altos/stm: Add AO_EXTI_MODE_PULL_NONE

This is clearer than using '0'.

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

diff --git a/src/stm/ao_exti.h b/src/stm/ao_exti.h
index 4f3e6132c44cca322e8d892249127654ec8d6e83..8aa2bdca9ad73cca16a2559ee1becd2f5c51075a 100644 (file)
--- a/src/stm/ao_exti.h
+++ b/src/stm/ao_exti.h
@@ -21,6 +21,7 @@
 
 #define AO_EXTI_MODE_RISING    1
 #define AO_EXTI_MODE_FALLING   2
+#define AO_EXTI_MODE_PULL_NONE 0
 #define AO_EXTI_MODE_PULL_UP   4
 #define AO_EXTI_MODE_PULL_DOWN 8
 #define AO_EXTI_PRIORITY_LOW   16