Changed button and exti tests to use floating input as pullup is not needed.

examples/stm32/stm32-h103/button/button.c

@@ -49,8 +49,7 @@ void button_setup(void)
 
 	/* Set GPIO0 (in GPIO port A) to 'input open-drain'. */
 	gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
-		      GPIO_CNF_INPUT_PULL_UPDOWN, GPIO0);
-	gpio_set(GPIOA, GPIO0);
+		      GPIO_CNF_INPUT_FLOAT, GPIO0);
 
 }
 

examples/stm32/stm32-h103/exti_both/exti_both.c

@@ -55,8 +55,7 @@ void exti_setup(void)
 
 	/* Set GPIO0 (in GPIO port A) to 'input open-drain'. */
 	gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
-		      GPIO_CNF_INPUT_PULL_UPDOWN, GPIO0);
-	gpio_set(GPIOA, GPIO0);
+		      GPIO_CNF_INPUT_FLOAT, GPIO0);
 
 	/* configure EXTI subsystem */
 	exti_select_source(EXTI0, GPIOA);

examples/stm32/stm32-h103/exti_rising_falling/exti_rising_falling.c

@@ -58,8 +58,7 @@ void exti_setup(void)
 
 	/* Set GPIO0 (in GPIO port A) to 'input open-drain'. */
 	gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
-		      GPIO_CNF_INPUT_PULL_UPDOWN, GPIO0);
-	gpio_set(GPIOA, GPIO0);
+		      GPIO_CNF_INPUT_FLOAT, GPIO0);
 
 	/* configure EXTI subsystem */
 	exti_select_source(EXTI0, GPIOA);