servodisc goodness
main.cpp@4:6e290eb553cd, 2018-01-10 (annotated)
- Committer:
- benkatz
- Date:
- Wed Jan 10 04:44:10 2018 +0000
- Revision:
- 4:6e290eb553cd
- Parent:
- 3:2e9713c61c2d
- Child:
- 5:96cd67bcac8c
differential serial works
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
benkatz | 0:92d18e011d98 | 1 | #include "mbed.h" |
benkatz | 0:92d18e011d98 | 2 | |
benkatz | 1:27b535673eed | 3 | #define PI 3.14159265f |
benkatz | 1:27b535673eed | 4 | #define PWM_ARR 0x2E8 // PWM timer auto-reload |
benkatz | 1:27b535673eed | 5 | #define DT 0.00002067f // PWM_ARR/36 MHz |
benkatz | 1:27b535673eed | 6 | #define CPR 8000.0f // Encoder counts/revolution |
benkatz | 3:2e9713c61c2d | 7 | #define J 0.000065f // Inertia |
benkatz | 3:2e9713c61c2d | 8 | #define KT 0.0678f // Torque Constant |
benkatz | 1:27b535673eed | 9 | #define R 0.85f // Resistance |
benkatz | 3:2e9713c61c2d | 10 | #define V_IN 20.0f // DC input voltage |
benkatz | 3:2e9713c61c2d | 11 | #define K_SAT 22000.0f // Controller saturation gain |
benkatz | 3:2e9713c61c2d | 12 | #define DTC_MAX 0.97f // Max duty cycle (limited by bootstrapping) |
benkatz | 1:27b535673eed | 13 | #define V V_IN*DTC_MAX // Max useable voltage |
benkatz | 0:92d18e011d98 | 14 | |
benkatz | 3:2e9713c61c2d | 15 | #define TICKSTORAD(x) (float)x*2.0f*PI/CPR |
benkatz | 0:92d18e011d98 | 16 | #define CONSTRAIN(x,min,max) ((x)<(min)?(min):((x)>(max)?(max):(x))) |
benkatz | 0:92d18e011d98 | 17 | |
benkatz | 1:27b535673eed | 18 | Serial pc (PA_2, PA_3); // Serial to programming header |
benkatz | 1:27b535673eed | 19 | Serial io(PB_6, PB_7); // Differential Serial to JST Header |
benkatz | 1:27b535673eed | 20 | DigitalIn id_1(PB_3); // ID Setting Jumpers |
benkatz | 1:27b535673eed | 21 | DigitalIn id_2(PB_4); |
benkatz | 1:27b535673eed | 22 | DigitalIn id_3(PB_5); |
benkatz | 1:27b535673eed | 23 | DigitalOut led(PA_15); // Debug LED |
benkatz | 1:27b535673eed | 24 | DigitalIn d_in(PA_4); // LED on input from AND Board |
benkatz | 1:27b535673eed | 25 | DigitalOut d_out(PA_5); // LED on output to AND Board |
benkatz | 0:92d18e011d98 | 26 | |
benkatz | 0:92d18e011d98 | 27 | |
benkatz | 0:92d18e011d98 | 28 | void Control(); |
benkatz | 0:92d18e011d98 | 29 | void InitEncoder(); |
benkatz | 0:92d18e011d98 | 30 | void InitPWM(); |
benkatz | 1:27b535673eed | 31 | void InitGPIO(); |
benkatz | 0:92d18e011d98 | 32 | void WriteVoltage( float v); |
benkatz | 1:27b535673eed | 33 | int GetID(); |
benkatz | 4:6e290eb553cd | 34 | void SerialISR(); |
benkatz | 0:92d18e011d98 | 35 | |
benkatz | 0:92d18e011d98 | 36 | |
benkatz | 0:92d18e011d98 | 37 | |
benkatz | 0:92d18e011d98 | 38 | /* Control Variables */ |
benkatz | 1:27b535673eed | 39 | int id; |
benkatz | 3:2e9713c61c2d | 40 | int q_raw, dir, dq_raw = 0; |
benkatz | 3:2e9713c61c2d | 41 | float q, q_old, dq, u, e, q_ref, dqdebug = 0; |
benkatz | 3:2e9713c61c2d | 42 | int count, count2; |
benkatz | 3:2e9713c61c2d | 43 | int controlmode =0; |
benkatz | 3:2e9713c61c2d | 44 | |
benkatz | 3:2e9713c61c2d | 45 | /* Kalman Filter Variables */ |
benkatz | 3:2e9713c61c2d | 46 | float q_est[2] = {0.0f}; |
benkatz | 3:2e9713c61c2d | 47 | float q_meas[2] = {0.0f}; |
benkatz | 3:2e9713c61c2d | 48 | float F[2][2] = {{1.0f, DT},{0.0f, 1.0f}}; |
benkatz | 3:2e9713c61c2d | 49 | float B[2] = {0.0f, DT/J}; |
benkatz | 3:2e9713c61c2d | 50 | float P[2][2] = {0}; |
benkatz | 3:2e9713c61c2d | 51 | float Q[2] = {1.0f, 0.01f}; |
benkatz | 3:2e9713c61c2d | 52 | float Rk[2] = {0.01, 10}; |
benkatz | 3:2e9713c61c2d | 53 | float S[2][2] = {0}; |
benkatz | 3:2e9713c61c2d | 54 | float Y[2] = {0}; |
benkatz | 3:2e9713c61c2d | 55 | float K[2][2] = {0}; |
benkatz | 3:2e9713c61c2d | 56 | float U; |
benkatz | 3:2e9713c61c2d | 57 | |
benkatz | 3:2e9713c61c2d | 58 | |
benkatz | 3:2e9713c61c2d | 59 | int16_t log_vec[2500] = {0}; |
benkatz | 3:2e9713c61c2d | 60 | //int16_t log_vec_2[1250] = {0}; |
benkatz | 3:2e9713c61c2d | 61 | |
benkatz | 0:92d18e011d98 | 62 | |
benkatz | 1:27b535673eed | 63 | /* PWM Timer Interrupt */ |
benkatz | 1:27b535673eed | 64 | extern "C" void TIM1_UP_TIM16_IRQHandler(void) { |
benkatz | 0:92d18e011d98 | 65 | if (TIM1->SR & TIM_SR_UIF ) { |
benkatz | 0:92d18e011d98 | 66 | } |
benkatz | 0:92d18e011d98 | 67 | count++; |
benkatz | 3:2e9713c61c2d | 68 | |
benkatz | 3:2e9713c61c2d | 69 | if(count>1000 && count<2000){ |
benkatz | 3:2e9713c61c2d | 70 | q_ref = 1.57f; |
benkatz | 3:2e9713c61c2d | 71 | //ref = 18000.0f; |
benkatz | 3:2e9713c61c2d | 72 | } |
benkatz | 3:2e9713c61c2d | 73 | |
benkatz | 3:2e9713c61c2d | 74 | if(count>2000 && count<3000){ |
benkatz | 3:2e9713c61c2d | 75 | q_ref = 0.0f; |
benkatz | 3:2e9713c61c2d | 76 | //ref = 0; |
benkatz | 3:2e9713c61c2d | 77 | //count = 0; |
benkatz | 3:2e9713c61c2d | 78 | } |
benkatz | 3:2e9713c61c2d | 79 | if(count>3000 && count<4000){ |
benkatz | 3:2e9713c61c2d | 80 | q_ref = -1.57f; |
benkatz | 3:2e9713c61c2d | 81 | } |
benkatz | 3:2e9713c61c2d | 82 | |
benkatz | 3:2e9713c61c2d | 83 | if(count>4500){ |
benkatz | 3:2e9713c61c2d | 84 | controlmode = 1; |
benkatz | 3:2e9713c61c2d | 85 | } |
benkatz | 3:2e9713c61c2d | 86 | if(count<5000){ |
benkatz | 3:2e9713c61c2d | 87 | //log_vec_2[count/4] = (int)(q_est[1]*10.0f); |
benkatz | 3:2e9713c61c2d | 88 | log_vec[count/2] = (int)(q*1000.0f); |
benkatz | 3:2e9713c61c2d | 89 | } |
benkatz | 3:2e9713c61c2d | 90 | |
benkatz | 3:2e9713c61c2d | 91 | if(count>20000 && count<22500){ |
benkatz | 3:2e9713c61c2d | 92 | //printf("%d\n\r", log_vec[count2]); |
benkatz | 3:2e9713c61c2d | 93 | //wait_us(200); |
benkatz | 3:2e9713c61c2d | 94 | //printf("%d\n\r", log_vec_2[count2]); |
benkatz | 3:2e9713c61c2d | 95 | //wait_us(200); |
benkatz | 3:2e9713c61c2d | 96 | count2++; |
benkatz | 3:2e9713c61c2d | 97 | } |
benkatz | 3:2e9713c61c2d | 98 | |
benkatz | 3:2e9713c61c2d | 99 | |
benkatz | 0:92d18e011d98 | 100 | Control(); |
benkatz | 3:2e9713c61c2d | 101 | /* |
benkatz | 1:27b535673eed | 102 | if(count > 5000){ |
benkatz | 3:2e9713c61c2d | 103 | //io.printf("derp\n\r"); |
benkatz | 3:2e9713c61c2d | 104 | //pc.printf("derp\n\r"); |
benkatz | 3:2e9713c61c2d | 105 | //pc.printf("%d %f\n\r", q_raw, e); |
benkatz | 3:2e9713c61c2d | 106 | printf("%f %f\n\r", dq, dqdebug); |
benkatz | 3:2e9713c61c2d | 107 | //d_out = !d_out; |
benkatz | 0:92d18e011d98 | 108 | count = 0; |
benkatz | 0:92d18e011d98 | 109 | } |
benkatz | 3:2e9713c61c2d | 110 | */ |
benkatz | 0:92d18e011d98 | 111 | TIM1->SR = 0x0; // reset the status register |
benkatz | 0:92d18e011d98 | 112 | } |
benkatz | 0:92d18e011d98 | 113 | |
benkatz | 3:2e9713c61c2d | 114 | |
benkatz | 0:92d18e011d98 | 115 | /* Main Loop */ |
benkatz | 0:92d18e011d98 | 116 | int main() { |
benkatz | 1:27b535673eed | 117 | |
benkatz | 3:2e9713c61c2d | 118 | pc.baud(921600); |
benkatz | 1:27b535673eed | 119 | io.baud(921600); |
benkatz | 3:2e9713c61c2d | 120 | |
benkatz | 4:6e290eb553cd | 121 | |
benkatz | 3:2e9713c61c2d | 122 | //pc.printf("\n\r Rubix Controller\n\r"); |
benkatz | 1:27b535673eed | 123 | id_1.mode(PullUp); |
benkatz | 1:27b535673eed | 124 | id_2.mode(PullUp); |
benkatz | 1:27b535673eed | 125 | id_3.mode(PullUp); |
benkatz | 3:2e9713c61c2d | 126 | id = GetID(); |
benkatz | 3:2e9713c61c2d | 127 | pc.printf(" Motor ID: %d\n\r", id); |
benkatz | 3:2e9713c61c2d | 128 | |
benkatz | 3:2e9713c61c2d | 129 | //d_in.mode(PullDown); |
benkatz | 1:27b535673eed | 130 | led = 1; |
benkatz | 1:27b535673eed | 131 | d_out = 1; |
benkatz | 3:2e9713c61c2d | 132 | //wait(.1); |
benkatz | 1:27b535673eed | 133 | |
benkatz | 0:92d18e011d98 | 134 | InitPWM(); |
benkatz | 3:2e9713c61c2d | 135 | InitEncoder(); |
benkatz | 3:2e9713c61c2d | 136 | //pc.printf("Initializing Encoder\n\r"); |
benkatz | 3:2e9713c61c2d | 137 | //pc.printf("Initializing PWM\n\r"); |
benkatz | 3:2e9713c61c2d | 138 | //wait(.1); |
benkatz | 4:6e290eb553cd | 139 | io.attach(&SerialISR); |
benkatz | 0:92d18e011d98 | 140 | while(1) { |
benkatz | 0:92d18e011d98 | 141 | } |
benkatz | 0:92d18e011d98 | 142 | } |
benkatz | 0:92d18e011d98 | 143 | |
benkatz | 1:27b535673eed | 144 | /* Position Control */ |
benkatz | 0:92d18e011d98 | 145 | void Control(void){ |
benkatz | 3:2e9713c61c2d | 146 | |
benkatz | 3:2e9713c61c2d | 147 | // Sample Position and Velocity // |
benkatz | 3:2e9713c61c2d | 148 | q_raw = TIM2->CNT; |
benkatz | 3:2e9713c61c2d | 149 | dir = -2*(((TIM2->CR1)>>4)&1)+1; |
benkatz | 3:2e9713c61c2d | 150 | dq_raw = dir*(TIM15->CCR1); |
benkatz | 0:92d18e011d98 | 151 | q = TICKSTORAD(q_raw); |
benkatz | 3:2e9713c61c2d | 152 | //dq = (q - q_old)/DT; |
benkatz | 3:2e9713c61c2d | 153 | dq = (18000000.0f*4.0f*2.0f*PI/CPR)/((float)dq_raw); |
benkatz | 3:2e9713c61c2d | 154 | if(isinf(dq)){ dq = 0.0f;} |
benkatz | 0:92d18e011d98 | 155 | q_old = q; |
benkatz | 3:2e9713c61c2d | 156 | |
benkatz | 3:2e9713c61c2d | 157 | q_meas[0] = q; |
benkatz | 3:2e9713c61c2d | 158 | q_meas[1] = dq; |
benkatz | 3:2e9713c61c2d | 159 | |
benkatz | 3:2e9713c61c2d | 160 | // Kalman Filter // |
benkatz | 3:2e9713c61c2d | 161 | // Update Model // |
benkatz | 3:2e9713c61c2d | 162 | |
benkatz | 3:2e9713c61c2d | 163 | q_est[0] += q_est[1]*F[0][1]; |
benkatz | 3:2e9713c61c2d | 164 | q_est[1] += B[1]*U; |
benkatz | 3:2e9713c61c2d | 165 | |
benkatz | 3:2e9713c61c2d | 166 | |
benkatz | 3:2e9713c61c2d | 167 | P[0][0] += Q[0] + DT*P[1][0] + DT*(P[0][1] + DT*P[1][1]); |
benkatz | 3:2e9713c61c2d | 168 | P[0][1] += DT*P[1][1]; |
benkatz | 3:2e9713c61c2d | 169 | P[1][0] += DT*P[1][1]; |
benkatz | 3:2e9713c61c2d | 170 | P[1][1] += Q[1]; |
benkatz | 3:2e9713c61c2d | 171 | |
benkatz | 3:2e9713c61c2d | 172 | //Calculate Kalman Gains// |
benkatz | 3:2e9713c61c2d | 173 | S[0][0] = P[0][0] + Rk[0]; |
benkatz | 3:2e9713c61c2d | 174 | S[0][1] = P[0][1]; |
benkatz | 3:2e9713c61c2d | 175 | S[1][0] = P[1][0]; |
benkatz | 3:2e9713c61c2d | 176 | S[1][1] = P[1][1] + Rk[1]; |
benkatz | 3:2e9713c61c2d | 177 | float denom = (S[0][0]*S[1][1] - S[0][1]*S[1][0]); |
benkatz | 3:2e9713c61c2d | 178 | K[0][0] = (P[0][0]*S[1][1])/denom - (P[0][1]*S[1][0])/denom; |
benkatz | 3:2e9713c61c2d | 179 | K[0][1] = (P[0][1]*S[0][0])/denom - (P[0][0]*S[0][1])/denom; |
benkatz | 3:2e9713c61c2d | 180 | K[1][0] = (P[1][0]*S[1][1])/(S[0][0]*S[1][1] - S[0][1]*S[1][0]) - (P[1][1]*S[1][0])/denom; |
benkatz | 3:2e9713c61c2d | 181 | K[1][1] = (P[1][1]*S[0][0])/(S[0][0]*S[1][1] - S[0][1]*S[1][0]) - (P[1][0]*S[0][1])/denom; |
benkatz | 3:2e9713c61c2d | 182 | |
benkatz | 3:2e9713c61c2d | 183 | Y[0] = q_meas[0] - q_est[0]; |
benkatz | 3:2e9713c61c2d | 184 | Y[1] = q_meas[1] - q_est[1]; |
benkatz | 3:2e9713c61c2d | 185 | |
benkatz | 3:2e9713c61c2d | 186 | // Update Estimate // |
benkatz | 3:2e9713c61c2d | 187 | q_est[0] += K[0][0]*Y[0] + K[0][1]*Y[1]; |
benkatz | 3:2e9713c61c2d | 188 | q_est[1] += K[1][0]*Y[0] + K[1][1]*Y[1]; |
benkatz | 3:2e9713c61c2d | 189 | |
benkatz | 3:2e9713c61c2d | 190 | P[0][0] = -K[0][1]*P[1][0] - P[0][0]*(K[0][0] - 1.0f); |
benkatz | 3:2e9713c61c2d | 191 | P[0][1] = -K[0][1]*P[1][1] - P[0][1]*(K[0][0] - 1.0f); |
benkatz | 3:2e9713c61c2d | 192 | P[1][0] = -K[1][0]*P[0][0] - P[1][0]*(K[1][1] - 1.0f); |
benkatz | 3:2e9713c61c2d | 193 | P[1][1] = -K[1][0]*P[0][1] - P[1][1]*(K[1][1] - 1.0f); |
benkatz | 3:2e9713c61c2d | 194 | |
benkatz | 3:2e9713c61c2d | 195 | |
benkatz | 3:2e9713c61c2d | 196 | |
benkatz | 3:2e9713c61c2d | 197 | // Control Law // |
benkatz | 3:2e9713c61c2d | 198 | if(controlmode == 0){ |
benkatz | 3:2e9713c61c2d | 199 | e = K_SAT*((q_ref - q) + (abs(dq)*dq*1.3f*R*J)/(2.0f*KT*(-V - KT*abs(dq)))); // Bullshit sliding mode control with nonlinear sliding surface, for minimum-time response |
benkatz | 3:2e9713c61c2d | 200 | //e = K_SAT*((q_ref - q) + (abs(q_est[1])*q_est[1]*1.3f*R*J)/(2.0f*KT*(-V - 1.0f*KT*abs(q_est[1])))); // Bullshit sliding mode control with nonlinear sliding surface, for minimum-time response |
benkatz | 3:2e9713c61c2d | 201 | |
benkatz | 3:2e9713c61c2d | 202 | } |
benkatz | 3:2e9713c61c2d | 203 | //q_ref = 0.0f; |
benkatz | 3:2e9713c61c2d | 204 | if(controlmode == 1){ |
benkatz | 3:2e9713c61c2d | 205 | e = 0; |
benkatz | 3:2e9713c61c2d | 206 | //e = 40.0f*(q_ref - q) + .2f*(0.0f-dq); |
benkatz | 3:2e9713c61c2d | 207 | } |
benkatz | 0:92d18e011d98 | 208 | u = CONSTRAIN(e, -V, V); |
benkatz | 3:2e9713c61c2d | 209 | WriteVoltage(u); |
benkatz | 3:2e9713c61c2d | 210 | U = KT*(u - KT*dq)/R; |
benkatz | 3:2e9713c61c2d | 211 | //WriteVoltage(-10.0f); |
benkatz | 1:27b535673eed | 212 | } |
benkatz | 1:27b535673eed | 213 | |
benkatz | 1:27b535673eed | 214 | /* Set motor voltage */ |
benkatz | 1:27b535673eed | 215 | void WriteVoltage(float v){ |
benkatz | 1:27b535673eed | 216 | if(v>0){ |
benkatz | 1:27b535673eed | 217 | TIM1->CCR1 = 0; |
benkatz | 1:27b535673eed | 218 | TIM1->CCR2 = (int) (PWM_ARR*(v/V)); |
benkatz | 1:27b535673eed | 219 | } |
benkatz | 3:2e9713c61c2d | 220 | else if(v<=0){ |
benkatz | 1:27b535673eed | 221 | TIM1->CCR2 = 0; |
benkatz | 3:2e9713c61c2d | 222 | TIM1->CCR1 = (int) (PWM_ARR*(abs(v)/V)); |
benkatz | 1:27b535673eed | 223 | } |
benkatz | 0:92d18e011d98 | 224 | } |
benkatz | 0:92d18e011d98 | 225 | |
benkatz | 3:2e9713c61c2d | 226 | void SerialISR(void){ |
benkatz | 3:2e9713c61c2d | 227 | |
benkatz | 4:6e290eb553cd | 228 | io.putc(io.getc()); |
benkatz | 3:2e9713c61c2d | 229 | |
benkatz | 3:2e9713c61c2d | 230 | } |
benkatz | 3:2e9713c61c2d | 231 | |
benkatz | 3:2e9713c61c2d | 232 | |
benkatz | 1:27b535673eed | 233 | /* Read ID Jumpers */ |
benkatz | 1:27b535673eed | 234 | int GetID(void){ |
benkatz | 1:27b535673eed | 235 | int i1 = !id_1.read(); |
benkatz | 1:27b535673eed | 236 | int i2 = !id_2.read(); |
benkatz | 1:27b535673eed | 237 | int i3 = !id_3.read(); |
benkatz | 1:27b535673eed | 238 | return (i1<<2) | (i2<<1) | i3; |
benkatz | 0:92d18e011d98 | 239 | } |
benkatz | 0:92d18e011d98 | 240 | |
benkatz | 1:27b535673eed | 241 | /* Initialize Encoder */ |
benkatz | 0:92d18e011d98 | 242 | void InitEncoder(void) { |
benkatz | 0:92d18e011d98 | 243 | // configure GPIO PA0 & PA1 as inputs for Encoder |
benkatz | 3:2e9713c61c2d | 244 | //RCC->AHBENR |= RCC_AHBENR_GPIOAEN; // enable the clock to GPIOA |
benkatz | 1:27b535673eed | 245 | GPIOA->MODER |= GPIO_MODER_MODER0_1 | GPIO_MODER_MODER1_1 ; // PA0 & PA1 as Alternate Function |
benkatz | 1:27b535673eed | 246 | GPIOA->OTYPER |= GPIO_OTYPER_OT_0 | GPIO_OTYPER_OT_1 ; // PA0 & PA1 as Inputs |
benkatz | 1:27b535673eed | 247 | GPIOA->OSPEEDR |= 0x00000011; // GPIO Speed |
benkatz | 3:2e9713c61c2d | 248 | //GPIOA->PUPDR |= GPIO_PUPDR_PUPDR0_1 | GPIO_PUPDR_PUPDR1_1 ; // Pull Down |
benkatz | 1:27b535673eed | 249 | GPIOA->AFR[0] |= 0x00000011 ; // AF01 for PA0 & PA1 |
benkatz | 1:27b535673eed | 250 | GPIOA->AFR[1] |= 0x00000000 ; // |
benkatz | 1:27b535673eed | 251 | |
benkatz | 0:92d18e011d98 | 252 | // configure TIM2 as Encoder input |
benkatz | 3:2e9713c61c2d | 253 | TIM2->DIER = 0x00; |
benkatz | 3:2e9713c61c2d | 254 | TIM2->EGR = 0x0; |
benkatz | 3:2e9713c61c2d | 255 | NVIC_DisableIRQ(TIM2_IRQn); |
benkatz | 3:2e9713c61c2d | 256 | |
benkatz | 1:27b535673eed | 257 | RCC->APB1ENR |= 0x00000001; // Enable clock for TIM2 |
benkatz | 1:27b535673eed | 258 | TIM2->CR1 = 0x0001; // CEN(Counter Enable)='1' |
benkatz | 1:27b535673eed | 259 | TIM2->SMCR = 0x0003; // SMS='011' (Encoder mode 3) |
benkatz | 1:27b535673eed | 260 | TIM2->CCMR1 = 0x5151; // CC1S='01' CC2S='01' |
benkatz | 1:27b535673eed | 261 | TIM2->CCMR2 = 0x0000; |
benkatz | 1:27b535673eed | 262 | TIM2->CCER = 0x0011; // CC1P CC2P |
benkatz | 1:27b535673eed | 263 | TIM2->PSC = 0x0000; // Prescaler = (0+1) |
benkatz | 1:27b535673eed | 264 | TIM2->CNT = 0x0000; //reset the counter before we use it |
benkatz | 3:2e9713c61c2d | 265 | |
benkatz | 3:2e9713c61c2d | 266 | TIM2->CR2 = 0x030; //MMS = 101 |
benkatz | 3:2e9713c61c2d | 267 | __TIM15_CLK_ENABLE(); |
benkatz | 3:2e9713c61c2d | 268 | TIM15->PSC = 0x03; |
benkatz | 3:2e9713c61c2d | 269 | TIM15->SMCR = 0x4; //TS = 010 for ITR2, SMS = 100 |
benkatz | 3:2e9713c61c2d | 270 | TIM15->CCMR1 = 0x3;// CC1S = 11, IC1 mapped on TRC |
benkatz | 3:2e9713c61c2d | 271 | TIM15->CCER |= TIM_CCER_CC1P; |
benkatz | 3:2e9713c61c2d | 272 | TIM15->CCER |= TIM_CCER_CC1E; |
benkatz | 3:2e9713c61c2d | 273 | TIM15->CR1 = 0x1; |
benkatz | 3:2e9713c61c2d | 274 | |
benkatz | 0:92d18e011d98 | 275 | } |
benkatz | 0:92d18e011d98 | 276 | |
benkatz | 3:2e9713c61c2d | 277 | |
benkatz | 1:27b535673eed | 278 | /* Initialize PWM */ |
benkatz | 0:92d18e011d98 | 279 | void InitPWM(void){ |
benkatz | 1:27b535673eed | 280 | RCC->AHBENR |= RCC_AHBENR_GPIOAEN; // enable the clock to GPIOA |
benkatz | 1:27b535673eed | 281 | RCC->AHBENR |= RCC_AHBENR_GPIOBEN; // enable the clock to GPIOB |
benkatz | 1:27b535673eed | 282 | RCC->APB2ENR |= RCC_APB2ENR_TIM1EN; // enable TIM1 clock |
benkatz | 0:92d18e011d98 | 283 | |
benkatz | 0:92d18e011d98 | 284 | GPIOA->MODER |= GPIO_MODER_MODER7_1 | GPIO_MODER_MODER8_1 | GPIO_MODER_MODER9_1 ; //PA_7, PA_8, PA_9 to alternate funtion mode |
benkatz | 0:92d18e011d98 | 285 | GPIOB->MODER |= GPIO_MODER_MODER0_1; // PB_0 to alternate function mode |
benkatz | 0:92d18e011d98 | 286 | GPIOA->AFR[0] |= 0x60000000; // PA_7 to alternate function 6 |
benkatz | 0:92d18e011d98 | 287 | GPIOA->AFR[1] |= 0x00000066; // PA_8, PA_9 to alternate function 6 |
benkatz | 0:92d18e011d98 | 288 | GPIOB->AFR[0] |= 0x00000006; // PB_0 to alternate function 6 |
benkatz | 0:92d18e011d98 | 289 | |
benkatz | 0:92d18e011d98 | 290 | //PWM Setup |
benkatz | 0:92d18e011d98 | 291 | TIM1->CCMR1 |= 0x6060; // Enable output compare 1 and 2 |
benkatz | 0:92d18e011d98 | 292 | TIM1->CCER |= TIM_CCER_CC1E | TIM_CCER_CC1NE | TIM_CCER_CC2NE | TIM_CCER_CC2E; // enable outputs 1, 2, and complementary outputs |
benkatz | 1:27b535673eed | 293 | TIM1->BDTR |= TIM_BDTR_MOE | 0xF; // MOE = 1 | set dead-time |
benkatz | 1:27b535673eed | 294 | TIM1->PSC = 0x0; // no prescaler, timer counts up in sync with the peripheral clock |
benkatz | 1:27b535673eed | 295 | TIM1->ARR = PWM_ARR; // set auto reload |
benkatz | 1:27b535673eed | 296 | TIM1->CR1 |= TIM_CR1_ARPE; // autoreload on, |
benkatz | 1:27b535673eed | 297 | TIM1->CR1 |= TIM_CR1_CEN; // enable TIM1 |
benkatz | 0:92d18e011d98 | 298 | |
benkatz | 3:2e9713c61c2d | 299 | |
benkatz | 1:27b535673eed | 300 | NVIC_EnableIRQ(TIM1_UP_TIM16_IRQn); //Enable TIM1 IRQ |
benkatz | 1:27b535673eed | 301 | TIM1->DIER |= TIM_DIER_UIE; // enable update interrupt |
benkatz | 1:27b535673eed | 302 | TIM1->CR1 |= 0x40; //CMS = 10, interrupt only when counting up |
benkatz | 1:27b535673eed | 303 | TIM1->RCR |= 0x001; // update event once per up/down count of tim1 |
benkatz | 3:2e9713c61c2d | 304 | TIM1->EGR |= TIM_EGR_UG; |
benkatz | 3:2e9713c61c2d | 305 | |
benkatz | 3:2e9713c61c2d | 306 | } |
benkatz | 3:2e9713c61c2d | 307 |