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main.c
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main.c
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/*********************************************************************
* Software License Agreement (BSD License)
*
* Copyright (c) 2018
*
* Balint Cristian <cristian dot balint at gmail dot com>
*
* TinnyModbus
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* * Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*********************************************************************/
/*
main.c (Main application)
*/
#include <stdio.h>
#include <stdlib.h>
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/eeprom.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "crc16.h"
#include "usiuartx.h"
#include "softi2c.h"
#include "atsens.h"
#ifdef DS18B20
#include "1wire.h"
#include "ds18b20.h"
#endif
#ifdef SHT21
#include "sht21.h"
#endif
#ifdef SHT31
#include "sht31.h"
#endif
#ifdef SI1145
#include "si1145.h"
#endif
#ifdef BH1750
#include "bh1750.h"
#endif
#ifdef BMP280
#include "bmp280.h"
#endif
#ifdef BME280
#include "bme280.h"
#endif
// globals
#ifdef ATSENS_H
extern float sensVcc;
extern float sensTmp;
#endif
extern uint8_t EEData[];
uint8_t si1145_done = 0x00;
uint8_t bh1750_done = 0x00;
uint8_t bmp280_done = 0x00;
uint8_t bme280_done = 0x00;
// software version string
static const char PROGMEM SWVers[4] = "0.06"; // 4 octet ASCII
/*
* embed and send modbus frame
*/
static void send_modbus_array( uint8_t *sendbuff, const uint8_t len )
{
// calc checksum
uint16_t csum = clcCRC16( sendbuff, len-2 );
// insert checksum
sendbuff[len-2] = csum & 0xFF;
sendbuff[len-1] = csum >> 8;
// send over rs485 wire
usiuartx_tx_array( &sendbuff[0], len );
}
/*
* send modbus exception
*/
static void send_modbus_exception( uint8_t *sendbuff, uint8_t errcode )
{
sendbuff[1] += 0x80; // exception flag
sendbuff[2] = errcode; // exception code
send_modbus_array( &sendbuff[0], 5 );
}
/*
* main app
*/
int main(void)
{
cli();
// fetch own slave address from EEPROM
uint8_t IdSv = eeprom_read_byte(&EEData[0]);
#ifdef CALIBRATION
// fetch Temperature Offset from EEPROM
float CAL_TOffset = eeprom_read_byte(&EEData[1]) / 10.0f;
// fetch Humidity Offset from EEPROM
float CAL_HOffset = eeprom_read_byte(&EEData[2]) / 10.0f;
#endif
#ifdef ATSENS_H
// internal
// vcc+temp
getSens( 4 );
#endif
#ifdef _DS18B20_H
// 1w pin init
DDRB &= ~(DDB4);
oneWireInit(BUS);
// 1wire devices store
oneWireDevice devices[MAX_DEVICES];
//oneWireSearchBuses(devices, MAX_DEVICES, BUS);
#endif
// init UART
usiuartx_init();
sei();
/*
* receive buffer for modbus frame (fcode = 3,4,6)
* ____________________________________________
* | 1x | 1x | 2x | 2x | 2x |
* |--------+--------+--------+--------+--------|
* | S addr | F code | D addr | D nums | CRC16 |
* |________|________|________|________|________|
*
*/
uint8_t modbus[8];
for (;;)
{
wdt_reset(); // clear watchdog
if ( usiuartx_rx_has_data() ) // check if there is data in the Rx buffer
{
_delay_ms( 5 ); // wait a while for all the data to come
while ( usiuartx_rx_has_data() ) // check if there is data in the internal buffer
{
// shift chain data to left
for (uint8_t k = 1; k < 8; k++)
modbus[k-1] = modbus[k];
// push into chain the new byte
modbus[7] = usiuartx_rx_byte(); // receive a byte
// is our address ?
// is function code valid ?
// only 3,4,6 function code ?
if ( ( modbus[0] == IdSv ) &&
( ( modbus[1] == 0x03 ) ||
( modbus[1] == 0x04 ) ||
( modbus[1] == 0x06 ) )
)
{
// is short crc valid ?
uint16_t crc16 = modbus[6];
crc16 |= (uint16_t)modbus[7] << 8;
if ( crc16 == clcCRC16( modbus, 6 ) )
{
//
// Process MODBUS command
//
// data address
uint16_t daddr = modbus[3];
daddr |= (uint16_t)modbus[2] << 8;
// data amount
uint16_t dnums = modbus[5];
dnums |= (uint16_t)modbus[4] << 8;
// response buffer
uint8_t sendbuff[16];
// fill header
sendbuff[0] = IdSv; // slv addr
// triage cmd
switch( modbus[1] )
{
// read holding register
case 0x03:
sendbuff[1] = 0x03; // fcode
// return MODE
if ( daddr == 0x0000 )
{
// requested amount
if ( modbus[5] != 0x01 ) break;
sendbuff[2] = 0x02; // mslen
sendbuff[3] = 0x00;
sendbuff[4] = 0x00; // main app mode
send_modbus_array( &sendbuff[0], 7 );
}
// return SW VERS
if ( daddr == 0x0001 )
{
// requested amount
if ( modbus[5] != 0x02 ) break;
sendbuff[2] = 0x04; // mslen
// fetch software version
sendbuff[3] = pgm_read_byte(&SWVers[0]);
sendbuff[4] = pgm_read_byte(&SWVers[1]);
sendbuff[5] = pgm_read_byte(&SWVers[2]);
sendbuff[6] = pgm_read_byte(&SWVers[3]);
send_modbus_array( &sendbuff[0], 9 );
}
// return ID SLAVE
if ( daddr == 0x0002 )
{
// requested amount
if ( modbus[5] != 0x01 ) break;
sendbuff[2] = 0x02; // mslen
// read out id slave
IdSv = eeprom_read_byte(&EEData[0]);
// store id slave
sendbuff[3] = 0x00;
sendbuff[4] = IdSv;
send_modbus_array( &sendbuff[0], 7 );
}
#ifdef ATSENS_H
// return internal VCC
if ( daddr == 0x0003 )
{
// requested amount
if ( modbus[5] != 0x02 ) break;
sendbuff[2] = 0x04; // mslen
// reads
getSens( 4 );
// store Vcc
sendbuff[3] = ((uint8_t*)(&sensVcc))[3];
sendbuff[4] = ((uint8_t*)(&sensVcc))[2];
sendbuff[5] = ((uint8_t*)(&sensVcc))[1];
sendbuff[6] = ((uint8_t*)(&sensVcc))[0];
send_modbus_array( &sendbuff[0], 9 );
}
// return internal TMP
if ( daddr == 0x0004 )
{
// requested amount
if ( modbus[5] != 0x02 ) break;
sendbuff[2] = 0x04; // mslen
// reads
getSens( 4 );
// store Temp
sendbuff[3] = ((uint8_t*)(&sensTmp))[3];
sendbuff[4] = ((uint8_t*)(&sensTmp))[2];
sendbuff[5] = ((uint8_t*)(&sensTmp))[1];
sendbuff[6] = ((uint8_t*)(&sensTmp))[0];
send_modbus_array( &sendbuff[0], 9 );
}
#endif
#ifdef CALIBRATION
// read Temperature Offset
if ( daddr == 0x012 )
{
// requested amount
if ( modbus[5] != 0x02 ) break;
sendbuff[2] = 0x04; // mslen
CAL_TOffset = eeprom_read_byte(&EEData[1]) / 10.0f;
float V = CAL_TOffset;
sendbuff[3] = ((uint8_t*)(&V))[3];
sendbuff[4] = ((uint8_t*)(&V))[2];
sendbuff[5] = ((uint8_t*)(&V))[1];
sendbuff[6] = ((uint8_t*)(&V))[0];
send_modbus_array( &sendbuff[0], 9 );
}
// read Humidity Offset
if ( daddr == 0x022 )
{
// requested amount
if ( modbus[5] != 0x02 ) break;
sendbuff[2] = 0x04; // mslen
CAL_HOffset = eeprom_read_byte(&EEData[2]) / 10.0f;
float V = CAL_HOffset;
sendbuff[3] = ((uint8_t*)(&V))[3];
sendbuff[4] = ((uint8_t*)(&V))[2];
sendbuff[5] = ((uint8_t*)(&V))[1];
sendbuff[6] = ((uint8_t*)(&V))[0];
send_modbus_array( &sendbuff[0], 9 );
}
#endif
break; // fcode=0x03
// read input register
case 0x04:
sendbuff[1] = 0x04; // fcode
#ifdef _DS18B20_H
// return MAX_DEVICES
if ( daddr == 0x0000 )
{
// requested amount
if ( modbus[5] != 0x01 ) break;
sendbuff[2] = 0x02; // mslen
sendbuff[3] = 0x00;
sendbuff[4] = MAX_DEVICES;
send_modbus_array( &sendbuff[0], 7 );
}
// return 1W NUMDEVS
if ( daddr == 0x0001 )
{
// requested amount
if ( modbus[5] != 0x01 ) break;
sendbuff[2] = 0x02; // mslen
sendbuff[3] = 0x00;
cli();
uint8_t error = oneWireSearchBuses(devices, MAX_DEVICES, BUS);
sei();
// store 1w number of devices
if ( error == ONEWIRE_SEARCH_COMPLETE )
{
sendbuff[4] = 0x00;
for( uint8_t k = 0; k < MAX_DEVICES; k++ )
if ( devices[k].bus == ONEWIRE_PIN_4 )
sendbuff[4]++;
send_modbus_array( &sendbuff[0], 7 );
}
else
{
// failed to respond
send_modbus_exception( &sendbuff[0], 0x11 );
}
}
// return 1W DEV SERIAL
if ( ( daddr >= 0x0100 ) &&
( daddr <= 0x0120 ) )
{
// requested amount
if ( modbus[5] != 0x04 ) break;
sendbuff[2] = 0x08; // mslen
// store 1w serial given the address
uint8_t iddev = (uint8_t)(daddr - 0x0100);
if ( devices[iddev].bus == ONEWIRE_PIN_4 )
{
for( uint8_t k = 0; k < 8; k++ )
sendbuff[3+k] = devices[iddev].id[k];
send_modbus_array( &sendbuff[0], 13 );
}
else
{
// illegal data address
send_modbus_exception( &sendbuff[0], 0x02 );
}
}
// return 1W DEV TEMP
if ( ( daddr >= 0x0200 ) &&
( daddr <= 0x0200 + MAX_DEVICES ) )
{
// requested amount
if ( modbus[5] != 0x02 ) break;
sendbuff[2] = 0x04; // mslen
// store 1w serial given the address
uint8_t iddev = (uint8_t)(daddr - 0x0100);
// check if device exists
if ( devices[iddev].bus == ONEWIRE_PIN_4 )
{
float temp = 0.0f;
cli();
// attempt to read temp
uint16_t w1temp = ds18b20ReadTemperature( BUS, devices[iddev].id );
sei();
if ( ( w1temp == 0xfffd ) &&
( w1temp == 0xfffe ) )
{
if ( w1temp == 0xfffd )
send_modbus_exception( &sendbuff[0], 0x08 ); // parity error
if ( w1temp == 0xfffe )
send_modbus_exception( &sendbuff[0], 0x11 ); // failed to respond
}
else
{
// compute temp
temp = (float)w1temp * 0.0625f;
// store temp
sendbuff[3] = ((uint8_t*)(&temp))[3];
sendbuff[4] = ((uint8_t*)(&temp))[2];
sendbuff[5] = ((uint8_t*)(&temp))[1];
sendbuff[6] = ((uint8_t*)(&temp))[0];
send_modbus_array( &sendbuff[0], 9 );
}
}
else
{
// illegal data address
send_modbus_exception( &sendbuff[0], 0x02 );
}
}
#endif
#ifdef _SHT21_H
// return I2C DEV VALUES
if ( ( daddr >= 0x1200 ) &&
( daddr <= 0x1201 ) )
{
// requested amount
if ( modbus[5] != 0x02 ) break;
sendbuff[2] = 0x04; // mslen
float V;
if ( daddr == 0x1200 )
{
V = (float)sht21ReadValue( SHT21_TEMP ) / 1000;
#ifdef CALIBRATION
V = V + CAL_TOffset;
#endif
}
if ( daddr == 0x1201 )
{
V = (float)sht21ReadValue( SHT21_HUMI ) / 1000;
#ifdef CALIBRATION
V = V + CAL_HOffset;
#endif
}
sendbuff[3] = ((uint8_t*)(&V))[3];
sendbuff[4] = ((uint8_t*)(&V))[2];
sendbuff[5] = ((uint8_t*)(&V))[1];
sendbuff[6] = ((uint8_t*)(&V))[0];
send_modbus_array( &sendbuff[0], 9 );
}
#endif
#ifdef _SHT31_H
// return I2C DEV VALUES
if ( ( daddr >= 0x1250 ) &&
( daddr <= 0x1251 ) )
{
// requested amount
if ( modbus[5] != 0x02 ) break;
sendbuff[2] = 0x04; // mslen
float V;
if ( daddr == 0x1250 )
{
V = (float)sht31ReadValue( SHT31_TEMP ) / 100;
#ifdef CALIBRATION
V = V + CAL_TOffset;
#endif
}
if ( daddr == 0x1251 )
{
V = (float)sht31ReadValue( SHT31_HUMI ) / 100;
#ifdef CALIBRATION
V = V + CAL_HOffset;
#endif
}
sendbuff[3] = ((uint8_t*)(&V))[3];
sendbuff[4] = ((uint8_t*)(&V))[2];
sendbuff[5] = ((uint8_t*)(&V))[1];
sendbuff[6] = ((uint8_t*)(&V))[0];
send_modbus_array( &sendbuff[0], 9 );
}
#endif
#ifdef _SI1145_H
// return I2C DEV VALUES
if ( ( daddr >= 0x1210 ) &&
( daddr <= 0x1212 ) )
{
// requested amount
if ( modbus[5] != 0x02 ) break;
sendbuff[2] = 0x04; // mslen
if ( si1145_done == 0x00 )
{
si1145_init();
si1145_done = 0x01;
}
float V;
if ( daddr == 0x1210 )
V = si1145_read_value(SI1145_READ_VI);
if ( daddr == 0x1211 )
V = si1145_read_value(SI1145_READ_IR);
if ( daddr == 0x1212 )
V = si1145_read_value(SI1145_READ_UV);
sendbuff[3] = ((uint8_t*)(&V))[3];
sendbuff[4] = ((uint8_t*)(&V))[2];
sendbuff[5] = ((uint8_t*)(&V))[1];
sendbuff[6] = ((uint8_t*)(&V))[0];
send_modbus_array( &sendbuff[0], 9 );
}
#endif
#ifdef _BH1750_H
// return I2C DEV VALUES
if ( daddr == 0x1220 )
{
// requested amount
if ( modbus[5] != 0x02 ) break;
sendbuff[2] = 0x04; // mslen
if ( bh1750_done == 0x00 )
{
bh1750_init();
bh1750_done = 0x01;
}
float V = bh1750_read_value();
sendbuff[3] = ((uint8_t*)(&V))[3];
sendbuff[4] = ((uint8_t*)(&V))[2];
sendbuff[5] = ((uint8_t*)(&V))[1];
sendbuff[6] = ((uint8_t*)(&V))[0];
send_modbus_array( &sendbuff[0], 9 );
}
#endif
#ifdef _BMP280_H
// return I2C DEV VALUES
if ( ( daddr >= 0x1230 ) &&
( daddr <= 0x1231 ) )
{
// requested amount
if ( modbus[5] != 0x02 ) break;
sendbuff[2] = 0x04; // mslen
if ( bmp280_done == 0x00 )
{
bmp280_init();
bmp280_done = 0x01;
}
int32_t V;
if ( daddr == 0x1230 )
{
V = bmp280_read_value( BMP280_TEMP );
#ifdef CALIBRATION
V = V + CAL_TOffset;
#endif
}
if ( daddr == 0x1231 )
V = bmp280_read_value( BMP280_PRES );
sendbuff[3] = ((uint8_t*)(&V))[3];
sendbuff[4] = ((uint8_t*)(&V))[2];
sendbuff[5] = ((uint8_t*)(&V))[1];
sendbuff[6] = ((uint8_t*)(&V))[0];
send_modbus_array( &sendbuff[0], 9 );
}
#endif
#ifdef _BME280_H
// return I2C DEV VALUES
if ( ( daddr >= 0x1240 ) &&
( daddr <= 0x1242 ))
{
// requested amount
if ( modbus[5] != 0x02 ) break;
sendbuff[2] = 0x04; // mslen
if ( bme280_done == 0x00 )
{
bme280_init();
bme280_done = 0x01;
}
int32_t V;
if ( daddr == 0x1240 )
{
V = bme280_read_value( BME280_TEMP );
#ifdef CALIBRATION
V = V + CAL_TOffset;
#endif
}
if ( daddr == 0x1241 )
{
V = bme280_read_value( BME280_PRES );
}
if ( daddr == 0x1242 )
{
V = bme280_read_value( BME280_HUM );
#ifdef CALIBRATION
V = V + CAL_HOffset;
#endif
}
sendbuff[3] = ((uint8_t*)(&V))[3];
sendbuff[4] = ((uint8_t*)(&V))[2];
sendbuff[5] = ((uint8_t*)(&V))[1];
sendbuff[6] = ((uint8_t*)(&V))[0];
send_modbus_array( &sendbuff[0], 9 );
}
#endif
break; // fcode=0x04
// write input register
case 0x06:
sendbuff[1] = 0x06; // fcode
// change MODE
if ( daddr == 0x0000 )
{
// value 0x00
if ( ( modbus[4] == 0x00 ) &&
( modbus[5] == 0x01 ) )
{
// confirm mode switch
usiuartx_tx_array( &modbus[0], 8 );
_delay_ms( 50 );
cli(); // suspend all interrupts
// jump LOADER
asm volatile
(
// 'FLASH' message into stack
" ldi r30, 0x42 \n\t" // 'B'
" push r30 \n\t"
" ldi r30, 0x4F \n\t" // 'O'
" push r30 \n\t"
" ldi r30, 0x4F \n\t" // 'O'
" push r30 \n\t"
" ldi r30, 0x54 \n\t" // 'T'
" push r30 \n\t"
// jump into bootloader (0x1C00)
" ldi r30, 0x00 \n\t"
" ldi r31, 0x0E \n\t"
" ijmp \n\t"
);
}
else
{
// illegal data value
send_modbus_exception( &modbus[0], 0x03 );
}
}
// write ID SLAVE
if ( daddr == 0x0001 )
{
// values within 0x01 - 0xfe
if ( ( modbus[4] == 0x00 ) &&
( ( modbus[5] > 0x00 ) &&
( modbus[5] < 0xff ) )
)
{
// write new id slave
IdSv = modbus[5];
eeprom_write_byte( &EEData[0], IdSv );
usiuartx_tx_array( &modbus[0], 8 );
}
else
{
// illegal data value
send_modbus_exception( &sendbuff[0], 0x03 );
}
}
#ifdef CALIBRATION
// write Temperature Offset (8bit signed int)
if ( daddr == 0x0011 )
{
// values within 0x00 - 0xff
if ( ( modbus[4] == 0x00 ) &&
( ( modbus[5] >= 0x00 ) &&
( modbus[5] <= 0xff ) )
)
{
// write new Temperature Offset
eeprom_write_byte( &EEData[1], modbus[5]);
usiuartx_tx_array( &modbus[0], 8 );
}
else
{
// illegal data value
send_modbus_exception( &sendbuff[0], 0x03 );
}
}
// write Humidity Offset (8bit signed int)
if ( daddr == 0x0021 )
{
// values within 0x00 - 0xff
if ( ( modbus[4] == 0x00 ) &&
( ( modbus[5] >= 0x00 ) &&
( modbus[5] <= 0xff ) )
)
{
// write new Humidity Offset
eeprom_write_byte( &EEData[2], modbus[5]);
usiuartx_tx_array( &modbus[0], 8 );
}
else
{
// illegal data value
send_modbus_exception( &sendbuff[0], 0x03 );
}
}
#endif
break; // fcode=0x06
} // end switch fcode
} // end with valid crc
} // end valid modbus cmd
} // end internal buffer
} // end rx ring-buffer data
} // end main loop
return 0;
}