Fix various typos in boards.txt and variants.h for Ladybug; remove dead code in hooks.c

Author: GrumpyOldPizza

README.md

@@ -54,14 +54,6 @@
  1. Plugin NUCLEO board
  2. Download and install [ST-Link USB Drivers](http://www.st.com/en/embedded-software/stsw-link009.html)
 
-### Flashing the bootloader sketch for Tlera Corp Boards
-
- The Tlera Corp boards require an initial bootloader sketch. This is nothing more than a default program that contains the USB Serial device
-
- 1. Plugin STM32L4 board and toggle the RESET button while holding down the BOOT button
- 2. Select Tools -> Programmer -> STM32 BOOTLOADER
- 3. Select Tools -> Burn Bootloader
-
 ### From git (for core development)
 
  1. Follow steps from Board Manager section above
@@ -73,6 +65,10 @@
  4. Clone this repo: ```git clone https://github.com/grumpyoldpizza/arduino-STM32L4.git grumpyoldpizza/stm32l4```
  5. Restart the Arduino IDE
 
+## Recovering from a faulty sketch for Tlera Corp Boards
+
+ Sometimes a faulty sketch can render the normal USB Serial based integration into the Arduindo IDE not working. In this case plugin the STM32L4 board and toggle the RESET button while holding down the BOOT button and program a known to be working sketch to go ack to a working USB Serial setup.
+
 ## Credits
 
 This core is based on the [Arduino SAMD Core](https://github.com/arduino/ArduinoCore-samd)

boards.txt

@@ -195,7 +195,7 @@ Ladybug-L432KC.upload.native_usb=false
 
 Ladybug-L432KC.bootloader.tool=stm32l4_dfu
 Ladybug-L432KC.bootloader.protocol=dfu
-Ladybug-L432KC.bootloader.file=butterfly.bin
+Ladybug-L432KC.bootloader.file=ladybug.bin
 
 Ladybug-L432KC.build.mcu=cortex-m4
 Ladybug-L432KC.build.f_cpu=80000000L

cores/stm32l4/hooks.c

@@ -29,30 +29,3 @@ static void __empty() {
 	// Empty
 }
 void yield(void) __attribute__ ((weak, alias("__empty")));
-
-/**
- * SysTick hook
- *
- * This function is called from SysTick handler, before the default
- * handler provided by Arduino.
- */
-static int __false() {
-	// Return false
-	return 0;
-}
-int sysTickHook(void) __attribute__ ((weak, alias("__false")));
-
-/**
- * SVC hook
- * PendSV hook
- *
- * These functions are called from SVC handler, and PensSV handler.
- * Default action is halting.
- */
-static void __halt() {
-	// Halts
-	while (1)
-		;
-}
-void svcHook(void)    __attribute__ ((weak, alias("__halt")));
-void pendSVHook(void) __attribute__ ((weak, alias("__halt")));

variants/STM32L432KC-Ladybug/variant.h

@@ -100,7 +100,7 @@ static const uint8_t DAC1 = PIN_DAC1;
 
 // Other pins
 
-#define PIN_BUTTON           (44u)
+#define PIN_BUTTON           (39u)
 static const uint8_t BUTTON = PIN_BUTTON;
 
 #define PIN_ATN              (38u)