examples: update blinky example to use GPIO driver

Author: astapleton

examples/blinky.rs

@@ -22,20 +22,18 @@ fn main() -> ! {
     let rcc = dp.RCC.constrain();
     let ccdr = rcc.sys_ck(250.MHz()).freeze(pwrcfg, &dp.SBS);
 
-    ccdr.peripheral.GPIOA.enable();
-
-    dp.GPIOA.moder().write(|w| w.mode5().output()); // output
-    dp.GPIOA.pupdr().write(|w| w.pupd5().pull_up()); // pull-up
+    let gpioa = dp.GPIOA.split(ccdr.peripheral.GPIOA);
+    let mut led = gpioa.pa5.into_push_pull_output();
 
     let mut delay = Delay::new(cp.SYST, &ccdr.clocks);
     let duration = SecsDurationU32::secs(1).to_millis();
 
     loop {
-        dp.GPIOA.odr().write(|w| w.od5().low());
-        delay.delay_ms(duration);
+        led.set_low();
         log::info!("Off");
-        dp.GPIOA.odr().write(|w| w.od5().high());
         delay.delay_ms(duration);
+        led.set_high();
         log::info!("On");
+        delay.delay_ms(duration);
     }
 }