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/*
*
* mur.sat
*
* Somewhen in the year 2012, mur.at will have a nano satellite launched
* into a low earth orbit (310 km above the surface of our planet). The
* satellite itself is a TubeSat personal satellite kit, developed and
* launched by interorbital systems. mur.sat is a joint venture of mur.at,
* ESC im Labor and realraum.
*
* Please visit the project hompage at sat.mur.at for further information.
*
*
* Copyright (C) 2012 Bernhard Tittelbach <xro@realraum.at>
*
* This file is part of mur.sat.
*
* mur.sat 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.
*
* mur.sat 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 mur.sat. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "util.h"
typedef void (*f_ptr_type)(void);
f_ptr_type start_bootloader = (f_ptr_type)0x3800;
void reset(void)
{
cli();
// disable watchdog, if enabled
// disable all peripherals
UDCON = 1;
USBCON = (1<<FRZCLK); // disable USB
UCSR1B = 0;
_delay_ms(5);
EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
start_bootloader();
}
//not switchin off adc produces slightly besser results
void adc_on(void)
{
ADCSRA = (1<<ADEN) | 0b00000111; // enable ADC, Prescaler 1:128
}
void adc_off(void)
{
ADCSRA &= ~(1<<ADEN); // disable ADC -> save power
}
uint8_t adc_read(uint8_t mux)
{
ADCSRB = (mux & 0x20); // select input
ADMUX = 0b11100000 | (mux & 0x1F); // select input cont'd
// select internal 2.56V reference,
// result is left justified
ADCSRA |= (1<<ADSC); // start the conversion
while (ADCSRA & (1<<ADSC)) ; // wait for result
return ADCH;
}
void debug_sprint_int16hex(uint8_t *buffer, int16_t num)
{
int c,n;
for (c=0; c<4; c++)
{
n = (num >> (3-c)*4 ) & 15;
buffer[c] = n + ((n < 10) ? '0' : 'A' - 10);
}
buffer[4]=0;
}
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