AMiRo-OS

#include "userthread.h"

#include "global.hpp"

#include <array>

using namespace amiro;

extern Global global;

uint16_t touch;

std::array<uint16_t, 8> proximity;

std::array<float, 8> proxNormalized;

bool running;

uint16_t constexpr proxThresholdLow = 0x0000;

uint16_t constexpr proxThresholdHigh = 0x2000;

uint16_t constexpr proxRange = proxThresholdHigh - proxThresholdLow;

std::array< std::array<float, 2>, 8> constexpr namMatrix = {

    /*                              x     w_z */

    std::array<float, 2>/* SSW */{ 0.00f,  0.00f},

    std::array<float, 2>/* WSW */{ 0.25f, -0.25f},

    std::array<float, 2>/* WNW */{-0.75f, -0.50f},

    std::array<float, 2>/* NNW */{-0.75f, -1.00f},

    std::array<float, 2>/* NNE */{-0.75f,  1.00f},

    std::array<float, 2>/* ENE */{-0.75f,  0.50f},

    std::array<float, 2>/* ESE */{ 0.25f,  0.25f},

    std::array<float, 2>/* SSE */{ 0.00f,  0.00f}

};

uint32_t constexpr baseTranslation = 50e3; // 2cm/s

uint32_t constexpr baseRotation = 1e6; // 1rad/s

types::kinematic constexpr defaultKinematic = {

    /*  x  [µm/s]   */ baseTranslation,

    /*  y  [µm/s]   */ 0,

    /*  z  [µm/s]   */ 0,

    /* w_x [µrad/s] */ 0,

    /* w_y [µrad/s] */ 0,

    /* w_z [µrad/s] */ 0

};

inline uint8_t ProxId2LedId(const uint8_t proxId) {

    return (proxId < 4) ? proxId+4 : proxId-4;

}

Color Prox2Color(const float prox) {

  float p = 0.0f;

  if (prox < 0.5f) {

    p = 2.0f * prox;

    return Color(0x00, p*0xFF, (1.0f-p)*0xFF);

  } else {

    p = 2.0f * (prox - 0.5f);

    return Color(p*0xFF, (1.0f-p)*0xFF, 0x00);

  }

}

UserThread::UserThread() :

  chibios_rt::BaseStaticThread<USER_THREAD_STACK_SIZE>()

{

}

UserThread::~UserThread()

{

}

msg_t

UserThread::main()

{

    uint8_t sensor = 0;

    float factor_x = 0.0f;

    float factor_wz = 0.0f;

    types::kinematic kinematic = defaultKinematic;

    for (uint8_t led = 0; led < 8; ++led) {

      global.robot.setLightColor(led, Color(Color::BLACK));

    }

    running = false;

    while (!this->shouldTerminate())

    {

        /*

         * read touch sensor values

         */

        touch = global.mpr121.getButtonStatus();

        /*

         * evaluate touch input

         */

        if (touch == 0x0F) {

            if (running) {

                // stop the robot

                running = false;

                kinematic = {0, 0, 0, 0, 0, 0};

                global.robot.setTargetSpeed(kinematic);

            } else {

                // start the robot

                running = true;

            }

            // set all LEDs to white for one second

            for (uint8_t led = 0; led < 8; ++led) {

                global.robot.setLightColor(led, Color(Color::WHITE));

            }

            this->sleep(MS2ST(1000));

            for (uint8_t led = 0; led < 8; ++led) {

                global.robot.setLightColor(led, Color(Color::BLACK));

            }

        }

        if (running) {

            /*

             * read proximity values

             */

            for (sensor = 0; sensor < 8; ++sensor) {

                proximity[sensor] = global.vcnl4020[sensor].getProximityScaledWoOffset();

                //proxNormalized[sensor] += 2.0f * (proxNormalized[sensor] * (1.0f - proxNormalized[sensor])); // non linearity

            }

            /*

             * normalize proximity values

             */

            for (sensor = 0; sensor < 8; ++sensor) {

                register uint16_t prox = proximity[sensor];

                // limit to high treshold

                if (prox > proxThresholdHigh)

                    prox = proxThresholdHigh;

                // limit to low threshold

                else if (prox < proxThresholdLow)

                    prox = proxThresholdLow;

                // apply low threshold

                prox -= proxThresholdLow;

                // normalize to [0, 1]

                proxNormalized[sensor] = float(prox) / float(proxRange);

            }

            /*

             * map the sensor values to the top LEDs

             */

            for (sensor = 0; sensor < 8; ++sensor) {

                global.robot.setLightColor(ProxId2LedId(sensor), Prox2Color(proxNormalized[sensor]));

            }

            /*

             * evaluate NAM

             */

            factor_x = 0.0f;

            factor_wz = 0.0f;

            for (sensor = 0; sensor < 8; ++sensor) {

                factor_x += proxNormalized[sensor] * namMatrix[sensor][0];

                factor_wz += proxNormalized[sensor] * namMatrix[sensor][1];

            }

            /*

             * set motor commands

             */

            kinematic = defaultKinematic;

            kinematic.x += (factor_x * baseTranslation) + 0.5f;

            kinematic.w_z += (factor_wz * baseRotation) + 0.5f;

            global.robot.setTargetSpeed(kinematic);

        }

        this->sleep(MS2ST(100));

    }

  return RDY_OK;

}