Elct Car Team / Mbed 2 deprecated CarLab

first commit

Dependencies:   mbed MMA8451Q

driving.h@18:831c1e03d83e, 2021-10-26 (annotated)

Committer:
quarren42
Date:
Tue Oct 26 22:56:10 2021 +0000
Revision:
18:831c1e03d83e
Parent:
17:d2c98ebda90b
Child:
21:9e6ddb590103
- Most recent

Who changed what in which revision?

UserRevisionLine numberNew contents of line
quarren42 1:c324a2849500 1 #define TI 0.001f //1kHz sample time
quarren42 1:c324a2849500 2 #define KP_LEFT 0.0379f //Proportional gain
quarren42 1:c324a2849500 3 #define KI_LEFT 0.7369f //Integral Gain
quarren42 1:c324a2849500 4
quarren42 1:c324a2849500 5 //#define KP_LEFT 16.1754f
quarren42 1:c324a2849500 6 //#define KI_LEFT 314.7632f
quarren42 1:c324a2849500 7
quarren42 1:c324a2849500 8 //#define KP_RIGHT 0.0379f
quarren42 1:c324a2849500 9 //#define KI_RIGHT 0.7369f
quarren42 1:c324a2849500 10
quarren42 1:c324a2849500 11 #define KP_RIGHT 0.0463f
quarren42 1:c324a2849500 12 #define KI_RIGHT 0.8981f
quarren42 1:c324a2849500 13
quarren42 18:831c1e03d83e 14 #define freq 25000.0f
quarren42 1:c324a2849500 15
quarren42 1:c324a2849500 16 #define fullBatScalar 0.5873f
quarren42 1:c324a2849500 17 #define speedSensorScalar 2.5f
quarren42 1:c324a2849500 18 #define battDividerScalar 4.0;
quarren42 6:d2bd68ba99c9 19
quarren42 8:cca7647cdb4b 20 AnalogIn pot1(PTB2); //was PTB0
aalawfi 16:8cd4dd323941 21 // Motor Left is PTE20
aalawfi 16:8cd4dd323941 22 // Motor right is pte 21
quarren42 8:cca7647cdb4b 23 PwmOut motorLeft(PTE20); //was PTB1
quarren42 8:cca7647cdb4b 24 PwmOut motorRight(PTE21); //was PTB2
aalawfi 16:8cd4dd323941 25 // left is ptb3
aalawfi 16:8cd4dd323941 26 // right is ptc 2
aalawfi 3:25c6bf0abc00 27 AnalogIn speedSensorLeft(PTB3);
aalawfi 3:25c6bf0abc00 28 AnalogIn speedSensorRight(PTC2);
aalawfi 3:25c6bf0abc00 29 DigitalOut ledRed(LED1);
aalawfi 3:25c6bf0abc00 30 AnalogIn battInput(PTC1);
aalawfi 16:8cd4dd323941 31 // left brake is pta12
aalawfi 16:8cd4dd323941 32 // right brake is pta4
aalawfi 3:25c6bf0abc00 33 DigitalOut brakeLeft(PTA12);
quarren42 8:cca7647cdb4b 34 DigitalOut brakeRight(PTA4); //was PTD4
aalawfi 3:25c6bf0abc00 35
aalawfi 3:25c6bf0abc00 36 float pot1Voltage;
aalawfi 3:25c6bf0abc00 37 float dutyCycleLeft;
aalawfi 3:25c6bf0abc00 38 float tempDutyCycleLeft = 0;
aalawfi 3:25c6bf0abc00 39 float tempDutyCycleRight = 0;
aalawfi 3:25c6bf0abc00 40 float dutyCycleRight;
aalawfi 3:25c6bf0abc00 41 float speedLeftVolt;
aalawfi 3:25c6bf0abc00 42 float speedRightVolt;
aalawfi 3:25c6bf0abc00 43 float batteryVoltage;
aalawfi 3:25c6bf0abc00 44 float avgCellVoltage;
aalawfi 3:25c6bf0abc00 45
aalawfi 3:25c6bf0abc00 46 float errorAreaLeft = 0;
aalawfi 3:25c6bf0abc00 47 float errorAreaRight = 0;
aalawfi 3:25c6bf0abc00 48 float errorAreaLeftPrev = 0;
aalawfi 3:25c6bf0abc00 49 float errorAreaRightPrev = 0;
aalawfi 3:25c6bf0abc00 50 float errorLeft = 0;
aalawfi 3:25c6bf0abc00 51 float errorRight = 0;
aalawfi 3:25c6bf0abc00 52 float setpointLeft = 0.0; //target speed, 0.0 to 1.0
aalawfi 3:25c6bf0abc00 53 float setpointRight = 0.0;
aalawfi 3:25c6bf0abc00 54 float controllerOutputLeft = 0;
aalawfi 3:25c6bf0abc00 55 float controllerOutputRight = 0;
aalawfi 3:25c6bf0abc00 56 float x;
aalawfi 3:25c6bf0abc00 57
aalawfi 3:25c6bf0abc00 58 bool clampLeft = false;
aalawfi 3:25c6bf0abc00 59 bool clampRight = false;
aalawfi 3:25c6bf0abc00 60
aalawfi 3:25c6bf0abc00 61 bool brakeLeftBool = false;
aalawfi 3:25c6bf0abc00 62 bool brakeRightBool = false;
aalawfi 3:25c6bf0abc00 63
aalawfi 13:0091da3021df 64 volatile bool are_brakes_activated; // Used for debugging
aalawfi 11:210a33ee774f 65 void disable_brakes(void){
aalawfi 13:0091da3021df 66 are_brakes_activated = false;
aalawfi 11:210a33ee774f 67 brakeLeft=0;
aalawfi 11:210a33ee774f 68 brakeRight=0;
aalawfi 11:210a33ee774f 69 };
aalawfi 11:210a33ee774f 70 void enable_brakes(void) {
aalawfi 13:0091da3021df 71 are_brakes_activated = true;
aalawfi 11:210a33ee774f 72 brakeLeft = 1;
aalawfi 11:210a33ee774f 73 brakeRight = 1;
quarren42 17:d2c98ebda90b 74 errorAreaRight = 0.0;
quarren42 17:d2c98ebda90b 75 errorAreaLeft = 0.0;
quarren42 17:d2c98ebda90b 76
aalawfi 11:210a33ee774f 77 };
aalawfi 11:210a33ee774f 78
aalawfi 3:25c6bf0abc00 79
aalawfi 10:b0999f69c775 80 /*
aalawfi 10:b0999f69c775 81 Always set duty cycle to zero (disabling the motor), unless the motor is enabled
aalawfi 10:b0999f69c775 82 (motor_enabled = true);
aalawfi 10:b0999f69c775 83 BY default, the motor is disabled (duty cycle is zero)
aalawfi 10:b0999f69c775 84 */
aalawfi 10:b0999f69c775 85
aalawfi 9:5320c2dfb913 86 volatile bool motor_enabled = false;
aalawfi 5:636c3fe18aa8 87 void PI(void) { //motor PI interrupt
quarren42 17:d2c98ebda90b 88
quarren42 17:d2c98ebda90b 89 speedLeftVolt = (speedSensorLeft.read() * 3.3f);
quarren42 17:d2c98ebda90b 90 speedRightVolt = (speedSensorRight.read() * 3.3f);
quarren42 17:d2c98ebda90b 91
aalawfi 10:b0999f69c775 92 if(motor_enabled == true) {
quarren42 17:d2c98ebda90b 93 //setpointLeft = 0.2;
quarren42 17:d2c98ebda90b 94 //setpointRight = 0.2;
aalawfi 10:b0999f69c775 95 //--- Calculate Error ---
aalawfi 10:b0999f69c775 96 errorLeft = setpointLeft - (speedLeftVolt / 3.3f); //error and setpoint is defined as a percentage, from 0 to 1
aalawfi 10:b0999f69c775 97 errorRight = setpointRight - (speedRightVolt / 3.3f);
aalawfi 10:b0999f69c775 98 //--- Steady State Error Tolerace ---
aalawfi 10:b0999f69c775 99 if (abs(errorLeft) < 0.01){
aalawfi 10:b0999f69c775 100 errorLeft = 0.0;
aalawfi 10:b0999f69c775 101 }
aalawfi 10:b0999f69c775 102 if (abs(errorRight) < 0.01){
aalawfi 10:b0999f69c775 103 errorRight = 0.0;
aalawfi 10:b0999f69c775 104 }
aalawfi 10:b0999f69c775 105 //--- Calculate integral error ---
aalawfi 10:b0999f69c775 106 if (clampLeft == false){
aalawfi 5:636c3fe18aa8 107 errorAreaLeft = TI*errorLeft + errorAreaLeftPrev;
aalawfi 10:b0999f69c775 108 }
aalawfi 10:b0999f69c775 109 if (clampRight == false){
aalawfi 10:b0999f69c775 110 errorAreaRight = TI*errorRight + errorAreaRightPrev;
aalawfi 10:b0999f69c775 111 }
aalawfi 10:b0999f69c775 112 errorAreaLeftPrev = errorAreaLeft;
aalawfi 10:b0999f69c775 113 errorAreaRightPrev = errorAreaRight;
aalawfi 5:636c3fe18aa8 114 /*
aalawfi 5:636c3fe18aa8 115 if (errorAreaLeft > 0.1){
aalawfi 5:636c3fe18aa8 116 errorAreaLeft = 0.0;
aalawfi 5:636c3fe18aa8 117 }
aalawfi 5:636c3fe18aa8 118 p
aalawfi 5:636c3fe18aa8 119 if (errorAreaRight > 0.1){
aalawfi 5:636c3fe18aa8 120 errorAreaRight = 0.0;
aalawfi 5:636c3fe18aa8 121 }
aalawfi 5:636c3fe18aa8 122 */
aalawfi 5:636c3fe18aa8 123
aalawfi 5:636c3fe18aa8 124 //--- Calculate total error ---
aalawfi 10:b0999f69c775 125 controllerOutputLeft = KP_LEFT*errorLeft + KI_LEFT*errorAreaLeft;
aalawfi 10:b0999f69c775 126 controllerOutputRight = KP_RIGHT*errorRight + KI_RIGHT*errorAreaRight;
aalawfi 10:b0999f69c775 127 tempDutyCycleLeft = fullBatScalar * controllerOutputLeft;
aalawfi 10:b0999f69c775 128 tempDutyCycleRight = fullBatScalar * controllerOutputRight;
aalawfi 10:b0999f69c775 129 //--- Motor over-voltage safety ---
aalawfi 10:b0999f69c775 130 if (tempDutyCycleLeft > fullBatScalar){ //safety mechanism in case feedback breaks for any reason -
aalawfi 10:b0999f69c775 131 dutyCycleLeft = fullBatScalar; //will stop output from exceeding max duty cycle and damaging motor
aalawfi 10:b0999f69c775 132 } else {
aalawfi 10:b0999f69c775 133 dutyCycleLeft = tempDutyCycleLeft;
aalawfi 5:636c3fe18aa8 134 }
aalawfi 10:b0999f69c775 135 if (tempDutyCycleRight > fullBatScalar){
aalawfi 10:b0999f69c775 136 dutyCycleRight = fullBatScalar;
aalawfi 10:b0999f69c775 137 } else {
aalawfi 10:b0999f69c775 138 dutyCycleRight = tempDutyCycleRight;
aalawfi 10:b0999f69c775 139 }
aalawfi 10:b0999f69c775 140 //--- integral anti-windup ---
aalawfi 10:b0999f69c775 141 if (controllerOutputLeft > 1.0){
aalawfi 10:b0999f69c775 142 if (errorAreaLeft > 0.0){
aalawfi 10:b0999f69c775 143 clampLeft = true;
aalawfi 5:636c3fe18aa8 144 }
aalawfi 10:b0999f69c775 145 if (errorAreaLeft < 0.0){
aalawfi 10:b0999f69c775 146 clampLeft = false;
aalawfi 10:b0999f69c775 147 }
aalawfi 10:b0999f69c775 148 } else {
aalawfi 10:b0999f69c775 149 clampLeft = false;
aalawfi 5:636c3fe18aa8 150 }
aalawfi 5:636c3fe18aa8 151
aalawfi 5:636c3fe18aa8 152 if (controllerOutputRight > 1.0){
aalawfi 5:636c3fe18aa8 153 if (errorAreaRight > 0.0){
aalawfi 5:636c3fe18aa8 154 clampRight = true;
aalawfi 5:636c3fe18aa8 155 }
aalawfi 5:636c3fe18aa8 156 if (errorAreaRight < 0.0){
aalawfi 5:636c3fe18aa8 157 clampRight = false;
aalawfi 5:636c3fe18aa8 158 }
aalawfi 5:636c3fe18aa8 159 } else {
aalawfi 5:636c3fe18aa8 160 clampRight = false;
aalawfi 5:636c3fe18aa8 161 }
aalawfi 5:636c3fe18aa8 162
quarren42 17:d2c98ebda90b 163
aalawfi 5:636c3fe18aa8 164 //--- set motors to calculated output ---
quarren42 17:d2c98ebda90b 165 motorLeft.write(dutyCycleLeft); // 0.2 For debugging
quarren42 17:d2c98ebda90b 166 motorRight.write(dutyCycleRight);
aalawfi 9:5320c2dfb913 167
aalawfi 3:25c6bf0abc00 168 //--- motor braking ---
aalawfi 3:25c6bf0abc00 169 /*
aalawfi 3:25c6bf0abc00 170 if (controllerOutputLeft < 0.0){
aalawfi 3:25c6bf0abc00 171 brakeLeft = 1;
aalawfi 3:25c6bf0abc00 172 } else {
aalawfi 3:25c6bf0abc00 173 brakeLeft = 0;
aalawfi 3:25c6bf0abc00 174 }
aalawfi 3:25c6bf0abc00 175
aalawfi 3:25c6bf0abc00 176 if (controllerOutputRight < 0.0){
aalawfi 3:25c6bf0abc00 177 brakeRight = 1;
aalawfi 3:25c6bf0abc00 178 } else {
aalawfi 3:25c6bf0abc00 179 brakeRight = 0;
aalawfi 3:25c6bf0abc00 180 }
aalawfi 3:25c6bf0abc00 181 */
aalawfi 9:5320c2dfb913 182 }
aalawfi 10:b0999f69c775 183 else {
aalawfi 10:b0999f69c775 184 motorLeft.write(0.0);
aalawfi 10:b0999f69c775 185 motorRight.write(0.0);
aalawfi 10:b0999f69c775 186 }
aalawfi 3:25c6bf0abc00 187 }