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Diffstat (limited to 'include/libopencm3/stm32/f4')
-rw-r--r--include/libopencm3/stm32/f4/gpio.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/libopencm3/stm32/f4/gpio.h b/include/libopencm3/stm32/f4/gpio.h
index 4981c2a..a5b4361 100644
--- a/include/libopencm3/stm32/f4/gpio.h
+++ b/include/libopencm3/stm32/f4/gpio.h
@@ -232,7 +232,7 @@
/* See Datasheet Table 6 (pg. 48) for alternate function mappings. */
#define GPIO_AFR(n, af) (af << ((n) * 4))
-#define GPIO_AFR_MASK(n) ~(0xf << ((n) * 4))
+#define GPIO_AFR_MASK(n) (0xf << ((n) * 4))
#define GPIO_AF0 0x0
#define GPIO_AF1 0x1
#define GPIO_AF2 0x2