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-rw-r--r--lib/stm32/f1/gpio.c3
-rw-r--r--lib/stm32/f2/gpio.c3
-rw-r--r--lib/stm32/f4/gpio.c3
3 files changed, 9 insertions, 0 deletions
diff --git a/lib/stm32/f1/gpio.c b/lib/stm32/f1/gpio.c
index 4f7e663..9ef6037 100644
--- a/lib/stm32/f1/gpio.c
+++ b/lib/stm32/f1/gpio.c
@@ -147,5 +147,8 @@ void gpio_port_config_lock(u32 gpioport, u16 gpios)
reg32 = GPIO_LCKR(gpioport); /* Read LCKK. */
reg32 = GPIO_LCKR(gpioport); /* Read LCKK again. */
+ /* Tell the compiler the variable is actually used. It will get optimized out anyways. */
+ reg32 = reg32;
+
/* If (reg32 & GPIO_LCKK) is true, the lock is now active. */
}
diff --git a/lib/stm32/f2/gpio.c b/lib/stm32/f2/gpio.c
index 7a38120..fc7a5b6 100644
--- a/lib/stm32/f2/gpio.c
+++ b/lib/stm32/f2/gpio.c
@@ -135,5 +135,8 @@ void gpio_port_config_lock(u32 gpioport, u16 gpios)
reg32 = GPIO_LCKR(gpioport); /* Read LCKK. */
reg32 = GPIO_LCKR(gpioport); /* Read LCKK again. */
+ /* Tell the compiler the variable is actually used. It will get optimized out anyways. */
+ reg32 = reg32;
+
/* If (reg32 & GPIO_LCKK) is true, the lock is now active. */
}
diff --git a/lib/stm32/f4/gpio.c b/lib/stm32/f4/gpio.c
index dea3720..e721f3f 100644
--- a/lib/stm32/f4/gpio.c
+++ b/lib/stm32/f4/gpio.c
@@ -135,5 +135,8 @@ void gpio_port_config_lock(u32 gpioport, u16 gpios)
reg32 = GPIO_LCKR(gpioport); /* Read LCKK. */
reg32 = GPIO_LCKR(gpioport); /* Read LCKK again. */
+ /* Tell the compiler the variable is actually used. It will get optimized out anyways. */
+ reg32 = reg32;
+
/* If (reg32 & GPIO_LCKK) is true, the lock is now active. */
}