File content as of revision 7:aac5f901bd76:

#include "mbed.h"
#include "RobotLeg.h"
#include "Matrix.h"
#include "CircularBuffer.h"
#include "Radio.h"
#include "Terminal.h"
#include <cstring>
#include <cmath>

#define MAXSPEED 0.1f
#define MAXTURN 1.0f
#define STEPTIME 0.4f

enum state_t
{
    walk,
    step,
    reset
};

enum legstate_t
{
    A,
    B,
    C,
    D
};

CircularBuffer<float,16> dataLog;
RobotLeg legA(p26, p29, p30);
RobotLeg legB(p13, p14, p15);
RobotLeg legC(p12, p11, p8);
RobotLeg legD(p23, p24, p25);
Radio radio(p5, p6, p7, p19, p20, p17);
Timer cycleTimer;
state_t state;
legstate_t legState;



CmdHandler* log(Terminal* terminal, const char* input)
{
    int start = 0;
    int end = 15;
    char output[256];
    
    if (sscanf(input, "log %d %d", &start, &end) == 1)
    {
        // Print only one item
        sprintf(output, "%4d: %f\n", start, dataLog[start]);
        terminal->write(output);
    }
    else
    {
        // Print a range of items
        for (int i = start; i <= end; i++)
        {
            sprintf(output, "%4d: %f\n", i, dataLog[i]);
            terminal->write(output);
        }
    }  
    
    return NULL;
}



CmdHandler* read(Terminal* terminal, const char* input)
{
    char output[256];
    uint32_t data;

    data = radio.rx_controller;
    sprintf(output, "%d%d%d%d%d%d%d%d %d%d%d%d%d%d%d%d %d%d%d%d%d%d%d%d %d%d%d%d%d%d%d%d : %4d %4d %4d %4d", 
    (data>>31)&1, (data>>30)&1, (data>>29)&1, (data>>28)&1, (data>>27)&1, (data>>26)&1, (data>>25)&1, (data>>24)&1, 
    (data>>23)&1, (data>>22)&1, (data>>21)&1, (data>>20)&1, (data>>19)&1, (data>>18)&1, (data>>17)&1, (data>>16)&1, 
    (data>>15)&1, (data>>14)&1, (data>>13)&1, (data>>12)&1, (data>>11)&1, (data>>10)&1, (data>>9)&1, (data>>8)&1, 
    (data>>7)&1, (data>>6)&1, (data>>5)&1, (data>>4)&1, (data>>3)&1, (data>>2)&1, (data>>1)&1, (data>>0)&1, 
    (int8_t)((data>>24)&0xff), (int8_t)((data>>16)&0xff), (int8_t)((data>>8)&0xff), (int8_t)((data)&0xff));
    terminal->write(output);

    return NULL;
}



int deadzone(int input, int zone)
{
    if (input > zone) return input;
    else if (input < -zone) return input;
    else return 0;
}



void resetLegs()
{
    legA.reset(-0.5f);
    legB.reset(0.0f);
    legC.reset(0.5f);
    legD.reset(1.0f);
    cycleTimer.start();
    state = reset;
    legState = D;
}



int main()
{
    Timer deltaTimer;
    float xaxis, yaxis, turnaxis, speed, angle;
    vector3 v;
    matrix4 T;
    matrix4 PA, QA;
    matrix4 PB, QB; 
    matrix4 PC, QC; 
    matrix4 PD, QD;
    Terminal terminal;
    bool freeA, freeB, freeC, freeD;
    
    terminal.addCommand("log", &log);
    terminal.addCommand("read", &read);
    
    radio.reset();
    
    // Set leg parameters
    legA.setDimensions(0.125f, 0.11f, 0.0025f, 0.025f);
    legB.setDimensions(0.125f, 0.11f, 0.0025f, 0.025f);
    legC.setDimensions(0.125f, 0.11f, 0.0025f, 0.025f);
    legD.setDimensions(0.125f, 0.11f, 0.0025f, 0.025f);
    legA.setAngleOffsets(0.7853982f, 0.0f, 0.0f);
    legB.setAngleOffsets(0.7853982f, 0.0f, 0.0f);
    legC.setAngleOffsets(0.7853982f, 0.0f, 0.0f);
    legD.setAngleOffsets(0.7853982f, 0.0f, 0.0f);
    legA.setStepCircle(0.095f, 0.095f, -0.12f, 0.09f);
    legB.setStepCircle(0.095f, 0.095f, -0.12f, 0.09f);
    legC.setStepCircle(0.095f, 0.095f, -0.12f, 0.09f);
    legD.setStepCircle(0.095f, 0.095f, -0.12f, 0.09f);
    legA.theta.calibrate(1000, 2000, 45.0f, -45.0f);
    legA.phi.calibrate(1000, 2000, 70.0f, -45.0f);
    legA.psi.calibrate(2000, 1000, 70.0f, -60.0f);
    legB.theta.calibrate(1000, 2000, 45.0f, -45.0f);
    legB.phi.calibrate(1000, 2000, 70.0f, -45.0f);
    legB.psi.calibrate(2000, 1000, 70.0f, -60.0f);
    legC.theta.calibrate(2000, 1000, 45.0f, -45.0f);
    legC.phi.calibrate(2000, 1000, 70.0f, -45.0f);
    legC.psi.calibrate(1000, 2000, 70.0f, -60.0f);
    legD.theta.calibrate(2000, 1000, 45.0f, -45.0f);
    legD.phi.calibrate(2000, 1000, 70.0f, -45.0f);
    legD.psi.calibrate(1000, 2000, 70.0f, -60.0f);
    
    // Initialize leg position deltas
    legA.nDeltaPosition = vector3(0.0f, 0.01f, 0.0f);
    legB.nDeltaPosition = vector3(0.0f, -0.01f, 0.0f);
    legC.nDeltaPosition = vector3(0.0f, 0.01f, 0.0f);
    legD.nDeltaPosition = vector3(0.0f, -0.01f, 0.0f);

    // Create matrices to change base from robot coordinates to leg coordinates
    QA.translate(vector3(0.1f, 0.1f, 0.0f));
    PA = QA.inverse();
    QB.translate(vector3(-0.1f, -0.1f, 0.0f));
    QB.a11 = -1.0f; QB.a22 = -1.0f;
    PB = QB.inverse();
    QC.translate(vector3(0.1f, -0.1f, 0.0f));
    QC.a11 = -1.0f;
    PC = QC.inverse();
    QD.translate(vector3(-0.1f, 0.1f, 0.0f));
    QD.a22 = -1.0f;
    PD = QD.inverse();

    // Go to initial position
    resetLegs();
    
    deltaTimer.start();
    
    /*
    // Dump debug info 
    sprintf(output, "T =\t%f\t%f\t%f\t%f\n\t%f\t%f\t%f\t%f\n\t%f\t%f\t%f\t%f\n\t0\t\t0\t\t0\t\t1\n",
            T.a11, T.a12, T.a13, T.a14,
            T.a21, T.a22, T.a23, T.a24,
            T.a31, T.a32, T.a33, T.a34);
    terminal.write(output); */
    
    
    while(true)
    {
        switch (state)
        {
        case walk:
        case step:
            // Read controller input
            xaxis = 0.0078125f * deadzone((int8_t)((radio.rx_controller>>0)&0xff), 8); // Convert to +/-1.0f range
            yaxis = -0.0078125f * deadzone((int8_t)((radio.rx_controller>>8)&0xff), 8);
            turnaxis = -0.0078125f * deadzone((int8_t)((radio.rx_controller>>16)&0xff), 8);
            
            // Compute delta movement vector and delta angle
            v.x = xaxis;
            v.y = yaxis;
            v.z = 0;
            v = v * MAXSPEED * deltaTimer.read();
            speed = sqrt(v.x*v.x + v.y*v.y);
            angle = turnaxis * MAXTURN * deltaTimer.read();
            dataLog.push(turnaxis);
            deltaTimer.reset();
            
            // Compute movement transformation in robot coordinates
            T.identity().rotateZ(angle).translate(v).inverse();
            
            // Update legs
            freeA = legA.update(PA*T*QA);
            freeB = legB.update(PB*T*QB);
            freeC = legC.update(PC*T*QC);
            freeD = legD.update(PD*T*QD);
            
            // Update state
            switch (legState)
            {
            case A:
                if (!freeB || !freeC || !freeD) resetLegs();
                else if (!freeA || cycleTimer.read() > 0.055f / speed) // 0.055/speed is 1/4 the gait period (0.22m/speed/4)
                {
                    legA.reset(1.0f);
                    legState = B;
                }
                break;
            
            case B:
                if (!freeA || !freeC || !freeD) resetLegs();
                else if (!freeB || cycleTimer.read() > 0.11f / speed)
                {
                    legB.reset(1.0f);
                    legState = C;
                }
                break;
            
            case C:
                if (!freeA || !freeB || !freeD) resetLegs();
                else if (!freeC || cycleTimer.read() > 0.165f / speed)
                {
                    legC.reset(1.0f);
                    legState = D;
                }
                break;
            
            case D:
                if (!freeA || !freeB || !freeC) resetLegs();
                else if (!freeD || cycleTimer.read() > 0.22f / speed)
                {
                    legD.reset(1.0f);
                    legState = A;
                    cycleTimer.reset();
                }
                break;
            }
            
            break; // case walk:, case step:
            
        case reset:
            if (cycleTimer.read() < STEPTIME && legState != A)
            {
                legA.reset(-0.5f);
                legState = A;
            }
            else if (cycleTimer.read() < STEPTIME * 2 && legState == A)
            {
                legB.reset(0.0f);
                legState = B;
            }
            else if (cycleTimer.read() < STEPTIME * 3 && legState == B)
            {
                legC.reset(0.5f);
                legState = C;
            }
            else if (cycleTimer.read() < STEPTIME * 4 && legState == C)
            {
                legD.reset(1.0f);
                legState = D;
            }
            else if (cycleTimer.read() >= STEPTIME * 4 && legState == D)
            {
                state = walk;
                legState = A;
                cycleTimer.reset();
            }
            else
            {
                resetLegs();
            }
            
            break; // case reset:
        } // switch (state)
    } // while (true)
} // main()