Change GPIO inherent methods back to `&self`.

With the embedded-hal rc3 update I changed them to require `&mut self`, but
in retrospect I think `&self` is better, for extra flexibility.

This PR reverts the changes from the rc3 update to inherent methods.

1 files changed, 6 insertions, 6 deletions

diff --git a/tests/stm32/src/bin/gpio.rs b/tests/stm32/src/bin/gpio.rs
index 9f1993024..c4e2fe161 100644
--- a/tests/stm32/src/bin/gpio.rs
+++ b/tests/stm32/src/bin/gpio.rs
@@ -20,10 +20,10 @@ async fn main(_spawner: Spawner) {
 
     // Test initial output
     {
-        let mut b = Input::new(&mut b, Pull::None);
+        let b = Input::new(&mut b, Pull::None);
 
         {
-            let mut a = Output::new(&mut a, Level::Low, Speed::Low);
+            let a = Output::new(&mut a, Level::Low, Speed::Low);
             delay();
             assert!(b.is_low());
             assert!(!b.is_high());
@@ -68,7 +68,7 @@ async fn main(_spawner: Spawner) {
 
     // Test input no pull
     {
-        let mut b = Input::new(&mut b, Pull::None);
+        let b = Input::new(&mut b, Pull::None);
         // no pull, the status is undefined
 
         let mut a = Output::new(&mut a, Level::Low, Speed::Low);
@@ -81,7 +81,7 @@ async fn main(_spawner: Spawner) {
 
     // Test input pulldown
     {
-        let mut b = Input::new(&mut b, Pull::Down);
+        let b = Input::new(&mut b, Pull::Down);
         delay();
         assert!(b.is_low());
 
@@ -95,7 +95,7 @@ async fn main(_spawner: Spawner) {
 
     // Test input pullup
     {
-        let mut b = Input::new(&mut b, Pull::Up);
+        let b = Input::new(&mut b, Pull::Up);
         delay();
         assert!(b.is_high());
 
@@ -109,7 +109,7 @@ async fn main(_spawner: Spawner) {
 
     // Test output open drain
     {
-        let mut b = Input::new(&mut b, Pull::Down);
+        let b = Input::new(&mut b, Pull::Down);
         // no pull, the status is undefined
 
         let mut a = OutputOpenDrain::new(&mut a, Level::Low, Speed::Low, Pull::None);