From 1ed01dad43f95be2af258d44d03fcafde5714942 Mon Sep 17 00:00:00 2001
From: Marti Bolivar <mbolivar@leaflabs.com>
Date: Thu, 31 May 2012 18:43:18 -0400
Subject: <libmaple/gpio.h>: Fix gpio_write_bit().

It's exactly wrong -- val=0 makes the pin high, and val=1 makes it
low.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
---
 libmaple/include/libmaple/gpio.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'libmaple/include')

diff --git a/libmaple/include/libmaple/gpio.h b/libmaple/include/libmaple/gpio.h
index f7773c0..ca7b2bf 100644
--- a/libmaple/include/libmaple/gpio.h
+++ b/libmaple/include/libmaple/gpio.h
@@ -63,7 +63,7 @@ void gpio_set_mode(gpio_dev *dev, uint8 pin, gpio_pin_mode mode);
  * @param val If true, set the pin.  If false, reset the pin.
  */
 static inline void gpio_write_bit(gpio_dev *dev, uint8 pin, uint8 val) {
-    val = !!val;
+    val = !val;          /* "set" bits are lower than "reset" bits  */
     dev->regs->BSRR = BIT(pin) << (16 * val);
 }
 
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