diff --git a/.gitmodules b/.gitmodules
index 59048d6c03..9025eb7d66 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -55,3 +55,9 @@
 [submodule "frozen/Adafruit_CircuitPython_HID"]
 	path = frozen/Adafruit_CircuitPython_HID
 	url = https://github.com/adafruit/Adafruit_CircuitPython_HID.git
+[submodule "ports/atmel-samd/Adafruit_CircuitPython_Motor"]
+	path = frozen/Adafruit_CircuitPython_Motor
+	url = https://github.com/adafruit/Adafruit_CircuitPython_Motor.git
+[submodule "ports/atmel-samd/Adafruit_CircuitPython_seesaw"]
+	path = frozen/Adafruit_CircuitPython_seesaw
+	url = https://github.com/adafruit/Adafruit_CircuitPython_seesaw.git
diff --git a/frozen/Adafruit_CircuitPython_Motor b/frozen/Adafruit_CircuitPython_Motor
new file mode 160000
index 0000000000..6da5d14b98
--- /dev/null
+++ b/frozen/Adafruit_CircuitPython_Motor
@@ -0,0 +1 @@
+Subproject commit 6da5d14b98ac3d929662731f73ce03c0c958b520
diff --git a/frozen/Adafruit_CircuitPython_seesaw b/frozen/Adafruit_CircuitPython_seesaw
new file mode 160000
index 0000000000..71f3947ff9
--- /dev/null
+++ b/frozen/Adafruit_CircuitPython_seesaw
@@ -0,0 +1 @@
+Subproject commit 71f3947ff94ca070eb01c5f872b0400031be8086
diff --git a/ports/atmel-samd/Makefile b/ports/atmel-samd/Makefile
index eb25c1aa30..1fdeab5f5e 100644
--- a/ports/atmel-samd/Makefile
+++ b/ports/atmel-samd/Makefile
@@ -165,6 +165,19 @@ ifndef INTERNAL_LIBM
 LIBS += -lm
 endif
 
+# Propagate longint choice from .mk to C.
+ifdef LONGINT_IMPL_NONE
+CFLAGS += -DLONGINT_IMPL_NONE
+endif
+
+ifdef LONGINT_IMPL_MPZ
+CFLAGS += -DLONGINT_IMPL_MPZ
+endif
+
+ifdef LONGINT_IMPL_LONGLONG
+CFLAGS += -DLONGINT_IMPL_LONGLONG
+endif
+
 ifeq ($(CHIP_FAMILY), samd21)
 LDFLAGS += -mthumb -mcpu=cortex-m0plus -Lasf/thirdparty/CMSIS/Lib/GCC/
 BOOTLOADER_SIZE := 0x2000
diff --git a/ports/atmel-samd/boards/arduino_zero/mpconfigboard.mk b/ports/atmel-samd/boards/arduino_zero/mpconfigboard.mk
index b24cc9c647..638c76e1f0 100644
--- a/ports/atmel-samd/boards/arduino_zero/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/arduino_zero/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Arduino Zero"
 USB_MANUFACTURER = "Arduino"
 
 INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_NONE = 1
 
 CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.h b/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.h
index 44da28eae4..3d97e2cb19 100644
--- a/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.h
+++ b/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.h
@@ -1,9 +1,6 @@
 #define MICROPY_HW_BOARD_NAME "Adafruit CircuitPlayground Express"
 #define MICROPY_HW_MCU_NAME "samd21g18"
 
-#define MICROPY_LONGINT_IMPL MICROPY_LONGINT_IMPL_MPZ
-#define MP_SSIZE_MAX         0x7fffffff
-
 // Don't allow touch on A0 (PA02), because it's connected to the speaker.
 #define PA02_NO_TOUCH       (true)
 
diff --git a/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.mk b/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.mk
index 3b341c32c9..a3580923c2 100644
--- a/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "CircuitPlayground Express"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 SPI_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_MPZ = 1
 
 CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/circuitplayground_express_crickit/board.c b/ports/atmel-samd/boards/circuitplayground_express_crickit/board.c
new file mode 100644
index 0000000000..eb7ffab4a2
--- /dev/null
+++ b/ports/atmel-samd/boards/circuitplayground_express_crickit/board.c
@@ -0,0 +1,66 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <string.h>
+
+#include "boards/board.h"
+#include "common-hal/microcontroller/Pin.h"
+#include "hal/include/hal_gpio.h"
+#include "shared-bindings/digitalio/DigitalInOut.h"
+#include "shared-bindings/neopixel_write/__init__.h"
+#include "samd21_pins.h"
+
+void board_init(void)
+{
+}
+
+// Check the status of the two buttons on CircuitPlayground Express. If both are
+// pressed, then boot into user safe mode.
+bool board_requests_safe_mode(void) {
+    gpio_set_pin_function(PIN_PA14, GPIO_PIN_FUNCTION_OFF);
+    gpio_set_pin_direction(PIN_PA14, GPIO_DIRECTION_IN);
+    gpio_set_pin_pull_mode(PIN_PA14, GPIO_PULL_DOWN);
+
+    gpio_set_pin_function(PIN_PA28, GPIO_PIN_FUNCTION_OFF);
+    gpio_set_pin_direction(PIN_PA28, GPIO_DIRECTION_IN);
+    gpio_set_pin_pull_mode(PIN_PA28, GPIO_PULL_DOWN);
+    bool safe_mode = gpio_get_pin_level(PIN_PA14) &&
+        gpio_get_pin_level(PIN_PA28);
+    reset_pin(PIN_PA14);
+    reset_pin(PIN_PA28);
+    return safe_mode;
+}
+
+void reset_board(void) {
+    uint8_t empty[30];
+    memset(empty, 0, 30);
+    digitalio_digitalinout_obj_t neopixel_pin;
+    common_hal_digitalio_digitalinout_construct(&neopixel_pin, &pin_PB23);
+    common_hal_digitalio_digitalinout_switch_to_output(&neopixel_pin, false,
+        DRIVE_MODE_PUSH_PULL);
+    common_hal_neopixel_write(&neopixel_pin, empty, 30);
+    common_hal_digitalio_digitalinout_deinit(&neopixel_pin);
+}
diff --git a/ports/atmel-samd/boards/circuitplayground_express_crickit/mpconfigboard.h b/ports/atmel-samd/boards/circuitplayground_express_crickit/mpconfigboard.h
new file mode 100644
index 0000000000..83cc19d9f3
--- /dev/null
+++ b/ports/atmel-samd/boards/circuitplayground_express_crickit/mpconfigboard.h
@@ -0,0 +1,73 @@
+#define MICROPY_HW_BOARD_NAME "Adafruit CircuitPlayground Express with Crickit libraries"
+#define MICROPY_HW_MCU_NAME "samd21g18"
+
+// No framebuf on CRICKit version to save space.
+#define MICROPY_PY_FRAMEBUF         (0)
+
+// Don't allow touch on A0 (PA02), because it's connected to the speaker.
+#define PA02_NO_TOUCH       (true)
+
+// Salae reads 12mhz which is the limit even though we set it to the safer 8mhz.
+#define SPI_FLASH_BAUDRATE  (8000000)
+
+// On-board flash
+#define SPI_FLASH_MOSI_PIN          PIN_PA20
+#define SPI_FLASH_MISO_PIN          PIN_PA16
+#define SPI_FLASH_SCK_PIN           PIN_PA21
+#define SPI_FLASH_CS_PIN            PIN_PB22
+
+#define SPI_FLASH_MOSI_PIN_FUNCTION PINMUX_PA20D_SERCOM3_PAD2
+#define SPI_FLASH_MISO_PIN_FUNCTION PINMUX_PA16D_SERCOM3_PAD0
+#define SPI_FLASH_SCK_PIN_FUNCTION  PINMUX_PA21D_SERCOM3_PAD3
+#define SPI_FLASH_SERCOM            SERCOM3
+#define SPI_FLASH_SERCOM_INDEX      3
+#define SPI_FLASH_MOSI_PAD          2
+#define SPI_FLASH_MISO_PAD          0
+#define SPI_FLASH_SCK_PAD           3
+
+// <o> Transmit Data Pinout
+// <0x0=>PAD[0,1]_DO_SCK
+// <0x1=>PAD[2,3]_DO_SCK
+// <0x2=>PAD[3,1]_DO_SCK
+// <0x3=>PAD[0,3]_DO_SCK
+#define SPI_FLASH_DOPO              1
+#define SPI_FLASH_DIPO              0    // same as MISO PAD
+
+// These are pins not to reset.
+// PA24 and PA25 are USB.
+#define MICROPY_PORT_A        (PORT_PA16 | PORT_PA20 | PORT_PA21 | PORT_PA24 | PORT_PA25)
+#define MICROPY_PORT_B        (PORT_PB22)
+#define MICROPY_PORT_C        (0)
+
+#define SPEAKER_ENABLE_PIN    (&pin_PA30)
+
+#include "external_flash/devices.h"
+
+// If you change this, then make sure to update the linker scripts as well to
+// make sure you don't overwrite code.
+#define CIRCUITPY_INTERNAL_NVM_SIZE 256
+
+#define BOARD_FLASH_SIZE (0x00040000 - 0x2000 - CIRCUITPY_INTERNAL_NVM_SIZE)
+
+#include "external_flash/devices.h"
+
+#define EXTERNAL_FLASH_DEVICE_COUNT 2
+#define EXTERNAL_FLASH_DEVICES S25FL216K, \
+                               GD25Q16C
+
+#include "external_flash/external_flash.h"
+
+#define CALIBRATE_CRYSTALLESS 1
+
+// Explanation of how a user got into safe mode.
+#define BOARD_USER_SAFE_MODE_ACTION "pressing both buttons at start up"
+
+#define DEFAULT_I2C_BUS_SCL (&pin_PB03)
+#define DEFAULT_I2C_BUS_SDA (&pin_PB02)
+
+#define DEFAULT_SPI_BUS_SCK (&pin_PA05)
+#define DEFAULT_SPI_BUS_MOSI (&pin_PA07)
+#define DEFAULT_SPI_BUS_MISO (&pin_PA06)
+
+#define DEFAULT_UART_BUS_RX (&pin_PB09)
+#define DEFAULT_UART_BUS_TX (&pin_PB08)
diff --git a/ports/atmel-samd/boards/circuitplayground_express_crickit/mpconfigboard.mk b/ports/atmel-samd/boards/circuitplayground_express_crickit/mpconfigboard.mk
new file mode 100644
index 0000000000..47be11ed48
--- /dev/null
+++ b/ports/atmel-samd/boards/circuitplayground_express_crickit/mpconfigboard.mk
@@ -0,0 +1,22 @@
+LD_FILE = boards/samd21x18-bootloader-external-flash-crystalless.ld
+USB_VID = 0x239A
+USB_PID = 0x8019
+USB_PRODUCT = "CircuitPlayground Express with Crickit libraries"
+USB_MANUFACTURER = "Adafruit Industries LLC"
+
+SPI_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_MPZ = 1
+
+CHIP_VARIANT = SAMD21G18A
+CHIP_FAMILY = samd21
+
+MPY_TOOL_LONGINT_IMPL = -mlongint-impl=mpz
+
+# Include these Python libraries in firmware.
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_BusDevice
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_CircuitPlayground
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_LIS3DH
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_Motor
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_NeoPixel
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_seesaw
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_Thermistor
diff --git a/ports/atmel-samd/boards/circuitplayground_express_crickit/pins.c b/ports/atmel-samd/boards/circuitplayground_express_crickit/pins.c
new file mode 100644
index 0000000000..f4540573a8
--- /dev/null
+++ b/ports/atmel-samd/boards/circuitplayground_express_crickit/pins.c
@@ -0,0 +1,64 @@
+#include "samd21_pins.h"
+#include "board_busses.h"
+
+STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_D12), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_SPEAKER), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PA05) },
+    { MP_ROM_QSTR(MP_QSTR_D6), MP_ROM_PTR(&pin_PA05) },
+    { MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_D9), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_D10), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_PB03) },
+    { MP_ROM_QSTR(MP_QSTR_D3), MP_ROM_PTR(&pin_PB03) },
+    { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PB03) },
+    { MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_PB02) },
+    { MP_ROM_QSTR(MP_QSTR_D2), MP_ROM_PTR(&pin_PB02) },
+    { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PB02) },
+    { MP_ROM_QSTR(MP_QSTR_A6), MP_ROM_PTR(&pin_PB09) },
+    { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PB09) },
+    { MP_ROM_QSTR(MP_QSTR_RX), MP_ROM_PTR(&pin_PB09) },
+    { MP_ROM_QSTR(MP_QSTR_A7), MP_ROM_PTR(&pin_PB08) },
+    { MP_ROM_QSTR(MP_QSTR_D1), MP_ROM_PTR(&pin_PB08) },
+    { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_PB08) },
+    { MP_ROM_QSTR(MP_QSTR_LIGHT), MP_ROM_PTR(&pin_PA11) },
+    { MP_ROM_QSTR(MP_QSTR_A8), MP_ROM_PTR(&pin_PA11) },
+    { MP_ROM_QSTR(MP_QSTR_TEMPERATURE), MP_ROM_PTR(&pin_PA09) },
+    { MP_ROM_QSTR(MP_QSTR_A9), MP_ROM_PTR(&pin_PA09) },
+
+    { MP_ROM_QSTR(MP_QSTR_BUTTON_A), MP_ROM_PTR(&pin_PA28) },
+    { MP_ROM_QSTR(MP_QSTR_D4), MP_ROM_PTR(&pin_PA28) },
+    { MP_ROM_QSTR(MP_QSTR_BUTTON_B), MP_ROM_PTR(&pin_PA14) },
+    { MP_ROM_QSTR(MP_QSTR_D5), MP_ROM_PTR(&pin_PA14) },
+    { MP_ROM_QSTR(MP_QSTR_SLIDE_SWITCH), MP_ROM_PTR(&pin_PA15) },
+    { MP_ROM_QSTR(MP_QSTR_D7), MP_ROM_PTR(&pin_PA15) },
+    { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_PB23) },
+    { MP_ROM_QSTR(MP_QSTR_D8), MP_ROM_PTR(&pin_PB23) },
+
+    { MP_ROM_QSTR(MP_QSTR_D13), MP_ROM_PTR(&pin_PA17) },
+
+    { MP_ROM_QSTR(MP_QSTR_REMOTEIN),  MP_ROM_PTR(&pin_PA12) },
+    { MP_ROM_QSTR(MP_QSTR_IR_RX),  MP_ROM_PTR(&pin_PA12) },
+    { MP_ROM_QSTR(MP_QSTR_REMOTEOUT),  MP_ROM_PTR(&pin_PA23) },
+    { MP_ROM_QSTR(MP_QSTR_IR_TX),  MP_ROM_PTR(&pin_PA23) },
+    { MP_ROM_QSTR(MP_QSTR_IR_PROXIMITY), MP_ROM_PTR(&pin_PA04) },
+
+    { MP_ROM_QSTR(MP_QSTR_MICROPHONE_CLOCK), MP_ROM_PTR(&pin_PA10) },
+    { MP_ROM_QSTR(MP_QSTR_MICROPHONE_DATA), MP_ROM_PTR(&pin_PA08) },
+
+    { MP_ROM_QSTR(MP_QSTR_ACCELEROMETER_INTERRUPT), MP_ROM_PTR(&pin_PA13) },
+    { MP_ROM_QSTR(MP_QSTR_ACCELEROMETER_SDA),   MP_ROM_PTR(&pin_PA00) },
+    { MP_ROM_QSTR(MP_QSTR_ACCELEROMETER_SCL),   MP_ROM_PTR(&pin_PA01) },
+
+    { MP_ROM_QSTR(MP_QSTR_SPEAKER_ENABLE), MP_ROM_PTR(&pin_PA30) },
+
+    { MP_ROM_QSTR(MP_QSTR_SCK),  MP_ROM_PTR(&pin_PA05) },
+    { MP_ROM_QSTR(MP_QSTR_MOSI), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_MISO), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
+    { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_global_dict_table);
diff --git a/ports/atmel-samd/boards/feather_m0_adalogger/mpconfigboard.mk b/ports/atmel-samd/boards/feather_m0_adalogger/mpconfigboard.mk
index debd3d775c..4971ad2342 100644
--- a/ports/atmel-samd/boards/feather_m0_adalogger/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/feather_m0_adalogger/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Feather M0 Adalogger"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_NONE = 1
 
 CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/feather_m0_basic/mpconfigboard.mk b/ports/atmel-samd/boards/feather_m0_basic/mpconfigboard.mk
index 641611176f..2dfd8dba99 100644
--- a/ports/atmel-samd/boards/feather_m0_basic/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/feather_m0_basic/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Feather M0"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_NONE = 1
 
 CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.h b/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.h
index 44141773da..bfa8c642a2 100644
--- a/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.h
+++ b/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.h
@@ -1,9 +1,6 @@
 #define MICROPY_HW_BOARD_NAME "Adafruit Feather M0 Express"
 #define MICROPY_HW_MCU_NAME "samd21g18"
 
-#define MICROPY_LONGINT_IMPL MICROPY_LONGINT_IMPL_MPZ
-#define MP_SSIZE_MAX         0x7fffffff
-
 #define MICROPY_HW_NEOPIXEL (&pin_PA06)
 
 // Clock rates are off: Salae reads 12MHz which is the limit even though we set it to the safer 8MHz.
diff --git a/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.mk b/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.mk
index 202d8a6264..c24eb06734 100644
--- a/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Feather M0 Express"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 SPI_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_MPZ = 1
 
 CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/feather_m0_rfm69/mpconfigboard.mk b/ports/atmel-samd/boards/feather_m0_rfm69/mpconfigboard.mk
index bf4f567af1..5c1cea8e0e 100644
--- a/ports/atmel-samd/boards/feather_m0_rfm69/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/feather_m0_rfm69/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Feather M0 RFM69"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_NONE = 1
 
 CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/feather_m0_rfm9x/mpconfigboard.mk b/ports/atmel-samd/boards/feather_m0_rfm9x/mpconfigboard.mk
index fbc422eef2..b0fc395649 100644
--- a/ports/atmel-samd/boards/feather_m0_rfm9x/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/feather_m0_rfm9x/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Feather M0 RFM9x"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_NONE = 1
 
 CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/feather_m0_supersized/mpconfigboard.mk b/ports/atmel-samd/boards/feather_m0_supersized/mpconfigboard.mk
index 340421f500..e974b921b6 100644
--- a/ports/atmel-samd/boards/feather_m0_supersized/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/feather_m0_supersized/mpconfigboard.mk
@@ -5,7 +5,7 @@ USB_PRODUCT = "Feather M0 Supersized"
 USB_MANUFACTURER = "Dave Astels"
 
 SPI_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_MPZ = 1
 
 CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
-
diff --git a/ports/atmel-samd/boards/feather_m4_express/mpconfigboard.mk b/ports/atmel-samd/boards/feather_m4_express/mpconfigboard.mk
index 2bfd0f3a09..061767c712 100644
--- a/ports/atmel-samd/boards/feather_m4_express/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/feather_m4_express/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Feather M4 Express"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 QSPI_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_MPZ = 1
 
 CHIP_VARIANT = SAMD51G19A
 CHIP_FAMILY = samd51
diff --git a/ports/atmel-samd/boards/gemma_m0/mpconfigboard.mk b/ports/atmel-samd/boards/gemma_m0/mpconfigboard.mk
index a406e8f58f..01329bc32b 100644
--- a/ports/atmel-samd/boards/gemma_m0/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/gemma_m0/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Gemma M0"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_NONE = 1
 
 CHIP_VARIANT = SAMD21E18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.h b/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.h
index fea2d290b5..be59bc5d4a 100644
--- a/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.h
+++ b/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.h
@@ -1,9 +1,6 @@
 #define MICROPY_HW_BOARD_NAME "Adafruit Itsy Bitsy M0 Express"
 #define MICROPY_HW_MCU_NAME "samd21g18"
 
-#define MICROPY_LONGINT_IMPL MICROPY_LONGINT_IMPL_MPZ
-#define MP_SSIZE_MAX         0x7fffffff
-
 #define CIRCUITPY_BITBANG_APA102
 #define MICROPY_HW_APA102_MOSI   (&pin_PA01)
 #define MICROPY_HW_APA102_SCK    (&pin_PA00)
diff --git a/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.mk b/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.mk
index b3e5a636d0..d1ef58049a 100644
--- a/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Itsy Bitsy M0 Express"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 SPI_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_MPZ = 1
 
 CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.mk b/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.mk
index f96661327d..00f4976a3e 100644
--- a/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "ItsyBitsy M4 Express"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 QSPI_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_MPZ = 1
 
 CHIP_VARIANT = SAMD51G19A
 CHIP_FAMILY = samd51
diff --git a/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.h b/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.h
index 4825b66631..f798c5d365 100644
--- a/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.h
+++ b/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.h
@@ -1,9 +1,6 @@
 #define MICROPY_HW_BOARD_NAME "Adafruit Metro M0 Express"
 #define MICROPY_HW_MCU_NAME "samd21g18"
 
-#define MICROPY_LONGINT_IMPL MICROPY_LONGINT_IMPL_MPZ
-#define MP_SSIZE_MAX         0x7fffffff
-
 #define MICROPY_HW_LED_TX   PIN_PA27
 //#define MICROPY_HW_LED_RX   PIN_PA31
 
diff --git a/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.mk b/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.mk
index ee1335c9a0..d449b65e19 100644
--- a/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Metro M0 Express"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 SPI_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_MPZ = 1
 
 CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/metro_m4_express/mpconfigboard.mk b/ports/atmel-samd/boards/metro_m4_express/mpconfigboard.mk
index 1d59ed9664..473690cd7c 100644
--- a/ports/atmel-samd/boards/metro_m4_express/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/metro_m4_express/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Metro M4 Express"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 QSPI_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_MPZ = 1
 
 CHIP_VARIANT = SAMD51J19A
 CHIP_FAMILY = samd51
diff --git a/ports/atmel-samd/boards/metro_m4_express_revb/mpconfigboard.mk b/ports/atmel-samd/boards/metro_m4_express_revb/mpconfigboard.mk
index a3d6e25221..a225067ea2 100644
--- a/ports/atmel-samd/boards/metro_m4_express_revb/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/metro_m4_express_revb/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Metro M4 Express Rev B (Black)"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 SPI_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_MPZ = 1
 
 CHIP_VARIANT = SAMD51J19A
 CHIP_FAMILY = samd51
diff --git a/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk b/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk
index 52dfc14309..fbfa2c9ecd 100644
--- a/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "pIRKey M0"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_NONE = 1
 
 CHIP_VARIANT = SAMD21E18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/trinket_m0/mpconfigboard.mk b/ports/atmel-samd/boards/trinket_m0/mpconfigboard.mk
index 43d07eb5ff..65ecec0e2a 100644
--- a/ports/atmel-samd/boards/trinket_m0/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/trinket_m0/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT = "Trinket M0"
 USB_MANUFACTURER = "Adafruit Industries LLC"
 
 INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_NONE = 1
 
 CHIP_VARIANT = SAMD21E18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/trinket_m0_haxpress/mpconfigboard.mk b/ports/atmel-samd/boards/trinket_m0_haxpress/mpconfigboard.mk
index a904b2837c..95996085f5 100644
--- a/ports/atmel-samd/boards/trinket_m0_haxpress/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/trinket_m0_haxpress/mpconfigboard.mk
@@ -5,6 +5,7 @@ USB_PRODUCT="Trinket M0 Haxpress"
 USB_MANUFACTURER="Radomir Dopieralski"
 
 SPI_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_MPZ = 1
 
 CHIP_VARIANT = SAMD21E18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/ugame10/mpconfigboard.mk b/ports/atmel-samd/boards/ugame10/mpconfigboard.mk
index 343115fbb4..fee23b94d8 100644
--- a/ports/atmel-samd/boards/ugame10/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/ugame10/mpconfigboard.mk
@@ -6,6 +6,7 @@ USB_PRODUCT = "uGame10"
 USB_MANUFACTURER = "Radomir Dopieralski"
 
 SPI_FLASH_FILESYSTEM = 1
+LONGINT_IMPL_MPZ = 1
 
 CHIP_VARIANT = SAMD21E18A
 CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/mpconfigport.h b/ports/atmel-samd/mpconfigport.h
index 8e726f9b74..626519cc10 100644
--- a/ports/atmel-samd/mpconfigport.h
+++ b/ports/atmel-samd/mpconfigport.h
@@ -140,21 +140,27 @@ typedef long mp_off_t;
 #define CIRCUITPY_MCU_FAMILY samd21
 #define MICROPY_PY_SYS_PLATFORM                     "Atmel SAMD21"
 #define PORT_HEAP_SIZE (16384 + 4096)
-// If you change MICROPY_LONGINT_IMPL, also change MPY_TOOL_LONGINT_IMPL in mpconfigport.mk.
-#ifndef MICROPY_LONGINT_IMPL
-#define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_NONE)
-#endif
 #endif
 
 #ifdef SAMD51
 #define CIRCUITPY_MCU_FAMILY samd51
 #define MICROPY_PY_SYS_PLATFORM                     "MicroChip SAMD51"
 #define PORT_HEAP_SIZE (0x20000) // 128KiB
-// If you change MICROPY_LONGINT_IMPL, also change MPY_TOOL_LONGINT_IMPL in mpconfigport.mk.
-#define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_MPZ)
+#endif
+
+#ifdef LONGINT_IMPL_NONE
+#define MICROPY_LONGINT_IMPL (MICROPY_LONGINT_IMPL_NONE)
+#endif
+
+#ifdef LONGINT_IMPL_MPZ
+#define MICROPY_LONGINT_IMPL (MICROPY_LONGINT_IMPL_MPZ)
 #define MP_SSIZE_MAX (0x7fffffff)
 #endif
 
+#ifdef LONGINT_IMPL_LONGLONG
+#define MICROPY_LONGINT_IMPL (MICROPY_LONGINT_IMPL_LONGLONG)
+#endif
+
 // extra built in modules to add to the list of known ones
 extern const struct _mp_obj_module_t microcontroller_module;
 extern const struct _mp_obj_module_t bitbangio_module;
@@ -194,7 +200,9 @@ extern const struct _mp_obj_module_t usb_hid_module;
     #define MICROPY_PY_UERRNO_ERRORCODE (0)
     #define MICROPY_PY_URE (1)
     #define MICROPY_PY_MICROPYTHON_MEM_INFO (1)
-    #define MICROPY_PY_FRAMEBUF         (1)
+    #ifndef MICROPY_PY_FRAMEBUF
+      #define MICROPY_PY_FRAMEBUF         (1)
+    #endif
 
     #define MICROPY_BUILTIN_METHOD_CHECK_SELF_ARG (1)
     #define MICROPY_PY_ALL_SPECIAL_METHODS (1)
diff --git a/ports/atmel-samd/mpconfigport.mk b/ports/atmel-samd/mpconfigport.mk
index 80ec9d9787..25e40af377 100644
--- a/ports/atmel-samd/mpconfigport.mk
+++ b/ports/atmel-samd/mpconfigport.mk
@@ -1,14 +1,21 @@
 # Define an equivalent for MICROPY_LONGINT_IMPL, to pass to $(MPY-TOOL) in py/mkrules.mk
 # $(MPY-TOOL) needs to know what kind of longint to use (if any) to freeze long integers.
 # This should correspond to the MICROPY_LONGINT_IMPL definition in mpconfigport.h.
-ifeq ($(CHIP_FAMILY), samd21)
-ifndef MPY_TOOL_LONGINT_IMPL
+
+ifdef LONGINT_IMPL_NONE
 MPY_TOOL_LONGINT_IMPL = -mlongint-impl=none
 endif
-endif
 
-ifeq ($(CHIP_FAMILY), samd51)
+ifdef LONGINT_IMPL_MPZ
 MPY_TOOL_LONGINT_IMPL = -mlongint-impl=mpz
 endif
 
+ifdef LONGINT_IMPL_LONGLONG
+MPY_TOOL_LONGINT_IMPL = -mlongint-impl=longlong
+endif
+
+ifndef MPY_TOOL_LONGINT_IMPL
+$(error one of LONGINT_IMPL_NONE, LONGINT_IMPL_MPZ, or LONGINT_IMPL_LONGLONG must be defined)
+endif
+
 INTERNAL_LIBM = 1
diff --git a/tools/build_adafruit_bins.sh b/tools/build_adafruit_bins.sh
index 004877f8ee..4d0854a109 100755
--- a/tools/build_adafruit_bins.sh
+++ b/tools/build_adafruit_bins.sh
@@ -2,7 +2,7 @@ rm -rf ports/atmel-samd/build*
 rm -rf ports/esp8266/build*
 rm -rf ports/nrf/build*
 
-ATMEL_BOARDS="arduino_zero circuitplayground_express feather_m0_basic feather_m0_adalogger itsybitsy_m0_express itsybitsy_m4_express feather_m0_rfm69 feather_m0_rfm9x feather_m0_express feather_m4_express metro_m0_express metro_m4_express pirkey_m0 trinket_m0 gemma_m0 feather52"
+ATMEL_BOARDS="arduino_zero circuitplayground_express circuitplayground_express_crickit feather_m0_basic feather_m0_adalogger itsybitsy_m0_express itsybitsy_m4_express feather_m0_rfm69 feather_m0_rfm9x feather_m0_express feather_m4_express metro_m0_express metro_m4_express pirkey_m0 trinket_m0 gemma_m0 feather52"
 ROSIE_SETUPS="rosie-ci"
 
 PARALLEL="-j 5"