From 2433f17e7341d6afcda24d395d0b93c50a37b7b1 Mon Sep 17 00:00:00 2001 From: Gareth McMullin Date: Sat, 7 Jan 2012 18:59:18 +1300 Subject: [PATCH] Fix setting alternate port functions on the STM32F2. Thanks to Ricardo Martins. --- include/libopencm3/stm32/f2/gpio.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/libopencm3/stm32/f2/gpio.h b/include/libopencm3/stm32/f2/gpio.h index 5e0377da..1c33e445 100644 --- a/include/libopencm3/stm32/f2/gpio.h +++ b/include/libopencm3/stm32/f2/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