277 lines
7.1 KiB
C
277 lines
7.1 KiB
C
//
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// main.1mhz.c : AVR uC code for flukso sensor board
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// Copyright (c) 2008-2009 jokamajo.org
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id: main.1mhz.c 3 2009-05-26 20:27:00Z icarus75 $
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#include <string.h>
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#include <stdlib.h>
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#include "wiring/wiring_private.h"
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#include "main.1mhz.h"
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#include <avr/io.h>
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// pin/register/ISR definitions
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#include <avr/interrupt.h>
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// eeprom library
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#include <avr/eeprom.h>
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// watchdog timer library
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#include <avr/wdt.h>
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// variable declarations
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volatile struct state aux[4] = {{false, false, START}, {false, false, START}, {false, false, START}, {false, false, START}};
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volatile struct sensor EEMEM EEPROM_measurements[4] = {{SENSOR0, START}, {SENSOR1, START}, {SENSOR2, START}, {SENSOR3, START}};
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volatile struct sensor measurements[4];
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// interrupt service routine for INT0
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ISR(INT0_vect) {
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measurements[0].value++;
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aux[0].pulse = true;
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}
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// interrupt service routine for INT1
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ISR(INT1_vect) {
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measurements[1].value++;
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aux[1].pulse = true;
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}
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// interrupt service routine for PCI2 (PCINT20 = pin4)
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ISR(PCINT2_vect) {
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if (aux[2].toggle == false) {
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aux[2].toggle = true;
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}
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else {
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measurements[2].value++;
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aux[2].pulse = true;
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aux[2].toggle = false;
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}
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}
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// interrupt service routine for PCI0 (PCINT1 = pin9)
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ISR(PCINT0_vect) {
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if (aux[3].toggle == false) {
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aux[3].toggle = true;
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}
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else {
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measurements[3].value++;
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aux[3].pulse = true;
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aux[3].toggle = false;
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}
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}
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ISR(TIMER2_OVF_vect) {
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// read ADC result
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// add to nano(Wh) counter
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aux[0].nano += (uint32_t)METERCONST * ADC;
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if (aux[0].nano > 1000000000) {
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printString("msg ADC0 sample value: ");
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printIntegerInBase((unsigned long)ADC, 10);
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printString("\n");
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//debugging
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measurements[0].value++;
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aux[0].pulse = true;
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aux[0].nano -= 1000000000;
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}
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// start a new ADC conversion
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ADCSRA |= (1<<ADSC);
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}
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// interrupt service routine for analog comparator
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ISR(ANALOG_COMP_vect) {
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//debugging:
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//measurements[3].value = END3;
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//measurements[2].value = END2;
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//measurements[1].value = END1;
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//measurements[0].value = END0;
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//disable uC sections to consume less power while writing to EEPROM
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//disable UART Tx and Rx:
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UCSR0B &= ~((1<<RXEN0) | (1<<TXEN0));
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//disable ADC:
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ADCSRA &= ~(1<<ADEN);
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// disable AC:
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ACSR |= (1<<ACD);
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for (i=0; i<4; i++)
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eeprom_write_block((const void*)&measurements[i].value, (void*)&EEPROM_measurements[i].value, 4);
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//indicate writing to EEPROM has finished by lighting up the green LED
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PORTB |= (1<<PB5);
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//enable UART Tx and Rx:
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UCSR0B |= (1<<RXEN0) | (1<<TXEN0);
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// enable ADC and start a first ADC conversion
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ADCSRA |= (1<<ADEN) | (1<<ADSC);
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// enable AC
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ACSR &= ~(1<<ACD);
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printString("msg metervalues written to EEPROM (BROWN-OUT)\n");
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}
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// interrupt service routine for watchdog timeout
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ISR(WDT_vect) {
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for (i=0; i<4; i++)
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eeprom_write_block((const void*)&measurements[i].value, (void*)&EEPROM_measurements[i].value, 4);
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printString("msg metervalues written to EEPROM (WDT)\n");
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}
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// disable WDT
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void WDT_off(void) {
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cli();
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wdt_reset();
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// clear the WDT reset flag in the status register
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MCUSR &= ~(1<<WDRF);
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// timed sequence to be able to change the WDT settings afterwards
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WDTCSR |= (1<<WDCE) | (1<<WDE);
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// disable WDT
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WDTCSR = 0x00;
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}
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// enable WDT
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void WDT_on(void) {
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// enable the watchdog timer (1s)
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wdt_enable(WDTO_1S);
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// set watchdog interrupt enable flag
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WDTCSR |= (1<<WDIE);
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}
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void setup()
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{
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// WDT_off(); -> moved the call to this function to start of the main loop, before init
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// clock settings: divide by 8 to get a 1Mhz clock, allows us to set the BOD level to 1.8V (DS p.37)
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CLKPR = (1<<CLKPCE);
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CLKPR = (1<<CLKPS1) | (1<<CLKPS0);
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// load meterid's and metervalues from EEPROM
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eeprom_read_block((void*)&measurements, (const void*)&EEPROM_measurements, sizeof(measurements));
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// init serial port
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beginSerial(4800);
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_delay_ms(100);
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//LEDPIN=PB5/SCK configured as output pin
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DDRB |= (1<<PB5);
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// PD2=INT0 and PD3=INT1 configuration
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// set as input pin with 20k pull-up enabled
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PORTD |= (1<<PD2) | (1<<PD3);
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// INT0 and INT1 to trigger an interrupt on a falling edge
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EICRA = (1<<ISC01) | (1<<ISC11);
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// enable INT0 and INT1 interrupts
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EIMSK = (1<<INT0) | (1<<INT1);
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// PD4=PCINT20 configuration
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// set as input pin with 20k pull-up enabled
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PORTD |= (1<<PD4);
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//enable pin change interrupt on PCINT20
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PCMSK2 |= (1<<PCINT20);
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//pin change interrupt enable 2
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PCICR |= (1<<PCIE2);
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// PB1=PCINT1 configuration
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// set as input pin with 20k pull-up enabled
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PORTB |= (1<<PB1);
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//enable pin change interrupt on PCINT1
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PCMSK0 |= (1<<PCINT1);
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//pin change interrupt enable 0
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PCICR |= (1<<PCIE0);
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// analog comparator setup for brown-out detection
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// PD7=AIN1 configured by default as input to obtain high impedance
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// comparing AIN1 (Vcc/4.4) to bandgap reference (1.1V)
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// bandgap select | AC interrupt enable | AC interrupt on rising edge (DS p.243)
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ACSR |= (1<<ACBG) | (1<<ACIE) | (1<<ACIS1) | (1<<ACIS0);
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// Timer2 normal operation
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// Timer2 clock prescaler set to 32 => fTOV2 = 1000kHz / 256 / 32 = 122.07Hz
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TCCR2B |= (1<<CS21) | (1<<CS20);
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TIMSK2 |= (1<<TOIE2);
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// select VBG as reference for ADC
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ADMUX |= (1<<REFS1) | (1<<REFS0);
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// ADC0 selected by default
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// ADC prescaler set to 16 => 1000kHz / 8 = 125kHz
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ADCSRA |= (1<<ADPS1) | (1<<ADPS0);
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// enable ADC and start a first ADC conversion
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ADCSRA |= (1<<ADEN) | (1<<ADSC);
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WDT_on();
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//set global interrupt enable in SREG to 1 (DS p.12)
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sei();
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}
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void send(const struct sensor *measurement)
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{
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uint8_t i, length;
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char buffer[49];
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// determine the length of value
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ltoa(measurement->value, buffer, 10);
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length = strlen(buffer);
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strcpy(buffer, "pls ");
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strcpy(&buffer[4], measurement->id);
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strcpy(&buffer[36], ":");
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// insert leading 0's
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for (i=0; i<10-length; i++) strcpy(&buffer[37+i], "0");
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ltoa(measurement->value, &buffer[47-length], 10);
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strcpy(&buffer[47], "\n");
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printString(buffer);
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// blink the green LED
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PORTB |= (1<<PB5);
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_delay_ms(100);
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PORTB &= ~(1<<PB5);
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}
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void loop()
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{
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// check whether we have to send out a pls to the deamon
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for (i=0; i<4; i++) {
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if (aux[i].pulse == true) {
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send((const struct sensor *)&measurements[i]);
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aux[i].pulse = false;
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}
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}
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// reset the watchdog timer
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wdt_reset();
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}
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int main(void)
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{
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WDT_off();
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// init();
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setup();
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for (;;) loop();
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return 0;
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}
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