Add USB support.

This offers a single CDC ACM device over USB.

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

1 files changed, 18 insertions, 1 deletions

diff --git a/ao.h b/ao.h
index d3192864..7c68645c 100644
--- a/ao.h
+++ b/ao.h
@@ -25,7 +25,7 @@
 
 #define DATA_TO_XDATA(a)	((void __xdata *) ((uint8_t) (a) | 0xff00))
 
-#define AO_STACK_START	0x27
+#define AO_STACK_START	0x32
 #define AO_STACK_END	0xfe
 #define AO_STACK_SIZE	(AO_STACK_END - AO_STACK_START + 1)
 
@@ -121,4 +121,21 @@ ao_led_set(uint8_t colors);
 void
 ao_led_for(uint8_t colors, uint16_t ticks);
 
+/* ao_usb.c */
+
+void
+ao_usb_isr(void) interrupt 6;
+
+void
+ao_usb_flush(void);
+
+void
+ao_usb_putchar(uint8_t c);
+
+uint8_t
+ao_usb_getchar(void);
+
+void
+ao_usb_init(void);
+
 #endif /* _AO_H_ */