boards: Add Arduino MKRZero

Built upon the existing SoC for Atmel's SAMD21 MCU but with support
enabled for two newly added peripherals:

- I2C port (SERCOM)
- External Interrupt Controller

Signed-off-by: Madani Lainani <[email protected]>

Author: madlain

boards/arm/arduino_mkrzero/CMakeLists.txt

@@ -0,0 +1,7 @@
+# Copyright (c) 2018 Madani Lainani.
+# SPDX-License-Identifier: Apache-2.0
+
+if(CONFIG_PINMUX_SAM0)
+  zephyr_library()
+  zephyr_library_sources(pinmux.c)
+endif()

boards/arm/arduino_mkrzero/Kconfig.board

@@ -0,0 +1,8 @@
+# Kconfig - Arduino MKRZero Board configuration
+#
+# Copyright (c) 2018 Madani Lainani.
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_ARDUINO_MKRZERO
+	bool "Arduino MKRZero"
+	depends on SOC_PART_NUMBER_SAMD21G18A

boards/arm/arduino_mkrzero/Kconfig.defconfig

@@ -0,0 +1,11 @@
+# Kconfig - Arduino MKRZero board configuration
+#
+# Copyright (c) 2018 Madani Lainani.
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_ARDUINO_MKRZERO
+
+config BOARD
+	default "arduino_mkrzero"
+
+endif # BOARD_ARDUINO_MKRZERO

boards/arm/arduino_mkrzero/arduino_mkrzero.dts

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2018 Madani Lainani.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+#include <atmel/samd21.dtsi>
+#include <dt-bindings/i2c/i2c.h>
+
+/ {
+	model = "Arduino MKRZero";
+	compatible = "arduino,mkrzero", "atmel,samd21g18a", "atmel,samd21";
+
+	chosen {
+		zephyr,console = &sercom5;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+	};
+
+	/* These aliases are provided for compatibility with samples */
+	aliases {
+		led0 = &led_builtin;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led_builtin: led_0 {
+			gpios = <&portb 8 0>;
+			label = "Built-in LED";
+		};
+	};
+};
+
+&sercom0 {
+	status = "ok";
+	compatible = "atmel,sam0-i2c";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+};
+
+&sercom5 {
+	status = "ok";
+	compatible = "atmel,sam0-uart";
+	current-speed = <115200>;
+	rxpo = <3>;
+	txpo = <1>;
+};
+
+&portb {
+	status = "ok";
+};
+
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/*
+		 * The final 16 KiB is reserved for the application
+		 * and is used by NFFS if enabled.
+		 */
+
+#if defined(CONFIG_FS_FLASH_MAP_STORAGE)
+		storage_partition: partition@3c000 {
+			label = "storage";
+			reg = <0x0003c000 0x00004000>;
+		};
+#endif
+	};
+};
+
+&eic0 {
+	status = "ok";
+};

boards/arm/arduino_mkrzero/arduino_mkrzero.yaml

@@ -0,0 +1,17 @@
+# Copyright (c) 2018, Madani Lainani.
+# SPDX-License-Identifier: Apache-2.0
+
+identifier: arduino_mkrzero
+name: Arduino MKRZero
+type: mcu
+arch: arm
+ram: 32
+flash: 256
+toolchain:
+  - zephyr
+  - gccarmemb
+supported:
+  - gpio
+  - i2c
+  - pinmux
+  - uart

boards/arm/arduino_mkrzero/arduino_mkrzero_defconfig

@@ -0,0 +1,54 @@
+# Copyright (c) 2018 Madani Lainani.
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_ARM=y
+CONFIG_SOC_FAMILY_SAM0=y
+CONFIG_SOC_SERIES_SAMD21=y
+CONFIG_SOC_PART_NUMBER_SAMD21G18A=y
+CONFIG_BOARD_ARDUINO_MKRZERO=y
+CONFIG_CORTEX_M_SYSTICK=y
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+CONFIG_SERIAL=y
+CONFIG_UART_SAM0=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+CONFIG_GPIO=y
+CONFIG_GPIO_SAM0=y
+CONFIG_WATCHDOG=y
+CONFIG_WDT_SAM0=y
+CONFIG_SOC_ATMEL_SAMD_XOSC32K=y
+CONFIG_SOC_ATMEL_SAMD_XOSC32K_AS_MAIN=y
+# CONFIG_SPI=y
+# CONFIG_SPI_SAM0=y
+
+# The below definition is not used in the SAM0 SERCOM SPI driver code. Its sole
+# purpose seems to be reflecting the board DTS configuration in the
+# configuration interface.
+# CONFIG_SPI_1=y
+CONFIG_I2C=y
+CONFIG_I2C_SAM0=y
+
+# The below definition is not used in the SAM0 SERCOM I2C driver code. Its sole
+# purpose seems to be reflecting the board DTS configuration in the
+# configuration interface.
+CONFIG_I2C_0=y
+CONFIG_PINMUX=y
+CONFIG_PINMUX_SAM0=y
+# CONFIG_USB=y
+# CONFIG_USB_DC_SAM0=y
+
+# External Interrupt Controller
+# CONFIG_EIC_SAM0=y
+
+# Map External interrupt 2 to pin A1
+# CONFIG_GPIO_SAM0_PORTB_EXTINT_2=y
+# CONFIG_GPIO_SAM0_PORTB_EXTINT_2_PIN=2
+
+# FXAS21002C gyroscope I2C address on the Adafruit Precision NXP 9-DOF breakout
+# board
+# CONFIG_FXAS21002_I2C_NAME="SERCOM0"
+# CONFIG_FXAS21002_I2C_ADDRESS=0x21
+# CONFIG_FXAS21002_RANGE=3
+
+# CONFIG_FXAS21002_GPIO_NAME="PORTB"
+# CONFIG_FXAS21002_GPIO_PIN=2

boards/arm/arduino_mkrzero/board.cmake

@@ -0,0 +1,4 @@
+# Copyright (c) 2018 Madani Lainani.
+# SPDX-License-Identifier: Apache-2.0
+
+include(${ZEPHYR_BASE}/boards/common/openocd.board.cmake)

boards/arm/arduino_mkrzero/board.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2018 Madani Lainani.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef __INC_BOARD_H
+#define __INC_BOARD_H
+
+#include <soc.h>
+
+/* Default rise time in nanoseconds, based on 4.7K ohm pull up resistors */
+#define CONFIG_I2C_SAM0_SERCOM0_RISE_TIME_NS	125
+
+#define CONFIG_SPI_SAM0_SERCOM1_PADS				\
+	(SERCOM_SPI_CTRLA_DIPO(3) | SERCOM_SPI_CTRLA_DOPO(0))
+
+#define CONFIG_UART_SAM0_SERCOM5_PADS \
+	(SERCOM_USART_CTRLA_RXPO(3) | SERCOM_USART_CTRLA_TXPO(1))
+
+#endif /* __INC_BOARD_H */