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Dependencies:   FastPWM3 mbed

Fork of foc-ed_in_the_bot_compact by Bayley Wang

PositionSensor/PositionSensor.cpp@5:efd3838b79a6, 2016-03-27 (annotated)

Committer:
bwang
Date:
Sun Mar 27 03:40:52 2016 +0000
Revision:
5:efd3838b79a6
Parent:
2:eabe8feaaabb 
broken emrax code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bwang 0:bac9c3a3a6ca 1
bwang 0:bac9c3a3a6ca 2 #include "mbed.h"
bwang 0:bac9c3a3a6ca 3 #include "PositionSensor.h"
bwang 5:efd3838b79a6 4 #include "config.h"
bwang 0:bac9c3a3a6ca 5 #include <math.h>
bwang 0:bac9c3a3a6ca 6
bwang 0:bac9c3a3a6ca 7 /*
bwang 0:bac9c3a3a6ca 8 * CPR: counts per revolution (4x lines per revolution)
bwang 0:bac9c3a3a6ca 9 * offset: mechanical position offset in radians
bwang 0:bac9c3a3a6ca 10 */
bwang 0:bac9c3a3a6ca 11
bwang 5:efd3838b79a6 12 PositionSensorEncoder::PositionSensorEncoder(int cpr, float offset) {
bwang 5:efd3838b79a6 13 _CPR = cpr;
bwang 0:bac9c3a3a6ca 14 _offset = offset;
bwang 0:bac9c3a3a6ca 15
bwang 0:bac9c3a3a6ca 16 __GPIOA_CLK_ENABLE();
bwang 0:bac9c3a3a6ca 17 __GPIOB_CLK_ENABLE();
bwang 0:bac9c3a3a6ca 18
bwang 0:bac9c3a3a6ca 19 GPIOB->MODER |= GPIO_MODER_MODER3_1;
bwang 0:bac9c3a3a6ca 20 GPIOB->OTYPER |= GPIO_OTYPER_OT_3 | GPIO_OTYPER_OT_10 ;
bwang 0:bac9c3a3a6ca 21 GPIOB->OSPEEDR |= GPIO_OSPEEDER_OSPEEDR3 | GPIO_OSPEEDER_OSPEEDR10 ;
bwang 0:bac9c3a3a6ca 22 GPIOB->AFR[0] |= 0x00001000 ;
bwang 0:bac9c3a3a6ca 23
bwang 0:bac9c3a3a6ca 24 GPIOA->MODER |= GPIO_MODER_MODER15_1;
bwang 0:bac9c3a3a6ca 25 GPIOA->OTYPER |= GPIO_OTYPER_OT_15;
bwang 0:bac9c3a3a6ca 26 GPIOA->OSPEEDR |= GPIO_OSPEEDER_OSPEEDR15;
bwang 0:bac9c3a3a6ca 27 GPIOA->AFR[1] |= 0x10000000 ;
bwang 0:bac9c3a3a6ca 28
bwang 0:bac9c3a3a6ca 29 __TIM2_CLK_ENABLE();
bwang 0:bac9c3a3a6ca 30
bwang 0:bac9c3a3a6ca 31 TIM2->CR1 = 0x0001;
bwang 0:bac9c3a3a6ca 32 TIM2->SMCR = TIM_ENCODERMODE_TI12;
bwang 0:bac9c3a3a6ca 33 TIM2->CCMR1 = 0xf1f1;
bwang 0:bac9c3a3a6ca 34 TIM2->CCMR2 = 0x0000;
bwang 0:bac9c3a3a6ca 35 TIM2->CCER = 0x0011;
bwang 0:bac9c3a3a6ca 36 TIM2->PSC = 0x0000;
bwang 0:bac9c3a3a6ca 37 TIM2->ARR = 0xffffffff;
bwang 0:bac9c3a3a6ca 38
bwang 0:bac9c3a3a6ca 39 TIM2->CNT = 0;
bwang 0:bac9c3a3a6ca 40
bwang 0:bac9c3a3a6ca 41 ZPulse = new InterruptIn(PB_12);
bwang 0:bac9c3a3a6ca 42 ZSense = new DigitalIn(PB_12);
bwang 0:bac9c3a3a6ca 43 ZPulse->enable_irq();
bwang 0:bac9c3a3a6ca 44 ZPulse->rise(this, &PositionSensorEncoder::ZeroEncoderCount);
bwang 0:bac9c3a3a6ca 45 ZPulse->mode(PullDown);
bwang 0:bac9c3a3a6ca 46
bwang 0:bac9c3a3a6ca 47 ZTest = new DigitalOut(PC_10);
bwang 0:bac9c3a3a6ca 48 ZTest->write(1);
bwang 0:bac9c3a3a6ca 49 state = 0;
bwang 0:bac9c3a3a6ca 50 }
bwang 0:bac9c3a3a6ca 51
bwang 0:bac9c3a3a6ca 52 /*
bwang 0:bac9c3a3a6ca 53 * Returns mechanical position in radians
bwang 0:bac9c3a3a6ca 54 */
bwang 0:bac9c3a3a6ca 55
bwang 0:bac9c3a3a6ca 56 float PositionSensorEncoder::GetMechPosition() {
bwang 0:bac9c3a3a6ca 57 int raw = TIM2->CNT;
bwang 0:bac9c3a3a6ca 58 if (raw < 0) raw += _CPR;
bwang 0:bac9c3a3a6ca 59 if (raw >= _CPR) raw -= _CPR;
bwang 0:bac9c3a3a6ca 60 float signed_elec = fmod((1.0f * (6.28318530718f * (raw) / (float)_CPR + _offset)), 6.28318530718f);
bwang 0:bac9c3a3a6ca 61 if (signed_elec < 0){
bwang 0:bac9c3a3a6ca 62 return signed_elec + 6.28318530718f;
bwang 0:bac9c3a3a6ca 63 }
bwang 0:bac9c3a3a6ca 64 else{
bwang 0:bac9c3a3a6ca 65 return signed_elec;
bwang 0:bac9c3a3a6ca 66 }
bwang 0:bac9c3a3a6ca 67 }
bwang 0:bac9c3a3a6ca 68
bwang 0:bac9c3a3a6ca 69 /*
bwang 0:bac9c3a3a6ca 70 * Returns electrical position in radians
bwang 0:bac9c3a3a6ca 71 */
bwang 0:bac9c3a3a6ca 72
bwang 0:bac9c3a3a6ca 73 float PositionSensorEncoder::GetElecPosition() {
bwang 0:bac9c3a3a6ca 74 int raw = TIM2->CNT;
bwang 0:bac9c3a3a6ca 75 if (raw < 0) raw += _CPR;
bwang 0:bac9c3a3a6ca 76 if (raw >= _CPR) raw -= _CPR;
bwang 5:efd3838b79a6 77 float signed_elec = fmod((POLE_PAIRS / RESOLVER_LOBES * (6.28318530718f * (raw) / (float)_CPR + _offset)), 6.28318530718f);
bwang 0:bac9c3a3a6ca 78 if (signed_elec < 0) {
bwang 0:bac9c3a3a6ca 79 return signed_elec + 6.28318530718f;
bwang 0:bac9c3a3a6ca 80 } else {
bwang 0:bac9c3a3a6ca 81 return signed_elec;
bwang 0:bac9c3a3a6ca 82 }
bwang 0:bac9c3a3a6ca 83 }
bwang 0:bac9c3a3a6ca 84
bwang 0:bac9c3a3a6ca 85 void PositionSensorEncoder::ZeroEncoderCount(void){
bwang 0:bac9c3a3a6ca 86 if (ZSense->read() == 1){
bwang 0:bac9c3a3a6ca 87 if (ZSense->read() == 1){
bwang 0:bac9c3a3a6ca 88 TIM2->CNT=0;
bwang 0:bac9c3a3a6ca 89 }
bwang 0:bac9c3a3a6ca 90 }
bwang 0:bac9c3a3a6ca 91 }