altos: Split out SPI driver.

For TM with the companion connector, the SPI bus will be shared among
multiple devices. Split out the existing SPI code into a common
driver, with the SPI bus protected by a mutex.

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

1 files changed, 13 insertions, 0 deletions

diff --git a/src/ao.h b/src/ao.h
index 9682e42f..69f4665b 100644
--- a/src/ao.h
+++ b/src/ao.h
@@ -737,6 +737,19 @@ ao_serial_init(void);
 #endif
 
 /*
+ * ao_spi.c
+ */
+
+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);
+
+/*
  * ao_gps.c
  */