flm01/avr/calibration.c

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2009-06-05 19:59:55 +00:00
// Copyright (c) 2008 jokamajo.org
// $Id$
2009-06-05 19:59:55 +00:00
// define section, move to main.h later on
// macro's
#ifndef __AVR_ATmega168__
#define __AVR_ATmega168__
#endif
#define METER0 "cccccccccccccccccccccccccccccccc"
#define METER1 "dddddddddddddddddddddddddddddddd"
#define METER2 "eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee"
#define METER3 "ffffffffffffffffffffffffffffffff"
#define START 0
#define END3 0xffffffff
#define END2 0xeeeeeeee
#define END1 0xdddddddd
#define END0 0xcccccccc
// pin definitions
#define METER0PIN 2
#define METER1PIN 3
#define METER2PIN 4
#define METER3PIN 9
#define POTPIN0 6
#define POTPIN1 7
#define POTPIN2 8
#define LEDPIN 13
// end of define
// pin/register/ISR definitions
#include <avr/interrupt.h>
// eeprom library
#include <avr/eeprom.h>
// watchdog timer library
#include <avr/wdt.h>
// variable declarations
uint16_t i;
typedef struct {
boolean pulse0;
boolean toggle0;
boolean pulse1;
boolean toggle1;
boolean pulse2;
boolean toggle2;
boolean pulse3;
boolean toggle3;
} struct_aux;
volatile struct_aux aux = {false, false, false, false, false, false, false, false};
typedef struct {
char meter[513]; //don't forget to reserve a byte for a terminating NULL
} struct_meas;
volatile struct_meas EEMEM EEPROM_measurements;
volatile struct_meas measurements;
// interrupt service routine for analog comparator
ISR(ANALOG_COMP_vect) {
digitalWrite(LEDPIN, HIGH); // sets the LED on
UCSR0B &= ~((1<<RXEN0) | (1<<TXEN0)); //disable UART Tx and Rx
ADCSRA &= ~(1<<ADEN); //disable ADC
ACSR |= (1<<ACD); //disable AC
// PRR |= (1<<PRUSART0) | (1<<PRADC);
eeprom_write_block((const void*)&measurements, (void*)&EEPROM_measurements, sizeof(measurements));
}
// interrupt service routine for watchdog timeout
ISR(WDT_vect) {
}
// disable WDT
void WDT_off(void) {
cli();
wdt_reset();
// clear the WDT reset flag in the status register
MCUSR &= ~(1<<WDRF);
// timed sequence to be able to change the WDT settings afterwards
WDTCSR |= (1<<WDCE) | (1<<WDE);
// disable WDT
WDTCSR = 0x00;
}
// enable WDT
void WDT_on(void) {
// enable the watchdog timer (1s)
wdt_enable(WDTO_1S);
// set watchdog interrupt enable flag
WDTCSR |= (1<<WDIE);
}
void setup()
{
// WDT_off(); -> moved the call to this function to start of the main loop, before init
// clock settings: divide by 8 to get a 1Mhz clock, allows us to set the BOD level to 1.8V (DS p.37)
CLKPR = (1<<CLKPCE);
CLKPR = (1<<CLKPS1) | (1<<CLKPS0);
// load meterid's and metervalues from EEPROM
// eeprom_read_block((void*)&measurements, (const void*)&EEPROM_measurements, sizeof(measurements));
// init serial port
Serial.begin(4800);
delay(100);
pinMode(LEDPIN, OUTPUT);
// DP2=INT0 configuration
pinMode(METER0PIN, INPUT);
// turn on the internal 20k pull-up resistor
digitalWrite(METER0PIN, HIGH);
// set INT0 (=METER0PIN) active LOW interrupt
// DP3=INT1 configuration
pinMode(METER1PIN, INPUT);
// turn on the internal 20k pull-up resistor
digitalWrite(METER1PIN, HIGH);
// set INT1 (=METER1PIN) active LOW interrupt
// PD4=PCINT20 configuration
pinMode(METER2PIN, INPUT);
// turn on the internal 20k pull-up resistor
digitalWrite(METER2PIN, HIGH);
//enable pin change interrupt on PCINT20
PCMSK2 |= (1<<PCINT20);
//pin change interrupt enable 2
PCICR |= (1<<PCIE2);
// PB1=PCINT1 configuration
pinMode(METER3PIN, INPUT);
// turn on the internal 20k pull-up resistor
digitalWrite(METER3PIN, HIGH);
//enable pin change interrupt on PCINT1
PCMSK0 |= (1<<PCINT1);
//pin change interrupt enable 0
PCICR |= (1<<PCIE0);
// analog comparator setup for brown-out detection
// DP6=Vcc+R20k configuration
pinMode(POTPIN0, INPUT);
// turn on the internal 20k pull-up resistor
digitalWrite(POTPIN0, HIGH);
// DP7=AIN1 just configure as input to obtain high impedance
pinMode(POTPIN1, INPUT);
// DP8=GND configuration + connect the DP8 pin to GND
pinMode(POTPIN2, INPUT);
// comparing AIN1 (Vcc/4.4) to bandgap reference (1.1V)
// bandgap select | AC interrupt enable | AC interrupt on rising edge (DS p.243)
ACSR |= (1<<ACBG) | (1<<ACIE) | (1<<ACIS1) | (1<<ACIS0);
WDT_on();
//set global interrupt enable in SREG to 1 (DS p.12)
sei();
for(i=0; i<sizeof(measurements.meter); i++)
measurements.meter[i] = 0x12;
}
void loop()
{
// reset the watchdog timer
wdt_reset();
Serial.println("msg testing the integrity of the UART interface");
delay(500);
}