// ***********************************************************************
//
// Demo program pro vyuku predmetu APPS (09/2014)
// Petr Olivka, katedra informatiky, FEI, VSB-TU Ostrava
// email:petr.olivka@vsb.cz
//
// Priklad pouzit vyvojoveho nastroje AVR-KIT:
// Ovladani zarizeni na sbernici
//
// ***********************************************************************

// nejprve hlavickovy soubor AVR-KITu
#include "../avrkit/avrkit.h"
#include "i2c-lib.h"
#include "si4735-lib.h"

#include <stdio.h>
#include <avr/io.h>

// Funkce pro ovladani sbernice I2C, kopie z i2c-lib.h

// inicializace sbernice
void I2C_Init( void );

// oznameni zacatku komunikace
void I2C_Start( void );

// oznameni ukonceni komunikace
void I2C_Stop( void );

// odeslani potvrzovaci bitu ACK
void I2C_Ack( void );

// odeslani potvrzovaciho bitu NACK
void I2C_NAck( void );

// prijem potvrzovaciho bitu
char I2C_getACK( void );

// odeslani 8 bitove hodnoty, vraci ACK
char I2C_Vystup( unsigned char value );

// precteni 8 bitove hodnoty
unsigned char I2C_Vstup( void );

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

#define R   0b00000001
#define W   0b00000000
#define PCF8574 0b01001110

#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
int main( void )
{
    char S1, S2, RSSI, SNR, MULT, CAP;
    char ack = 0;

    // inicializace prostredi
    avrkit_init();
    I2C_Init();

    printf( "AVR-KIT ready...\n\n" );
/*
    // komunikace s 8 bitovym expanderem
    // zacatek komunikace
    I2C_Start();
    // adresovani registru PCF8574
    // adresa se sklada ze 3 casti!
    ack = I2C_Vystup( PFC8574 | W);
    // kontrola ack, navratova hodnota musi byt 0!
    if(ack){
        printf("Chyba inicializace");
        return 0;
    }
    // zapis 8 bitu do registru
    I2C_Vystup(0b00101010);
    // nyni sviti pozadovane LED
    // konec komunikace
    I2C_Stop();
    I2C_Start();
    ack = I2C_Vystup( PFC8574 | R);
    if(ack){
        printf("Chyba inicializace");
        return 0;
    }
    printf("Zapsana hodnota %d",I2C_Vstup());
    I2C_Stop();
*/

    if ( ( ack = SI4735_Init() ) != 0 )
    {
        printf( "Chyba (%d) inicializace obvodu SI4735\n", ack );
        return 0;
    }
    else
        printf( "Obvod SI4735 inicializovan.\n" );

    printf( "\nLadeni stanice...\n" );
    int freq = 9370;
    int hlasitost = 30;
    I2C_Start();
    ack |= I2C_Vystup( SI4735_address | W );
    ack |= I2C_Vystup( 0x20 );          // FM_TUNE_FREQ
    ack |= I2C_Vystup( 0x00 );          // ARG1
    ack |= I2C_Vystup( freq >> 8 );     // ARG2 - FreqHi
    ack |= I2C_Vystup( freq & 0xff );   // ARG3 - FreqLo
    ack |= I2C_Vystup( 0x00 );          // ARG4
    I2C_Stop();
    while(1){
        if(~read_butt()&0b00010000){
            freq-=5;
            I2C_Start();
            ack |= I2C_Vystup( SI4735_address | W );
            ack |= I2C_Vystup( 0x20 );          // FM_TUNE_FREQ
            ack |= I2C_Vystup( 0x00 );          // ARG1
            ack |= I2C_Vystup( freq >> 8 );     // ARG2 - FreqHi
            ack |= I2C_Vystup( freq & 0xff );   // ARG3 - FreqLo
            ack |= I2C_Vystup( 0x00 );          // ARG4
            I2C_Stop();
            }
        if(~read_butt()&0b00100000){
            freq+=5;
            I2C_Start();
            ack |= I2C_Vystup( SI4735_address | W );
            ack |= I2C_Vystup( 0x20 );          // FM_TUNE_FREQ
            ack |= I2C_Vystup( 0x00 );          // ARG1
            ack |= I2C_Vystup( freq >> 8 );     // ARG2 - FreqHi
            ack |= I2C_Vystup( freq & 0xff );   // ARG3 - FreqLo
            ack |= I2C_Vystup( 0x00 );          // ARG4
            I2C_Stop();}
        if(read_butt()&0b01000000){
            hlasitost-=2;
            I2C_Start();
            ack |= I2C_Vystup(SI4735_address | W);
            ack |= I2C_Vystup(0x12);
            ack |= I2C_Vystup(0x00);
            ack |= I2C_Vystup(0x40);
            ack |= I2C_Vystup(0x00);
            ack |= I2C_Vystup(0x00);
            ack |= I2C_Vystup(hlasitost);
            I2C_Stop();
        }
        if(read_butt()&0b10000000){
            hlasitost+=2;
            I2C_Start();
            ack |= I2C_Vystup(SI4735_address | W);
            ack |= I2C_Vystup(0x12);
            ack |= I2C_Vystup(0x00);
            ack |= I2C_Vystup(0x40);
            ack |= I2C_Vystup(0x00);
            ack |= I2C_Vystup(0x00);
            ack |= I2C_Vystup(hlasitost);
            I2C_Stop();
        }
        printf("Frekvence: %d Hlasitost=%d\n",freq,hlasitost);

    }
    // Pozadovana frekvence * 100
    /*
    // Priklad ladeni stanice
    I2C_Start();
    ack |= I2C_Vystup( SI4735_address | W );
    ack |= I2C_Vystup( 0x20 );          // FM_TUNE_FREQ
    ack |= I2C_Vystup( 0x00 );          // ARG1
    ack |= I2C_Vystup( freq >> 8 );     // ARG2 - FreqHi
    ack |= I2C_Vystup( freq & 0xff );   // ARG3 - FreqLo
    ack |= I2C_Vystup( 0x00 );          // ARG4
    I2C_Stop();
    // kontrola ack!
    // if...
    /*
    // probiha ladeni...
    delay_ms( 100 );
    printf( "...stanice naladena.\n\n" );

    // Priklad cteni frekcence aktualne naladene stanice
    I2C_Start();
    ack |= I2C_Vystup( SI4735_address | W );
    ack |= I2C_Vystup( 0x22 );          // FM_TUNE_STATUS
    ack |= I2C_Vystup( 0x00 );          // ARG1
    // opakovany start
    I2C_Start();
    // zmena smeru komunikace
    ack |= I2C_Vystup( SI4735_address | R );
    // cteni dat
    S1 = I2C_Vstup();
    I2C_Ack();
    S2 = I2C_Vstup();
    I2C_Ack();
    freq = (int) I2C_Vstup() << 8;
    I2C_Ack();
    freq |= I2C_Vstup();
    I2C_Ack();
    RSSI = I2C_Vstup();
    I2C_Ack();
    SNR = I2C_Vstup();
    I2C_Ack();
    MULT = I2C_Vstup();
    I2C_Ack();
    CAP = I2C_Vstup();
    I2C_NAck();
    I2C_Stop();

    if ( ack != 0 )
        printf( "Nastala chyba v komunikaci\n" );
    else
        printf( "Aktualne naladena frekvence je: %d.%dMHz\n", freq / 100, freq % 100 );
*/
    return 0;
}