File content as of revision 0:500d22d1efeb:

#include "mbed.h"

#define KP 5.8  //Pゲイン
#define CHG 1.0 //change_gray用の係数
#define WHITE_CL 0.88   //初期値
#define WHITE_CR 0.88    //初期値
#define GRAY_CL 0.65    //初期値
#define GRAY_CR 0.65     //初期値
#define GRAY_L 0.26     //初期値
#define GRAY_R 0.25     //初期値

#define DEBUG

DigitalOut ledL( PTB8);
DigitalOut ledR( PTE5);
DigitalOut ledC( PTE2); //動作check
BusOut ledLL( PTB8, PTB9);
BusOut ledRR( PTE4, PTE5);
AnalogIn sensorR( PTB1);
AnalogIn sensorL( PTB3);
AnalogIn sensorCR( PTB0);
AnalogIn sensorCL( PTB2);
//モータ1
BusOut Mlefti(PTA1, PTA2);
PwmOut Mleftp(PTD4);
//モータ2
BusOut Mrighti(PTC0, PTC7);
PwmOut Mrightp(PTA12);

float whiteCL[2], whiteCR[2], grayCL[2], grayCR[2]; //[1]が初期設定の基準値，[0]が変動する閾値
float grayL[2], grayR[2];
float blackCL = 0.12;   //閾値の跡地
float blackCR = 0.3;   //↑と同じ
float whiteL = 0.27, blackL = 0.22;
float whiteR = 0.28, blackR = 0.22;
float sensor[4];    //sensor[0]:sensorL ... sensor[3]:sensorR
float pr, pl;

void stop_point_ver2();

void set_threshold(){   //閾値の初期設定
    for( int i = 0; i < 2; i++){
        whiteCL[i] = WHITE_CL;
        whiteCR[i] = WHITE_CR;
        grayCL[i] = GRAY_CL;
        grayCR[i] = GRAY_CR;
        grayL[i] = GRAY_L;
        grayR[i] = GRAY_R;
    }
}

void go_straight_p(){   //P制御でトレース
    Mrighti = 1;
    Mrightp = (KP * pr) * 1.0f;
    Mlefti = 1;
    Mleftp = (KP * pl) * 1.0f;
    ledR = 1;
    ledL = 1;
}

void go_straight_CR(){  //CRのみでトレース
    Mrighti = 1;
    Mrightp = (KP * pr + 0.3) * 1.0f;
    Mlefti = 1;
    Mleftp = (1.3 - KP * pr) * 1.0f;
    ledRR = 0b11;
    ledLL = 0b10;
}

void turn_right(){
    Mrighti = 2;
    Mrightp = 0.05f;
    Mlefti = 1;
    Mleftp = 0.1f;
    ledR = 1;
    ledL = 0;
}

void turn_left(){
    Mrighti = 1;
    Mrightp = 0.1f;
    Mlefti = 2;
    Mleftp = 0.05f;
    ledR = 0;
    ledL = 1;
}

void turn_right_ver2(){
    while( sensor[0] > grayL[0]){   //sensorL > grayL[0] 
        sensor[0] = sensorL.read();
        turn_right();
    }
    stop_point_ver2();
    while( sensor[2] > grayCR[0]){  //補正
        sensor[2] = sensorCR.read();
        turn_left();
    }
    stop_point_ver2();
}

void turn_left_ver2(){
    while( sensor[3] > grayR[0]){   //sensorR > grayR[0]
        sensor[3] = sensorR.read();
        turn_left();
    }
    stop_point_ver2();
    while( sensor[1] > grayCL[0]){  //補正
        sensor[1] = sensorCL.read();
        turn_right();
    }
    stop_point_ver2();
}

void motor_check(){   //モータドライバの調子の確認用
    Mrighti = 1;
    Mrightp = 1.0f;
    Mlefti = 1;
    Mleftp = 1.0f;
}

void stop_point(){
    Mrighti = 2;
    Mrightp = 1.0f;
    Mlefti = 2;
    Mleftp = 1.0f;
    wait(0.05);
    Mrighti = 0;
    Mlefti = 0;
    ledRR = 0b11;
    ledLL = 0b11;
}

void stop_point_ver2(){
    if( Mrighti == 1)
        Mrighti = 2;
    else if( Mrighti == 2)
        Mrighti = 1;
    Mrightp = 1.0f;
    if( Mlefti == 1)
        Mlefti = 2;
    else if( Mlefti == 2)
        Mlefti = 1;
    Mleftp = 1.0f;
    wait(0.05);
    Mrighti = 0;
    Mlefti = 0;
    ledRR = 0b11;
    ledLL = 0b11;
}

void change_gray(){
    if( sensor[1] <= grayCL[0]){    //sensorCL <=grayCL
        whiteCR[0] = sensorCR.read();
        grayCR[0] = grayCR[1] * ( 1 + CHG * (whiteCR[1] - whiteCR[0]) / whiteCR[1]);
        grayCL[0] = grayCL[1] * ( 1 + CHG * (whiteCR[1] - whiteCR[0]) / whiteCR[1]);
        grayR[0] = grayR[1] * ( 1 + CHG * (whiteCR[1] - whiteCR[0]) / whiteCR[1]);
        grayL[0] = grayL[1] * ( 1 + CHG * (whiteCR[1] - whiteCR[0]) / whiteCR[1]);
        ledRR = 0b10;
        ledLL = 0;
    }
    else if( sensor[2] <= grayCR[0]){   //sensorCR <= grayCR
        whiteCL[0] = sensorCL.read();
        grayCR[0] = grayCR[1] * ( 1 + CHG * (whiteCL[1] - whiteCL[0]) / whiteCL[1]);
        grayCL[0] = grayCL[1] * ( 1 + CHG * (whiteCL[1] - whiteCL[0]) / whiteCL[1]);
        grayR[0] = grayR[1] * ( 1 + CHG * (whiteCL[1] - whiteCL[0]) / whiteCL[1]);
        grayL[0] = grayL[1] * ( 1 + CHG * (whiteCL[1] - whiteCL[0]) / whiteCL[1]);
        ledRR = 0;
        ledLL = 0b10;
    }
}

int main() {
    ledC = 1;
    set_threshold();
    motor_check();
    wait(0.5);
    while(1) {
        sensor[0] = sensorL.read();
        sensor[1] = sensorCL.read();
        sensor[2] = sensorCR.read();
        sensor[3] = sensorR.read();

        pl = (sensor[1] - grayCL[0]) / (whiteCL[0] - grayCL[0]);
        pr = (sensor[2] - grayCR[0]) / (whiteCR[0] - grayCR[0]);
        
        if( sensor[0] <= grayL[0]){
            turn_left_ver2();
            change_gray();
            #ifdef DEBUG
                break;
            #endif
        } else if( sensor[3] <= grayR[0]){
            turn_right_ver2();
            change_gray();
            #ifdef DEBUG
                break;
            #endif
        } else
            go_straight_p();
        if( sensor[0] < blackL && sensor[3] < blackR){
            stop_point_ver2();
            break;
        }
    }
}