// LCD driver - 4-bitova komunikace
// USART
// PIC16F648A

#include <htc.h>

#define _XTAL_FREQ 4000000

// Fuse bity
__CONFIG(FOSC_INTOSCIO & WDTE_OFF & PWRTE_OFF & MCLRE_OFF & BOREN_OFF & LVP_OFF & CPD_OFF & CP_OFF);

// Inicializace
void init() {
	// INTCON
	GIE = 1; // Global Interrupt Enable
	// TRISB
	TRISB1 = 1; // USART RX
	TRISB2 = 1; // USART TX
}


// USART Master TX inicializace (RB1, RB2)
void usartMasterTXInit() {
	SYNC = 1; // Synchronous mode
	BRGH = 0; // Low speed
	SPBRG = 103; // 9600 KBAUD
	CSRC = 1; // Master mode
	SPEN = 1; // Serial port enabled (RB1/RX/DT and RB2/TX/CK)
	TXIE = 1; // USART transmit interrupt
	TXEN = 1; // Transmit enabled
}

// obsluha preruseni
void interrupt gi() {
	GIE = 0;

	if (TXIF) {
		lcdPrintString(2,1,"Data sent ...");
		TXIF = 0;
	}

	GIE = 1;
}

// Hlavni program
void main() {

	init();
	usartMasterTXInit();

	__delay_ms(10000);

	lcdPrintString(1,1,"USART Master");
	lcdPrintString(2,1,"Sending data ...");

	__delay_ms(1000);

	TXREG = 0b11111111;

	while (1) {
	}

}