--- /dev/null
+/*
+ * Copyright © 2012 Robert D. Garbee <robert@gag.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"
+#include "ao_pwmin.h"
+
+/*
+ * This code implements a PWM input using ICP3.
+ *
+ * The initial use is to measure wind speed in the ULA/Ball summer intern
+ * project payload developed at Challenger Middle School.
+ */
+
+static void
+ao_pwmin_display(void) __reentrant
+{
+ uint8_t lo = TCNT1L;
+ uint8_t hi = TCNT1H;
+ uint16_t value = (hi <<8) | lo;
+
+ /* now display the value we read */
+ printf("timer 1: %5u", value);
+
+}
+
+__code struct ao_cmds ao_pwmin_cmds[] = {
+ { ao_pwmin_display, "p\0PWM input" },
+ { 0, NULL },
+};
+
+void
+ao_pwmin_init(void)
+{
+ /* do hardware setup here */
+ /* set the spike filter bit in the TCCR3B register */
+
+ ao_cmd_register(&ao_pwmin_cmds[0]);
+}
+
+