Merge pull request #450 from stm32-rs/clippy

clippy examples

Author: burrbull

examples/blinky-timer-irq.rs

@@ -92,6 +92,7 @@ fn main() -> ! {
         cortex_m::peripheral::NVIC::unmask(Interrupt::TIM2);
     }
 
+    #[allow(clippy::empty_loop)]
     loop {
         // Uncomment if you want to make controller sleep
         // cortex_m::asm::wfi();

examples/hd44780.rs

@@ -49,5 +49,6 @@ fn main() -> ! {
     .unwrap();
     lcd.write_str("Hello, world!", &mut delay).unwrap();
 
+    #[allow(clippy::empty_loop)]
     loop {}
 }

examples/spi_dma.rs

@@ -51,8 +51,8 @@ fn main() -> ! {
 
         let buffer = cortex_m::singleton!(: [u8; ARRAY_SIZE] = [1; ARRAY_SIZE]).unwrap();
 
-        for i in 0..ARRAY_SIZE {
-            buffer[i] = i as u8;
+        for (i, b) in buffer.iter_mut().enumerate() {
+            *b = i as u8;
         }
 
         let tx = spi2.use_dma().tx();
@@ -100,8 +100,8 @@ fn DMA2_STREAM4() {
         transfer.clear_transfer_complete_interrupt();
         unsafe {
             static mut BUFFER: [u8; ARRAY_SIZE] = [0; ARRAY_SIZE];
-            for i in 0..ARRAY_SIZE {
-                BUFFER[i] = (i + 1) as u8;
+            for (i, b) in BUFFER.iter_mut().enumerate() {
+                *b = (i + 1) as u8;
             }
             transfer.next_transfer(&mut BUFFER).unwrap();
         }