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/* Name: main.c
 * Project: hid-data, example how to use HID for data transfer
 * Author: Christian Starkjohann
 * Creation Date: 2008-04-11
 * Tabsize: 4
 * Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH
 * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
 */

//demo modified by SP2AGX for yaesu antenna switch

/*
This example should run on most AVRs with only little changes. No special
hardware resources except INT0 are used. You may have to change usbconfig.h for
different I/O pins for USB. Please note that USB D+ must be the INT0 pin, or
at least be connected to INT0 as well.
*/

#include <stdlib.h>
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>  /* for sei() */
#include <util/delay.h>     /* for _delay_ms() */
#include <avr/eeprom.h>
#include <avr/pgmspace.h>   /* required by usbdrv.h */
#include "usbdrv.h"

/* ----------- application specific defines --------- */
#define LED_PTT_ON()   PORTD&=~_BV(PD4)
#define LED_PTT_OFF()  PORTD|=_BV(PD4)
#define LED_MODE_ON()  PORTB&=~_BV(PB5)
#define LED_MODE_OFF() PORTB|=_BV(PB5)
#define NO_PTT PINC&_BV(PC1)
#define MODE_BUTTON_UP PINB&_BV(PB4)
#define MODE_BUTTON_DOWN !(PINB&_BV(PB4))
#define MODE_AUTO 1
#define MODE_MANUAL 0
/* ----------- runtime variables -------------------- */
//number of samples to average
#define ADC_SAMPLES_MAX 16
//there are 7 buttons, button 0 means none pressed (8 possible input states)
#define BUTTONS_N 8
unsigned char volatile adc_values[ADC_SAMPLES_MAX];
unsigned char volatile adc_index=0;
unsigned char volatile process_keys=0;
unsigned char volatile demanded_antenna=1;
unsigned char volatile selected_antenna=0;
unsigned char volatile operation_mode=MODE_AUTO;
/* ----------- EEPROM variables --------------------- */
#define BAND_COUNT 17
unsigned char ee_band_antenna[BAND_COUNT] EEMEM;

//done: ports initialization
//done: driver control
//done: radio interfacing + PTT lock
//done: key sampling
//done: memory reset
//done: EEPROM programming
//done: USB routines

//prototypes
void switch_antenna(unsigned char n);
inline unsigned char get_band_input();
unsigned char get_button_pressed();

/* ------------------------------------------------------------------------- */
/* ----------------------------- USB interface ----------------------------- */
/* ------------------------------------------------------------------------- */

PROGMEM const char usbHidReportDescriptor[22] = {    /* USB report descriptor */
    0x06, 0x00, 0xff,              // USAGE_PAGE (Generic Desktop)
    0x09, 0x01,                    // USAGE (Vendor Usage 1)
    0xa1, 0x01,                    // COLLECTION (Application)
    0x15, 0x00,                    //   LOGICAL_MINIMUM (0)
    0x26, 0xff, 0x00,              //   LOGICAL_MAXIMUM (255)
    0x75, 0x08,                    //   REPORT_SIZE (8)
    0x95, 0x10,                    //   REPORT_COUNT (16) changed!!!!!!!
    0x09, 0x00,                    //   USAGE (Undefined)
    0xb2, 0x02, 0x01,              //   FEATURE (Data,Var,Abs,Buf)
    0xc0                           // END_COLLECTION
};
/* Since we define only one feature report, we don't use report-IDs (which
 * would be the first byte of the report). The entire report consists of 128
 * opaque data bytes.
 */

/* The following variables store the status of the current data transfer */
//static uchar    currentAddress;
//static uchar    bytesRemaining;
//static uchar    page_flag=0;

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


/* usbFunctionRead() is called when the host requests a chunk of data from
 * the device. For more information see the documentation in usbdrv/usbdrv.h.
 */
uchar   usbFunctionRead(uchar *data, uchar len)
{

  data[0]=operation_mode;
  data[1]=selected_antenna;
  data[2]=demanded_antenna;
  data[3]=get_band_input();
  data[4]=get_button_pressed();
  data[5]=ADCH;
  data[6]=NO_PTT;
  data[7]=0;
  return 8;
}

/* usbFunctionWrite() is called when the host sends a chunk of data to the
 * device. For more information see the documentation in usbdrv/usbdrv.h.
 */
uchar   usbFunctionWrite(uchar *data, uchar len)
{
  if (data[0]=='M'){ // 0x4D
    if (data[1]==1){ //switch to manual mode
      operation_mode=MODE_MANUAL;
      demanded_antenna=data[2];
      switch_antenna(demanded_antenna);
    }
  } else if (data[0]=='A'){// 0x41
    operation_mode=MODE_AUTO;//return to auto mode
  }
    return 1;
}

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

usbMsgLen_t usbFunctionSetup(uchar data[8])
{
usbRequest_t    *rq = (void *)data;

    if((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS){    /* HID class request */
        if(rq->bRequest == USBRQ_HID_GET_REPORT){  /* wValue: ReportType (highbyte), ReportID (lowbyte) */
            /* since we have only one report type, we can ignore the report-ID */
       //page_flag=0;
            return USB_NO_MSG;  /* use usbFunctionRead() to obtain data */
        }else if(rq->bRequest == USBRQ_HID_SET_REPORT){
       //page_flag=0;
            /* since we have only one report type, we can ignore the report-ID */
            return USB_NO_MSG;  /* use usbFunctionWrite() to receive data from host */
        }
    }else{
        /* ignore vendor type requests, we don't use any */
    }
    return 0;
}

/* ------------------------------------------------------------------------- */
//switches the selected antenna relay if not blocked by PTT
void switch_antenna(unsigned char n){
  if (NO_PTT){ // PTT not active
    if (selected_antenna!=n){ //if there is any need to change
      PORTD&=~(_BV(PD5)|_BV(PD6)|_BV(PD7));          //all antennas
      PORTB&=~(_BV(PB0)|_BV(PB1)|_BV(PB2)|_BV(PB3)); //    off
      switch(n){
        case 1:PORTB|=_BV(PB1);break; //PB1
        case 2:PORTB|=_BV(PB2);break; //PB2
        case 3:PORTB|=_BV(PB3);break; //PB3
        case 4:PORTB|=_BV(PB0);break; //PB0
        case 5:PORTD|=_BV(PD7);break; //PD7
        case 6:PORTD|=_BV(PD6);break; //PD6
        case 7:PORTD|=_BV(PD5);break; //PD5
      }
    selected_antenna=n;
    }
  }
}
/* ------------------------------------------------------------------------- */
//returns the selected band from transceiver output
inline unsigned char get_band_input(){
  return (PINC>>2)&0xF; //read the inputs, shift to lower the value and mask high bits
}

/* ------------------------------------------------------------------------- */
//averages ADC samples and picks the most likely pressed button
unsigned char get_button_pressed(){
 uint16_t error_table[BUTTONS_N];
 unsigned char max_adc=0,min_adc=255;
 unsigned char i;
 unsigned char adc_value_avg;
 static const unsigned char perfect_value[]={0, 0xFF, 0xDB, 0xB6, 0x91, 0x6D, 0x48, 0x24 };//zero is simply lack of keys, constant pulldown resistor
 unsigned min_err=0xFFFF,min_err_i=0; //by default assume no key pressed
 
  for (i=0;i<ADC_SAMPLES_MAX;i++){
    if (adc_values[i]>max_adc){ max_adc=adc_values[i]; }
    if (adc_values[i]<min_adc){ min_adc=adc_values[i]; }
  }
 
  if (max_adc-min_adc < 10 ){ //all ADC values look stable, 10 is just a magic number
    adc_value_avg=((uint16_t)max_adc+min_adc)/2;
 
    for (i=0;i<BUTTONS_N;i++){ //compute differences between ADC and perfect key values for each key
      if (adc_value_avg>perfect_value[i]){ //prevents underflow at zero
   error_table[i] =  adc_value_avg - perfect_value[i];
      } else {
   error_table[i] =  perfect_value[i] - adc_value_avg;
      }
    }
    
    for (i=0;i<BUTTONS_N;i++){ //pick the smallest error
      if (error_table[i]<min_err) {
   min_err=error_table[i];
   min_err_i=i;
      }
    }
  }
  return min_err_i;
}
/* ------------------------------------------------------------------------- */
//reset to defaults, then halt
void memory_reset(){
   unsigned char i=0;
   for (i=0;i<BAND_COUNT ;i++){
     eeprom_busy_wait();
     eeprom_write_byte(&ee_band_antenna[i],1);
   }
   LED_MODE_ON();
   LED_PTT_ON();
   PORTD|=_BV(PD6);//some extra leds
   PORTD|=_BV(PD5);
   while (1){
      cli();
      wdt_reset(); //endless loop, wait for power cycle
   }
  
}
/* ------------------------------------------------------------------------- */
int main(void)
{

  wdt_reset();
  wdt_enable(WDTO_1S);

    /* Even if you don't use the watchdog, turn it off here. On newer devices,
     * the status of the watchdog (on/off, period) is PRESERVED OVER RESET!
     */
    /* RESET status: all port bits are inputs without pull-up.
     * That's the way we need D+ and D-. Therefore we don't need any
     * additional hardware initialization.
     */

    usbInit();
    usbDeviceDisconnect();  /* enforce re-enumeration, do this while interrupts are disabled! */

    /* ----- ADC configuration ----- */
    ADMUX = _BV(REFS0)|_BV(ADLAR);//multiplexed button input ADC0, Aref=AVCC+cap, 8-bit left adjust
    ADCSRA = _BV(ADEN) | _BV(ADPS2) |  _BV(ADPS1) | _BV(ADPS0) | _BV(ADSC); //93kHz ADC clock, interrupt enable, start conversion

    /* ----- pins configuration ----- */
    PORTC|=_BV(PC1)|_BV(PC2)|_BV(PC3)|_BV(PC4)|_BV(PC5); //PTT and band input pullup
    DDRD|= _BV(PD4)|_BV(PD5)|_BV(PD6)|_BV(PD7); //PTT_LED and relay driver output
    DDRB|= _BV(PB0)|_BV(PB1)|_BV(PB2)|_BV(PB3)|_BV(PB5); //MODE_LED and relay driver output
    LED_MODE_OFF();
    LED_PTT_OFF();
    PORTB|=_BV(PB4); //mode button input pullup

    /* ---timer configuration for key sampling --- */
    TCCR0 = _BV(CS02); // 256 prescaling, ~180Hz interrupt rate
    TIMSK = _BV(TOIE0);
    
    loop_until_bit_is_set(ADCSRA,ADIF);//wait for the first ADC conversion
    if (ADCH>200){
      memory_reset();
    }
    ADCSRA |= _BV(ADIE); //enable ADC interrupt
    
    unsigned char i = 0;
    while(--i){             /* fake USB disconnect for > 250 ms */
        wdt_reset();
        _delay_ms(1);
    }
    usbDeviceConnect();
    sei();
    
    for(;;){                /* main event loop */
        wdt_reset();
        usbPoll();

   if (process_keys){ //slow processing loop, ~180Hz rate
     process_keys=0;
     unsigned char button=get_button_pressed();
     
     if (button){ //any button pressed
       if (MODE_BUTTON_DOWN){ //memory programming
         eeprom_busy_wait();
         eeprom_write_byte(&ee_band_antenna[get_band_input()],button);
         eeprom_busy_wait();
         operation_mode=MODE_AUTO;
       } else {      //regular manual switch
         operation_mode=MODE_MANUAL;
         demanded_antenna=button;
       }
     }
     
     if (operation_mode==MODE_AUTO){
       demanded_antenna=eeprom_read_byte(&ee_band_antenna[get_band_input()]); //retrive the programmed antenna from eeprom
       LED_MODE_ON();
     } else {
       LED_MODE_OFF();
     }
     
     if (MODE_BUTTON_DOWN){
       operation_mode=MODE_AUTO;
     }
   }

   if (NO_PTT){
     LED_PTT_OFF();
   } else {
     LED_PTT_ON();
   }
   
   switch_antenna(demanded_antenna);
    }
    return 0;
}

/* ------------------------------------------------------------------------- */
//key sampling interrupt

ISR (TIMER0_OVF_vect, ISR_NOBLOCK){ //interrupt should be interruptable
  TIMSK &= ~_BV(TOIE0);//disable timer interrupt
  ADCSRA |= _BV(ADSC); //start next conversion
}

ISR (ADC_vect, ISR_NOBLOCK){ //interrupt should be interruptable
        adc_values[adc_index]=ADCH; //store current value
   adc_index++;
   if (adc_index==ADC_SAMPLES_MAX){
     adc_index=0;
     process_keys=1;
   }
   TCNT0 = 0; //reset delay timer
   TIMSK |= _BV(TOIE0);//enable timer interrupt
}