altos: Make stdio 8-bit clean by making pollchar return int

We were stealing one value (0xff) in the return value from pollchar to
indicate 'not ready yet'. Instead of doing that, use the integer value
-1 and have pollchar return an int instead of a char. That
necessitated cleaning a few other bits to make sure that 0xff wouldn't
get promoted to -1 on accident.

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

1 files changed, 0 insertions, 36 deletions

diff --git a/src/stm/ao_arch.h b/src/stm/ao_arch.h
index e270199e..007f7e2e 100644
--- a/src/stm/ao_arch.h
+++ b/src/stm/ao_arch.h
@@ -123,42 +123,6 @@ void ao_lcd_font_init(void);
 
 void ao_lcd_font_string(char *s);
 
-char
-ao_serial1_getchar(void);
-
-void
-ao_serial1_putchar(char c);
-
-char
-ao_serial1_pollchar(void);
-
-void
-ao_serial1_set_speed(uint8_t speed);
-
-char
-ao_serial2_getchar(void);
-
-void
-ao_serial2_putchar(char c);
-
-char
-ao_serial2_pollchar(void);
-
-void
-ao_serial2_set_speed(uint8_t speed);
-
-char
-ao_serial3_getchar(void);
-
-void
-ao_serial3_putchar(char c);
-
-char
-ao_serial3_pollchar(void);
-
-void
-ao_serial3_set_speed(uint8_t speed);
-
 extern const uint32_t	ao_radio_cal;
 
 void