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Posted to commits@nuttx.apache.org by ac...@apache.org on 2021/05/16 14:36:02 UTC
[incubator-nuttx] 01/02: board: Add support for Adafruit Circuit
Express
This is an automated email from the ASF dual-hosted git repository.
acassis pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git
commit 2972e7015ec6a3748eedd807b902580387d0fd86
Author: Brennan Ashton <ba...@brennanashton.com>
AuthorDate: Sat May 15 22:34:10 2021 -0700
board: Add support for Adafruit Circuit Express
---
boards/Kconfig | 12 +
boards/arm/samd2l2/circuit-express/Kconfig | 9 +
.../samd2l2/circuit-express/configs/nsh/defconfig | 64 ++++
boards/arm/samd2l2/circuit-express/include/board.h | 396 +++++++++++++++++++++
.../arm/samd2l2/circuit-express/scripts/Make.defs | 63 ++++
.../arm/samd2l2/circuit-express/scripts/flash.ld | 111 ++++++
boards/arm/samd2l2/circuit-express/src/Makefile | 37 ++
.../samd2l2/circuit-express/src/circuit_express.h | 102 ++++++
.../arm/samd2l2/circuit-express/src/sam_appinit.c | 71 ++++
.../arm/samd2l2/circuit-express/src/sam_autoleds.c | 138 +++++++
boards/arm/samd2l2/circuit-express/src/sam_boot.c | 86 +++++
.../arm/samd2l2/circuit-express/src/sam_bringup.c | 60 ++++
12 files changed, 1149 insertions(+)
diff --git a/boards/Kconfig b/boards/Kconfig
index 643ccaa..de620b1 100644
--- a/boards/Kconfig
+++ b/boards/Kconfig
@@ -92,6 +92,14 @@ config ARCH_BOARD_C5471EVM
NuttX runs on the ARM core and is built with a GNU arm-nuttx-elf toolchain*.
This port is complete and verified.
+config ARCH_BOARD_CIRCUIT_EXPRESS
+ bool "Adafruit Circuit Express"
+ depends on ARCH_CHIP_SAMD21G18A
+ select ARCH_HAVE_LEDS
+ ---help---
+ This options selects the Adafruit Circuit Express board featuring the Atmel
+ ATSAMD21 MCU.
+
config ARCH_BOARD_CLICKER2_STM32
bool "Mikroe Clicker2 STM32"
depends on ARCH_CHIP_STM32F407VG
@@ -2261,6 +2269,7 @@ config ARCH_BOARD
default "bambino-200e" if ARCH_BOARD_BAMBINO_200E
default "bl602evb" if ARCH_BOARD_BL602EVB
default "c5471evm" if ARCH_BOARD_C5471EVM
+ default "circuit-express" if ARCH_BOARD_CIRCUIT_EXPRESS
default "clicker2-stm32" if ARCH_BOARD_CLICKER2_STM32
default "cloudctrl" if ARCH_BOARD_CLOUDCTRL
default "demo9s12ne64" if ARCH_BOARD_DEMOS92S12NEC64
@@ -2713,6 +2722,9 @@ endif
if ARCH_BOARD_ARDUINO_M0
source "boards/arm/samd2l2/arduino-m0/Kconfig"
endif
+if ARCH_BOARD_CIRCUIT_EXPRESS
+source "boards/arm/samd2l2/circuit-express/Kconfig"
+endif
if ARCH_BOARD_FLIPNCLICK_SAM3X
source "boards/arm/sam34/flipnclick-sam3x/Kconfig"
endif
diff --git a/boards/arm/samd2l2/circuit-express/Kconfig b/boards/arm/samd2l2/circuit-express/Kconfig
new file mode 100644
index 0000000..4570cae
--- /dev/null
+++ b/boards/arm/samd2l2/circuit-express/Kconfig
@@ -0,0 +1,9 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+if ARCH_BOARD_CIRCUIT_EXPRESS
+
+endif
+
diff --git a/boards/arm/samd2l2/circuit-express/configs/nsh/defconfig b/boards/arm/samd2l2/circuit-express/configs/nsh/defconfig
new file mode 100644
index 0000000..9efe3d5
--- /dev/null
+++ b/boards/arm/samd2l2/circuit-express/configs/nsh/defconfig
@@ -0,0 +1,64 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_DISABLE_POSIX_TIMERS is not set
+# CONFIG_NSH_DISABLEBG is not set
+# CONFIG_NSH_DISABLESCRIPT is not set
+# CONFIG_NSH_DISABLE_CMP is not set
+# CONFIG_NSH_DISABLE_DD is not set
+# CONFIG_NSH_DISABLE_EXEC is not set
+# CONFIG_NSH_DISABLE_EXIT is not set
+# CONFIG_NSH_DISABLE_GET is not set
+# CONFIG_NSH_DISABLE_HEXDUMP is not set
+# CONFIG_NSH_DISABLE_IFCONFIG is not set
+# CONFIG_NSH_DISABLE_ITEF is not set
+# CONFIG_NSH_DISABLE_LOOPS is not set
+# CONFIG_NSH_DISABLE_LOSETUP is not set
+# CONFIG_NSH_DISABLE_MKRD is not set
+# CONFIG_NSH_DISABLE_PS is not set
+# CONFIG_NSH_DISABLE_PUT is not set
+# CONFIG_NSH_DISABLE_SEMICOLON is not set
+# CONFIG_NSH_DISABLE_WGET is not set
+# CONFIG_NSH_DISABLE_XD is not set
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="circuit-express"
+CONFIG_ARCH_BOARD_CIRCUIT_EXPRESS=y
+CONFIG_ARCH_CHIP="samd2l2"
+CONFIG_ARCH_CHIP_SAMD21G18A=y
+CONFIG_ARCH_CHIP_SAMD2X=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARD_LOOPSPERMSEC=3410
+CONFIG_BUILTIN=y
+CONFIG_DEBUG_ASSERTIONS=y
+CONFIG_DEBUG_ERROR=y
+CONFIG_DEBUG_FEATURES=y
+CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DEBUG_WARN=y
+CONFIG_DEFAULT_SMALL=y
+CONFIG_MAX_TASKS=16
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_PTHREAD_STACK_DEFAULT=1536
+CONFIG_RAM_SIZE=32768
+CONFIG_RAM_START=0x20000000
+CONFIG_RR_INTERVAL=200
+CONFIG_SAMD2L2_SERCOM4=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_SDCLONE_DISABLE=y
+CONFIG_STACK_COLORATION=y
+CONFIG_START_DAY=21
+CONFIG_START_MONTH=6
+CONFIG_START_YEAR=2015
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_TASK_SPAWN_DEFAULT_STACKSIZE=1536
+CONFIG_USART4_RXBUFSIZE=64
+CONFIG_USART4_SERIAL_CONSOLE=y
+CONFIG_USART4_TXBUFSIZE=64
+CONFIG_USERMAIN_STACKSIZE=1536
+CONFIG_USER_ENTRYPOINT="nsh_main"
diff --git a/boards/arm/samd2l2/circuit-express/include/board.h b/boards/arm/samd2l2/circuit-express/include/board.h
new file mode 100644
index 0000000..884c305
--- /dev/null
+++ b/boards/arm/samd2l2/circuit-express/include/board.h
@@ -0,0 +1,396 @@
+/****************************************************************************
+ * boards/arm/samd2l2/circuit-express/include/board.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __BOARDS_ARM_SAMD2L2_CIRCUIT_EXPRESS_INCLUDE_BOARD_H
+#define __BOARDS_ARM_SAMD2L2_CIRCUIT_EXPRESS_INCLUDE_BOARD_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#ifndef __ASSEMBLY__
+# include <stdint.h>
+# ifdef CONFIG_SAMD2L2_GPIOIRQ
+# include <arch/irq.h>
+# endif
+#endif
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Clocking *****************************************************************/
+
+/* Overview
+ *
+ * OSC8M Output = 8MHz
+ * `- GCLK1 Input = 8MHz Prescaler = 1 output = 8MHz
+ * `- DFLL Input = 8MHz Multiplier = 6 output = 48MHz
+ * `- GCLK0 Input = 48MHz Prescaler = 1 output = 48MHz
+ * `- PM Input = 48Mhz CPU divider = 1 CPU frequency = 48MHz
+ * APBA divider = 1 APBA frequency = 48MHz
+ * APBB divider = 1 APBB frequency = 48MHz
+ * APBC divider = 1 APBC frequency = 48MHz
+ *
+ */
+
+/* XOSC Configuration -- Not available
+ *
+ * BOARD_XOSC_ENABLE - Boolean (defined / not defined)
+ * BOARD_XOSC_FREQUENCY - In Hz
+ * BOARD_XOSC_STARTUPTIME - See SYSCTRL_XOSC_STARTUP_* definitions
+ * BOARD_XOSC_ISCRYSTAL - Boolean (defined / not defined)
+ * BOARD_XOSC_AMPGC - Boolean (defined / not defined)
+ * BOARD_XOSC_ONDEMAND - Boolean (defined / not defined)
+ * BOARD_XOSC_RUNINSTANDBY - Boolean (defined / not defined)
+ */
+
+#undef BOARD_XOSC_ENABLE
+#define BOARD_XOSC_FREQUENCY 12000000UL
+#define BOARD_XOSC_STARTUPTIME SYSCTRL_XOSC_STARTUP_1S
+#define BOARD_XOSC_ISCRYSTAL 1
+#define BOARD_XOSC_AMPGC 1
+#define BOARD_XOSC_ONDEMAND 1
+#undef BOARD_XOSC_RUNINSTANDBY
+
+/* XOSC32 Configuration -- Not used
+ *
+ * BOARD_XOSC32K_ENABLE - Boolean (defined / not defined)
+ * BOARD_XOSC32K_FREQUENCY - In Hz
+ * BOARD_XOSC32K_STARTUPTIME - See SYSCTRL_XOSC32K_STARTUP_* definitions
+ * BOARD_XOSC32K_ISCRYSTAL - Boolean (defined / not defined)
+ * BOARD_XOSC32K_AAMPEN - Boolean (defined / not defined)
+ * BOARD_XOSC32K_EN1KHZ - Boolean (defined / not defined)
+ * BOARD_XOSC32K_EN32KHZ - Boolean (defined / not defined)
+ * BOARD_XOSC32K_ONDEMAND - Boolean (defined / not defined)
+ * BOARD_XOSC32K_RUNINSTANDBY - Boolean (defined / not defined)
+ */
+
+#undef BOARD_XOSC32K_ENABLE
+#define BOARD_XOSC32K_FREQUENCY 32768 /* 32.768KHz XTAL */
+#define BOARD_XOSC32K_STARTUPTIME SYSCTRL_XOSC32K_STARTUP_2S
+#define BOARD_XOSC32K_ISCRYSTAL 1
+#define BOARD_XOSC32K_AAMPEN 1
+#undef BOARD_XOSC32K_EN1KHZ
+#define BOARD_XOSC32K_EN32KHZ 1
+#define BOARD_XOSC32K_ONDEMAND 1
+#undef BOARD_XOSC32K_RUNINSTANDBY
+
+/* OSC32 Configuration -- not used
+ *
+ * BOARD_OSC32K_ENABLE - Boolean (defined / not defined)
+ * BOARD_OSC32K_FREQUENCY - In Hz
+ * BOARD_OSC32K_STARTUPTIME - See SYSCTRL_OSC32K_STARTUP_* definitions
+ * BOARD_OSC32K_EN1KHZ - Boolean (defined / not defined)
+ * BOARD_OSC32K_EN32KHZ - Boolean (defined / not defined)
+ * BOARD_OSC32K_ONDEMAND - Boolean (defined / not defined)
+ * BOARD_OSC32K_RUNINSTANDBY - Boolean (defined / not defined)
+ */
+
+#undef BOARD_OSC32K_ENABLE
+#define BOARD_OSC32K_FREQUENCY 32768 /* 32.768kHz internal oscillator */
+#define BOARD_OSC32K_STARTUPTIME SYSCTRL_OSC32K_STARTUP_4MS
+#define BOARD_OSC32K_EN1KHZ 1
+#define BOARD_OSC32K_EN32KHZ 1
+#define BOARD_OSC32K_ONDEMAND 1
+#undef BOARD_OSC32K_RUNINSTANDBY
+
+/* OSC8M Configuration -- always enabled
+ *
+ * BOARD_OSC8M_PRESCALER - See SYSCTRL_OSC8M_PRESC_DIV* definitions
+ * BOARD_OSC8M_ONDEMAND - Boolean (defined / not defined)
+ * BOARD_OSC8M_RUNINSTANDBY - Boolean (defined / not defined)
+ */
+
+#define BOARD_OSC8M_PRESCALER SYSCTRL_OSC8M_PRESC_DIV1
+#define BOARD_OSC8M_ONDEMAND 1
+#undef BOARD_OSC8M_RUNINSTANDBY
+
+#define BOARD_OSC8M_FREQUENCY 8000000 /* 8MHz high-accuracy internal oscillator */
+
+/* OSCULP32K Configuration -- not used. */
+
+#define BOARD_OSCULP32K_FREQUENCY 32000 /* 32kHz ultra-low-power internal oscillator */
+
+/* Digital Frequency Locked Loop configuration. In closed-loop mode, the
+ * DFLL output frequency (Fdfll) is given by:
+ *
+ * Fdfll = DFLLmul * Frefclk
+ * = 6 * 8000000 = 48MHz
+ *
+ * Where the reference clock is Generic Clock Channel 0 output of GLCK1.
+ * GCLCK1 provides OSC8M, undivided.
+ *
+ * When operating in open-loop mode, the output frequency of the DFLL will
+ * be determined by the values written to the DFLL Coarse Value bit group
+ * and the DFLL Fine Value bit group in the DFLL Value register.
+ *
+ * BOARD_DFLL_OPENLOOP - Boolean (defined / not defined)
+ * BOARD_DFLL_TRACKAFTERFINELOCK - Boolean (defined / not defined)
+ * BOARD_DFLL_KEEPLOCKONWAKEUP - Boolean (defined / not defined)
+ * BOARD_DFLL_ENABLECHILLCYCLE - Boolean (defined / not defined)
+ * BOARD_DFLL_QUICKLOCK - Boolean (defined / not defined)
+ * BOARD_DFLL_ONDEMAND - Boolean (defined / not defined)
+ *
+ * Closed loop mode only:
+ * BOARD_DFLL_GCLKGEN - GCLK index
+ * BOARD_DFLL_MULTIPLIER - Value
+ * BOARD_DFLL_MAXCOARSESTEP - Value
+ * BOARD_DFLL_MAXFINESTEP - Value
+ *
+ * BOARD_DFLL_FREQUENCY - The resulting frequency
+ */
+
+#define BOARD_DFLL_ENABLE 1
+#define BOARD_DFLL_OPENLOOP 1
+#undef BOARD_DFLL_ONDEMAND
+#undef BOARD_DFLL_RUNINSTANDBY
+
+/* DFLL closed loop mode configuration */
+
+#define BOARD_DFLL_SRCGCLKGEN 1
+#define BOARD_DFLL_MULTIPLIER 6
+#define BOARD_DFLL_QUICKLOCK 1
+#define BOARD_DFLL_TRACKAFTERFINELOCK 1
+#define BOARD_DFLL_KEEPLOCKONWAKEUP 1
+#define BOARD_DFLL_ENABLECHILLCYCLE 1
+#define BOARD_DFLL_MAXCOARSESTEP (0x1f / 4)
+#define BOARD_DFLL_MAXFINESTEP (0xff / 4)
+
+#define BOARD_DFLL_FREQUENCY (48000000)
+
+/* GCLK Configuration
+ *
+ * Global enable/disable.
+ *
+ * BOARD_GCLK_ENABLE - Boolean (defined / not defined)
+ *
+ * For n=1-7:
+ * BOARD_GCLKn_ENABLE - Boolean (defined / not defined)
+ *
+ * For n=0-8:
+ * BOARD_GCLKn_RUN_IN_STANDBY - Boolean (defined / not defined)
+ * BOARD_GCLKn_CLOCK_SOURCE - See GCLK_GENCTRL_SRC_* definitions
+ * BOARD_GCLKn_PRESCALER - Value
+ * BOARD_GCLKn_OUTPUT_ENABLE - Boolean (defined / not defined)
+ */
+
+#define BOARD_GCLK_ENABLE 1
+
+/* GCLK generator 0 (Main Clock) - Source is the DFLL */
+
+#undef BOARD_GCLK0_RUN_IN_STANDBY
+#define BOARD_GCLK0_CLOCK_SOURCE GCLK_GENCTRL_SRC_DFLL48M
+#define BOARD_GCLK0_PRESCALER 1
+#undef BOARD_GCLK0_OUTPUT_ENABLE
+#define BOARD_GCLK0_FREQUENCY (BOARD_DFLL_FREQUENCY / BOARD_GCLK0_PRESCALER)
+
+/* Configure GCLK generator 1 - Drives the DFLL */
+
+#define BOARD_GCLK1_ENABLE 1
+#undef BOARD_GCLK1_RUN_IN_STANDBY
+#define BOARD_GCLK1_CLOCK_SOURCE GCLK_GENCTRL_SRC_OSC8M
+#define BOARD_GCLK1_PRESCALER 1
+#undef BOARD_GCLK1_OUTPUT_ENABLE
+#define BOARD_GCLK1_FREQUENCY (BOARD_OSC8M_FREQUENCY / BOARD_GCLK1_PRESCALER)
+
+/* Configure GCLK generator 2 (RTC) */
+
+#undef BOARD_GCLK2_ENABLE
+#undef BOARD_GCLK2_RUN_IN_STANDBY
+#define BOARD_GCLK2_CLOCK_SOURCE GCLK_GENCTRL_SRC_OSC32K
+#define BOARD_GCLK2_PRESCALER 32
+#undef BOARD_GCLK2_OUTPUT_ENABLE
+#define BOARD_GCLK2_FREQUENCY (BOARD_OSC8M_FREQUENCY / BOARD_GCLK2_PRESCALER)
+
+/* Configure GCLK generator 3 */
+
+#undef BOARD_GCLK3_ENABLE
+#undef BOARD_GCLK3_RUN_IN_STANDBY
+#define BOARD_GCLK3_CLOCK_SOURCE GCLK_GENCTRL_SRC_OSC8M
+#define BOARD_GCLK3_PRESCALER 1
+#undef BOARD_GCLK3_OUTPUT_ENABLE
+#define BOARD_GCLK3_FREQUENCY (BOARD_OSC8M_FREQUENCY / BOARD_GCLK3_PRESCALER)
+
+/* Configure GCLK generator 4 */
+
+#undef BOARD_GCLK4_ENABLE
+#undef BOARD_GCLK4_RUN_IN_STANDBY
+#define BOARD_GCLK4_CLOCK_SOURCE GCLK_GENCTRL_SRC_OSC8M
+#define BOARD_GCLK4_PRESCALER 1
+#undef BOARD_GCLK4_OUTPUT_ENABLE
+#define BOARD_GCLK4_FREQUENCY (BOARD_OSC8M_FREQUENCY / BOARD_GCLK4_PRESCALER)
+
+/* Configure GCLK generator 5 */
+
+#undef BOARD_GCLK5_ENABLE
+#undef BOARD_GCLK5_RUN_IN_STANDBY
+#define BOARD_GCLK5_CLOCK_SOURCE GCLK_GENCTRL_SRC_OSC8M
+#define BOARD_GCLK5_PRESCALER 1
+#undef BOARD_GCLK5_OUTPUT_ENABLE
+#define BOARD_GCLK5_FREQUENCY (BOARD_OSC8M_FREQUENCY / BOARD_GCLK5_PRESCALER)
+
+/* Configure GCLK generator 6 */
+
+#undef BOARD_GCLK6_ENABLE
+#undef BOARD_GCLK6_RUN_IN_STANDBY
+#define BOARD_GCLK6_CLOCK_SOURCE GCLK_GENCTRL_SRC_OSC8M
+#define BOARD_GCLK6_PRESCALER 1
+#undef BOARD_GCLK6_OUTPUT_ENABLE
+#define BOARD_GCLK6_FREQUENCY (BOARD_OSC8M_FREQUENCY / BOARD_GCLK6_PRESCALER)
+
+/* Configure GCLK generator 7 */
+
+#undef BOARD_GCLK7_ENABLE
+#undef BOARD_GCLK7_RUN_IN_STANDBY
+#define BOARD_GCLK7_CLOCK_SOURCE GCLK_GENCTRL_SRC_OSC8M
+#define BOARD_GCLK7_PRESCALER 1
+#undef BOARD_GCLK7_OUTPUT_ENABLE
+#define BOARD_GCLK7_FREQUENCY (BOARD_OSC8M_FREQUENCY / BOARD_GCLK7_PRESCALER)
+
+/* The source of the main clock is always GCLK_MAIN. Also called GCLKGEN[0],
+ * this is the clock feeding the Power Manager.
+ * The Power Manager, in turn, generates main clock which is divided down to
+ * produce the CPU, AHB, and APB clocks.
+ *
+ * The main clock is initially OSC8M divided by 8.
+ */
+
+#define BOARD_GCLK_MAIN_FREQUENCY BOARD_GCLK0_FREQUENCY
+
+/* Main clock dividers
+ *
+ * BOARD_CPU_DIVIDER - See PM_CPUSEL_CPUDIV_* definitions
+ * BOARD_CPU_FRQUENCY - In Hz
+ * BOARD_CPU_FAILDECT - Boolean (defined / not defined)
+ * BOARD_APBA_DIVIDER - See M_APBASEL_APBADIV_* definitions
+ * BOARD_APBA_FRQUENCY - In Hz
+ * BOARD_APBB_DIVIDER - See M_APBBSEL_APBBDIV_* definitions
+ * BOARD_APBB_FRQUENCY - In Hz
+ * BOARD_APBC_DIVIDER - See M_APBCSEL_APBCDIV_* definitions
+ * BOARD_APBC_FRQUENCY - In Hz
+ */
+
+#define BOARD_CPU_FAILDECT 1
+#define BOARD_CPU_DIVIDER PM_CPUSEL_CPUDIV_1
+#define BOARD_APBA_DIVIDER PM_APBASEL_APBADIV_1
+#define BOARD_APBB_DIVIDER PM_APBBSEL_APBBDIV_1
+#define BOARD_APBC_DIVIDER PM_APBCSEL_APBCDIV_1
+
+/* Resulting frequencies */
+
+#define BOARD_MCK_FREQUENCY (BOARD_GCLK_MAIN_FREQUENCY)
+#define BOARD_CPU_FREQUENCY (BOARD_MCK_FREQUENCY)
+#define BOARD_PBA_FREQUENCY (BOARD_MCK_FREQUENCY)
+#define BOARD_PBB_FREQUENCY (BOARD_MCK_FREQUENCY)
+#define BOARD_PBC_FREQUENCY (BOARD_MCK_FREQUENCY)
+#define BOARD_PBD_FREQUENCY (BOARD_MCK_FREQUENCY)
+
+/* FLASH wait states
+ *
+ * Vdd Range Wait states Maximum Operating Frequency
+ * ------------- -------------- ---------------------------
+ * 1.62V to 2.7V 0 14 MHz
+ * 1 28 MHz
+ * 2 42 MHz
+ * 3 48 MHz
+ * 2.7V to 3.63V 0 24 MHz
+ * 1 48 MHz
+ */
+
+#if 0 /* REVISIT -- should not be necessary */
+# define BOARD_FLASH_WAITSTATES 1
+#else
+# define BOARD_FLASH_WAITSTATES 2
+#endif
+
+/* SERCOM definitions *******************************************************/
+
+/* This is the source clock generator for the GCLK_SERCOM_SLOW clock that is
+ * common to all SERCOM modules.
+ */
+
+#define BOARD_SERCOM05_SLOW_GCLKGEN 0
+
+/* SERCOM5 USART used to Serial Console
+ *
+ * PIN PORT SERCOM FUNCTION
+ * --- ------------------ -----------
+ * 7 PB08 SERCOM4 PAD0 USART TXD
+ * 8 PB09 SERCOM4 PAD1 USART RXD
+ */
+
+#define BOARD_SERCOM4_GCLKGEN 0
+#define BOARD_SERCOM4_SLOW_GCLKGEN BOARD_SERCOM05_SLOW_GCLKGEN
+#define BOARD_SERCOM4_MUXCONFIG (USART_CTRLA_RXPAD1 | USART_CTRLA_TXPAD0_1)
+#define BOARD_SERCOM4_PINMAP_PAD0 PORT_SERCOM4_PAD0_3 /* USART 4 TXD */
+#define BOARD_SERCOM4_PINMAP_PAD1 PORT_SERCOM4_PAD1_3 /* USART 4 RXD */
+#define BOARD_SERCOM4_PINMAP_PAD2 0
+#define BOARD_SERCOM4_PINMAP_PAD3 0
+
+#define BOARD_SERCOM4_FREQUENCY BOARD_GCLK0_FREQUENCY
+
+/* LED definitions **********************************************************/
+
+/* There are 2 LEDs on board the Adafruit Circuit Express board in addition
+ * to the neopixel LEDs.
+ * The power ON LED which is connected to the 3.3V rail.
+ * D13 which is an active high user status LED.
+ *
+ * This user LED is controlled by PA17.
+ */
+
+/* LED index values for use with board_userled() */
+
+#define BOARD_STATUS_LED 0
+#define BOARD_NLEDS 1
+
+/* LED bits for use with board_userled_all() */
+
+#define BOARD_STATUS LED_BIT (1 << BOARD_STATUS_LED)
+
+/* When CONFIG_ARCH_LEDS is defined in the NuttX configuration, NuttX will
+ * control the LED as defined below. Thus if the LED is statically on, NuttX
+ * has successfully booted and is, apparently, running normally.
+ * If the LED is flashing at approximately 2Hz, then a fatal error
+ * has been detected and the system has halted.
+ */
+
+#define LED_STARTED 0 /* STATUS LED=OFF */
+#define LED_HEAPALLOCATE 0 /* STATUS LED=OFF */
+#define LED_IRQSENABLED 0 /* STATUS LED=OFF */
+#define LED_STACKCREATED 1 /* STATUS LED=ON */
+#define LED_INIRQ 2 /* STATUS LED=no change */
+#define LED_SIGNAL 2 /* STATUS LED=no change */
+#define LED_ASSERTION 2 /* STATUS LED=no change */
+#define LED_PANIC 3 /* STATUS LED=flashing */
+
+/* Button definitions *******************************************************/
+
+/* Mechanical buttons:
+ *
+ * The Adafruit Circuit Express contains 2 mechanical buttons and a switch.
+ */
+
+#define NUM_BUTTONS 3
+
+#endif /* __BOARDS_ARM_SAMD2L2_CIRCUIT_EXPRESS_INCLUDE_BOARD_H */
diff --git a/boards/arm/samd2l2/circuit-express/scripts/Make.defs b/boards/arm/samd2l2/circuit-express/scripts/Make.defs
new file mode 100644
index 0000000..dca3c45
--- /dev/null
+++ b/boards/arm/samd2l2/circuit-express/scripts/Make.defs
@@ -0,0 +1,63 @@
+############################################################################
+# boards/arm/samd2l2/circuit-express/scripts/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership. The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(TOPDIR)/.config
+include $(TOPDIR)/tools/Config.mk
+include $(TOPDIR)/arch/arm/src/armv6-m/Toolchain.defs
+
+LDSCRIPT = flash.ld
+
+ifeq ($(CONFIG_CYGWIN_WINTOOL),y)
+ ARCHSCRIPT = -T "${shell cygpath -w $(BOARD_DIR)$(DELIM)scripts$(DELIM)$(LDSCRIPT)}"
+else
+ ARCHSCRIPT = -T$(BOARD_DIR)$(DELIM)scripts$(DELIM)$(LDSCRIPT)
+endif
+
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+ ARCHOPTIMIZATION = -g
+endif
+
+ifneq ($(CONFIG_DEBUG_NOOPT),y)
+ ARCHOPTIMIZATION += $(MAXOPTIMIZATION) -fno-strict-aliasing -fno-strength-reduce -fomit-frame-pointer
+endif
+
+ARCHCFLAGS = -fno-builtin
+ARCHCXXFLAGS = -fno-builtin -fno-exceptions -fcheck-new -fno-rtti
+ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -Wundef
+ARCHWARNINGSXX = -Wall -Wshadow -Wundef
+ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10
+
+CFLAGS := $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
+CPICFLAGS = $(ARCHPICFLAGS) $(CFLAGS)
+CXXFLAGS := $(ARCHCXXFLAGS) $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
+CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
+CPPFLAGS := $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS)
+AFLAGS := $(CFLAGS) -D__ASSEMBLY__
+
+NXFLATLDFLAGS1 = -r -d -warn-common
+NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-pcrel.ld -no-check-sections
+LDNXFLATFLAGS = -e main -s 2048
+
+ifneq ($(CROSSDEV),arm-nuttx-elf-)
+ LDFLAGS += -nostartfiles -nodefaultlibs
+endif
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+ LDFLAGS += -g
+endif
diff --git a/boards/arm/samd2l2/circuit-express/scripts/flash.ld b/boards/arm/samd2l2/circuit-express/scripts/flash.ld
new file mode 100644
index 0000000..04c873d
--- /dev/null
+++ b/boards/arm/samd2l2/circuit-express/scripts/flash.ld
@@ -0,0 +1,111 @@
+/****************************************************************************
+ * boards/arm/samd2l2/circuit-express/scripts/flash.ld
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/* The ATSAMD21G18A has 256KB of FLASH beginning at address 0x0000:0000 and
+ * 32KB of SRAM beginning at address 0x2000:0000
+ */
+
+MEMORY
+{
+ flash (rx) : ORIGIN = 0x00000000, LENGTH = 256K
+ sram (rwx) : ORIGIN = 0x20000000, LENGTH = 32K
+}
+
+OUTPUT_ARCH(arm)
+EXTERN(_vectors)
+ENTRY(_stext)
+
+SECTIONS
+{
+ .text : {
+ _stext = ABSOLUTE(.);
+ *(.vectors)
+ *(.text .text.*)
+ *(.fixup)
+ *(.gnu.warning)
+ *(.rodata .rodata.*)
+ *(.gnu.linkonce.t.*)
+ *(.glue_7)
+ *(.glue_7t)
+ *(.got)
+ *(.gcc_except_table)
+ *(.gnu.linkonce.r.*)
+ _etext = ABSOLUTE(.);
+ } > flash
+
+ .init_section : {
+ _sinit = ABSOLUTE(.);
+ *(.init_array .init_array.*)
+ _einit = ABSOLUTE(.);
+ } > flash
+
+ .ARM.extab : {
+ *(.ARM.extab*)
+ } >flash
+
+ .ARM.exidx : {
+ __exidx_start = ABSOLUTE(.);
+ *(.ARM.exidx*)
+ __exidx_end = ABSOLUTE(.);
+ } >flash
+
+ .data : {
+ _sdata = ABSOLUTE(.);
+ *(.data .data.*)
+ *(.gnu.linkonce.d.*)
+ CONSTRUCTORS
+ . = ALIGN(4);
+ _edata = ABSOLUTE(.);
+ } > sram AT > flash
+
+ _eronly = LOADADDR(.data);
+
+ .ramfunc ALIGN(4): {
+ _sramfuncs = ABSOLUTE(.);
+ *(.ramfunc .ramfunc.*)
+ _eramfuncs = ABSOLUTE(.);
+ } > sram AT > flash
+
+ _framfuncs = LOADADDR(.ramfunc);
+
+ .bss : {
+ _sbss = ABSOLUTE(.);
+ *(.bss .bss.*)
+ *(.gnu.linkonce.b.*)
+ *(COMMON)
+ . = ALIGN(4);
+ _ebss = ABSOLUTE(.);
+ } > sram
+
+ /* Stabs debugging sections. */
+
+ .stab 0 : { *(.stab) }
+ .stabstr 0 : { *(.stabstr) }
+ .stab.excl 0 : { *(.stab.excl) }
+ .stab.exclstr 0 : { *(.stab.exclstr) }
+ .stab.index 0 : { *(.stab.index) }
+ .stab.indexstr 0 : { *(.stab.indexstr) }
+ .comment 0 : { *(.comment) }
+ .debug_abbrev 0 : { *(.debug_abbrev) }
+ .debug_info 0 : { *(.debug_info) }
+ .debug_line 0 : { *(.debug_line) }
+ .debug_pubnames 0 : { *(.debug_pubnames) }
+ .debug_aranges 0 : { *(.debug_aranges) }
+}
diff --git a/boards/arm/samd2l2/circuit-express/src/Makefile b/boards/arm/samd2l2/circuit-express/src/Makefile
new file mode 100644
index 0000000..8024baf
--- /dev/null
+++ b/boards/arm/samd2l2/circuit-express/src/Makefile
@@ -0,0 +1,37 @@
+############################################################################
+# boards/arm/samd2l2/circuit-express/src/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership. The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(TOPDIR)/Make.defs
+
+CSRCS = sam_boot.c sam_bringup.c
+
+ifeq ($(CONFIG_ARCH_LEDS),y)
+CSRCS += sam_autoleds.c
+endif
+
+ifeq ($(CONFIG_ARCH_BUTTONS),y)
+CSRCS += sam_buttons.c
+endif
+
+ifeq ($(CONFIG_LIB_BOARDCTL),y)
+CSRCS += sam_appinit.c
+endif
+
+include $(TOPDIR)/boards/Board.mk
diff --git a/boards/arm/samd2l2/circuit-express/src/circuit_express.h b/boards/arm/samd2l2/circuit-express/src/circuit_express.h
new file mode 100644
index 0000000..6967e17
--- /dev/null
+++ b/boards/arm/samd2l2/circuit-express/src/circuit_express.h
@@ -0,0 +1,102 @@
+/****************************************************************************
+ * boards/arm/samd2l2/circuit-express/src/circuit_express.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __BOARDS_ARM_SAMD2L2_CIRCUIT_EXPRESS_SRC_CIRCUIT_EXPRESS_H
+#define __BOARDS_ARM_SAMD2L2_CIRCUIT_EXPRESS_SRC_CIRCUIT_EXPRESS_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <stdint.h>
+
+#include <arch/irq.h>
+#include <nuttx/irq.h>
+
+#include "sam_config.h"
+#include "sam_pinmap.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* LEDs:
+ * There is a LED on board the Circuit Express board.
+ *
+ * This LED is controlled by PA17 and the LED can be activated by driving
+ * PA17 to High.
+ *
+ * When CONFIG_ARCH_LEDS is defined in the NuttX configuration, NuttX will
+ * control the LED as follows:
+ *
+ * SYMBOL Meaning LED
+ * ------------------- ----------------------- ------
+ * LED_STARTED NuttX has been started OFF
+ * LED_HEAPALLOCATE Heap has been allocated OFF
+ * LED_IRQSENABLED Interrupts enabled OFF
+ * LED_STACKCREATED Idle stack created ON
+ * LED_INIRQ In an interrupt N/C
+ * LED_SIGNAL In a signal handler N/C
+ * LED_ASSERTION An assertion failed N/C
+ * LED_PANIC The system has crashed FLASH
+ *
+ * Thus if the LED is statically on, NuttX has successfully booted and is,
+ * apparently, running normally. If the LED is flashing at approximately
+ * 2Hz, then a fatal error has been detected and the system has halted.
+ */
+
+#define PORT_STATUS_LED (PORT_OUTPUT | PORT_PULL_NONE | PORT_OUTPUT_SET | \
+ PORTA | PORT_PIN17)
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/****************************************************************************
+ * Public Functions Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_bringup
+ *
+ * Description:
+ * Perform architecture-specific initialization
+ *
+ * CONFIG_BOARD_LATE_INITIALIZE=y :
+ * Called from board_late_initialize().
+ *
+ * CONFIG_BOARD_LATE_INITIALIZE=y && CONFIG_LIB_BOARDCTL=y :
+ * Called from the NSH library
+ *
+ ****************************************************************************/
+
+int sam_bringup(void);
+
+#endif /* __ASSEMBLY__ */
+#endif /* __BOARDS_ARM_SAMD2L2_CIRCUIT_EXPRESS_SRC_CIRCUIT_EXPRESS_H */
diff --git a/boards/arm/samd2l2/circuit-express/src/sam_appinit.c b/boards/arm/samd2l2/circuit-express/src/sam_appinit.c
new file mode 100644
index 0000000..7730356
--- /dev/null
+++ b/boards/arm/samd2l2/circuit-express/src/sam_appinit.c
@@ -0,0 +1,71 @@
+/****************************************************************************
+ * boards/arm/samd2l2/circuit-express/src/sam_appinit.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <syslog.h>
+
+#include <nuttx/board.h>
+
+#include "sam_config.h"
+#include "circuit_express.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_app_initialize
+ *
+ * Description:
+ * Perform application specific initialization. This function is never
+ * called directly from application code, but only indirectly via the
+ * (non-standard) boardctl() interface using the command BOARDIOC_INIT.
+ *
+ * Input Parameters:
+ * arg - The boardctl() argument is passed to the board_app_initialize()
+ * implementation without modification. The argument has no
+ * meaning to NuttX; the meaning of the argument is a contract
+ * between the board-specific initialization logic and the
+ * matching application logic. The value could be such things as a
+ * mode enumeration value, a set of DIP switch switch settings, a
+ * pointer to configuration data read from a file or serial FLASH,
+ * or whatever you would like to do with it. Every implementation
+ * should accept zero/NULL as a default configuration.
+ *
+ * Returned Value:
+ * Zero (OK) is returned on success; a negated errno value is returned on
+ * any failure to indicate the nature of the failure.
+ *
+ ****************************************************************************/
+
+int board_app_initialize(uintptr_t arg)
+{
+ return OK;
+}
diff --git a/boards/arm/samd2l2/circuit-express/src/sam_autoleds.c b/boards/arm/samd2l2/circuit-express/src/sam_autoleds.c
new file mode 100644
index 0000000..273a3e0
--- /dev/null
+++ b/boards/arm/samd2l2/circuit-express/src/sam_autoleds.c
@@ -0,0 +1,138 @@
+/****************************************************************************
+ * boards/arm/samd2l2/circuit-express/src/sam_autoleds.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/* There is a LED on board the Circuit Express board.
+ *
+ * When CONFIG_ARCH_LEDS is defined in the NuttX configuration, NuttX will
+ * control the LED as follows:
+ *
+ * SYMBOL Meaning LED
+ * ------------------- ----------------------- ------
+ * LED_STARTED NuttX has been started OFF
+ * LED_HEAPALLOCATE Heap has been allocated OFF
+ * LED_IRQSENABLED Interrupts enabled OFF
+ * LED_STACKCREATED Idle stack created ON
+ * LED_INIRQ In an interrupt** N/C
+ * LED_SIGNAL In a signal handler*** N/C
+ * LED_ASSERTION An assertion failed N/C
+ * LED_PANIC The system has crashed FLASH
+ *
+ * Thus if the LED is statically on, NuttX has successfully booted and is,
+ * apparently, running normally. If the LED is flashing at approximately
+ * 2Hz, then a fatal error has been detected and the system has halted.
+ */
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+
+#include <nuttx/board.h>
+#include <arch/board/board.h>
+
+#include "sam_port.h"
+#include "circuit_express.h"
+
+#ifdef CONFIG_ARCH_LEDS
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_autoled_initialize
+ ****************************************************************************/
+
+void board_autoled_initialize(void)
+{
+ sam_configport(PORT_STATUS_LED);
+}
+
+/****************************************************************************
+ * Name: board_autoled_on
+ ****************************************************************************/
+
+void board_autoled_on(int led)
+{
+ switch (led)
+ {
+ case 0: /* LED_STARTED: NuttX has been started STATUS LED=OFF
+ * LED_HEAPALLOCATE: Heap has been allocated STATUS LED=OFF
+ * LED_IRQSENABLED: Interrupts enabled STATUS LED=OFF
+ */
+
+ break; /* Leave ledstate == true to turn OFF */
+
+ default:
+ case 2: /* LED_INIRQ: In an interrupt STATUS LED=N/C
+ * LED_SIGNAL: In a signal handler STATUS LED=N/C
+ * LED_ASSERTION: An assertion failed STATUS LED=N/C
+ */
+
+ return; /* Return to leave STATUS LED unchanged */
+
+ case 3: /* LED_PANIC: The system has crashed STATUS LED=FLASH */
+ case 1: /* LED_STACKCREATED: Idle stack created STATUS LED=ON */
+ sam_portwrite(PORT_STATUS_LED, true);
+ break;
+ }
+}
+
+/****************************************************************************
+ * Name: board_autoled_off
+ ****************************************************************************/
+
+void board_autoled_off(int led)
+{
+ switch (led)
+ {
+ /* These should not happen and are ignored */
+
+ default:
+ case 0: /* LED_STARTED: NuttX has been started STATUS LED=OFF
+ * LED_HEAPALLOCATE: Heap has been allocated STATUS LED=OFF
+ * LED_IRQSENABLED: Interrupts enabled STATUS LED=OFF
+ */
+
+ case 1: /* LED_STACKCREATED: Idle stack created STATUS LED=ON */
+
+ /* These result in no-change */
+
+ case 2: /* LED_INIRQ: In an interrupt STATUS LED=N/C
+ * LED_SIGNAL: In a signal handler STATUS LED=N/C
+ * LED_ASSERTION: An assertion failed STATUS LED=N/C
+ */
+
+ return; /* Return to leave STATUS LED unchanged */
+
+ /* Turn STATUS LED off set driving the output high */
+
+ case 3: /* LED_PANIC: The system has crashed STATUS LED=FLASH */
+ sam_portwrite(PORT_STATUS_LED, false);
+ break;
+ }
+}
+
+#endif /* CONFIG_ARCH_LEDS */
diff --git a/boards/arm/samd2l2/circuit-express/src/sam_boot.c b/boards/arm/samd2l2/circuit-express/src/sam_boot.c
new file mode 100644
index 0000000..e45589e
--- /dev/null
+++ b/boards/arm/samd2l2/circuit-express/src/sam_boot.c
@@ -0,0 +1,86 @@
+/****************************************************************************
+ * boards/arm/samd2l2/circuit-express/src/sam_boot.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+
+#include <nuttx/board.h>
+
+#include "sam_config.h"
+#include "circuit_express.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_boardinitialize
+ *
+ * Description:
+ * All SAMD21 architectures must provide the following entry point.
+ * This entry point is called early in the initialization -- after all
+ * memory has been configured and mapped but before any devices have been
+ * initialized.
+ *
+ ****************************************************************************/
+
+void sam_boardinitialize(void)
+{
+ /* Configure on-board LEDs if LED support has been selected. */
+
+#ifdef CONFIG_ARCH_LEDS
+ board_autoled_initialize();
+#endif
+}
+
+/****************************************************************************
+ * Name: board_late_initialize
+ *
+ * Description:
+ * If CONFIG_BOARD_LATE_INITIALIZE is selected, then an additional
+ * initialization call will be performed in the boot-up sequence to a
+ * function called board_late_initialize(). board_late_initialize() will be
+ * called immediately after up_intitialize() is called and just before the
+ * initial application is started. This additional initialization phase
+ * may be used, for example, to initialize board-specific device drivers.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_BOARD_LATE_INITIALIZE
+void board_late_initialize(void)
+{
+ /* Perform board initialization */
+
+ (void)sam_bringup();
+}
+#endif /* CONFIG_BOARD_LATE_INITIALIZE */
diff --git a/boards/arm/samd2l2/circuit-express/src/sam_bringup.c b/boards/arm/samd2l2/circuit-express/src/sam_bringup.c
new file mode 100644
index 0000000..7e281a9
--- /dev/null
+++ b/boards/arm/samd2l2/circuit-express/src/sam_bringup.c
@@ -0,0 +1,60 @@
+/****************************************************************************
+ * boards/arm/samd2l2/circuit-express/src/sam_bringup.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <debug.h>
+
+#include <nuttx/board.h>
+
+#include "sam_config.h"
+#include "circuit_express.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_bringup
+ *
+ * Description:
+ * Bring up board features
+ *
+ ****************************************************************************/
+
+int sam_bringup(void)
+{
+ int ret = OK;
+
+ return ret;
+}