--- /dev/null
+/*
+ * 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) __critical
+{
+ return ao_tick_count;
+}
+
+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_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();
+ }
+#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;
+}
+
+/*
+ * AltOS always cranks the clock to the max frequency
+ */
+void
+ao_clock_init(void)
+{
+ /* Switch system clock to crystal oscilator */
+ CLKCON = (CLKCON & ~CLKCON_OSC_MASK) | (CLKCON_OSC_XTAL);
+
+ while (!(SLEEP & SLEEP_XOSC_STB))
+ ;
+
+ /* 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))
+ ;
+}