Subversion Repositories group.electronics

/* Name: main.c

 * Project: EasyLogger

 * Author: Christian Starkjohann

 * Creation Date: 2006-04-23

 * Tabsize: 4

 * Copyright: (c) 2006 by OBJECTIVE DEVELOPMENT Software GmbH

 * License: Proprietary, free under certain conditions. See Documentation.

 * This Revision: $Id$

 */

#include <avr/io.h>

#include <avr/wdt.h>

#include <avr/eeprom.h>

#include <avr/interrupt.h>

#include <avr/pgmspace.h>

#include <util/delay.h>

#include "usbdrv.h"

#include "oddebug.h"

#include "config.h"

#ifndef NULL

#define NULL    ((void *)0)

#endif

/* ------------------------------------------------------------------------- */

struct {

	union {

		int16_t axis[2];

		struct {

			int16_t axis0:16;

			int16_t axis1:16;

		};

		uint8_t buttons;

		struct {

			int8_t b1:1;

			int8_t b2:2;

			int8_t b3:3;

			int8_t b4:4;

			int8_t b5:5;

			int8_t b6:6;

			int8_t b7:7;

			int8_t b8:8;

		};

	};

} reportBuffer;

volatile struct {

        uint8_t current;

        uint8_t last;

        uint8_t mask;

} pcInt[1];

volatile struct {

	uint8_t button;

	uint8_t timer;

} buttons;

static uchar    idleRate;           /* in 4 ms units */

volatile uint8_t tmr0_ovf = 0;

volatile uint32_t systime = 0;

/* ------------------------------------------------------------------------- */

const PROGMEM char usbHidReportDescriptor[USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH] = { /* USB report descriptor */

    0x05, 0x01,                    // USAGE_PAGE (Generic Desktop)

    0x09, 0x05,                    // USAGE (Game Pad)

    0xa1, 0x01,                    // COLLECTION (Application)

    0x09, 0x01,                    //   USAGE (Pointer)

    0xa1, 0x00,                    //   COLLECTION (Physical)

    0x09, 0x30,                    //     USAGE (X)

    0x09, 0x31,                    //     USAGE (Y)

    0x16, 0x00, 0x80,		   //	  Log Min -32768

    0x26, 0xff, 0x7f,		   //	  Log max 32768

    0x75, 0x10,                    //     REPORT_SIZE (16)

    0x95, 0x02,                    //     REPORT_COUNT (2)

    0x81, 0x02,                    //     INPUT (Data,Var,Abs)

    0x05, 0x09,                    //     USAGE_PAGE (Button)

    0x19, 0x01,                    //     USAGE_MINIMUM (Button 1)

    0x29, 0x08,                    //     USAGE_MAXIMUM (Button 2)

    0x15, 0x00,                    //     LOGICAL_MINIMUM (0)

    0x25, 0x01,                    //     LOGICAL_MAXIMUM (1)

    0x75, 0x01,                    //     REPORT_SIZE (1)

    0x95, 0x08,                    //     REPORT_COUNT (2)

    0x81, 0x02,                    //     INPUT (Data,Var,Abs)

    0xc0,                          //   END_COLLECTION

    0xc0                           // END_COLLECTION

};

uchar	usbFunctionSetup(uchar data[8])

{

    usbRequest_t    *rq = (void *)data;

    //usbMsgPtr = reportBuffer;

    if((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS){ 

        if(rq->bRequest == USBRQ_HID_GET_REPORT){ 

            return sizeof(reportBuffer);

        }else if(rq->bRequest == USBRQ_HID_GET_IDLE){

            usbMsgPtr = &idleRate;

            return 1;

        }else if(rq->bRequest == USBRQ_HID_SET_IDLE){

            idleRate = rq->wValue.bytes[1];

        }

    }else{

    }

	return 0;

}

static void calibrateOscillator(void) {

    uchar step = 128;

    uchar trialValue = 0, optimumValue;

    int x, optimumDev;

    int targetValue = (unsigned)(1499 * (double)F_CPU / 10.5e6 + 0.5);

    /* do a binary search: */

    do {

        OSCCAL = trialValue + step;

        x = usbMeasureFrameLength();    /* proportional to current real frequency */

        if(x < targetValue)             /* frequency still too low */

            trialValue += step;

        step >>= 1;

    } while(step > 0);

    /* We have a precision of +/- 1 for optimum OSCCAL here */

    /* now do a neighborhood search for optimum value */

    optimumValue = trialValue;

    optimumDev = x; /* this is certainly far away from optimum */

    for(OSCCAL = trialValue - 1; OSCCAL <= trialValue + 1; OSCCAL++){

        x = usbMeasureFrameLength() - targetValue;

        if(x < 0)

            x = -x;

        if(x < optimumDev){

            optimumDev = x;

            optimumValue = OSCCAL;

        }

    }

    OSCCAL = optimumValue;

}

void usbEventResetReady(void) {

    cli();

    calibrateOscillator();

    sei();

    eeprom_write_byte(0, OSCCAL);   /* store the calibrated value in EEPROM */

}

void usbSendHidReport(uchar * data, uchar len) {

	usbSetInterrupt(data, len);

}

int main(void) {

uchar   i;

uchar   calibrationValue;

    calibrationValue = eeprom_read_byte(0); /* calibration value from last time */

    if(calibrationValue != 0xff){

        OSCCAL = calibrationValue;

    }

    odDebugInit();

    usbDeviceDisconnect();

    for(i=0;i<20;i++){  /* 300 ms disconnect */

        _delay_ms(15);

    }

    usbDeviceConnect();

    wdt_enable(WDTO_1S);

    TIMSK = (1<<TOIE0);                    // Enable timer overflow

    TCNT0 = 0x00;                           // Set Timer0 initial value to 0

    TCCR0B = (1<< CS01) ;                   // /1 prescaler

    DDRB          = 0B00000001;

    PORTB         = 0B00000000;

    usbInit();

    sei();

    reportBuffer.axis0 = 0;

    reportBuffer.axis1 = 0;

    reportBuffer.buttons = 0;

    for(;;){    /* main event loop */

        wdt_reset();

        usbPoll();

        if(usbInterruptIsReady()){ 

		// ReportBuffer logic here

		usbSendHidReport(&reportBuffer, sizeof(reportBuffer));

        }

    }

    return 0;

}

void pcInterrupt(uint8_t pcint) {

        switch (pcint) {

                case 0: pcInt[pcint].current = PINB; break;

        }

        pcInt[pcint].mask = pcInt[pcint].current ^ pcInt[pcint].last;

        pcInt[pcint].last = pcInt[pcint].current;

        if (pcInt[pcint].mask == 0)

		return;

	// PCINT logic here

        // Clear the mask so we know we've delth with it

        pcInt[pcint].mask = 0;

}

ISR(PCINT0_vect) {

        pcInterrupt(0);

}

ISR(TIMER0_OVF_vect) {

        tmr0_ovf++;

        if (tmr0_ovf>=50) {

                systime++;

                tmr0_ovf = 0;

        }

}