fix toboot_config example

examples/blink.rs

@@ -11,9 +11,12 @@ use tomu::{prelude::*, Tomu};
 fn main() -> ! {
     let mut tomu = Tomu::take().unwrap();
 
+    // constrain CMU and split into device clocks
+    // so we can enable gpio with its owned clock
     let clk_mgmt = tomu.CMU.constrain().split();
     let gpio = tomu.GPIO.split(clk_mgmt.gpio).pins();
 
+    // create tomu's led instance from gpio pin
     let leds = led::LEDs::new(gpio.pa0.into(), gpio.pb7.into());
 
     let mut red = leds.red;

examples/toboot_config.rs

@@ -13,6 +13,9 @@ use cortex_m_rt::entry;
 
 use tomu::{prelude::*, Tomu};
 
+// this will cause tomu to always enter user application,
+// short the 2 pins on the corner while inserting tomu to
+// enter bootloader.
 toboot_config! {
     config: [autorun_enable],
 }
@@ -21,8 +24,16 @@ toboot_config! {
 fn main() -> ! {
     let mut tomu = Tomu::take().unwrap();
 
-    tomu.leds.red.off();
-    tomu.leds.green.on();
+    let clk_mgmt = tomu.CMU.constrain().split();
+    let gpio = tomu.GPIO.split(clk_mgmt.gpio).pins();
+
+    let leds = led::LEDs::new(gpio.pa0.into(), gpio.pb7.into());
+
+    let mut red = leds.red;
+    let mut green = leds.green;
+
+    red.off();
+    green.on();
 
     loop {
         tomu.watchdog.feed();

src/lib.rs

@@ -118,7 +118,7 @@ pub struct Tomu {
     /// efm32 peripheral: RTC
     pub RTC: efm32::RTC,
 
-    /// efm32 periphral: SYSTICK
+    /// efm32 peripheral: SYSTICK
     pub SYST: efm32::SYST,
 
     /// efm32 peripheral: TIMER0