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diff --git a/src/cc1111/ao_arch_funcs.h b/src/cc1111/ao_arch_funcs.h
new file mode 100644
index 00000000..9ad14fbb
--- /dev/null
+++ b/src/cc1111/ao_arch_funcs.h
@@ -0,0 +1,58 @@
+/*
+ * 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.
+ */
+
+/*
+ * ao_spi.c
+ */
+
+extern __xdata uint8_t	ao_spi_mutex;
+
+#define ao_spi_get_mask(reg,mask) do {\
+	ao_mutex_get(&ao_spi_mutex); \
+	(reg) &= ~(mask); \
+	} while (0)
+
+#define ao_spi_put_mask(reg,mask) do { \
+	(reg) |= (mask); \
+	ao_mutex_put(&ao_spi_mutex); \
+	} while (0)
+
+#define ao_spi_get_bit(bit) do {\
+	ao_mutex_get(&ao_spi_mutex); \
+	(bit) = 0; \
+	} while (0)
+
+#define ao_spi_put_bit(bit) do { \
+	(bit) = 1; \
+	ao_mutex_put(&ao_spi_mutex); \
+	} while (0)
+
+/*
+ * The SPI mutex must be held to call either of these
+ * functions -- this mutex covers the entire SPI operation,
+ * from chip select low to chip select high
+ */
+
+void
+ao_spi_send(void __xdata *block, uint16_t len) __reentrant;
+
+void
+ao_spi_recv(void __xdata *block, uint16_t len) __reentrant;
+
+void
+ao_spi_init(void);
+