thermocouple/firmware/main.c

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <avr/eeprom.h>
#include <util/delay.h>

#include <usbdrv/usbdrv.h>


#include "main.h"
#include "display.h"


void hardinit(){
	/* initializes the hardware */
	DDRB = _BV(1) | _BV(2) | _BV(0);
	DDRC = 0x3f;

	// no pullups; all digital outputs can take care of themselves
	PORTB = 0x00;
	PORTC = 0x00;
	PORTD = 0x00;

	/* hardware pwm for brightness/contrast:
	 */

	TCCR1A = _BV(COM1A1) | _BV(COM1B1) | _BV(WGM10);
	TCCR1B = _BV(WGM12) | _BV(CS11); // clk/8 prescaler, 4kHz PWM-freq.

	OCR1A = 15; // contrast
	OCR1B = 50; // brightness
	
	// init LCD:
	lcd_init(1);
	lcd_clrscr(1);

	// 1wire needs no own init, bus search is done in softinit

	sei();
}



void softinit(){

	lcd_defchar(1, LCD_CHAR_HALFBAR, lcd_halfbar_char);
	lcd_defchar(1, LCD_CHAR_BAR, lcd_bar_char);
	lcd_defchar(1, LCD_CHAR_DEGREE,  lcd_degree_char);

}



usbMsgLen_t usbFunctionSetup(uchar data[8])
{
usbRequest_t    *rq = (void *)data;
static uchar    dataBuffer[4];  /* buffer must stay valid when usbFunctionSetup returns */

    if(rq->bRequest == 1){ /* echo -- used for reliability tests */
        dataBuffer[0] = rq->wValue.bytes[0];
        dataBuffer[1] = rq->wValue.bytes[1];
        dataBuffer[2] = rq->wIndex.bytes[0];
        dataBuffer[3] = rq->wIndex.bytes[1];
        usbMsgPtr = dataBuffer;         /* tell the driver which data to return */
        return 4;
    }
    return 0;   /* default for not implemented requests: return no data back to host */
}


int __attribute__((noreturn)) main(void){
	hardinit();
	softinit();
	usbInit();

	display_puts("Hallo, Welt!\n\n");
	display_update();

	
	
	for(;;){
		usbPoll();
	}


}



/*
ISR(TIMER1_OVF_vect, ISR_NAKED){
	asm volatile ("in %0, %1\n" : "=r" (sreg_store) : "I" (_SFR_IO_ADDR(SREG)));
	timer1_acc++;
	asm volatile ("out %1, %0\n" : "=r" (sreg_store) : "I" (_SFR_IO_ADDR(SREG)));
	reti();
}*/