View difference between Paste ID: yf9bFANr and 01WVubqr

 // ***********************************************************************
 //
 // 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 );
 
 //************************************************************************
 
 struct stav_radia {
 	char S1, S2, RSSI, SNR, MULT, CAP;
 	int FREQ;
 };
 
 typedef struct stav_radia stav_radia;
 
 #define W	0b00000000
 #define R	0b00000001
 #define EXPANDER 0b01001110
 
 char set_volume(char volume)
 {
 	char ack = 0;
 
 	I2C_Start();
 
 	ack |= I2C_Vystup( SI4735_address);
 	ack |= I2C_Vystup( 0x12 ); //set property
 	ack |= I2C_Vystup( 0x00 ); //set property
 	ack |= I2C_Vystup( 0x40 ); //set property
 	ack |= I2C_Vystup( 0x00 ); //set property
 	ack |= I2C_Vystup( 0x00 ); //set property
 	ack |= I2C_Vystup( volume ); //set property
 
 	I2C_Stop();
 
 	return ack;
 }
 char svit_mesicku(char port)
 {
 	char ack = 0;
 
 	I2C_Start();
 
 	// adresovani registru PCF8574
 	// adresa se sklada ze 3 casti!
 	ack = I2C_Vystup(EXPANDER);
 	// kontrola ack, navratova hodnota musi byt 0!
 	// ....
 	// zapis 8 bitu do registru
 	ack |= I2C_Vystup( port );
 	// nyni sviti pozadovane LED
 
 	// konec komunikace
 	I2C_Stop();
 
 	return ack;
 }
 char nalad_stanici(int frekvence)
 {
 	char ack = 0;
 
 	I2C_Start();
 	ack |= I2C_Vystup( SI4735_address);
 	ack |= I2C_Vystup( 0x20 );			// FM_TUNE_FREQ
 	ack |= I2C_Vystup( 0x00 );			// ARG1
 	ack |= I2C_Vystup( frekvence >> 8 );		// ARG2 - FreqHi   00000000 00011000
 	ack |= I2C_Vystup( frekvence & 0xff );	// ARG3 - FreqLo
 	ack |= I2C_Vystup( 0x00 );			// ARG4
 	I2C_Stop();
 
 	return ack;
 }
 char precti_stav_radia(stav_radia * stav)
 {
 	char ack = 0;
 
 	// Priklad cteni frekcence aktualne naladene stanice
 	I2C_Start();
 	ack |= I2C_Vystup( SI4735_address);
 	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
 	stav->S1 = I2C_Vstup();
 	I2C_Ack();
 	stav->S2 = I2C_Vstup();
 	I2C_Ack();
 	stav->FREQ = (int) I2C_Vstup() << 8;
 	I2C_Ack();
 	stav->FREQ |= I2C_Vstup();
 	I2C_Ack();
 	stav->RSSI = I2C_Vstup();
 	I2C_Ack();
 	stav->SNR = I2C_Vstup();
 	I2C_Ack();
 	stav->MULT = I2C_Vstup();
 	I2C_Ack();
 	stav->CAP = I2C_Vstup();
 	I2C_NAck();
 	I2C_Stop();
 
 	return ack;
 }
 char vyhledej_stanici(char nahoru)
 {
 	char ack = 0;
 
 	I2C_Start();
 
 	ack |= I2C_Vystup( SI4735_address);
 	ack |= I2C_Vystup( 0x21 ); //set property
 	ack |= I2C_Vystup( 0b00001000); //set property
 
 	I2C_Stop();
 
 	return ack;
 }
 
 #pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 int main( void )
 {
 	char ack = 0;
 
 	// inicializace prostredi
 	avrkit_init();
 	I2C_Init();
 
 	// komunikace s 8 bitovym expanderem
 	/*
 	// zacatek komunikace
 	I2C_Start();
 
 	// adresovani registru PCF8574
 	// adresa se sklada ze 3 casti!
 	ack = I2C_Vystup( HWADDR_PCF8574 | A012 | R_or_W );
 	// kontrola ack, navratova hodnota musi byt 0!
 	// ....
 	// zapis 8 bitu do registru
 	I2C_Vystup( libovolne_8_bitove_cislo )
 	// nyni sviti pozadovane LED
 
 	// konec komunikace
 	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" );
 
 	// Pozadovana frekvence * 100
 	int freq = 10140;
 	// Priklad ladeni stanice
 	nalad_stanici(freq);
 	// kontrola ack!
 	// if...
 
 	// probiha ladeni...
 	delay_ms( 100 );
 
 	if (ack != 0)
 	{
 		printf("stanice nebyla naladena\n");
 	}
 	else printf( "...stanice naladena.\n\n" );
 
 	stav_radia stav;
 	ack = precti_stav_radia(&stav);
 
 	if ( ack != 0 )
 		printf( "Nastala chyba v komunikaci\n" );
 	else
 		printf( "Aktualne naladena fm je: %d.%dMHz\n", stav.FREQ / 100, stav.FREQ % 100 );
 
 	signed char volume = 10;
 	char led = 1;
 	svit_mesicku(volume);
 
 	while (1)
 	{
 		if (~read_butt() & 0b10000000)
 		{
 			volume += 10;
 
 			if (volume > 63)
 			{
 				volume = 63;
 			}
 
 			if (set_volume(volume) != 0)
 			{
 				printf("neco je spatne\n");
 			}
 			else printf("neco je dobre\n");
 
 			led <<= 1;
 			svit_mesicku(led);
 
 			stav_radia stav;
 			precti_stav_radia(&stav);
 
 			printf("RSSI: %d, SNR: %d, MULT: %d, CAP: %d", stav.RSSI, stav.SNR, stav.MULT, stav.CAP);
 
 			delay_ms(200);
 		}
 
 		if (~read_butt() & 0b01000000)
 		{
 			volume -= 10;
 
 			if (volume < 0)
 			{
 				volume = 0;
 			}
 
 			if (set_volume(volume) != 0)
 			{
 				printf("neco je spatne\n");
 			}
 			else printf("neco je dobre\n");
 
 			led >>= 1;
 			led |= (1 << 7);
 			svit_mesicku(led);
 
 			delay_ms(200);
 		}
 
 		if (~read_butt() & 0b00100000)
 		{
 			nalad_stanici(1);
 
 			delay_ms(200);
 
 			stav_radia stav;
 			precti_stav_radia(&stav);
 
 			printf( "Aktualne naladena fm je: %d.%dMHz\n", stav.FREQ / 100, stav.FREQ % 100 );
 		}
 
 		if (~read_butt() & 0b00010000)
 		{
 			nalad_stanici(0);
 
 			delay_ms(200);
 
 			stav_radia stav;
 			precti_stav_radia(&stav);
 
 			printf( "Aktualne naladena fm je: %d.%dMHz\n", stav.FREQ / 100, stav.FREQ % 100 );
 		}
 	}
 
 	return 0;
 }