//Start of operation. (Start Power LED).
Serial.print("Device ready.\n\r");
//digitalWrite(LED_STATUS_POWER, HIGH);
PORTD = PORTD | B10000000;
//Store calibrated optimum values.
Serial.print("Reading calibration data.\n\r");
//Set CJ125 in calibration mode.
COM_SPI(CJ125_INIT_REG1_MODE_CALIBRATE);
//Let values settle.
//delay(500);
TIMSK1 |= (1 << OCIE1A);
while (timer1_counter<2); //2*0,25sec=0,5sec
timer1_counter=0;
TIMSK1 |= (0 << OCIE1A);
//Store optimal values before leaving calibration mode.
adcValue_UA_Optimal = analogRead(UA_ANALOG_INPUT_PIN);
adcValue_UR_Optimal = analogRead(UR_ANALOG_INPUT_PIN);
//Update analog output, display the optimal value.
adcValue_UA = adcValue_UA_Optimal;
UpdateAnalogOutput();
//Set CJ125 in normal operation mode.
//COM_SPI(CJ125_INIT_REG1_MODE_NORMAL_V8); /* V=0 */
COM_SPI(CJ125_INIT_REG1_MODE_NORMAL_V17); /* V=1 */
//Present calibration data:
Serial.print("UA_Optimal (λ = 1.00): ");
Serial.print(adcValue_UA_Optimal);
Serial.print(" (λ = ");
Serial.print(Lookup_Lambda(adcValue_UA_Optimal), 2);
Serial.print(")\n\r");
Serial.print("UR_Optimal: ");
Serial.print(adcValue_UR_Optimal);
Serial.print("\n\r");
/*************************************************/
/* Heat up sensor. This is described in detail in the datasheet of the LSU 4.9 sensor with a
condensation phase and a ramp up face before going in to PID control. */
/*************************************************/
Serial.print("Heating sensor.\n\r");
//Calculate supply voltage.
float SupplyVoltage = (((float)adcValue_UB / 1023 * 5) / 10000) * 110000;
//Condensation phase, 2V for 5s.
int CondensationPWM = (2 / SupplyVoltage) * 255;
analogWrite(HEATER_OUTPUT_PIN, CondensationPWM); //Output at Pin 5
byte t = 0;
while (t < 5 && analogRead(UB_ANALOG_INPUT_PIN) > UBAT_MIN)
{
//Flash Heater LED in condensation phase.
//digitalWrite(LED_STATUS_HEATER, HIGH);
PORTD = PORTD | B01000000;
Serial.println("Heater On condensation phase Zeile 657");
//delay(500);
TIMSK1 |= (1 << OCIE1A);
while (timer1_counter<2); //2*0,25sec=0,5sec
timer1_counter=0;
TIMSK1 |= (0 << OCIE1A);
//digitalWrite(LED_STATUS_HEATER, LOW);
PORTD = PORTD & B10111111;
Serial.println("Heater Off Zeile 666");
//delay(500);
TIMSK1 |= (1 << OCIE1A);
while (timer1_counter<2); //2*0,25sec=0,5sec
timer1_counter=0;
TIMSK1 |= (0 << OCIE1A);
t += 1;
}
//Ramp up phase, +0.4V / s until 100% PWM from 8.5V.
float UHeater = 8.5;
while (UHeater < 13.0 && analogRead(UB_ANALOG_INPUT_PIN) > UBAT_MIN) //endless loop, if sensor removed, while preheating
// while (UHeater < 13.0 && CJ125_Status != CJ125_DIAG_REG_STATUS_OK) --> not tested yet
{
// CJ125_Status = COM_SPI(CJ125_DIAG_REG_REQUEST); //uncomment, when line 677 is uncommented
//Set heater output during ramp up.
CondensationPWM = (UHeater / SupplyVoltage) * 255;
if (CondensationPWM > 255)
{
CondensationPWM = 255; /*If supply voltage is less than 13V, maximum is 100% PWM*/
}
analogWrite(HEATER_OUTPUT_PIN, CondensationPWM);
//Flash Heater LED in condensation phase.
//digitalWrite(LED_STATUS_HEATER, HIGH);
PORTD = PORTD | B01000000;
Serial.println("Heater On condensation phase Zeile 690");
//delay(500);
TIMSK1 |= (1 << OCIE1A);
while (timer1_counter<2); //2*0,25sec=0,5sec
timer1_counter=0;
TIMSK1 |= (0 << OCIE1A);
//digitalWrite(LED_STATUS_HEATER, LOW);
PORTD = PORTD & B10111111;
Serial.println("Heater Off Zeile 699");
//delay(500);
TIMSK1 |= (1 << OCIE1A);
while (timer1_counter<2); //2*0,25sec=0,5sec
timer1_counter=0;
TIMSK1 |= (0 << OCIE1A);
//Increment Voltage.
UHeater += 0.4;
}
//Heat until temperature optimum is reached or exceeded (lower value is warmer).
while (analogRead(UR_ANALOG_INPUT_PIN) > adcValue_UR_Optimal && CJ125_Status != CJ125_DIAG_REG_STATUS_OK)
//while (analogRead(UR_ANALOG_INPUT_PIN) > adcValue_UR_Optimal && analogRead(UB_ANALOG_INPUT_PIN) > UBAT_MIN)
{
//CJ125_Status = COM_SPI(CJ125_DIAG_REG_REQUEST); //uncomment, when line 711 is uncommented
//Flash Heater LED in condensation phase.
//digitalWrite(LED_STATUS_HEATER, HIGH);
PORTD = PORTD | B01000000;
Serial.println("Heater On until temperature optimum is reached Zeile 717");
//delay(500);
TIMSK1 |= (1 << OCIE1A);
while (timer1_counter<2); //2*0,25sec=0,5sec
timer1_counter=0;
TIMSK1 |= (0 << OCIE1A);
//digitalWrite(LED_STATUS_HEATER, LOW);
PORTD = PORTD & B10111111;
Serial.println("Heater Led Off Zeile 726");
//delay(500);
TIMSK1 |= (1 << OCIE1A);
while (timer1_counter<2); //2*0,25sec=0,5sec
timer1_counter=0;
TIMSK1 |= (0 << OCIE1A);
}
//Heating phase finished, hand over to PID-control. Turn on LED and turn off heater.
//digitalWrite(LED_STATUS_HEATER, HIGH);
PORTD = PORTD | B01000000;
Serial.println("Heater Off Heating phase finished Zeile 736");
analogWrite(HEATER_OUTPUT_PIN, 0);
//set overflow to 25009-->0,01sec, this setting is only used in <loop>
OCR1A = 2500;
//enable Watchdog -->1sec
wdt_enable(WDTO_1S);
}
/*************************************************/
//Infinite loop.
/*************************************************/
void loop()
{
//Update CJ125 diagnostic register from SPI.
CJ125_Status = COM_SPI(CJ125_DIAG_REG_REQUEST);
//Update analog inputs.
adcValue_UA = analogRead(UA_ANALOG_INPUT_PIN); //Pin A0
adcValue_UR = analogRead(UR_ANALOG_INPUT_PIN); //Pin A1
adcValue_UB = analogRead(UB_ANALOG_INPUT_PIN); //Pin A2
//Adjust PWM output by calculated PID regulation.
if (adcValue_UR < 500 || adcValue_UR_Optimal != 0 || adcValue_UB > UBAT_MIN)
{
//Calculate and set new heater output.
/*
Minimum frequency of heater voltage control ≥ 20 Hz
recommended value: ≥ 100 Hz
*/
HeaterOutput = Heater_PID_Control(adcValue_UR);
analogWrite(HEATER_OUTPUT_PIN, HeaterOutput);
}
else
{
//Turn off heater if we are not in PID control.
HeaterOutput = 0;
analogWrite(HEATER_OUTPUT_PIN, HeaterOutput);
}
//If power is lost, "reset" the device.
if (adcValue_UB < UBAT_MIN)
{
//Indicate low power.
Serial.print("Low power.\n");
//Turn of status LEDs.
//digitalWrite(LED_STATUS_POWER, LOW);
PORTD = PORTD & B01111111;
//digitalWrite(LED_STATUS_HEATER, LOW);
PORTD = PORTD & B10111111;
//Re-start() and wait for power.
wdt_enable(WDTO_1S);
wdt_disable(); //disable Watchdog
start();
}
//Display on serial port at defined rate. Comma separate values, readable by frontends.
if ((100 / SERIAL_RATE) <= serial_counter)
{
//Reset counter.
serial_counter = 0;
//Calculate Lambda Value.
float LAMBDA_VALUE = Lookup_Lambda(adcValue_UA);
//Calculate Oxygen Content.
float OXYGEN_CONTENT = Lookup_Oxygen(adcValue_UA);
//Update analog output.
UpdateAnalogOutput(); //update AFR Gauge
//Display information if no errors is reported.
if (CJ125_Status == CJ125_DIAG_REG_STATUS_OK)
{
//Assembled data.
String txString = "Measuring, CJ125: 0x";
txString += String(CJ125_Status, HEX);
txString += ", UA_ADC: ";
txString += String(adcValue_UA, DEC);
txString += ", UR_ADC: ";
txString += String(adcValue_UR, DEC);
txString += ", UB_ADC: ";
txString += String(adcValue_UB, DEC);
//Display lambda value unless out of range.
if (adcValue_UA >= 39 && adcValue_UA <= 791)
{
txString += ", Lambda: ";
txString += String(LAMBDA_VALUE, 2);
}
else
{
txString += ", Lambda: -";
}
//Display oxygen unless out of range.
if (adcValue_UA >= 307)
{
txString += ", Oxygen: ";
txString += String(OXYGEN_CONTENT, 2);
txString += "%";
}
else
{
txString += ", Oxygen: -";
}
//Output string
Serial.println(txString);
//Log string.
if (logEnabled == true)
{
logData(txString);
}
}
else
{
//Error handling.
switch(CJ125_Status)
{
case CJ125_DIAG_REG_STATUS_NOPOWER:
Serial.print("Error, CJ125: 0x");
Serial.print(CJ125_Status, HEX);
Serial.print(" (No Power)\n\r");
break;
case CJ125_DIAG_REG_STATUS_NOSENSOR:
Serial.print("Error, CJ125: 0x");
Serial.print(CJ125_Status, HEX);
Serial.print(" (No Sensor)\n\r");
break;
default:
Serial.print("Error, CJ125: 0x");
Serial.print(CJ125_Status, HEX);
Serial.print("\n\r");
}
}
}
//Increment serial output counter and delay for next cycle. The PID requires to be responsive but we don't need to flood the serial port.
serial_counter++;
//Watchdog Reset
wdt_reset();
//delay(10);
TIMSK1 |= (1 << OCIE1A);
while (timer1_counter<1);
timer1_counter=0;
TIMSK1 |= (0 << OCIE1A);
}
Greetz from Laupheim, Germany
wolf