/*
 Zadani: regulujte hlasitost radia a hlasitost zobrazujte na ledkach
         PS. trochu jsem posteloval radio stanici na Radio Beat, coz tento obvod asi nezachyti
             kazdopadne lze slyset sumeni
         Spousta kodu je preddefinovaneho Panem Olivkou
 */

#include <mbed.h>

#include "i2c-lib.h"
#include "si4735-lib.h"

//************************************************************************

// Direction of I2C communication
#define R   0b00000001
#define W   0b00000000

Serial pc( USBTX, USBRX );

////////////////////////////////////////
// VLASTNI DEKLARACE - ZBYTEK PREDNASTAVENY
////////////////////////////////////////
DigitalIn but9( PTC9 ); // Leve tlacitko pro snizovani VOLUME
DigitalIn but10( PTC10 ); // prave tlacitko pro zvysovani VOLUME

bool but9Pressed = false; // pomocne prommene aby tlacitko nemohlo byt drzeno
bool but10Pressed = false;

int actualVolume = 30; // nastaveni aktualniho volume
int setVolumeRange = 5; // skok jakym se ma pricitat volume, MAX je 63
uint8_t ack = 0;
////////////////////////////////////////
////////////////////////////////////////

#pragma GCC diagnostic ignored "-Wunused-but-set-variable"

void setVolume(int vol){ // krome radku ack |= I2C_Output(vol); je cela f-ce preddefinovana v dokumentaci
                         // hlavne ty adresy 0x12, 0x00, apod..

    I2C_Start();

    ack |= I2C_Output( SI4735_address | W );
    ack |= I2C_Output( 0x12 );
    ack |= I2C_Output( 0x00 );
    ack |= I2C_Output( 0x40 );
    ack |= I2C_Output( 0x00 );
    ack |= I2C_Output( 0x00 );
    ack |= I2C_Output(vol);

    I2C_Stop();
    wait_ms(100);

    return;

}

void setLeds(int vol){

    I2C_Start();

    ack = I2C_Output( 0b01000000 | 0b00001110 | W ); //prvnĂ­ ÄŤĂ­slo nevim co je,
    // druhé je na takove čudličky male co tam jsou a když jsou všechny dole tak to jsou ty 3 jedničky 00001110 a pak W je zápis

    if ( ack != 0 )
        pc.printf("Nastala chyba v komunikaci\n");

    // podle toho jaky je nastaveny Volume tak rozsvit patricne ledky
    if (vol <= 8){
        I2C_Output( 0b000000001); // 0 - nesviti, 1 - sviti
    }
    if (vol > 8 && vol <= 16){
        I2C_Output( 0b000000011);
    }
    if (vol > 16 && vol <= 24){
        I2C_Output( 0b000000111);
    }
    if (vol > 24 && vol <= 32){
        I2C_Output( 0b000001111);
    }
    if (vol > 32 && vol <= 40){
        I2C_Output( 0b000011111);
    }
    if (vol > 40 && vol <= 48){
        I2C_Output( 0b000111111);
    }
    if (vol > 48 && vol <= 56){
        I2C_Output( 0b001111111);
    }
    if (vol > 56){
        I2C_Output( 0b111111111);
    }

    I2C_Stop();

}

int main( void )
{
    uint8_t S1, S2, RSSI, SNR, MULT, CAP;

    I2C_Init();

    pc.baud( 115200 );
    pc.printf( "K64F-KIT ready...\r\n" );

    // communication with 8 bit expander PCF8574

    // start communication
    I2C_Start();

    // PCF8574 addressing
    // The address is composed from 3 parts!
    //ack = I2C_Output( HWADR_PCF8574 | A012 | W );
    //ack = I2C_Output( 0b01000000 | 0b00001110 | W );

    // Check ack! Return value must be 0!
    // ....

    if ( ack != 0 )
        pc.printf("Nastala chyba v komunikaci\n");

    //I2C_Output( 0b010101010);
    //ack = I2C_Output( 0b0000001 );
    // selected LEDs should light

    // stop communication
    I2C_Stop();

    if ( ( ack = SI4735_Init() ) != 0 )
    {
        pc.printf( "Initialization of SI4735 finish with error (%d)\r\n", ack );
        return 0;
    }
    else
        pc.printf( "SI4735 initialized.\r\n" );

    pc.printf( "\nTunig of radio station...\r\n" );

    // Required frequency in MHz * 100
    int freq = 9050; // Radiozurnal

    // Tuning of radio station
    I2C_Start();
    ack |= I2C_Output( SI4735_address | W );
    ack |= I2C_Output( 0x20 );          // FM_TUNE_FREQ
    ack |= I2C_Output( 0x00 );          // ARG1
    ack |= I2C_Output( freq >> 8 );     // ARG2 - FreqHi
    ack |= I2C_Output( freq & 0xff );   // ARG3 - FreqLo
    ack |= I2C_Output( 0x00 );          // ARG4
    I2C_Stop();
    // Check ack!
    // if...

    // Tuning process inside SI4735
    wait_ms( 100 );
    printf( "... station tuned.\r\n\n" );

    // Example of reading of tuned frequency
    I2C_Start();
    ack |= I2C_Output( SI4735_address | W );
    ack |= I2C_Output( 0x22 );          // FM_TUNE_STATUS
    ack |= I2C_Output( 0x00 );          // ARG1
    // repeated start
    I2C_Start();
    // change direction of communication
    ack |= I2C_Output( SI4735_address | R );
    // read data
    S1 = I2C_Input();
    I2C_Ack();
    S2 = I2C_Input();
    I2C_Ack();
    freq = (int) I2C_Input() << 8;
    I2C_Ack();
    freq |= I2C_Input();
    I2C_Ack();
    RSSI = I2C_Input();
    I2C_Ack();
    SNR = I2C_Input();
    I2C_Ack();
    MULT = I2C_Input();
    I2C_Ack();
    CAP = I2C_Input();
    I2C_NAck();
    I2C_Stop();


    // Az tady je cela f-ce Main preddefinovana!!
    /////////////////////////////////////////////////////////
    // Tady zacina vlastni kod, ale pouze WHILE
    while(true){

        if (!but9 && !but9Pressed){ // klasika - zkontroluj zda-li bylo stiskle tlacitko
            if (actualVolume > 0) // kontroly jestli nebyla presahnuta hodnota
                actualVolume -= setVolumeRange; // jinak sniz VOLUME
            if (actualVolume < 0) // pro jistotu kdyby byla presahnuta tak ji nastav na defaultni
                actualVolume = 0;
            but9Pressed = true; // pomocna promenna aby tlacitko nemohlo byt drzeno
        }
        if (but9) but9Pressed = false;

        if (!but10 && !but10Pressed){ // to same akorat pri zvysovani hlasitosti
            if (actualVolume < 63)
                actualVolume += setVolumeRange;
            if (actualVolume > 63)
                actualVolume = 63;
            but10Pressed = true;
        }
        if (but10) but10Pressed = false;

        // po skonceni vsech kontrol tlacitek zavolej f-ce ktere provedou zmeny,
        // tj. zvys/sniz hlasitost, pripadne ukaz to na ledkach
        setVolume( actualVolume );
        setLeds( actualVolume );

    }

    if ( ack != 0 )
        printf( "Communication error!\r\n" );
    else
        printf( "Current tuned frequency: %d.%dMHz\r\n", freq / 100, freq % 100 );

    return 0;
}