ModbusIO_main.c

/*
* This file is part of the ModbusIO project.
*
* Copyright (C) 2020 Hans Unzner <hansunzner@gmail.com>
*
* This program 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
* (at your option) any later version.
*
* This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <p18f2620.h>
#include <delays.h>
#include <usart.h>
#include <pwm.h>
#include <timers.h>
#include <adc.h>
#include "delay_user.h"
#include <stdio.h>
#include "modbus.h"

 /** Configuration ********************************************************/
#pragma  config  OSC = INTIO67
#pragma  config  PWRT = ON      // power up timer on
#pragma  config  BOREN = OFF    // brown out detect
#pragma  config  WDT = OFF      // watchdog off
#pragma  config  LVP = OFF      // lvp off
#pragma  config  FCMEN = OFF
#pragma  config  IESO = OFF
#pragma  config  MCLRE = OFF
#pragma  config  PBADEN = OFF
#pragma  config  DEBUG = OFF

#define N_ADC_CHANNELS 4
#define BAUD19200


typedef struct{
  UINT16 anValuesAVG[16];
  UINT8 nIndexAVG;
  UINT32 nSum;
} SMA_t;

UINT16 anADCValues_RAW[N_ADC_CHANNELS];
#pragma udata my_memory_section_3
SMA_t astAVGValues_0 = {{0}};
#pragma udata my_memory_section_4
SMA_t astAVGValues_1 = {{0}};
#pragma udata my_memory_section_5
SMA_t astAVGValues_2 = {{0}};
#pragma udata my_memory_section_6
SMA_t astAVGValues_3 = {{0}};

#pragma udata

UINT16 MovingAVG(SMA_t *pstValues, UINT8 nNumber, UINT16 nInput)
{
  pstValues->nSum -= pstValues->anValuesAVG[pstValues->nIndexAVG];
  pstValues->anValuesAVG[pstValues->nIndexAVG] = nInput;
  pstValues->nSum += nInput;

  if(pstValues->nIndexAVG < (nNumber-1))
    pstValues->nIndexAVG++;
  else
    pstValues->nIndexAVG=0;
  switch(nNumber){
    case 4:
      return pstValues->nSum >> 2;
    case 8:
      return pstValues->nSum >> 3;
    case 16:
      return pstValues->nSum >> 4;
  }
}

#pragma code
void main(void)
{
  const char anWelcomeString[] ={"ModbusIO starting...\r\n"};
  OSCTUNEbits.PLLEN=1;  //PLL enable
  OSCCONbits.IRCF0=1;   //8 MHz clock
  OSCCONbits.IRCF1=1;
  OSCCONbits.IRCF2=1;

  TRISA = 0xFF;         // Set to input
  TRISC = 0b10000000;   // Set all to output except UART RX
  TRISB = 0xFF;         // Set to input
  INTCON2bits.RBPU = 0; // enable PORTB pull-ups

//  ADCON2 = 0b10110101;  //right, 16 TAD, FOSC/16
//  ADCON1 = 0b00001011;  //PortA AD I/O
//  ADCON0 = 0b00001101;

  OpenPWM1(200);
  OpenTimer2(T2_PS_1_4 & TIMER_INT_OFF);
  SetDCPWM1(30);
  RCONbits.IPEN = 0;      //Disable priority levels on interrupts
  Nop();
  INTCON = 0;
  INTCONbits.GIE = 1;      //global interrupts enable
  INTCONbits.PEIE = 1;    //global interrupts enable
//  PIE2 = 0;
//  PIE1bits.RCIE = 1;      //Enables the EUSART receive interrupt


  // T0_PS_1_32 = 1.05 s

  OpenTimer0(TIMER_INT_ON & T0_16BIT & T0_SOURCE_INT & T0_PS_1_32);
  OpenTimer1(TIMER_INT_ON & T1_16BIT_RW & T1_SOURCE_INT & T1_PS_1_2 & T1_OSC1EN_OFF);

  Delay1KTCYx(100);    //50ms

#ifdef BAUD19200
  // Configure USART @19200 Baud 8N1 (spbrg = (f_osc/(16*Baudrate))-1)
  OpenUSART( USART_TX_INT_OFF & USART_RX_INT_ON & USART_BRGH_HIGH & USART_ASYNCH_MODE & USART_EIGHT_BIT & USART_CONT_RX,  25);
#endif
   putsUSART ((char*)anWelcomeString);

  while(1)
  {
    // Channel 0
    OpenADC(ADC_FOSC_16 & ADC_RIGHT_JUST & ADC_16_TAD, ADC_CH0 & ADC_INT_OFF & ADC_REF_VDD_VSS, ADC_4ANA);
    ConvertADC();
    while(BusyADC());
    anADCValues_RAW[0] = ReadADC();

    // Channel 1
    OpenADC(ADC_FOSC_16 & ADC_RIGHT_JUST & ADC_16_TAD, ADC_CH1 & ADC_INT_OFF & ADC_REF_VDD_VSS, ADC_4ANA);
    ConvertADC();
    while(BusyADC());
    anADCValues_RAW[1] = ReadADC();
     // Channel 2
    OpenADC(ADC_FOSC_16 & ADC_RIGHT_JUST & ADC_16_TAD, ADC_CH2 & ADC_INT_OFF & ADC_REF_VDD_VSS, ADC_4ANA);
    ConvertADC();
    while(BusyADC());
    anADCValues_RAW[2] = ReadADC();

    // Channel 3
    OpenADC(ADC_FOSC_16 & ADC_RIGHT_JUST & ADC_16_TAD, ADC_CH3 & ADC_INT_OFF & ADC_REF_VDD_VSS, ADC_4ANA);
    ConvertADC();
    while(BusyADC());
    anADCValues_RAW[3] = ReadADC();

    anModbus_HoldingRegister[0] = MovingAVG(&astAVGValues_0, 16, anADCValues_RAW[0]*10);
    anModbus_HoldingRegister[1] = MovingAVG(&astAVGValues_1, 16, anADCValues_RAW[1]*10);
    anModbus_HoldingRegister[2] = MovingAVG(&astAVGValues_2, 16, anADCValues_RAW[2]*10);
    anModbus_HoldingRegister[3] = MovingAVG(&astAVGValues_3, 16, anADCValues_RAW[3]*10);
    anModbus_HoldingRegister[4] = anADCValues_RAW[0];
    anModbus_HoldingRegister[5] = anADCValues_RAW[1];
    anModbus_HoldingRegister[6] = anADCValues_RAW[2];
    anModbus_HoldingRegister[7] = anADCValues_RAW[3];

    Delayms(10);
  }

}