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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"
volatile __data uint16_t ao_tick_count;
uint16_t ao_time(void) __critical
{
return ao_tick_count;
}
#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_timer_isr(void) __interrupt 9
{
++ao_tick_count;
#if HAS_ADC
if (++ao_adc_count == ao_adc_interval) {
ao_adc_count = 0;
ao_adc_poll();
#if (AO_DATA_ALL & ~(AO_DATA_ADC))
ao_wakeup(DATA_TO_XDATA(&ao_adc_count));
#endif
}
#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)
{
/* NOTE: This uses a timer only present on cc1111 architecture. */
/* disable timer 1 */
T1CTL = 0;
/* set the sample rate */
T1CC0H = T1_SAMPLE_TIME >> 8;
T1CC0L = (uint8_t) T1_SAMPLE_TIME;
T1CCTL0 = T1CCTL_MODE_COMPARE;
T1CCTL1 = 0;
T1CCTL2 = 0;
/* clear timer value */
T1CNTL = 0;
/* enable overflow interrupt */
OVFIM = 1;
/* enable timer 1 interrupt */
T1IE = 1;
/* enable timer 1 in module mode, dividing by 8 */
T1CTL = T1CTL_MODE_MODULO | T1CTL_DIV_8;
}
#ifndef NEEDS_CC1111_CLOCK_HACK
#define NEEDS_CC1111_CLOCK_HACK 1
#endif
#if NEEDS_CC1111_CLOCK_HACK
static void
ao_clock_delay(void)
{
uint16_t i = 0;
while (--i)
ao_arch_nop();
}
#endif
/*
* AltOS always cranks the clock to the max frequency
*/
void
ao_clock_init(void)
{
#if NEEDS_CC1111_CLOCK_HACK
/* Power up both oscillators */
SLEEP &= ~(SLEEP_OSC_PD);
/* Switch to the HFRC oscillator */
CLKCON = (CLKCON & ~CLKCON_OSC_MASK) | (CLKCON_OSC_RC);
/* Wait for the HFRC oscillator to be stable */
while (!(SLEEP & SLEEP_HFRC_STB))
;
/* Delay for 'a while' waiting for the crystal to
* stabilize -- the XOSC_STB bit isn't reliable
*
* http://www.ti.com/lit/er/swrz022c/swrz022c.pdf
*/
ao_clock_delay();
#endif
/* Switch system clock to crystal oscilator */
CLKCON = (CLKCON & ~CLKCON_OSC_MASK) | (CLKCON_OSC_XTAL);
/* Wait for the HFRC oscillator to be stable */
while (!(SLEEP & SLEEP_XOSC_STB))
;
/* Power down the unused HFRC oscillator */
SLEEP |= SLEEP_OSC_PD;
/* Crank up the timer tick and system clock speed */
CLKCON = ((CLKCON & ~(CLKCON_TICKSPD_MASK | CLKCON_CLKSPD_MASK)) |
(CLKCON_TICKSPD_1 | CLKCON_CLKSPD_1));
while ((CLKCON & (CLKCON_TICKSPD_MASK|CLKCON_CLKSPD_MASK)) !=
(CLKCON_TICKSPD_1 | CLKCON_CLKSPD_1))
;
}
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