100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/*
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* Copyright (c) 2009 Andrew Smallbone <andrew@rocketnumbernine.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/sleep.h>
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#include <util/delay.h>
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#include <ds1305.h>
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// following two methods required by DS1305 library to select/deselect device
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void select_ds1305(void)
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{
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PORTD |= (1<<PD4);
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}
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void deselect_ds1305(void)
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{
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PORTD &= ~(1<<PD4);
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}
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// flash led that's connected to pin PD1
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void flash_led(void)
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{
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DDRD |= (1<<PD1);
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for (int i=0; i<10; i++) {
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PORTD ^= (1<<PD1);
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_delay_ms(50);
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}
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}
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// called when pin INT0 goes from 1 to 0
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ISR(INT0_vect)
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{
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// get alarm value to clear alarm interrupt flag on DS1305
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DS1305_DATETIME alarm;
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get_alarm0(&alarm);
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flash_led();
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}
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int main(void)
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{
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// flash LED at start to indicate were about to start
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flash_led();
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flash_led();
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// pin used to enable DS1305
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DDRD = (1<<PD4);
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// Make sure ADC is unselected and setup spi
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deselect_ds1305();
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setup_spi(SPI_MODE_1, SPI_MSB, SPI_NO_INTERRUPT, SPI_MSTR_CLK16);
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set_control(0);
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// set current date/time to Thursday 06/05/09 20:32:30
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DS1305_DATETIME current = {0x30, 0x32, 0x20, 0x05, 0x06, 0x05, 0x09};
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set_time(¤t);
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// change the value of alarm to the required time/granularity:
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// raise alarm every day (at 20:32:00):
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// DS1305_DATETIME alarm = {0x00, 0x32, 0x20, 0x00 | DS1305_ALARM_SET};
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// raise alarm every minute (when seconds = 00):
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// DS1305_DATETIME alarm = {0x00, 0x32 | DS1305_ALARM_SET,
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// 0x20 | DS1305_ALARM_SET, 0x05 | DS1305_ALARM_SET};
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// raise alarm every second:
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DS1305_DATETIME alarm = {0x55 | DS1305_ALARM_SET, 0x32 | DS1305_ALARM_SET,
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0x20 | DS1305_ALARM_SET, 0x05 | DS1305_ALARM_SET};
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set_alarm0(&alarm);
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// turn on timer and make alarm0 lower INT0 pin when alarm is triggered
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set_control(DS1305_EOSC | DS1305_INTCN | DS1305_AIE0);
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// raise interrupt when INT0 pin falls (pin PD0 at AT90usbXXX, pin PD2 on ATmegaXXX (arduino pin 2))
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// the code in ISR(INT0_vect) above will be called
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EICRA = (1<<ISC01) | (0<<ISC00);
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// enable interrupts
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EIMSK = (1<<INT0);
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sei();
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while(1);
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}
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