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/* 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

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

uint8_t getKey(void);
void doButtons(void);

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 buttons;
        uint8_t waitup;
        uint8_t timer;
} debounce;

uint8_t currleds = 128;
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 8)
    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;
    }

  /*
  DDR : 1 = Output, 0 = Input
  PORT: 1 = Pullup for Input, otherwise set output
  PIN : Read input pin
  */
  /*

        PA0     - Input, Pullup - ButtonPad 1
        PA1     - Input, Pullup - ButtonPad 0
        PA2     - Output        - Reset
  */
  DDRD          = 0B00000000;
  PORTD         = 0B00000011;
  /*
        PB0     - Output                - LED 0
        PB1     - Output                - LED 1
        PB2     - Output                - LED 2
        PB3     - Output                - LED 3
        PB4     - Output                - LED 4
        PB5     - Output                - LED 5
        PB6     - Output                - LED 6
        PB7     - Output                - LED 7
  */
  DDRB          = 0B11111111;
  PORTB         = 0B00000000;
  /*

        PD0     - Output        - ButtonPad Gnd1
        PD1     - Output        - ButtonPad Gnd2
        PD2     - Output        - USB D+
        PD3     - Output        - USB D-
        PD4     - Input, Pullup - ButtonPad 2
        PD5     - Input, Pullup - ButtonPad 3
        PD6     - Input, Pullup - Select Switch
  */
  DDRD          = 0B00000011;
  PORTD         = 0B01110011;

        PORTB = 255;
        _delay_ms(20);
        PORTB = currleds;

    //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

    usbInit();
    sei();

    reportBuffer.axis0 = 0;
    reportBuffer.axis1 = 0;
    reportBuffer.buttons = 0;


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

        doButtons();    

        if(usbInterruptIsReady()){ 

                usbSendHidReport(&reportBuffer, sizeof(reportBuffer));
        }

        _delay_ms(1);
    }
    return 0;
}

void doButtons() {
        uint8_t pressed = getKey();

        // Deboucing
        // When i key first goes down, wait 5 ms, check it again to see if its still down
        if (pressed && debounce.buttons == 0 && debounce.timer == 0) {
                debounce.buttons = pressed;
                debounce.timer = 5;
        }

        // The key has come up
        if (pressed != debounce.buttons) {
                debounce.buttons = 0;
                debounce.timer = 0;
                debounce.waitup = 0;
        }

        // Debounce timer is up, process our button
        if (debounce.buttons && debounce.timer == 0 && debounce.waitup != 1) {
                uint8_t i = 0;
                for (i=0; i<=7; i++) {
                        // Button pressed and the led is currently on
                        if ( rbi(debounce.buttons, i) == 1 && rbi(currleds, i) == 1 ) {
                                if ( i == 6 && rbi(currleds, 7) != 1)  //Dont turn off com1 if no comm2
                                        break;

                                if ( i == 7 && rbi(currleds, 6) != 1)  //Dont turn off com2 if no comm1
                                        break;

                                cbi(currleds, i);
                        // Button is pressed and led is currently off
                         } else if ( rbi(debounce.buttons, i) == 1 && rbi(currleds, i) == 0 ) {
                                if ( i == 6 && rbi(currleds, 7) == 1)  //Turn on comm2, turn off comm1
                                        cbi(currleds,7);

                                if ( i == 7 && rbi(currleds, 6) == 1)  //Turn on comm1, turn off comm2
                                        cbi(currleds,6);

                                sbi(currleds, i);
                        }
                }
                PORTB = currleds;
                reportBuffer.buttons = debounce.buttons;
                // Set debounce to wait to button up
                debounce.waitup = 1;
        }
}

// Gnd = PD0, PD1
// Btn = PA1, PA0, PD4, PD5
uint8_t getKey() {
        uint8_t key = 0;

        cbi(PORTD, 0);
        _delay_us(10);        // Wait for the port change
        if (rbi(PIND, 5) == 0) key = 1;
        if (rbi(PIND, 4) == 0) key = 2;
        if (rbi(PINA, 0) == 0) key = 4;
        if (rbi(PINA, 1) == 0) key = 8;
        sbi(PORTD, 0);

        cbi(PORTD, 1);
        _delay_us(10);
        if (rbi(PIND, 5) == 0) key = 16;
        if (rbi(PIND, 4) == 0) key = 32;
        if (rbi(PINA, 0) == 0) key = 64;
        if (rbi(PINA, 1) == 0) key = 128;
        sbi(PORTD, 1);

        return key;
}


ISR(TIMER0_OVF_vect) {
        tmr0_ovf++;

        //16.5Mhz, 1ms = 50ovf

        if (tmr0_ovf>=50) {
                systime++;
                tmr0_ovf = 0;

                if (debounce.timer != 0)
                        debounce.timer--;
        }
}