diff --git a/src/adafruit_blinka/board/milkv_duo.py b/src/adafruit_blinka/board/milkv_duo.py
new file mode 100644
index 00000000..463c4012
--- /dev/null
+++ b/src/adafruit_blinka/board/milkv_duo.py
@@ -0,0 +1,40 @@
+# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+"""Pin definitions for the Milk-V Duo."""
+
+from adafruit_blinka.microcontroller.cv1800b import pin
+
+# see milkvduo/sdk_linux/duo-buildroot-sdk/buildroot-2021.05/
+#   package/python-pinpong/pinpong/extension/milkvDuo.py
+GP1 = pin.GP1
+GP2 = pin.GP2
+GP3 = pin.GP3
+GP4 = pin.GP4
+GP5 = pin.GP5
+GP6 = pin.GP6
+GP7 = pin.GP7
+GP8 = pin.GP8
+GP9 = pin.GP9
+GP10 = pin.GP10
+GP11 = pin.GP11
+GP12 = pin.GP12
+GP13 = pin.GP13
+GP14 = pin.GP14
+GP15 = pin.GP15
+GP16 = pin.GP16
+GP17 = pin.GP17
+GP18 = pin.GP18
+GP19 = pin.GP19
+GP20 = pin.GP20
+GP21 = pin.GP21
+GP22 = pin.GP22
+GP25 = pin.GP25
+GP26 = pin.GP26
+GP27 = pin.GP27
+
+SCLK = pin.SPI2_SCLK
+MOSI = pin.SPI2_MOSI
+MISO = pin.SPI2_MISO
+CS = pin.SPI2_CS
+SCK = SCLK
diff --git a/src/adafruit_blinka/microcontroller/cv1800b/__init__.py b/src/adafruit_blinka/microcontroller/cv1800b/__init__.py
new file mode 100644
index 00000000..bc66679d
--- /dev/null
+++ b/src/adafruit_blinka/microcontroller/cv1800b/__init__.py
@@ -0,0 +1,4 @@
+# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+"""Definition for the CVITEK CV1800B chip"""
diff --git a/src/adafruit_blinka/microcontroller/cv1800b/pin.py b/src/adafruit_blinka/microcontroller/cv1800b/pin.py
new file mode 100644
index 00000000..a592b641
--- /dev/null
+++ b/src/adafruit_blinka/microcontroller/cv1800b/pin.py
@@ -0,0 +1,45 @@
+# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+"""CVITEK CV1800B pin names"""
+
+# from adafruit_blinka.microcontroller.generic_linux.libgpiod_pin import Pin
+from adafruit_blinka.microcontroller.generic_linux.sysfs_pin import Pin
+
+# see milkvduo/sdk_linux/duo-buildroot-sdk/buildroot-2021.05/
+#   package/python-pinpong/pinpong/extension/milkvDuo.py
+GP0 = Pin(508)
+GP1 = Pin(509)
+GP2 = Pin(378)
+GP3 = Pin(377)
+GP4 = Pin(371)
+GP5 = Pin(372)
+GP6 = Pin(375)
+GP7 = Pin(374)
+GP8 = Pin(373)
+GP9 = Pin(370)
+GP10 = Pin(425)
+GP11 = Pin(426)
+GP12 = Pin(496)
+GP13 = Pin(497)
+GP14 = Pin(494)
+GP15 = Pin(495)
+GP16 = Pin(503)
+GP17 = Pin(504)
+GP18 = Pin(502)
+GP19 = Pin(505)
+GP20 = Pin(507)
+GP21 = Pin(506)
+GP22 = Pin(356)
+GP25 = Pin(440)
+GP26 = Pin(451)
+GP27 = Pin(454)
+
+# SPI
+SPI2_CS = GP9
+SPI2_SCLK = GP6
+SPI2_MISO = GP8
+SPI2_MOSI = GP7
+
+# ordered as spiId, sckId, mosiId, misoId
+spiPorts = ((0, SPI2_SCLK, SPI2_MOSI, SPI2_MISO),)
diff --git a/src/board.py b/src/board.py
index 2c569261..ca7c683f 100644
--- a/src/board.py
+++ b/src/board.py
@@ -376,6 +376,9 @@
 elif board_id == ap_board.LICHEEPI_4A:
     from adafruit_blinka.board.licheepi_4a import *
 
+elif board_id == ap_board.MILKV_DUO:
+    from adafruit_blinka.board.milkv_duo import *
+
 elif "sphinx" in sys.modules:
     pass
 
diff --git a/src/digitalio.py b/src/digitalio.py
index e7926304..640a8cfc 100644
--- a/src/digitalio.py
+++ b/src/digitalio.py
@@ -135,6 +135,8 @@
     from machine import Pin
 elif detector.chip.RP2040:
     from machine import Pin
+elif detector.chip.CV1800B:
+    from adafruit_blinka.microcontroller.cv1800b.pin import Pin
 
 from adafruit_blinka import Enum, ContextManaged
 
diff --git a/src/microcontroller/__init__.py b/src/microcontroller/__init__.py
index 1667986a..2c51e3b0 100644
--- a/src/microcontroller/__init__.py
+++ b/src/microcontroller/__init__.py
@@ -144,6 +144,8 @@ def delay_us(delay):
     from adafruit_blinka.microcontroller.rp2040_u2if import *
 elif chip_id == ap_chip.D1_RISCV:
     from adafruit_blinka.microcontroller.allwinner.D1 import *
+elif chip_id == ap_chip.CV1800B:
+    from adafruit_blinka.microcontroller.cv1800b import *
 elif chip_id == ap_chip.TH1520:
     from adafruit_blinka.microcontroller.thead.th1520 import *
 elif chip_id == ap_chip.GENERIC_X86:
diff --git a/src/microcontroller/pin.py b/src/microcontroller/pin.py
index f0da3194..c499364f 100644
--- a/src/microcontroller/pin.py
+++ b/src/microcontroller/pin.py
@@ -139,6 +139,8 @@
     from adafruit_blinka.microcontroller.rp2040_u2if.pin import *
 elif chip_id == ap_chip.D1_RISCV:
     from adafruit_blinka.microcontroller.allwinner.D1.pin import *
+elif chip_id == ap_chip.CV1800B:
+    from adafruit_blinka.microcontroller.cv1800b.pin import *
 elif chip_id == ap_chip.TH1520:
     from adafruit_blinka.microcontroller.thead.th1520.pin import *
 elif "sphinx" in sys.modules: