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///////////////////////////////////////////////////////////////////////////////
//  main.c - Home automation library
// 
//  Main firmware entry point for the attiny-based rf master controller which communicates
//  with an arduino via as a i2c/twi slave at address 0x1.
//
//  Copyright (C) 2009 Jochen Toppe <jochen@jtoee.com>. All right reserved.
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License, or (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
///////////////////////////////////////////////////////////////////////////////

//
// relay receiver hardware setup:
//
// 16MHz external clocked attiny2313
// RX:  data out of rf receiver @ 1200 baud
// TX:  data in of rf transmitter @ 1200 baud
//
// PORTB:
//   PB7: SCL (i2c)
//   PB5: SDA (i2c)
//   PB4: cmd received status  (OUT)
//   PB3: Transmission circuit enable (OUT)

#ifdef TEST
#include <stdio.h>
#else
#include <avr/io.h>
#include <util/delay.h>
#endif

#include "../common/config.h"
#include "../common/uart.h"
#include "../common/commands.h"
#include "../common/protocol.h"
#include "../common/util.h"
#include "serial_master.h"

// twi to communicate with master arduino
#ifndef TEST
#include <../i2c/usiTwiSlave.h>
#include "util/twi.h"

// interrupts
#include <avr/interrupt.h> 
#endif

///////////////////////////////////////////////////////////////////////
// common definitions
///////////////////////////////////////////////////////////////////////
// rf command receiver led (pb)
#define REC_STATUS_LED     4
// transmitter enable pin (pb)
#define TRANSMITTER_ENABLE 3
// twi slave id
#define TWI_ID             1

#ifndef TEST

///////////////////////////////////////////////////////////////////////
// enable/disable transmission circuits
///////////////////////////////////////////////////////////////////////

// turn transmitter on prior to calling the rf send
void pre_hook(void)
{
    enable_bit(PORTB,TRANSMITTER_ENABLE);    
    // let the transmitter settle
    _delay_ms(100);
}

// turn transmitter off after sending the rf command out
void post_hook(void)
{  
  // wait for it to be finished (really, this took me HOURS to f'in debug, I was
  // turning the transmitter off before it was done)
  _delay_ms(100);
  // transmitter off
  disable_bit(PORTB,TRANSMITTER_ENABLE);    
}

///////////////////////////////////////////////////////////////////////
void twiDataRequested(void)
{
  if(!usiTwiDataInTransmitBuffer()) {
    // N for nothing, just so we return something (TWI freezes up on the 
    // master in a blocking read otherwise and a little "Hello, I'm here"
    // is always a nice thing to do :-)
    usiTwiTransmitByte(COMMAND_TYPE_NOOP);
  }
}

///////////////////////////////////////////////////////////////////////
// handle rf commands
///////////////////////////////////////////////////////////////////////

// handle an incoming rf command
uint8_t _outBuffer[MAX_SERIAL_CMD_LEN+1];
void doHandleCommand(struct Command *aCmd)
{
   // signal
   enable_bit(PORTB,REC_STATUS_LED);    

   // transmit via wire back to master
   uint8_t byte_count = serialize_command(aCmd, _outBuffer);
   uint8_t i = 0;
   for(; i<byte_count;i++) {
     usiTwiTransmitByte(_outBuffer[i]);
   }
   
   // led off
   _delay_ms(50);
   disable_bit(PORTB,REC_STATUS_LED);    
}

void init(void)
{
    // register hooks
    setPreSendHook(pre_hook);
    setPostSendHook(post_hook);

    // determine devide id to master device (0xF)
    setDeviceId(MASTER_DEVICE_ID);

    // set LED/tx enable as output
    enable_bit(DDRB,TRANSMITTER_ENABLE);
    enable_bit(DDRB,REC_STATUS_LED);

    // initialize as slave
    usiTwiSlaveInit(TWI_ID);

    // twi callback when master requests data
    _onTwiDataRequest = twiDataRequested; 

    // turn on uart for RF
    uart_initialize(1,1);   

    // enable interrupts
    sei();    
}

//
// code for the relay receiver module.
//

int main(void)
{
    init();

    // handle commands
    while (1)
    {
        // grab all bytes waiting in the twi rx buffer
        while(usiTwiDataInReceiveBuffer())
        {  
          // see if they resemble a command..
        uint8_t bt = usiTwiReceiveByte();
        parse_serial_byte(bt);
        }
        // check the uart for rf transmissions
        if (uart_has_bytes())
        {
            uint8_t havePackage = parse_incoming(uart_receive());
            if (havePackage)
            { 
               // weed out stuff not for me when in slave mode
               if(getDeviceId() == MASTER_DEVICE_ID || getDeviceId() == _incomingCommand.targetDevice)
               {
                 // process command
                 doHandleCommand(&_incomingCommand);
               }
            }
        }      
    }

    return 0;
}

#else
// unit tests
// ////////////////

extern int commonSuite();
extern int masterSuite();
int main(void)
{
    return (commonSuite() || masterSuite());
}

#endif