Add beep/led support.

[fw/altos] / ao_beep.c

diff --git a/ao_beep.c b/ao_beep.c
new file mode 100644 (file)
index 0000000..ae5e36a
--- /dev/null
+++ b/ao_beep.c
@@ -0,0 +1,53 @@
+/*
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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"
+
+void
+ao_beep_init(void)
+{
+       /* Our beeper is on P2_0, which is hooked to timer 4 using
+        * configuration alternative 2
+        */
+       P2_0 = 0;
+       P2SEL = (P2SEL & ~P2SEL_SELP2_0_MASK) | P2SEL_SELP2_0_GPIO;
+       PERCFG = (PERCFG & ~PERCFG_T4CFG_ALT_MASK) | PERCFG_T4CFG_ALT_2;
+       T4CCTL0 = TxCCTLy_CMP_TOGGLE|TxCCTLy_CMP_MODE_ENABLE;
+}
+
+void
+ao_beep(uint8_t beep)
+{
+       if (beep == 0) {
+               P2_0 = 0;
+               P2SEL = (P2SEL & ~P2SEL_SELP2_0_MASK) | P2SEL_SELP2_0_GPIO;
+               T4CTL = 0;
+       } else {
+               P2SEL = (P2SEL & ~P2SEL_SELP2_0_MASK) | P2SEL_SELP2_0_PERIPHERAL;
+               T4CC0 = beep;
+               T4CTL = TxCTL_DIV_32 | TxCTL_MODE_MODULO | TxCTL_START;
+       }
+}
+
+void
+ao_beep_for(uint8_t beep, uint16_t ticks)
+{
+       ao_beep(beep);
+       ao_delay(ticks);
+       ao_beep(0);
+}