Add GPIO header file and EFM32 Gecko Starter Kit LED support

6 files changed, 896 insertions, 4 deletions

diff --git a/nuttx/arch/arm/src/efm32/efm32_gpio.h b/nuttx/arch/arm/src/efm32/efm32_gpio.h
new file mode 100644
index 000000000..903794fbe
--- /dev/null
+++ b/nuttx/arch/arm/src/efm32/efm32_gpio.h
@@ -0,0 +1,337 @@
+/************************************************************************************
+ * arch/arm/src/efm32/efm32_gpio.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_EFM32_EFM32_GPIO_H
+#define __ARCH_ARM_SRC_EFM32_EFM32_GPIO_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+/* Configuration ********************************************************************/
+
+#if !defined(CONFIG_EFM32_GPIOA_IRQ) && !defined(CONFIG_EFM32_GPIOB_IRQ) && \
+    !defined(CONFIG_EFM32_GPIOC_IRQ) && !defined(CONFIG_EFM32_GPIOD_IRQ) && \
+    !defined(CONFIG_EFM32_GPIOE_IRQ) && !defined(CONFIG_EFM32_GPIOF_IRQ)
+#  undef CONFIG_EFM32_GPIO_IRQ
+#endif
+
+#ifndef CONFIG_DEBUG
+#  undef CONFIG_DEBUG_GPIO
+#endif
+
+#define EFM32_NGPIO                5 /* (5) GPIOA-F */
+
+/* Bit-encoded input to efm32_configgpio() *******************************************/
+
+/* 16-bit Encoding:
+ *
+ *   Input:  MMMM OII. .PPP BBBB
+ *   Output: MMMM VDD. .PPP BBBB
+ */
+
+/* Port mode:
+ *
+ *   MMMM O... .... ....
+ */
+
+#define GPIO_MODE_SHIFT            (12)        /* Bits 12-15: Port mode */
+#define GPIO_MODE_MASK             (15 << GPIO_MODE_SHIFT)
+#define GPIO_MODE_DOUT             (1 << 11)   /* DOUT input mode modifier */
+
+/* Input modes */
+
+#  define _GPIO_DISABLE            (0 << GPIO_MODE_SHIFT)
+#  define _GPIO_INPUT              (1 << GPIO_MODE_SHIFT)
+#  define _GPIO_INPUT_PULL         (2 << GPIO_MODE_SHIFT)
+#  define _GPIO_INPUT_PULL_FILTER  (3 << GPIO_MODE_SHIFT)
+
+#  define GPIO_PULLUP \
+   (_GPIO_DISABLE | GPIO_MODE_DOUT)
+#  define GPIO_INPUT \
+   _GPIO_INPUT
+#  define GPIO_INPUT_FILTER \
+   (_GPIO_INPUT | GPIO_MODE_DOUT)
+#  define GPIO_INPUT_PULLDOWN \
+   _GPIO_INPUT_PULL
+#  define GPIO_INPUT_PULLUP \
+   (_GPIO_INPUT_PULL | GPIO_MODE_DOUT)
+#  define GPIO_INPUT_PULLDOWN_FILTER \
+   _GPIO_INPUT_PULL_FILTER
+#  define GPIO_INPUT_PULLUP_FILTER \
+   (_GPIO_INPUT_PULL_FILTER | GPIO_MODE_DOUT)
+
+/* Output modes */
+
+#  define GPIO_OUTPUT_PUSHPULL \
+   (4 << GPIO_MODE_SHIFT)
+#  define GPIO_OUTPUT_PUSHPULL_DRIVE \
+   (5 << GPIO_MODE_SHIFT)
+#  define GPIO_OUTPUT_WIREDOR \
+   (6 << GPIO_MODE_SHIFT)
+#  define GPIO_OUTPUT_WIREDOR_PULLDOWN \
+   (7 << GPIO_MODE_SHIFT)
+#  define GPIO_OUTPUT_WIREDAND \
+   (8 << GPIO_MODE_SHIFT)
+#  define GPIO_OUTPUT_WIREDAND_FILTER \
+   (9 << GPIO_MODE_SHIFT)
+#  define GPIO_OUTPUT_WIREDAND_PULLUP \
+   (10 << GPIO_MODE_SHIFT)
+#  define GPIO_OUTPUT_WIREDAND_PULLUP_FILTER \
+   (11 << GPIO_MODE_SHIFT)
+#  define GPIO_OUTPUT_WIREDAND_DRIVE \
+   (12 << GPIO_MODE_SHIFT)
+#  define GPIO_OUTPUT_WIREDAND_DRIVE_FILTER \
+   (13 << GPIO_MODE_SHIFT)
+#  define GPIO_OUTPUT_WIREDAND_DRIVE_PULLUP \
+   (14 << GPIO_MODE_SHIFT)
+#  define GPIO_OUTPUT_WIREDAND_DRIVE_PULLUP_FILTER  \
+   (15 << GPIO_MODE_SHIFT)
+
+/* If the pin is an PIO output, then this identifies the initial output value:
+ *
+ *  .... V... .... ....
+ */
+
+#define GPIO_OUTPUT_SET            (1 << 11)   /* Bit 11: Initial value of output */
+#define GPIO_OUTPUT_CLEAR          (0)
+
+/* Output drive:
+ *
+ *   .... .DD. .... ....
+ */
+
+#define GPIO_DRIVE_SHIFT           (9)         /* Bits 9-10: Output drive strength */
+#define GPIO_DRIVE_MASK            (3 << GPIO_MODE_SHIFT)
+#  define GPIO_DRIVE_STANDARD      (0 << GPIO_MODE_SHIFT) /* 6 mA drive current */
+#  define GPIO_DRIVE_LOWEST        (1 << GPIO_MODE_SHIFT) /* 0.5 mA drive current */
+#  define GPIO_DRIVE_HIGH          (2 << GPIO_MODE_SHIFT) /* 20 mA drive current */
+#  define GPIO_DRIVE_LOW           (3 << GPIO_MODE_SHIFT) /* 2 mA drive current */
+
+/* Interrupt Mode (Input only):
+ *
+ *   .... .II. .... ....
+ */
+
+#define GPIO_INT_SHIFT             (9)        /* Bits 9-10: Interrupt mode */
+#define GPIO_INT_MASK              (3 << GPIO_INT_SHIFT)
+#  define GPIO_INT_RISING          (1 << GPIO_INT_SHIFT)
+#  define GPIO_INT_FALLING         (2 << GPIO_INT_SHIFT)
+#  define GPIO_INT_BOTH            (3 << GPIO_INT_SHIFT)
+
+/* This identifies the PIO port:
+ *
+ *   .... .... .PPP ....
+ */
+
+#define GPIO_PORT_SHIFT            (4)         /* Bit 4-7:  Port number */
+#define GPIO_PORT_MASK             (7 << GPIO_PORT_SHIFT)
+#  define GPIO_PORTA               (0 << GPIO_PORT_SHIFT)
+#  define GPIO_PORTB               (1 << GPIO_PORT_SHIFT)
+#  define GPIO_PORTC               (2 << GPIO_PORT_SHIFT)
+#  define GPIO_PORTD               (3 << GPIO_PORT_SHIFT)
+#  define GPIO_PORTE               (4 << GPIO_PORT_SHIFT)
+#  define GPIO_PORTF               (5 << GPIO_PORT_SHIFT)
+
+/* This identifies the pin in the port:
+ *
+ *   .... .... .... BBBB
+ */
+
+#define GPIO_PIN_SHIFT             (0)         /* Bits 0-3: Pin number: 0-15 */
+#define GPIO_PIN_MASK              (31 << GPIO_PIN_SHIFT)
+#define GPIO_PIN0                  (0  << GPIO_PIN_SHIFT)
+#define GPIO_PIN1                  (1  << GPIO_PIN_SHIFT)
+#define GPIO_PIN2                  (2  << GPIO_PIN_SHIFT)
+#define GPIO_PIN3                  (3  << GPIO_PIN_SHIFT)
+#define GPIO_PIN4                  (4  << GPIO_PIN_SHIFT)
+#define GPIO_PIN5                  (5  << GPIO_PIN_SHIFT)
+#define GPIO_PIN6                  (6  << GPIO_PIN_SHIFT)
+#define GPIO_PIN7                  (7  << GPIO_PIN_SHIFT)
+#define GPIO_PIN8                  (8  << GPIO_PIN_SHIFT)
+#define GPIO_PIN9                  (9  << GPIO_PIN_SHIFT)
+#define GPIO_PIN10                 (10 << GPIO_PIN_SHIFT)
+#define GPIO_PIN11                 (11 << GPIO_PIN_SHIFT)
+#define GPIO_PIN12                 (12 << GPIO_PIN_SHIFT)
+#define GPIO_PIN13                 (13 << GPIO_PIN_SHIFT)
+#define GPIO_PIN14                 (14 << GPIO_PIN_SHIFT)
+#define GPIO_PIN15                 (15 << GPIO_PIN_SHIFT)
+
+/************************************************************************************
+ * Public Types
+ ************************************************************************************/
+
+/* Must be big enough to hold the 16-bit encoding */
+
+typedef uint16_t gpio_pinset_t;
+
+/************************************************************************************
+ * Inline Functions
+ ************************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/************************************************************************************
+ * Public Data
+ ************************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/************************************************************************************
+ * Public Function Prototypes
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: efm32_gpioirqinitialize
+ *
+ * Description:
+ *   Initialize logic to support a second level of interrupt decoding for PIO pins.
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_EFM32_GPIO_IRQ
+void efm32_gpioirqinitialize(void);
+#else
+#  define efm32_gpioirqinitialize()
+#endif
+
+/************************************************************************************
+ * Name: efm32_configgpio
+ *
+ * Description:
+ *   Configure a PIO pin based on bit-encoded description of the pin.
+ *
+ ************************************************************************************/
+
+int efm32_configgpio(gpio_pinset_t cfgset);
+
+/************************************************************************************
+ * Name: efm32_gpiowrite
+ *
+ * Description:
+ *   Write one or zero to the selected PIO pin
+ *
+ ************************************************************************************/
+
+void efm32_gpiowrite(gpio_pinset_t pinset, bool value);
+
+/************************************************************************************
+ * Name: efm32_gpioread
+ *
+ * Description:
+ *   Read one or zero from the selected PIO pin
+ *
+ ************************************************************************************/
+
+bool efm32_gpioread(gpio_pinset_t pinset);
+
+/************************************************************************************
+ * Name: efm32_gpioirq
+ *
+ * Description:
+ *   Configure an interrupt for the specified PIO pin.
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_EFM32_GPIO_IRQ
+void efm32_gpioirq(gpio_pinset_t pinset);
+#else
+#  define efm32_gpioirq(pinset)
+#endif
+
+/************************************************************************************
+ * Name: efm32_gpioirqenable
+ *
+ * Description:
+ *   Enable the interrupt for specified PIO IRQ
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_EFM32_GPIO_IRQ
+void efm32_gpioirqenable(int irq);
+#else
+#  define efm32_gpioirqenable(irq)
+#endif
+
+/************************************************************************************
+ * Name: efm32_gpioirqdisable
+ *
+ * Description:
+ *   Disable the interrupt for specified PIO IRQ
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_EFM32_GPIO_IRQ
+void efm32_gpioirqdisable(int irq);
+#else
+#  define efm32_gpioirqdisable(irq)
+#endif
+
+/************************************************************************************
+ * Function:  efm32_dumpgpio
+ *
+ * Description:
+ *   Dump all PIO registers associated with the base address of the provided pinset.
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_DEBUG_GPIO
+int efm32_dumpgpio(uint32_t pinset, const char *msg);
+#else
+#  define efm32_dumpgpio(p,m)
+#endif
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ARCH_ARM_SRC_EFM32_EFM32_GPIO_H */
diff --git a/nuttx/configs/efm32-g8xx-stk/README.txt b/nuttx/configs/efm32-g8xx-stk/README.txt
index ed375c1c5..284f7d745 100644
--- a/nuttx/configs/efm32-g8xx-stk/README.txt
+++ b/nuttx/configs/efm32-g8xx-stk/README.txt
@@ -18,10 +18,25 @@ README
 LEDs
 ====
 
-  The EFM32 Gecko Start Kithas four yellow LEDs.  These LEDs are not used by
-  the board port unless CONFIG_ARCH_LEDS is defined.  In that case, the
-  usage by the board port is defined in include/board.h and src/efm32_autoleds.c.
-  The LEDs are used to encode OS-related events as follows:
+  The EFM32 Gecko Start Kit has four yellow LEDs.  These LEDs are connected
+  as follows:
+
+  ------------------------------------- --------------------
+  EFM32 PIN                             BOARD SIGNALS
+  ------------------------------------- --------------------
+  C0/USART1_TX#0/PCNT0_S0IN#2/ACMP0_CH0  MCU_PC0  UIF_LED0
+  C1/USART1_RX#0/PCNT0_S1IN#2/ACMP0_CH1  MCU_PC1  UIF_LED1
+  C2/USART2_TX#0/ACMP0_CH2               MCU_PC2  UIF_LED2
+  C3/USART2_RX#0/ACMP0_CH3               MCU_PC3  UIF_LED3
+  ------------------------------------- --------------------
+
+  All LEDs are grounded and so are illuminated by outputting a high
+  value to the LED.
+
+  These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
+  defined.  In that case, the usage by the board port is defined in
+  include/board.h and src/efm32_autoleds.c.  The LEDs are used to
+  encode OS-related events as follows:
 
     SYMBOL             Meaning                 LED1*  LED2   LED3   LED4
     ----------------- -----------------------  ------ -----  -----  ------
diff --git a/nuttx/configs/efm32-g8xx-stk/src/Makefile b/nuttx/configs/efm32-g8xx-stk/src/Makefile
index 49b07942c..d2503cc8b 100644
--- a/nuttx/configs/efm32-g8xx-stk/src/Makefile
+++ b/nuttx/configs/efm32-g8xx-stk/src/Makefile
@@ -37,6 +37,12 @@
 
 CSRCS = efm32_boot.c
 
+ifeq ($(CONFIG_ARCH_LEDS),y)
+CSRCS += efm32_autoleds.c
+else
+CSRCS += efm32_userleds.c
+endif
+
 COBJS = $(CSRCS:.c=$(OBJEXT))
 SRCS = $(ASRCS) $(CSRCS)
 OBJS = $(AOBJS) $(COBJS)
diff --git a/nuttx/configs/efm32-g8xx-stk/src/efm32-g8xx-stk.h b/nuttx/configs/efm32-g8xx-stk/src/efm32-g8xx-stk.h
index 21ac078a9..dd0aff5c0 100644
--- a/nuttx/configs/efm32-g8xx-stk/src/efm32-g8xx-stk.h
+++ b/nuttx/configs/efm32-g8xx-stk/src/efm32-g8xx-stk.h
@@ -41,6 +41,37 @@
  ****************************************************************************/
 
 /****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+ /* LEDs
+  *
+  * The EFM32 Gecko Start Kit has four yellow LEDs.  These LEDs are connected
+  * as follows:
+  *
+  *   ------------------------------------- --------------------
+  *   EFM32 PIN                             BOARD SIGNALS
+  *   ------------------------------------- --------------------
+  *   C0/USART1_TX#0/PCNT0_S0IN#2/ACMP0_CH0  MCU_PC0  UIF_LED0
+  *   C1/USART1_RX#0/PCNT0_S1IN#2/ACMP0_CH1  MCU_PC1  UIF_LED1
+  *   C2/USART2_TX#0/ACMP0_CH2               MCU_PC2  UIF_LED2
+  *   C3/USART2_RX#0/ACMP0_CH3               MCU_PC3  UIF_LED3
+  *   ------------------------------------- --------------------
+  *
+  * All LEDs are grounded and so are illuminated by outputting a high
+  * value to the LED.
+  */
+
+#define GPIO_LED1       (GPIO_OUTPUT_WIREDOR_PULLDOWN|\
+                         GPIO_OUTPUT_CLEAR|GPIO_PORTC|GPIO_PIN0)
+#define GPIO_LED2       (GPIO_OUTPUT_WIREDOR_PULLDOWN|\
+                         GPIO_OUTPUT_CLEAR|GPIO_PORTC|GPIO_PIN1)
+#define GPIO_LED3       (GPIO_OUTPUT_WIREDOR_PULLDOWN|\
+                         GPIO_OUTPUT_CLEAR|GPIO_PORTC|GPIO_PIN2)
+#define GPIO_LED4       (GPIO_OUTPUT_WIREDOR_PULLDOWN|\
+                         GPIO_OUTPUT_CLEAR|GPIO_PORTC|GPIO_PIN3)
+
+/****************************************************************************
  * Public Function Prototypes
  ****************************************************************************/
 
diff --git a/nuttx/configs/efm32-g8xx-stk/src/efm32_autoleds.c b/nuttx/configs/efm32-g8xx-stk/src/efm32_autoleds.c
new file mode 100644
index 000000000..a155b4a75
--- /dev/null
+++ b/nuttx/configs/efm32-g8xx-stk/src/efm32_autoleds.c
@@ -0,0 +1,258 @@
+/****************************************************************************
+ * configs/efm32-g8xx-stk/src/efm32_autoleds.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+
+#include <arch/board/board.h>
+
+#include "chip.h"
+#include "up_arch.h"
+#include "up_internal.h"
+
+#include "efm32_gpio.h"
+#include "efm32-g8xx-stk.h"
+
+#ifdef CONFIG_ARCH_LEDS
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* CONFIG_DEBUG_LEDS enables debug output from this file (needs CONFIG_DEBUG
+ * with CONFIG_DEBUG_VERBOSE too)
+ */
+
+#ifdef CONFIG_DEBUG_LEDS
+#  define leddbg  lldbg
+#  define ledvdbg llvdbg
+#else
+#  define leddbg(x...)
+#  define ledvdbg(x...)
+#endif
+
+/* The following definitions map the encoded LED setting to GPIO settings */
+
+#define EFM32F4_LED1      (1 << 0)
+#define EFM32F4_LED2      (1 << 1)
+#define EFM32F4_LED3      (1 << 2)
+#define EFM32F4_LED4      (1 << 3)
+
+#define ON_SETBITS_SHIFT  (0)
+#define ON_CLRBITS_SHIFT  (4)
+#define OFF_SETBITS_SHIFT (8)
+#define OFF_CLRBITS_SHIFT (12)
+
+#define ON_BITS(v)        ((v) & 0xff)
+#define OFF_BITS(v)       (((v) >> 8) & 0x0ff)
+#define SETBITS(b)        ((b) & 0x0f)
+#define CLRBITS(b)        (((b) >> 4) & 0x0f)
+
+#define ON_SETBITS(v)     (SETBITS(ON_BITS(v))
+#define ON_CLRBITS(v)     (CLRBITS(ON_BITS(v))
+#define OFF_SETBITS(v)    (SETBITS(OFF_BITS(v))
+#define OFF_CLRBITS(v)    (CLRBITS(OFF_BITS(v))
+
+#define LED_STARTED_ON_SETBITS       ((EFM32F4_LED1) << ON_SETBITS_SHIFT)
+#define LED_STARTED_ON_CLRBITS       ((EFM32F4_LED2|EFM32F4_LED3|EFM32F4_LED4) << ON_CLRBITS_SHIFT)
+#define LED_STARTED_OFF_SETBITS      (0 << OFF_SETBITS_SHIFT)
+#define LED_STARTED_OFF_CLRBITS      ((EFM32F4_LED1|EFM32F4_LED2|EFM32F4_LED3|EFM32F4_LED4) << OFF_CLRBITS_SHIFT)
+
+#define LED_HEAPALLOCATE_ON_SETBITS  ((EFM32F4_LED2) << ON_SETBITS_SHIFT)
+#define LED_HEAPALLOCATE_ON_CLRBITS  ((EFM32F4_LED1|EFM32F4_LED3|EFM32F4_LED4) << ON_CLRBITS_SHIFT)
+#define LED_HEAPALLOCATE_OFF_SETBITS ((EFM32F4_LED1) << OFF_SETBITS_SHIFT)
+#define LED_HEAPALLOCATE_OFF_CLRBITS ((EFM32F4_LED2|EFM32F4_LED3|EFM32F4_LED4) << OFF_CLRBITS_SHIFT)
+
+#define LED_IRQSENABLED_ON_SETBITS   ((EFM32F4_LED1|EFM32F4_LED2) << ON_SETBITS_SHIFT)
+#define LED_IRQSENABLED_ON_CLRBITS   ((EFM32F4_LED3|EFM32F4_LED4) << ON_CLRBITS_SHIFT)
+#define LED_IRQSENABLED_OFF_SETBITS  ((EFM32F4_LED2) << OFF_SETBITS_SHIFT)
+#define LED_IRQSENABLED_OFF_CLRBITS  ((EFM32F4_LED1|EFM32F4_LED3|EFM32F4_LED4) << OFF_CLRBITS_SHIFT)
+
+#define LED_STACKCREATED_ON_SETBITS  ((EFM32F4_LED3) << ON_SETBITS_SHIFT)
+#define LED_STACKCREATED_ON_CLRBITS  ((EFM32F4_LED1|EFM32F4_LED2|EFM32F4_LED4) << ON_CLRBITS_SHIFT)
+#define LED_STACKCREATED_OFF_SETBITS ((EFM32F4_LED1|EFM32F4_LED2) << OFF_SETBITS_SHIFT)
+#define LED_STACKCREATED_OFF_CLRBITS ((EFM32F4_LED3|EFM32F4_LED4) << OFF_CLRBITS_SHIFT)
+
+#define LED_INIRQ_ON_SETBITS         ((EFM32F4_LED1) << ON_SETBITS_SHIFT)
+#define LED_INIRQ_ON_CLRBITS         ((0) << ON_CLRBITS_SHIFT)
+#define LED_INIRQ_OFF_SETBITS        ((0) << OFF_SETBITS_SHIFT)
+#define LED_INIRQ_OFF_CLRBITS        ((EFM32F4_LED1) << OFF_CLRBITS_SHIFT)
+
+#define LED_SIGNAL_ON_SETBITS        ((EFM32F4_LED2) << ON_SETBITS_SHIFT)
+#define LED_SIGNAL_ON_CLRBITS        ((0) << ON_CLRBITS_SHIFT)
+#define LED_SIGNAL_OFF_SETBITS       ((0) << OFF_SETBITS_SHIFT)
+#define LED_SIGNAL_OFF_CLRBITS       ((EFM32F4_LED2) << OFF_CLRBITS_SHIFT)
+
+#define LED_ASSERTION_ON_SETBITS     ((EFM32F4_LED4) << ON_SETBITS_SHIFT)
+#define LED_ASSERTION_ON_CLRBITS     ((0) << ON_CLRBITS_SHIFT)
+#define LED_ASSERTION_OFF_SETBITS    ((0) << OFF_SETBITS_SHIFT)
+#define LED_ASSERTION_OFF_CLRBITS    ((EFM32F4_LED4) << OFF_CLRBITS_SHIFT)
+
+#define LED_PANIC_ON_SETBITS         ((EFM32F4_LED4) << ON_SETBITS_SHIFT)
+#define LED_PANIC_ON_CLRBITS         ((0) << ON_CLRBITS_SHIFT)
+#define LED_PANIC_OFF_SETBITS        ((0) << OFF_SETBITS_SHIFT)
+#define LED_PANIC_OFF_CLRBITS        ((EFM32F4_LED4) << OFF_CLRBITS_SHIFT)
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const uint16_t g_ledbits[8] =
+{
+  (LED_STARTED_ON_SETBITS       | LED_STARTED_ON_CLRBITS |
+   LED_STARTED_OFF_SETBITS      | LED_STARTED_OFF_CLRBITS),
+
+  (LED_HEAPALLOCATE_ON_SETBITS  | LED_HEAPALLOCATE_ON_CLRBITS |
+   LED_HEAPALLOCATE_OFF_SETBITS | LED_HEAPALLOCATE_OFF_CLRBITS),
+
+  (LED_IRQSENABLED_ON_SETBITS   | LED_IRQSENABLED_ON_CLRBITS |
+   LED_IRQSENABLED_OFF_SETBITS  | LED_IRQSENABLED_OFF_CLRBITS),
+
+  (LED_STACKCREATED_ON_SETBITS  | LED_STACKCREATED_ON_CLRBITS |
+   LED_STACKCREATED_OFF_SETBITS | LED_STACKCREATED_OFF_CLRBITS),
+
+  (LED_INIRQ_ON_SETBITS         | LED_INIRQ_ON_CLRBITS |
+   LED_INIRQ_OFF_SETBITS        | LED_INIRQ_OFF_CLRBITS),
+
+  (LED_SIGNAL_ON_SETBITS        | LED_SIGNAL_ON_CLRBITS |
+   LED_SIGNAL_OFF_SETBITS       | LED_SIGNAL_OFF_CLRBITS),
+
+  (LED_ASSERTION_ON_SETBITS     | LED_ASSERTION_ON_CLRBITS |
+   LED_ASSERTION_OFF_SETBITS    | LED_ASSERTION_OFF_CLRBITS),
+
+  (LED_PANIC_ON_SETBITS         | LED_PANIC_ON_CLRBITS |
+   LED_PANIC_OFF_SETBITS        | LED_PANIC_OFF_CLRBITS)
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static inline void led_clrbits(unsigned int clrbits)
+{
+  if ((clrbits & EFM32F4_LED1) != 0)
+    {
+      efm32_gpiowrite(GPIO_LED1, false);
+    }
+
+  if ((clrbits & EFM32F4_LED2) != 0)
+    {
+      efm32_gpiowrite(GPIO_LED2, false);
+    }
+
+  if ((clrbits & EFM32F4_LED3) != 0)
+    {
+      efm32_gpiowrite(GPIO_LED3, false);
+    }
+
+  if ((clrbits & EFM32F4_LED4) != 0)
+    {
+      efm32_gpiowrite(GPIO_LED4, false);
+    }
+}
+
+static inline void led_setbits(unsigned int setbits)
+{
+  if ((setbits & EFM32F4_LED1) != 0)
+    {
+      efm32_gpiowrite(GPIO_LED1, true);
+    }
+
+  if ((setbits & EFM32F4_LED2) != 0)
+    {
+      efm32_gpiowrite(GPIO_LED2, true);
+    }
+
+  if ((setbits & EFM32F4_LED3) != 0)
+    {
+      efm32_gpiowrite(GPIO_LED3, true);
+    }
+
+  if ((setbits & EFM32F4_LED4) != 0)
+    {
+      efm32_gpiowrite(GPIO_LED4, true);
+    }
+}
+
+static void led_setonoff(unsigned int bits)
+{
+  led_clrbits(CLRBITS(bits));
+  led_setbits(SETBITS(bits));
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_led_initialize
+ ****************************************************************************/
+
+void board_led_initialize(void)
+{
+   /* Configure LED1-4 GPIOs for output */
+
+   efm32_configgpio(GPIO_LED1);
+   efm32_configgpio(GPIO_LED2);
+   efm32_configgpio(GPIO_LED3);
+   efm32_configgpio(GPIO_LED4);
+}
+
+/****************************************************************************
+ * Name: board_led_on
+ ****************************************************************************/
+
+void board_led_on(int led)
+{
+  led_setonoff(ON_BITS(g_ledbits[led]));
+}
+
+/****************************************************************************
+ * Name: board_led_off
+ ****************************************************************************/
+
+void board_led_off(int led)
+{
+  led_setonoff(OFF_BITS(g_ledbits[led]));
+}
+
+#endif /* CONFIG_ARCH_LEDS */
diff --git a/nuttx/configs/efm32-g8xx-stk/src/efm32_userleds.c b/nuttx/configs/efm32-g8xx-stk/src/efm32_userleds.c
new file mode 100644
index 000000000..503e17aec
--- /dev/null
+++ b/nuttx/configs/efm32-g8xx-stk/src/efm32_userleds.c
@@ -0,0 +1,245 @@
+/****************************************************************************
+ * configs/efm32-g8xx-stk/src/efm32_userleds.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+
+#include <arch/board/board.h>
+#include <nuttx/power/pm.h>
+
+#include "chip.h"
+#include "up_arch.h"
+#include "up_internal.h"
+
+#include "efm32_gpio.h"
+#include "efm32-g8xx-stk.h"
+
+#ifndef CONFIG_ARCH_LEDS
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* CONFIG_DEBUG_LEDS enables debug output from this file (needs CONFIG_DEBUG
+ * with CONFIG_DEBUG_VERBOSE too)
+ */
+
+#ifdef CONFIG_DEBUG_LEDS
+#  define leddbg  lldbg
+#  define ledvdbg llvdbg
+#else
+#  define leddbg(x...)
+#  define ledvdbg(x...)
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+/* This array maps an LED number to GPIO pin configuration */
+
+static gpio_pinset_t g_ledcfg[BOARD_NLEDS] =
+{
+  GPIO_LED1, GPIO_LED2, GPIO_LED3, GPIO_LED4
+};
+
+/****************************************************************************
+ * Private Function Protototypes
+ ****************************************************************************/
+
+/* LED Power Management */
+
+#ifdef CONFIG_PM
+static void led_pm_notify(struct pm_callback_s *cb, enum pm_state_e pmstate);
+static int led_pm_prepare(struct pm_callback_s *cb, enum pm_state_e pmstate);
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+#ifdef CONFIG_PM
+static struct pm_callback_s g_ledscb =
+{
+  .notify  = led_pm_notify,
+  .prepare = led_pm_prepare,
+};
+#endif
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: led_pm_notify
+ *
+ * Description:
+ *   Notify the driver of new power state. This callback is called after
+ *   all drivers have had the opportunity to prepare for the new power state.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_PM
+static void led_pm_notify(struct pm_callback_s *cb , enum pm_state_e pmstate)
+{
+  switch (pmstate)
+    {
+      case(PM_NORMAL):
+        {
+          /* Restore normal LEDs operation */
+
+        }
+        break;
+
+      case(PM_IDLE):
+        {
+          /* Entering IDLE mode - Turn leds off */
+
+        }
+        break;
+
+      case(PM_STANDBY):
+        {
+          /* Entering STANDBY mode - Logic for PM_STANDBY goes here */
+
+        }
+        break;
+
+      case(PM_SLEEP):
+        {
+          /* Entering SLEEP mode - Logic for PM_SLEEP goes here */
+
+        }
+        break;
+
+      default:
+        {
+          /* Should not get here */
+
+        }
+        break;
+    }
+}
+#endif
+
+/****************************************************************************
+ * Name: led_pm_prepare
+ *
+ * Description:
+ *   Request the driver to prepare for a new power state. This is a warning
+ *   that the system is about to enter into a new power state. The driver
+ *   should begin whatever operations that may be required to enter power
+ *   state. The driver may abort the state change mode by returning a
+ *   non-zero value from the callback function.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_PM
+static int led_pm_prepare(struct pm_callback_s *cb , enum pm_state_e pmstate)
+{
+  /* No preparation to change power modes is required by the LEDs driver.
+   * We always accept the state change by returning OK.
+   */
+
+  return OK;
+}
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: efm32_ledinit
+ ****************************************************************************/
+
+void efm32_ledinit(void)
+{
+   /* Configure LED1-4 GPIOs for output */
+
+   efm32_configgpio(GPIO_LED1);
+   efm32_configgpio(GPIO_LED2);
+   efm32_configgpio(GPIO_LED3);
+   efm32_configgpio(GPIO_LED4);
+}
+
+/****************************************************************************
+ * Name: efm32_setled
+ ****************************************************************************/
+
+void efm32_setled(int led, bool ledon)
+{
+  if ((unsigned)led < BOARD_NLEDS)
+    {
+      efm32_gpiowrite(g_ledcfg[led], ledon);
+    }
+}
+
+/****************************************************************************
+ * Name: efm32_setleds
+ ****************************************************************************/
+
+void efm32_setleds(uint8_t ledset)
+{
+  efm32_gpiowrite(GPIO_LED1, (ledset & BOARD_LED1_BIT) == 0);
+  efm32_gpiowrite(GPIO_LED2, (ledset & BOARD_LED2_BIT) == 0);
+  efm32_gpiowrite(GPIO_LED3, (ledset & BOARD_LED3_BIT) == 0);
+  efm32_gpiowrite(GPIO_LED4, (ledset & BOARD_LED4_BIT) == 0);
+}
+
+/****************************************************************************
+ * Name: efm32_led_pminitialize
+ ****************************************************************************/
+
+#ifdef CONFIG_PM
+void efm32_led_pminitialize(void)
+{
+  /* Register to receive power management callbacks */
+
+  int ret = pm_register(&g_ledscb);
+  if (ret != OK)
+  {
+      board_led_on(LED_ASSERTION);
+    }
+}
+#endif /* CONFIG_PM */
+
+#endif /* !CONFIG_ARCH_LEDS */