diff --git a/lib/protomatter b/lib/protomatter
index c411714cbdc0..1b8f461f6401 160000
--- a/lib/protomatter
+++ b/lib/protomatter
@@ -1 +1 @@
-Subproject commit c411714cbdc05725e80398acb18c3c1fb6fa68a4
+Subproject commit 1b8f461f6401d6418bba5c6ec0108375c2c1b62f
diff --git a/ports/stm/common-hal/microcontroller/Pin.c b/ports/stm/common-hal/microcontroller/Pin.c
index 5e131c310f06..6102134978e6 100644
--- a/ports/stm/common-hal/microcontroller/Pin.c
+++ b/ports/stm/common-hal/microcontroller/Pin.c
@@ -134,3 +134,15 @@ GPIO_TypeDef * pin_port(uint8_t pin_port) {
 uint16_t pin_mask(uint8_t pin_number) {
     return 1<<pin_number;
 }
+
+uint8_t common_hal_mcu_pin_number(const mcu_pin_obj_t* pin) {
+    return pin->port * 16 + pin->number;
+}
+
+void common_hal_mcu_pin_claim(const mcu_pin_obj_t* pin) {
+    claim_pin(pin);
+}
+
+void common_hal_mcu_pin_reset_number(uint8_t pin_no) {
+    reset_pin_number(pin_no / 16, pin_no % 16);
+}
diff --git a/ports/stm/common-hal/rgbmatrix/RGBMatrix.c b/ports/stm/common-hal/rgbmatrix/RGBMatrix.c
new file mode 100644
index 000000000000..9e60cc3e6f50
--- /dev/null
+++ b/ports/stm/common-hal/rgbmatrix/RGBMatrix.c
@@ -0,0 +1,54 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Jeff Epler 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 <stddef.h>
+
+#include "common-hal/rgbmatrix/RGBMatrix.h"
+
+#include STM32_HAL_H
+
+extern void _PM_IRQ_HANDLER(void);
+
+void *common_hal_rgbmatrix_timer_allocate() {
+    // TODO(jepler) properly handle resource allocation including never-reset
+    return TIM6;
+}
+
+
+void common_hal_rgbmatrix_timer_enable(void* ptr) {
+    HAL_NVIC_EnableIRQ(TIM6_DAC_IRQn);
+}
+
+void common_hal_rgbmatrix_timer_disable(void* ptr) {
+    TIM_TypeDef *tim = (TIM_TypeDef*)ptr;
+    tim->DIER &= ~TIM_DIER_UIE;
+    HAL_NVIC_DisableIRQ(TIM6_DAC_IRQn);
+}
+
+void common_hal_rgbmatrix_timer_free(void* ptr) {
+    common_hal_rgbmatrix_timer_disable(ptr);
+    // TODO(jepler) properly handle resource allocation including never-reset
+}
diff --git a/ports/stm/common-hal/rgbmatrix/RGBMatrix.h b/ports/stm/common-hal/rgbmatrix/RGBMatrix.h
new file mode 100644
index 000000000000..48de4dcb212d
--- /dev/null
+++ b/ports/stm/common-hal/rgbmatrix/RGBMatrix.h
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Jeff Epler 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.
+ */
+
+#ifndef MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_RGBMATRIX_RGBMATRIX_H
+#define MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_RGBMATRIX_RGBMATRIX_H
+
+void *common_hal_rgbmatrix_timer_allocate(void);
+void common_hal_rgbmatrix_timer_enable(void*);
+void common_hal_rgbmatrix_timer_disable(void*);
+void common_hal_rgbmatrix_timer_free(void*);
+
+#endif
diff --git a/ports/stm/common-hal/rgbmatrix/__init__.c b/ports/stm/common-hal/rgbmatrix/__init__.c
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/ports/stm/common-hal/rgbmatrix/__init__.h b/ports/stm/common-hal/rgbmatrix/__init__.h
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/ports/stm/mpconfigport.mk b/ports/stm/mpconfigport.mk
index e6d6e5f2ea72..d23c14b7b6eb 100644
--- a/ports/stm/mpconfigport.mk
+++ b/ports/stm/mpconfigport.mk
@@ -7,6 +7,8 @@ ifeq ($(MCU_SERIES),F4)
 	# Not yet implemented common-hal modules:
 	CIRCUITPY_AUDIOBUSIO = 0
 	CIRCUITPY_AUDIOIO = 0
+	CIRCUITPY_FRAMEBUFFERIO = 1
+	CIRCUITPY_RGBMATRIX = 1
 	CIRCUITPY_ROTARYIO = 0
 	CIRCUITPY_RTC = 0
 	CIRCUITPY_FREQUENCYIO = 0