Fixed LPUART and USB device initialization issue. Added _kill, _exit and _getpid functions required by gcc-arm-none-eabi-4.8 toolchain.

libraries/USBDevice/USBDevice/USBHAL_KL25Z.cpp

@@ -122,6 +122,9 @@ USBHAL::USBHAL(void) {
     epCallback[29] = &USBHAL::EP15_IN_callback;
 
 #if defined(TARGET_KL43Z)
+    // enable USBFS clock
+    SIM->SCGC4 |= SIM_SCGC4_USBFS_MASK;
+
     // enable the IRC48M clock
     USB0->CLK_RECOVER_IRC_EN |= USB_CLK_RECOVER_IRC_EN_IRC_EN_MASK;
 
@@ -130,9 +133,6 @@ USBHAL::USBHAL(void) {
 
     // choose usb src clock
     SIM->SOPT2 |= SIM_SOPT2_USBSRC_MASK;
-
-    // enable USBFS clock
-    SIM->SCGC4 |= SIM_SCGC4_USBFS_MASK;
 #else
     // choose usb src as PLL
     SIM->SOPT2 |= (SIM_SOPT2_USBSRC_MASK | SIM_SOPT2_PLLFLLSEL_MASK);

libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_KLXX/TARGET_KL43Z/TOOLCHAIN_GCC_ARM/sys.cpp

@@ -0,0 +1,32 @@
+/* mbed Microcontroller Library - stackheap
+ * Copyright (C) 2009-2011 ARM Limited. All rights reserved.
+ *
+ * Setup a fixed single stack/heap memory model,
+ *  between the top of the RW/ZI region and the stackpointer
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <sys/types.h>
+#include <errno.h>
+
+extern void exit(int return_code);
+
+int _kill(int pid, int sig) {
+    errno = EINVAL;
+    return -1;
+}
+
+void _exit(int status) {
+  exit(status);
+}
+
+int _getpid(void) {
+  return 1;
+}
+
+#ifdef __cplusplus
+}
+#endif

libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL43Z/serial_api.c

@@ -49,18 +49,27 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
 
     // enable clk
     switch (uart) {
-        case UART_0: SIM->SOPT2 |= SIM_SOPT2_LPUART0SRC(1); break;
+        case UART_0:
-        case UART_1: SIM->SOPT2 |= SIM_SOPT2_LPUART1SRC(1); break;
+          SIM->SOPT2 |= SIM_SOPT2_LPUART0SRC(1);
-        case UART_2: break;
+          SIM->SCGC5 |= SIM_SCGC5_LPUART0_MASK;
+          break;
+        case UART_1:
+          SIM->SOPT2 |= SIM_SOPT2_LPUART1SRC(1);
+          SIM->SCGC5 |= SIM_SCGC5_LPUART1_MASK;
+          break;
+        case UART_2: /* TODO: add UART2 support */ break;
     }
 
-    // Disable UART before changing registers
+    // reset UART registers
-    obj->uart->CTRL &= ~(LPUART_CTRL_RE_MASK | LPUART_CTRL_TE_MASK);
+    obj->uart->BAUD  = 0x0F000004;
+    obj->uart->STAT  = 0xC01FC000;
+    obj->uart->CTRL  = 0x00000000;
+    obj->uart->MATCH = 0x00000000;
 
     switch (uart) {
         case UART_0: obj->index = 0; break;
         case UART_1: obj->index = 1; break;
-        case UART_2: break;
+        case UART_2: /* TODO: add UART2 support */ break;
     }
 
     // set default baud rate and format
@@ -72,12 +81,8 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
     pinmap_pinout(rx, PinMap_UART_RX);
 
     // set rx/tx pins in PullUp mode
-    if (tx != NC) {
+    if (tx != NC) pin_mode(tx, PullUp);
-        pin_mode(tx, PullUp);
+    if (rx != NC) pin_mode(rx, PullUp);
-    }
-    if (rx != NC) {
-        pin_mode(rx, PullUp);
-    }
 
     obj->uart->CTRL |= (LPUART_CTRL_RE_MASK | LPUART_CTRL_TE_MASK);