2 * Copyright © 2009 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20 static volatile __data uint16_t ao_tick_count;
22 uint16_t ao_time(void) __critical
28 ao_delay(uint16_t ticks)
30 uint16_t until = ao_time() + ticks;
32 while ((int16_t) (until - ao_time()) > 0)
33 ao_sleep(DATA_TO_XDATA(&ao_tick_count));
36 #define T1_CLOCK_DIVISOR 8 /* 24e6/8 = 3e6 */
37 #define T1_SAMPLE_TIME 30000 /* 3e6/30000 = 100 */
39 volatile __data uint8_t ao_adc_interval = 1;
40 volatile __data uint8_t ao_adc_count;
42 void ao_timer_isr(void) interrupt 9
45 if (++ao_adc_count == ao_adc_interval) {
49 ao_wakeup(DATA_TO_XDATA(&ao_tick_count));
53 ao_timer_set_adc_interval(uint8_t interval) __critical
55 ao_adc_interval = interval;
62 /* NOTE: This uses a timer only present on cc1111 architecture. */
67 /* set the sample rate */
68 T1CC0H = T1_SAMPLE_TIME >> 8;
69 T1CC0L = (uint8_t) T1_SAMPLE_TIME;
71 T1CCTL0 = T1CCTL_MODE_COMPARE;
75 /* clear timer value */
78 /* enable overflow interrupt */
80 /* enable timer 1 interrupt */
83 /* enable timer 1 in module mode, dividing by 8 */
84 T1CTL = T1CTL_MODE_MODULO | T1CTL_DIV_8;
88 * AltOS always cranks the clock to the max frequency
93 /* Switch system clock to crystal oscilator */
94 CLKCON = (CLKCON & ~CLKCON_OSC_MASK) | (CLKCON_OSC_XTAL);
96 while (!(SLEEP & SLEEP_XOSC_STB))
99 /* Crank up the timer tick and system clock speed */
100 CLKCON = ((CLKCON & ~(CLKCON_TICKSPD_MASK | CLKCON_CLKSPD_MASK)) |
101 (CLKCON_TICKSPD_1 | CLKCON_CLKSPD_1));
103 while ((CLKCON & (CLKCON_TICKSPD_MASK|CLKCON_CLKSPD_MASK)) !=
104 (CLKCON_TICKSPD_1 | CLKCON_CLKSPD_1))