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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)
{
__data uint16_t ret;
__critical {
ret = ao_tick_count;
}
return ret;
}
void
ao_delay(uint16_t ticks)
{
uint16_t until = ao_time() + ticks;
while ((int16_t) (until - ao_time()) > 0)
ao_sleep(DATA_TO_XDATA(&ao_tick_count));
}
#define T1_CLOCK_DIVISOR 8 /* 24e6/8 = 3e6 */
#define T1_SAMPLE_TIME 30000 /* 3e6/30000 = 100 */
__data uint8_t ao_adc_interval = 1;
__data uint8_t ao_adc_count;
void ao_timer_isr(void) interrupt 9
{
++ao_tick_count;
if (++ao_adc_count >= ao_adc_interval) {
ao_adc_count = 0;
ao_adc_poll();
}
ao_wakeup(DATA_TO_XDATA(&ao_tick_count));
}
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 = 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;
}
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