Here's the button driver and event queue logic

These were neglected in the commit which was supposed to include them

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 94 insertions, 0 deletions

diff --git a/src/drivers/ao_button.c b/src/drivers/ao_button.c
new file mode 100644
index 00000000..a507c909
--- /dev/null
+++ b/src/drivers/ao_button.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright © 2012 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>
+#include <ao_button.h>
+#include <ao_exti.h>
+#if AO_EVENT
+#include <ao_event.h>
+#define ao_button_queue(b,v)	ao_event_put_isr(AO_EVENT_BUTTON, b, v)
+#else
+#define ao_button_queue(b,v)
+#endif
+
+static uint8_t		ao_button[AO_BUTTON_COUNT];
+static AO_TICK_TYPE	ao_button_time[AO_BUTTON_COUNT];
+
+#define AO_DEBOUNCE	AO_MS_TO_TICKS(20)
+
+#define port(q)	AO_BUTTON_ ## q ## _PORT
+#define bit(q) AO_BUTTON_ ## q
+#define pin(q) AO_BUTTON_ ## q ## _PIN
+
+static void
+ao_button_do(uint8_t b, uint8_t v)
+{
+	/* Debounce */
+	if ((AO_TICK_SIGNED) (ao_tick_count - ao_button_time[b]) < AO_DEBOUNCE)
+		return;
+
+	/* pins are inverted */
+	v = !v;
+	if (ao_button[b] != v) {
+		ao_button[b] = v;
+		ao_button_time[b] = ao_tick_count;
+		ao_button_queue(b, v);
+		ao_wakeup(&ao_button[b]);
+	}
+}
+
+#define ao_button_update(b)	ao_button_do(b, ao_gpio_get(port(b), bit(b), pin(b)))
+
+static void
+ao_button_isr(void)
+{
+#if AO_BUTTON_COUNT > 0
+	ao_button_update(0);
+#endif
+#if AO_BUTTON_COUNT > 1
+	ao_button_update(1);
+#endif
+#if AO_BUTTON_COUNT > 2
+	ao_button_update(2);
+#endif
+#if AO_BUTTON_COUNT > 3
+	ao_button_update(3);
+#endif
+#if AO_BUTTON_COUNT > 4
+	ao_button_update(4);
+#endif
+}
+
+#define init(b) do {							\
+		ao_enable_port(port(b));				\
+									\
+		ao_exti_setup(port(b), bit(b),				\
+			      AO_BUTTON_MODE|AO_EXTI_MODE_FALLING|AO_EXTI_MODE_RISING|AO_EXTI_PRIORITY_MED, \
+			      ao_button_isr);			\
+		ao_exti_enable(port(b), bit(b));			\
+	} while (0)
+
+void
+ao_button_init(void)
+{
+#if AO_BUTTON_COUNT > 0
+	init(0);
+#endif
+#if AO_BUTTON_COUNT > 1
+	init(1);
+#endif
+}