altos: expose set of available stdio values

This lets external code manipulate which connection to communicate
over.

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

2 files changed, 5 insertions, 2 deletions

diff --git a/src/ao.h b/src/ao.h
index 64f33f0b..2d2bbf82 100644
--- a/src/ao.h
+++ b/src/ao.h
@@ -1169,6 +1169,9 @@ struct ao_stdio {
 	void	(*flush)(void);
 };
 
+extern __data int8_t ao_cur_stdio;
+extern __data int8_t ao_num_stdios;
+
 void
 flush(void);
 
diff --git a/src/ao_stdio.c b/src/ao_stdio.c
index c7080ec1..3dd457f7 100644
--- a/src/ao_stdio.c
+++ b/src/ao_stdio.c
@@ -24,8 +24,8 @@
 #define AO_NUM_STDIOS	(HAS_USB + PACKET_HAS_SLAVE + USE_SERIAL_STDIN)
 
 static __xdata struct ao_stdio stdios[AO_NUM_STDIOS];
-static __data int8_t ao_cur_stdio;
-static __data int8_t ao_num_stdios;
+__data int8_t ao_cur_stdio;
+__data int8_t ao_num_stdios;
 
 void
 putchar(char c)