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/*
* Copyright © 2009 Keith Packard <keithp@keithp.com>
*
* This program 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; version 2 of the License.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao.h"
static volatile __data uint16_t ao_tick_count;
uint16_t ao_time(void)
{
uint16_t v;
ao_arch_critical(
v = ao_tick_count;
);
return v;
}
static __xdata uint8_t ao_forever;
void
ao_delay(uint16_t ticks)
{
ao_alarm(ticks);
ao_sleep(&ao_forever);
}
#define T1_CLOCK_DIVISOR 8 /* 24e6/8 = 3e6 */
#define T1_SAMPLE_TIME 30000 /* 3e6/30000 = 100 */
#if HAS_ADC
volatile __data uint8_t ao_adc_interval = 1;
volatile __data uint8_t ao_adc_count;
#endif
void
ao_debug_out(char c);
ISR(TIMER1_COMPA_vect)
{
++ao_tick_count;
#if HAS_ADC
if (++ao_adc_count == ao_adc_interval) {
ao_adc_count = 0;
ao_adc_poll();
}
#endif
}
#if HAS_ADC
void
ao_timer_set_adc_interval(uint8_t interval) __critical
{
ao_adc_interval = interval;
ao_adc_count = 0;
}
#endif
void
ao_timer_init(void)
{
TCCR1A = ((0 << WGM11) | /* CTC mode, OCR1A */
(0 << WGM10)); /* CTC mode, OCR1A */
TCCR1B = ((0 << ICNC1) | /* no input capture noise canceler */
(0 << ICES1) | /* input capture on falling edge (don't care) */
(0 << WGM13) | /* CTC mode, OCR1A */
(1 << WGM12) | /* CTC mode, OCR1A */
(3 << CS10)); /* clk/64 from prescaler */
#if TEENSY
OCR1A = 2500; /* 16MHz clock */
#else
OCR1A = 1250; /* 8MHz clock */
#endif
TIMSK1 = (1 << OCIE1A); /* Interrupt on compare match */
}
/*
* AltOS always cranks the clock to the max frequency
*/
void
ao_clock_init(void)
{
/* disable RC clock */
CLKSEL0 &= ~(1 << RCE);
/* Disable PLL */
PLLCSR &= ~(1 << PLLE);
/* Enable external clock */
CLKSEL0 |= (1 << EXTE);
/* wait for external clock to be ready */
while ((CLKSTA & (1 << EXTON)) == 0)
;
/* select external clock */
CLKSEL0 |= (1 << CLKS);
/* Disable the clock prescaler */
cli();
CLKPR = (1 << CLKPCE);
/* Always run the system clock at 8MHz */
#if AVR_CLOCK > 12000000UL
CLKPR = 1;
#else
CLKPR = 0;
#endif
sei();
/* Set up the PLL to use the crystal */
/* Use primary system clock as PLL source */
PLLFRQ = ((0 << PINMUX) | /* Use primary clock */
(0 << PLLUSB) | /* No divide by 2 for USB */
(0 << PLLTM0) | /* Disable high speed timer */
(0x4 << PDIV0)); /* 48MHz PLL clock */
/* Set the frequency of the crystal */
#if AVR_CLOCK > 12000000UL
PLLCSR |= (1 << PINDIV); /* For 16MHz crystal on Teensy board */
#else
PLLCSR &= ~(1 << PINDIV); /* For 8MHz crystal on TeleScience board */
#endif
/* Enable the PLL */
PLLCSR |= (1 << PLLE);
while (!(PLLCSR & (1 << PLOCK)))
;
set_sleep_mode(SLEEP_MODE_IDLE);
sleep_enable();
}
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