Alvee Ahmed
/
Hobbyking_Cheetah_Compact_DRV8323_14bit
customizing code for Aliexpress 14 bit version with MA702
FOC/foc.cpp@25:f5741040c4bb, 2017-04-09 (annotated)
- Committer:
- benkatz
- Date:
- Sun Apr 09 03:05:52 2017 +0000
- Revision:
- 25:f5741040c4bb
- Parent:
- 24:58c2d7571207
- Child:
- 26:2b865c00d7e9
Set current bandwidth from serial interface
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
benkatz | 24:58c2d7571207 | 1 | #include "user_config.h" |
benkatz | 22:60276ba87ac6 | 2 | #include "foc.h" |
benkatz | 22:60276ba87ac6 | 3 | |
benkatz | 22:60276ba87ac6 | 4 | //#include "FastMath.h" |
benkatz | 22:60276ba87ac6 | 5 | //using namespace FastMath; |
benkatz | 22:60276ba87ac6 | 6 | |
benkatz | 22:60276ba87ac6 | 7 | |
benkatz | 22:60276ba87ac6 | 8 | void abc( float theta, float d, float q, float *a, float *b, float *c){ |
benkatz | 25:f5741040c4bb | 9 | /// Inverse DQ0 Transform /// |
benkatz | 22:60276ba87ac6 | 10 | ///Phase current amplitude = lengh of dq vector/// |
benkatz | 22:60276ba87ac6 | 11 | ///i.e. iq = 1, id = 0, peak phase current of 1/// |
benkatz | 22:60276ba87ac6 | 12 | |
benkatz | 22:60276ba87ac6 | 13 | *a = d*cosf(-theta) + q*sinf(-theta); |
benkatz | 22:60276ba87ac6 | 14 | *b = d*cosf((2.0f*PI/3.0f)-theta) + q*sinf((2.0f*PI/3.0f)-theta); |
benkatz | 22:60276ba87ac6 | 15 | *c = d*cosf((-2.0f*PI/3.0f)-theta) + q*sinf((-2.0f*PI/3.0f)-theta); |
benkatz | 22:60276ba87ac6 | 16 | } |
benkatz | 22:60276ba87ac6 | 17 | |
benkatz | 22:60276ba87ac6 | 18 | void dq0(float theta, float a, float b, float c, float *d, float *q){ |
benkatz | 25:f5741040c4bb | 19 | /// DQ0 Transform /// |
benkatz | 22:60276ba87ac6 | 20 | ///Phase current amplitude = lengh of dq vector/// |
benkatz | 22:60276ba87ac6 | 21 | ///i.e. iq = 1, id = 0, peak phase current of 1/// |
benkatz | 22:60276ba87ac6 | 22 | |
benkatz | 22:60276ba87ac6 | 23 | *d = (2.0f/3.0f)*(a*cosf(-theta) + b*cosf((2.0f*PI/3.0f)-theta) + c*cosf((-2.0f*PI/3.0f)-theta)); |
benkatz | 22:60276ba87ac6 | 24 | *q = (2.0f/3.0f)*(a*sinf(-theta) + b*sinf((2.0f*PI/3.0f)-theta) + c*sinf((-2.0f*PI/3.0f)-theta)); |
benkatz | 22:60276ba87ac6 | 25 | } |
benkatz | 22:60276ba87ac6 | 26 | |
benkatz | 22:60276ba87ac6 | 27 | void svm(float v_bus, float u, float v, float w, float *dtc_u, float *dtc_v, float *dtc_w){ |
benkatz | 25:f5741040c4bb | 28 | /// Space Vector Modulation /// |
benkatz | 25:f5741040c4bb | 29 | /// u,v,w amplitude = v_bus for full modulation depth /// |
benkatz | 22:60276ba87ac6 | 30 | |
benkatz | 22:60276ba87ac6 | 31 | float v_offset = (fminf3(u, v, w) + fmaxf3(u, v, w))/2.0f; |
benkatz | 23:2adf23ee0305 | 32 | *dtc_u = fminf(fmaxf(((u - v_offset)*0.5f/v_bus + ((DTC_MAX-DTC_MIN)/2)), DTC_MIN), DTC_MAX); |
benkatz | 23:2adf23ee0305 | 33 | *dtc_v = fminf(fmaxf(((v - v_offset)*0.5f/v_bus + ((DTC_MAX-DTC_MIN)/2)), DTC_MIN), DTC_MAX); |
benkatz | 23:2adf23ee0305 | 34 | *dtc_w = fminf(fmaxf(((w - v_offset)*0.5f/v_bus + ((DTC_MAX-DTC_MIN)/2)), DTC_MIN), DTC_MAX); |
benkatz | 22:60276ba87ac6 | 35 | |
benkatz | 22:60276ba87ac6 | 36 | } |
benkatz | 22:60276ba87ac6 | 37 | |
benkatz | 25:f5741040c4bb | 38 | void zero_current(int *offset_1, int *offset_2){ // Measure zero-offset of the current sensors |
benkatz | 22:60276ba87ac6 | 39 | int adc1_offset = 0; |
benkatz | 22:60276ba87ac6 | 40 | int adc2_offset = 0; |
benkatz | 22:60276ba87ac6 | 41 | int n = 1024; |
benkatz | 25:f5741040c4bb | 42 | for (int i = 0; i<n; i++){ // Average n samples of the ADC |
benkatz | 22:60276ba87ac6 | 43 | ADC1->CR2 |= 0x40000000; |
benkatz | 22:60276ba87ac6 | 44 | wait(.001); |
benkatz | 22:60276ba87ac6 | 45 | adc2_offset += ADC2->DR; |
benkatz | 22:60276ba87ac6 | 46 | adc1_offset += ADC1->DR; |
benkatz | 22:60276ba87ac6 | 47 | } |
benkatz | 22:60276ba87ac6 | 48 | *offset_1 = adc1_offset/n; |
benkatz | 22:60276ba87ac6 | 49 | *offset_2 = adc2_offset/n; |
benkatz | 22:60276ba87ac6 | 50 | } |
benkatz | 22:60276ba87ac6 | 51 | |
benkatz | 22:60276ba87ac6 | 52 | void reset_foc(ControllerStruct *controller){ |
benkatz | 22:60276ba87ac6 | 53 | controller->q_int = 0; |
benkatz | 22:60276ba87ac6 | 54 | controller->d_int = 0; |
benkatz | 22:60276ba87ac6 | 55 | } |
benkatz | 22:60276ba87ac6 | 56 | |
benkatz | 22:60276ba87ac6 | 57 | |
benkatz | 22:60276ba87ac6 | 58 | void commutate(ControllerStruct *controller, GPIOStruct *gpio, float theta){ |
benkatz | 25:f5741040c4bb | 59 | /// Commutation Loop /// |
benkatz | 25:f5741040c4bb | 60 | controller->loop_count ++; |
benkatz | 25:f5741040c4bb | 61 | if(PHASE_ORDER){ // Check current sensor ordering |
benkatz | 25:f5741040c4bb | 62 | controller->i_b = I_SCALE*(float)(controller->adc2_raw - controller->adc2_offset); // Calculate phase currents from ADC readings |
benkatz | 22:60276ba87ac6 | 63 | controller->i_c = I_SCALE*(float)(controller->adc1_raw - controller->adc1_offset); |
benkatz | 22:60276ba87ac6 | 64 | } |
benkatz | 22:60276ba87ac6 | 65 | else{ |
benkatz | 25:f5741040c4bb | 66 | controller->i_b = I_SCALE*(float)(controller->adc1_raw - controller->adc1_offset); |
benkatz | 22:60276ba87ac6 | 67 | controller->i_c = I_SCALE*(float)(controller->adc2_raw - controller->adc2_offset); |
benkatz | 22:60276ba87ac6 | 68 | } |
benkatz | 25:f5741040c4bb | 69 | controller->i_a = -controller->i_b - controller->i_c; |
benkatz | 22:60276ba87ac6 | 70 | dq0(controller->theta_elec, controller->i_a, controller->i_b, controller->i_c, &controller->i_d, &controller->i_q); //dq0 transform on currents |
benkatz | 22:60276ba87ac6 | 71 | |
benkatz | 25:f5741040c4bb | 72 | ///Cogging compensation lookup, doesn't actually work yet/// |
benkatz | 23:2adf23ee0305 | 73 | //int ind = theta * (128.0f/(2.0f*PI)); |
benkatz | 23:2adf23ee0305 | 74 | //float cogging_current = controller->cogging[ind]; |
benkatz | 23:2adf23ee0305 | 75 | //float cogging_current = 1.0f*cos(6*theta); |
benkatz | 25:f5741040c4bb | 76 | |
benkatz | 25:f5741040c4bb | 77 | /// PI Controller /// |
benkatz | 22:60276ba87ac6 | 78 | float i_d_error = controller->i_d_ref - controller->i_d; |
benkatz | 23:2adf23ee0305 | 79 | float i_q_error = controller->i_q_ref - controller->i_q;// + cogging_current; |
benkatz | 22:60276ba87ac6 | 80 | float v_d_ff = 2.0f*(2*controller->i_d_ref*R_PHASE); //feed-forward voltage |
benkatz | 22:60276ba87ac6 | 81 | float v_q_ff = 2.0f*(2*controller->i_q_ref*R_PHASE + controller->dtheta_elec*WB*0.8165f); |
benkatz | 22:60276ba87ac6 | 82 | controller->d_int += i_d_error; |
benkatz | 22:60276ba87ac6 | 83 | controller->q_int += i_q_error; |
benkatz | 22:60276ba87ac6 | 84 | |
benkatz | 22:60276ba87ac6 | 85 | //v_d_ff = 0; |
benkatz | 22:60276ba87ac6 | 86 | //v_q_ff = 0; |
benkatz | 22:60276ba87ac6 | 87 | |
benkatz | 25:f5741040c4bb | 88 | limit_norm(&controller->d_int, &controller->q_int, V_BUS/(K_Q*KI_Q)); // Limit integrators to prevent windup |
benkatz | 22:60276ba87ac6 | 89 | //controller->d_int = fminf(fmaxf(controller->d_int, -D_INT_LIM), D_INT_LIM); |
benkatz | 22:60276ba87ac6 | 90 | //controller->q_int = fminf(fmaxf(controller->q_int, -Q_INT_LIM), Q_INT_LIM); |
benkatz | 22:60276ba87ac6 | 91 | |
benkatz | 22:60276ba87ac6 | 92 | |
benkatz | 25:f5741040c4bb | 93 | controller->v_d = K_SCALE*I_BW*i_d_error + K_SCALE*I_BW*controller->d_int;// + v_d_ff; |
benkatz | 25:f5741040c4bb | 94 | controller->v_q = K_SCALE*I_BW*i_q_error + K_SCALE*I_BW*controller->q_int;// + v_q_ff; |
benkatz | 22:60276ba87ac6 | 95 | |
benkatz | 22:60276ba87ac6 | 96 | //controller->v_d = v_d_ff; |
benkatz | 22:60276ba87ac6 | 97 | //controller->v_q = v_q_ff; |
benkatz | 22:60276ba87ac6 | 98 | |
benkatz | 25:f5741040c4bb | 99 | limit_norm(&controller->v_d, &controller->v_q, controller->v_bus); // Normalize voltage vector to lie within curcle of radius v_bus |
benkatz | 22:60276ba87ac6 | 100 | abc(controller->theta_elec, controller->v_d, controller->v_q, &controller->v_u, &controller->v_v, &controller->v_w); //inverse dq0 transform on voltages |
benkatz | 22:60276ba87ac6 | 101 | svm(controller->v_bus, controller->v_u, controller->v_v, controller->v_w, &controller->dtc_u, &controller->dtc_v, &controller->dtc_w); //space vector modulation |
benkatz | 22:60276ba87ac6 | 102 | |
benkatz | 22:60276ba87ac6 | 103 | |
benkatz | 25:f5741040c4bb | 104 | if(PHASE_ORDER){ // Check which phase order to use, |
benkatz | 25:f5741040c4bb | 105 | TIM1->CCR3 = 0x708*(1.0f-controller->dtc_u); // Write duty cycles |
benkatz | 22:60276ba87ac6 | 106 | TIM1->CCR2 = 0x708*(1.0f-controller->dtc_v); |
benkatz | 22:60276ba87ac6 | 107 | TIM1->CCR1 = 0x708*(1.0f-controller->dtc_w); |
benkatz | 22:60276ba87ac6 | 108 | } |
benkatz | 22:60276ba87ac6 | 109 | else{ |
benkatz | 22:60276ba87ac6 | 110 | TIM1->CCR3 = 0x708*(1.0f-controller->dtc_u); |
benkatz | 22:60276ba87ac6 | 111 | TIM1->CCR1 = 0x708*(1.0f-controller->dtc_v); |
benkatz | 22:60276ba87ac6 | 112 | TIM1->CCR2 = 0x708*(1.0f-controller->dtc_w); |
benkatz | 22:60276ba87ac6 | 113 | } |
benkatz | 25:f5741040c4bb | 114 | |
benkatz | 25:f5741040c4bb | 115 | controller->theta_elec = theta; //For some reason putting this at the front breaks thins |
benkatz | 22:60276ba87ac6 | 116 | |
benkatz | 22:60276ba87ac6 | 117 | |
benkatz | 25:f5741040c4bb | 118 | //if(controller->loop_count >400){ |
benkatz | 22:60276ba87ac6 | 119 | //controller->i_q_ref = -controller->i_q_ref; |
benkatz | 25:f5741040c4bb | 120 | // controller->loop_count = 0; |
benkatz | 22:60276ba87ac6 | 121 | |
benkatz | 23:2adf23ee0305 | 122 | //printf("%d %f\n\r", ind, cogging_current); |
benkatz | 22:60276ba87ac6 | 123 | //printf("%f\n\r", controller->theta_elec); |
benkatz | 22:60276ba87ac6 | 124 | //pc.printf("%f %f %f\n\r", controller->i_a, controller->i_b, controller->i_c); |
benkatz | 22:60276ba87ac6 | 125 | //pc.printf("%f %f\n\r", controller->i_d, controller->i_q); |
benkatz | 22:60276ba87ac6 | 126 | //pc.printf("%d %d\n\r", controller->adc1_raw, controller->adc2_raw); |
benkatz | 25:f5741040c4bb | 127 | // } |
benkatz | 22:60276ba87ac6 | 128 | } |
benkatz | 22:60276ba87ac6 | 129 | /* |
benkatz | 22:60276ba87ac6 | 130 | void zero_encoder(ControllerStruct *controller, GPIOStruct *gpio, ){ |
benkatz | 22:60276ba87ac6 | 131 | |
benkatz | 22:60276ba87ac6 | 132 | } |
benkatz | 22:60276ba87ac6 | 133 | */ |