/*
 *  spreadspace avr utils - usb-bmp180 example
 *
 *
 *  Copyright (C) 2016 Bernhard Tittelbach <bernhard@tittelbach.org>
 *  basically this is refactored and enhanced code from:
 *   https://github.com/sparkfun/BMP180_Breakout_Arduino_Library
 *   Please buy the sparkfun people Beer when you see them!!!!
 *
 *  This file is part of spreadspace avr utils.
 *
 *  spreadspace avr utils is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  any later version.
 *
 *  spreadspace avr utils 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
 */

#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdio.h>

#include <LUFA/Drivers/Peripheral/SPI.h>

#include "util.h"
#include "usbio.h"
#include "bmp280.h"

#define ALTITUDE_GRAZ 353.0 // Altitude of Graz in Austria

#define PIN_CS_S0 PD1
#define REG_CS_S0 PIND
#define PIN_CS_S1 PD0
#define REG_CS_S1 PIND

#define OP_SETBIT |=
#define OP_CLEARBIT &= ~
#define OP_CHECK &
#define PIN_SW(PORTDDRREG, PIN, OP) PORTDDRREG OP (1 << PIN)
#define PINMODE_OUTPUT(REG, PIN) *(&REG+1) |= (1 << PIN)  //just use DDR instead of PORT
#define PINMODE_INPUT(REG, PIN) *(&REG+1) &= ~(1 << PIN)  //just use DDR instead of PORT
#define PINREG(x) x
#define DDRREG(x) *(&x+1)
#define PORTREG(x) *(&x+2)

#define HIGHv OP_SETBIT
#define LOWv OP_CLEARBIT

#define CS_SENSOR_0(LOWHIGH) (PIN_SW(PORTREG(REG_CS_S0),PIN_CS_S0,LOWHIGH))
#define CS_SENSOR_1(LOWHIGH) (PIN_SW(PORTREG(REG_CS_S1),PIN_CS_S1,LOWHIGH))
#define CS_SENSOR(x,LOWHIGH) CS_SENSOR_##x(LOWHIGH)

/*
=== Our Coefficients ===
T1: 28483, T2: 26628, T3: 50
P1: 37848, P2: -10585, P3: 3024, P4: 9882, P5: -217, P6: -7, P7: 15500, P8: -14600, P9: 6000

=== Adafruit Arduino Reference Coefficients ===
T1: 28483, T2: 26628, T3: 50
P1: 37848, P2: -10585, P3: 3024, P4: 9882, P5: -217, P6: -7, P7: 15500, P8: -14600, P9: 6000
*/

void printCoeffs(bmp280_sensor *sensor)
{
  printf("T1: %u, T2: %d, T3: %d\r\n", sensor->dig_T1, sensor->dig_T2, sensor->dig_T3);
  printf("P1: %u, P2: %d, P3: %d, P4: %d, P5: %d, P6: %d, P7: %d, P8: %d, P9: %d\r\n",sensor->dig_P1,sensor->dig_P2,sensor->dig_P3,sensor->dig_P4,sensor->dig_P5,sensor->dig_P6,sensor->dig_P7,sensor->dig_P8,sensor->dig_P9);
  //printf("H1: %d, H2: %d, H3: %d, H4: %d, H5: %d, H6: %d\r\n",sensor->dig_H1,sensor->dig_H2,sensor->dig_H3,sensor->dig_H4,sensor->dig_H5,sensor->dig_H6);
}

int main(void)
{
  MCUSR &= ~(1 << WDRF);
  wdt_disable();

  cpu_init();
  usbio_init();
  sei();

  bmp280_sensor sensor0;
  bmp280_sensor sensor1;

  uint8_t sensor0_available = 0;
  uint8_t sensor1_available = 0;

  //CS Output
  PINMODE_OUTPUT(REG_CS_S0,PIN_CS_S0);
  PINMODE_OUTPUT(REG_CS_S1,PIN_CS_S1);
  //CS High
  CS_SENSOR(0,HIGHv);
  CS_SENSOR(1,HIGHv);
  //LUFA SPI
  SPI_Init(BMP280_LUFA_SPIO_OPTIONS);

  printf("USB-SPI-BMP280 starting");
  
  bmp280_result tmppres;
  float altitude;
  
  for(;;) {
    printf("\r\n== Sensor 0 ==\r\n");
    if (sensor0_available)
    {
      printCoeffs(&sensor0);
      tmppres = bmp280_readTempAndPressure(&sensor0);
      altitude = bmp280_calcAltitude(tmppres.pressure, BMP280_AVERAGE_SEA_LEVEL_PRESSURE);
      printf("\r\nPressure: %.2f Pa @ %.2f degC\r\n", tmppres.pressure, tmppres.temperature);
      printf("Altitude: %.2fm (guessing)\r\n", altitude);
      sensor0_available = bmp280_check_chipid(&sensor0);
    } else {
      printf("  not available\r\n");
      sensor0_available = bmp280_init(&sensor0, &PORTREG(REG_CS_S0), PIN_CS_S0);
    }

    printf("\r\n== Sensor 1 ==\r\n");
    if (sensor1_available)
    {  
      printCoeffs(&sensor1);
      tmppres = bmp280_readTempAndPressure(&sensor1);
      altitude = bmp280_calcAltitude(tmppres.pressure, BMP280_AVERAGE_SEA_LEVEL_PRESSURE);
      printf("\r\nPressure: %.2f Pa @ %.2f degC\r\n", tmppres.pressure, tmppres.temperature);
      printf("Altitude: %.2fm (approximate)\r\n", altitude);
      sensor1_available = bmp280_check_chipid(&sensor1);
    } else {
      printf("  not available\r\n");
      sensor1_available = bmp280_init(&sensor1, &PORTREG(REG_CS_S1), PIN_CS_S1);
    }

    usbio_task();

    _delay_ms(3000); // Pause for 3 seconds.
  }
}