Ben Katz / rubix_controller

servodisc goodness

Dependencies:   mbed-dev-f303

main.cpp@5:96cd67bcac8c, 2018-01-14 (annotated)

Committer:
benkatz
Date:
Sun Jan 14 23:18:09 2018 +0000
Revision:
5:96cd67bcac8c
Parent:
4:6e290eb553cd
Child:
6:1143996ac690
Pre-merge

Who changed what in which revision?

UserRevisionLine numberNew 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 5:96cd67bcac8c 59 //int8_t log_vec[1250] = {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 5:96cd67bcac8c 69 //d_out = !d_out;
benkatz 5:96cd67bcac8c 70
benkatz 3:2e9713c61c2d 71 if(count>1000 && count<2000){
benkatz 3:2e9713c61c2d 72 q_ref = 1.57f;
benkatz 3:2e9713c61c2d 73 //ref = 18000.0f;
benkatz 3:2e9713c61c2d 74 }
benkatz 3:2e9713c61c2d 75
benkatz 3:2e9713c61c2d 76 if(count>2000 && count<3000){
benkatz 3:2e9713c61c2d 77 q_ref = 0.0f;
benkatz 3:2e9713c61c2d 78 //ref = 0;
benkatz 3:2e9713c61c2d 79 //count = 0;
benkatz 3:2e9713c61c2d 80 }
benkatz 3:2e9713c61c2d 81 if(count>3000 && count<4000){
benkatz 3:2e9713c61c2d 82 q_ref = -1.57f;
benkatz 3:2e9713c61c2d 83 }
benkatz 3:2e9713c61c2d 84
benkatz 3:2e9713c61c2d 85 if(count>4500){
benkatz 3:2e9713c61c2d 86 controlmode = 1;
benkatz 3:2e9713c61c2d 87 }
benkatz 5:96cd67bcac8c 88 /*
benkatz 3:2e9713c61c2d 89 if(count<5000){
benkatz 3:2e9713c61c2d 90 //log_vec_2[count/4] = (int)(q_est[1]*10.0f);
benkatz 5:96cd67bcac8c 91 log_vec[count/4] = q_raw>>4;
benkatz 3:2e9713c61c2d 92 }
benkatz 3:2e9713c61c2d 93
benkatz 5:96cd67bcac8c 94 if(count>20000 && count<21250){
benkatz 5:96cd67bcac8c 95 printf("%d\n\r", log_vec[count2]);
benkatz 5:96cd67bcac8c 96 wait_us(80);
benkatz 3:2e9713c61c2d 97 //printf("%d\n\r", log_vec_2[count2]);
benkatz 3:2e9713c61c2d 98 //wait_us(200);
benkatz 3:2e9713c61c2d 99 count2++;
benkatz 3:2e9713c61c2d 100 }
benkatz 3:2e9713c61c2d 101
benkatz 5:96cd67bcac8c 102 */
benkatz 0:92d18e011d98 103 Control();
benkatz 5:96cd67bcac8c 104
benkatz 3:2e9713c61c2d 105 /*
benkatz 1:27b535673eed 106 if(count > 5000){
benkatz 3:2e9713c61c2d 107 //io.printf("derp\n\r");
benkatz 3:2e9713c61c2d 108 //pc.printf("derp\n\r");
benkatz 5:96cd67bcac8c 109 pc.printf("%d \n\r", q_raw);
benkatz 5:96cd67bcac8c 110 //printf("%f %f\n\r", dq, dqdebug);
benkatz 3:2e9713c61c2d 111 //d_out = !d_out;
benkatz 0:92d18e011d98 112 count = 0;
benkatz 0:92d18e011d98 113 }
benkatz 3:2e9713c61c2d 114 */
benkatz 5:96cd67bcac8c 115
benkatz 0:92d18e011d98 116 TIM1->SR = 0x0; // reset the status register
benkatz 0:92d18e011d98 117 }
benkatz 0:92d18e011d98 118
benkatz 3:2e9713c61c2d 119
benkatz 0:92d18e011d98 120 /* Main Loop */
benkatz 0:92d18e011d98 121 int main() {
benkatz 5:96cd67bcac8c 122
benkatz 3:2e9713c61c2d 123 pc.baud(921600);
benkatz 1:27b535673eed 124 io.baud(921600);
benkatz 3:2e9713c61c2d 125
benkatz 5:96cd67bcac8c 126 SystemCoreClockUpdate();
benkatz 5:96cd67bcac8c 127 //printf("%d\n\r", SystemCoreClock);
benkatz 3:2e9713c61c2d 128 //pc.printf("\n\r Rubix Controller\n\r");
benkatz 1:27b535673eed 129 id_1.mode(PullUp);
benkatz 1:27b535673eed 130 id_2.mode(PullUp);
benkatz 1:27b535673eed 131 id_3.mode(PullUp);
benkatz 3:2e9713c61c2d 132 id = GetID();
benkatz 5:96cd67bcac8c 133 //pc.printf(" Motor ID: %d\n\r", id);
benkatz 3:2e9713c61c2d 134
benkatz 3:2e9713c61c2d 135 //d_in.mode(PullDown);
benkatz 1:27b535673eed 136 led = 1;
benkatz 1:27b535673eed 137 d_out = 1;
benkatz 3:2e9713c61c2d 138 //wait(.1);
benkatz 1:27b535673eed 139
benkatz 0:92d18e011d98 140 InitPWM();
benkatz 3:2e9713c61c2d 141 InitEncoder();
benkatz 3:2e9713c61c2d 142 //pc.printf("Initializing Encoder\n\r");
benkatz 3:2e9713c61c2d 143 //pc.printf("Initializing PWM\n\r");
benkatz 3:2e9713c61c2d 144 //wait(.1);
benkatz 4:6e290eb553cd 145 io.attach(&SerialISR);
benkatz 0:92d18e011d98 146 while(1) {
benkatz 0:92d18e011d98 147 }
benkatz 0:92d18e011d98 148 }
benkatz 0:92d18e011d98 149
benkatz 1:27b535673eed 150 /* Position Control */
benkatz 0:92d18e011d98 151 void Control(void){
benkatz 3:2e9713c61c2d 152
benkatz 3:2e9713c61c2d 153 // Sample Position and Velocity //
benkatz 3:2e9713c61c2d 154 q_raw = TIM2->CNT;
benkatz 3:2e9713c61c2d 155 dir = -2*(((TIM2->CR1)>>4)&1)+1;
benkatz 3:2e9713c61c2d 156 dq_raw = dir*(TIM15->CCR1);
benkatz 0:92d18e011d98 157 q = TICKSTORAD(q_raw);
benkatz 3:2e9713c61c2d 158 //dq = (q - q_old)/DT;
benkatz 3:2e9713c61c2d 159 dq = (18000000.0f*4.0f*2.0f*PI/CPR)/((float)dq_raw);
benkatz 3:2e9713c61c2d 160 if(isinf(dq)){ dq = 0.0f;}
benkatz 0:92d18e011d98 161 q_old = q;
benkatz 3:2e9713c61c2d 162
benkatz 3:2e9713c61c2d 163 q_meas[0] = q;
benkatz 3:2e9713c61c2d 164 q_meas[1] = dq;
benkatz 3:2e9713c61c2d 165
benkatz 3:2e9713c61c2d 166 // Kalman Filter //
benkatz 3:2e9713c61c2d 167 // Update Model //
benkatz 5:96cd67bcac8c 168 /*
benkatz 3:2e9713c61c2d 169 q_est[0] += q_est[1]*F[0][1];
benkatz 3:2e9713c61c2d 170 q_est[1] += B[1]*U;
benkatz 3:2e9713c61c2d 171
benkatz 3:2e9713c61c2d 172
benkatz 3:2e9713c61c2d 173 P[0][0] += Q[0] + DT*P[1][0] + DT*(P[0][1] + DT*P[1][1]);
benkatz 3:2e9713c61c2d 174 P[0][1] += DT*P[1][1];
benkatz 3:2e9713c61c2d 175 P[1][0] += DT*P[1][1];
benkatz 3:2e9713c61c2d 176 P[1][1] += Q[1];
benkatz 3:2e9713c61c2d 177
benkatz 3:2e9713c61c2d 178 //Calculate Kalman Gains//
benkatz 3:2e9713c61c2d 179 S[0][0] = P[0][0] + Rk[0];
benkatz 3:2e9713c61c2d 180 S[0][1] = P[0][1];
benkatz 3:2e9713c61c2d 181 S[1][0] = P[1][0];
benkatz 3:2e9713c61c2d 182 S[1][1] = P[1][1] + Rk[1];
benkatz 3:2e9713c61c2d 183 float denom = (S[0][0]*S[1][1] - S[0][1]*S[1][0]);
benkatz 3:2e9713c61c2d 184 K[0][0] = (P[0][0]*S[1][1])/denom - (P[0][1]*S[1][0])/denom;
benkatz 3:2e9713c61c2d 185 K[0][1] = (P[0][1]*S[0][0])/denom - (P[0][0]*S[0][1])/denom;
benkatz 3:2e9713c61c2d 186 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 187 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 188
benkatz 3:2e9713c61c2d 189 Y[0] = q_meas[0] - q_est[0];
benkatz 3:2e9713c61c2d 190 Y[1] = q_meas[1] - q_est[1];
benkatz 3:2e9713c61c2d 191
benkatz 3:2e9713c61c2d 192 // Update Estimate //
benkatz 3:2e9713c61c2d 193 q_est[0] += K[0][0]*Y[0] + K[0][1]*Y[1];
benkatz 3:2e9713c61c2d 194 q_est[1] += K[1][0]*Y[0] + K[1][1]*Y[1];
benkatz 3:2e9713c61c2d 195
benkatz 3:2e9713c61c2d 196 P[0][0] = -K[0][1]*P[1][0] - P[0][0]*(K[0][0] - 1.0f);
benkatz 3:2e9713c61c2d 197 P[0][1] = -K[0][1]*P[1][1] - P[0][1]*(K[0][0] - 1.0f);
benkatz 3:2e9713c61c2d 198 P[1][0] = -K[1][0]*P[0][0] - P[1][0]*(K[1][1] - 1.0f);
benkatz 3:2e9713c61c2d 199 P[1][1] = -K[1][0]*P[0][1] - P[1][1]*(K[1][1] - 1.0f);
benkatz 5:96cd67bcac8c 200 */
benkatz 3:2e9713c61c2d 201
benkatz 3:2e9713c61c2d 202
benkatz 3:2e9713c61c2d 203 // Control Law //
benkatz 3:2e9713c61c2d 204 if(controlmode == 0){
benkatz 3:2e9713c61c2d 205 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 206 //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 207
benkatz 3:2e9713c61c2d 208 }
benkatz 3:2e9713c61c2d 209 //q_ref = 0.0f;
benkatz 3:2e9713c61c2d 210 if(controlmode == 1){
benkatz 3:2e9713c61c2d 211 e = 0;
benkatz 3:2e9713c61c2d 212 //e = 40.0f*(q_ref - q) + .2f*(0.0f-dq);
benkatz 3:2e9713c61c2d 213 }
benkatz 0:92d18e011d98 214 u = CONSTRAIN(e, -V, V);
benkatz 3:2e9713c61c2d 215 WriteVoltage(u);
benkatz 3:2e9713c61c2d 216 U = KT*(u - KT*dq)/R;
benkatz 3:2e9713c61c2d 217 //WriteVoltage(-10.0f);
benkatz 1:27b535673eed 218 }
benkatz 1:27b535673eed 219
benkatz 1:27b535673eed 220 /* Set motor voltage */
benkatz 1:27b535673eed 221 void WriteVoltage(float v){
benkatz 1:27b535673eed 222 if(v>0){
benkatz 1:27b535673eed 223 TIM1->CCR1 = 0;
benkatz 1:27b535673eed 224 TIM1->CCR2 = (int) (PWM_ARR*(v/V));
benkatz 1:27b535673eed 225 }
benkatz 3:2e9713c61c2d 226 else if(v<=0){
benkatz 1:27b535673eed 227 TIM1->CCR2 = 0;
benkatz 3:2e9713c61c2d 228 TIM1->CCR1 = (int) (PWM_ARR*(abs(v)/V));
benkatz 1:27b535673eed 229 }
benkatz 0:92d18e011d98 230 }
benkatz 0:92d18e011d98 231
benkatz 3:2e9713c61c2d 232 void SerialISR(void){
benkatz 3:2e9713c61c2d 233
benkatz 4:6e290eb553cd 234 io.putc(io.getc());
benkatz 3:2e9713c61c2d 235
benkatz 3:2e9713c61c2d 236 }
benkatz 3:2e9713c61c2d 237
benkatz 3:2e9713c61c2d 238
benkatz 1:27b535673eed 239 /* Read ID Jumpers */
benkatz 1:27b535673eed 240 int GetID(void){
benkatz 1:27b535673eed 241 int i1 = !id_1.read();
benkatz 1:27b535673eed 242 int i2 = !id_2.read();
benkatz 1:27b535673eed 243 int i3 = !id_3.read();
benkatz 1:27b535673eed 244 return (i1<<2) | (i2<<1) | i3;
benkatz 0:92d18e011d98 245 }
benkatz 0:92d18e011d98 246
benkatz 1:27b535673eed 247 /* Initialize Encoder */
benkatz 0:92d18e011d98 248 void InitEncoder(void) {
benkatz 0:92d18e011d98 249 // configure GPIO PA0 & PA1 as inputs for Encoder
benkatz 3:2e9713c61c2d 250 //RCC->AHBENR |= RCC_AHBENR_GPIOAEN; // enable the clock to GPIOA
benkatz 1:27b535673eed 251 GPIOA->MODER |= GPIO_MODER_MODER0_1 | GPIO_MODER_MODER1_1 ; // PA0 & PA1 as Alternate Function
benkatz 1:27b535673eed 252 GPIOA->OTYPER |= GPIO_OTYPER_OT_0 | GPIO_OTYPER_OT_1 ; // PA0 & PA1 as Inputs
benkatz 1:27b535673eed 253 GPIOA->OSPEEDR |= 0x00000011; // GPIO Speed
benkatz 3:2e9713c61c2d 254 //GPIOA->PUPDR |= GPIO_PUPDR_PUPDR0_1 | GPIO_PUPDR_PUPDR1_1 ; // Pull Down
benkatz 1:27b535673eed 255 GPIOA->AFR[0] |= 0x00000011 ; // AF01 for PA0 & PA1
benkatz 1:27b535673eed 256 GPIOA->AFR[1] |= 0x00000000 ; //
benkatz 1:27b535673eed 257
benkatz 0:92d18e011d98 258 // configure TIM2 as Encoder input
benkatz 3:2e9713c61c2d 259 TIM2->DIER = 0x00;
benkatz 3:2e9713c61c2d 260 TIM2->EGR = 0x0;
benkatz 3:2e9713c61c2d 261 NVIC_DisableIRQ(TIM2_IRQn);
benkatz 3:2e9713c61c2d 262
benkatz 1:27b535673eed 263 RCC->APB1ENR |= 0x00000001; // Enable clock for TIM2
benkatz 1:27b535673eed 264 TIM2->CR1 = 0x0001; // CEN(Counter Enable)='1'
benkatz 1:27b535673eed 265 TIM2->SMCR = 0x0003; // SMS='011' (Encoder mode 3)
benkatz 1:27b535673eed 266 TIM2->CCMR1 = 0x5151; // CC1S='01' CC2S='01'
benkatz 1:27b535673eed 267 TIM2->CCMR2 = 0x0000;
benkatz 1:27b535673eed 268 TIM2->CCER = 0x0011; // CC1P CC2P
benkatz 1:27b535673eed 269 TIM2->PSC = 0x0000; // Prescaler = (0+1)
benkatz 1:27b535673eed 270 TIM2->CNT = 0x0000; //reset the counter before we use it
benkatz 3:2e9713c61c2d 271
benkatz 3:2e9713c61c2d 272 TIM2->CR2 = 0x030; //MMS = 101
benkatz 3:2e9713c61c2d 273 __TIM15_CLK_ENABLE();
benkatz 3:2e9713c61c2d 274 TIM15->PSC = 0x03;
benkatz 3:2e9713c61c2d 275 TIM15->SMCR = 0x4; //TS = 010 for ITR2, SMS = 100
benkatz 3:2e9713c61c2d 276 TIM15->CCMR1 = 0x3;// CC1S = 11, IC1 mapped on TRC
benkatz 3:2e9713c61c2d 277 TIM15->CCER |= TIM_CCER_CC1P;
benkatz 3:2e9713c61c2d 278 TIM15->CCER |= TIM_CCER_CC1E;
benkatz 3:2e9713c61c2d 279 TIM15->CR1 = 0x1;
benkatz 3:2e9713c61c2d 280
benkatz 0:92d18e011d98 281 }
benkatz 0:92d18e011d98 282
benkatz 3:2e9713c61c2d 283
benkatz 1:27b535673eed 284 /* Initialize PWM */
benkatz 0:92d18e011d98 285 void InitPWM(void){
benkatz 1:27b535673eed 286 RCC->AHBENR |= RCC_AHBENR_GPIOAEN; // enable the clock to GPIOA
benkatz 1:27b535673eed 287 RCC->AHBENR |= RCC_AHBENR_GPIOBEN; // enable the clock to GPIOB
benkatz 1:27b535673eed 288 RCC->APB2ENR |= RCC_APB2ENR_TIM1EN; // enable TIM1 clock
benkatz 0:92d18e011d98 289
benkatz 0:92d18e011d98 290 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 291 GPIOB->MODER |= GPIO_MODER_MODER0_1; // PB_0 to alternate function mode
benkatz 0:92d18e011d98 292 GPIOA->AFR[0] |= 0x60000000; // PA_7 to alternate function 6
benkatz 0:92d18e011d98 293 GPIOA->AFR[1] |= 0x00000066; // PA_8, PA_9 to alternate function 6
benkatz 0:92d18e011d98 294 GPIOB->AFR[0] |= 0x00000006; // PB_0 to alternate function 6
benkatz 0:92d18e011d98 295
benkatz 0:92d18e011d98 296 //PWM Setup
benkatz 0:92d18e011d98 297 TIM1->CCMR1 |= 0x6060; // Enable output compare 1 and 2
benkatz 0:92d18e011d98 298 TIM1->CCER |= TIM_CCER_CC1E | TIM_CCER_CC1NE | TIM_CCER_CC2NE | TIM_CCER_CC2E; // enable outputs 1, 2, and complementary outputs
benkatz 1:27b535673eed 299 TIM1->BDTR |= TIM_BDTR_MOE | 0xF; // MOE = 1 | set dead-time
benkatz 1:27b535673eed 300 TIM1->PSC = 0x0; // no prescaler, timer counts up in sync with the peripheral clock
benkatz 1:27b535673eed 301 TIM1->ARR = PWM_ARR; // set auto reload
benkatz 1:27b535673eed 302 TIM1->CR1 |= TIM_CR1_ARPE; // autoreload on,
benkatz 1:27b535673eed 303 TIM1->CR1 |= TIM_CR1_CEN; // enable TIM1
benkatz 0:92d18e011d98 304
benkatz 3:2e9713c61c2d 305
benkatz 1:27b535673eed 306 NVIC_EnableIRQ(TIM1_UP_TIM16_IRQn); //Enable TIM1 IRQ
benkatz 1:27b535673eed 307 TIM1->DIER |= TIM_DIER_UIE; // enable update interrupt
benkatz 1:27b535673eed 308 TIM1->CR1 |= 0x40; //CMS = 10, interrupt only when counting up
benkatz 1:27b535673eed 309 TIM1->RCR |= 0x001; // update event once per up/down count of tim1
benkatz 3:2e9713c61c2d 310 TIM1->EGR |= TIM_EGR_UG;
benkatz 3:2e9713c61c2d 311
benkatz 3:2e9713c61c2d 312 }
benkatz 3:2e9713c61c2d 313