Merge branch 'master' into mm-ms5611

[fw/altos] / src / micropeak / ao_async.c

diff --git a/src/micropeak/ao_async.c b/src/micropeak/ao_async.c
new file mode 100644 (file)
index 0000000..04bba9e
--- /dev/null
+++ b/src/micropeak/ao_async.c
@@ -0,0 +1,40 @@
+/*
+ * 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_async.h>
+
+#define AO_ASYNC_BAUD  38400l
+#define AO_ASYNC_DELAY (uint8_t) (1000000l / AO_ASYNC_BAUD)
+
+void
+ao_async_byte(uint8_t byte)
+{
+       uint8_t         b;
+       uint16_t        w;
+
+       /* start bit */
+
+       /* start     data         stop */
+       w = 0x001 | (byte << 1) | 0x000;
+
+       for (b = 0; b < 10; b++) {
+               ao_led_set((w & 1) << AO_LED_SERIAL);
+               w >>= 1;
+               ao_delay_us(26);
+       }
+}