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
27 static __xdata uint8_t ao_forever;
30 ao_delay(uint16_t ticks)
33 ao_sleep(&ao_forever);
37 #define T1_CLOCK_DIVISOR 8 /* 24e6/8 = 3e6 */
38 #define T1_SAMPLE_TIME 30000 /* 3e6/30000 = 100 */
41 volatile __data uint8_t ao_adc_interval = 1;
42 volatile __data uint8_t ao_adc_count;
45 void ao_timer_isr(void) __interrupt 9
49 if (++ao_adc_count == ao_adc_interval) {
58 ao_timer_set_adc_interval(uint8_t interval) __critical
60 ao_adc_interval = interval;
68 /* NOTE: This uses a timer only present on cc1111 architecture. */
73 /* set the sample rate */
74 T1CC0H = T1_SAMPLE_TIME >> 8;
75 T1CC0L = (uint8_t) T1_SAMPLE_TIME;
77 T1CCTL0 = T1CCTL_MODE_COMPARE;
81 /* clear timer value */
84 /* enable overflow interrupt */
86 /* enable timer 1 interrupt */
89 /* enable timer 1 in module mode, dividing by 8 */
90 T1CTL = T1CTL_MODE_MODULO | T1CTL_DIV_8;
94 * AltOS always cranks the clock to the max frequency
99 /* Switch system clock to crystal oscilator */
100 CLKCON = (CLKCON & ~CLKCON_OSC_MASK) | (CLKCON_OSC_XTAL);
102 while (!(SLEEP & SLEEP_XOSC_STB))
105 /* Crank up the timer tick and system clock speed */
106 CLKCON = ((CLKCON & ~(CLKCON_TICKSPD_MASK | CLKCON_CLKSPD_MASK)) |
107 (CLKCON_TICKSPD_1 | CLKCON_CLKSPD_1));
109 while ((CLKCON & (CLKCON_TICKSPD_MASK|CLKCON_CLKSPD_MASK)) !=
110 (CLKCON_TICKSPD_1 | CLKCON_CLKSPD_1))