altos: Add button driver and sample user

Hook up the teleterra buttons and have them beep

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

1 files changed, 86 insertions, 0 deletions

diff --git a/src/cc1111/ao_button.c b/src/cc1111/ao_button.c
new file mode 100644
index 00000000..547d71ac
--- /dev/null
+++ b/src/cc1111/ao_button.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright © 2011 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"
+
+volatile __xdata struct ao_fifo ao_button_fifo;
+
+#define BUTTON_1_PIN	(P0_4)
+#define BUTTON_1_MASK	(1 << 4)	/* P0_4 */
+
+#define BUTTON_2_PIN	(P2_3)
+#define BUTTON_2_MASK	(1 << 3)	/* P2_3 */
+
+#define BUTTON_3_PIN	(P2_4)
+#define BUTTON_3_MASK	(1 << 4)	/* P2_4 */
+
+static void
+ao_button_insert(char n)
+{
+	ao_fifo_insert(ao_button_fifo, n);
+	ao_wakeup(&ao_button_fifo);
+}
+
+char
+ao_button_get(void) __critical
+{
+	char	b;
+
+	while (ao_fifo_empty(ao_button_fifo))
+		ao_sleep(&ao_button_fifo);
+	ao_fifo_remove(ao_button_fifo, b);
+	return b;
+}
+
+void
+ao_p2_isr(void)
+{
+	if (P2IFG & BUTTON_2_MASK)
+		ao_button_insert(2);
+	if (P2IFG & BUTTON_3_MASK)
+		ao_button_insert(3);
+	P2IFG = 0;
+}
+
+void
+ao_p0_isr(void) ao_arch_interrupt(13)
+{
+	P0IF = 0;
+	if (P0IFG & BUTTON_1_MASK)
+		ao_button_insert(1);
+	P0IFG = 0;
+}
+
+void
+ao_button_init(void)
+{
+	/* Pins are configured as inputs with pull-up by default */
+
+	/* Enable interrupts for P2_0 - P2_4
+	 * Enable interrupts for P0_4 - P0_7
+	 * Set P2 interrupts to falling edge
+	 * Set P0 interrupts to falling edge
+	 */
+	
+	PICTL |= PICTL_P2IEN | PICTL_P0IENH | PICTL_P2ICON | PICTL_P0ICON;
+
+	/* Enable interrupts for P0 inputs */
+	IEN1 |= IEN1_P0IE;
+
+	/* Enable interrupts for P2 inputs */
+	IEN2 |= IEN2_P2IE;
+}