diff --git a/SConscript.firmware b/SConscript.firmware
index 52df3a4cb9..2b059b4adc 100644
--- a/SConscript.firmware
+++ b/SConscript.firmware
@@ -278,6 +278,7 @@ SOURCE_TREZORHAL = [
     'embed/trezorhal/flash.c',
     'embed/trezorhal/mini_printf.c',
     'embed/trezorhal/rng.c',
+    'embed/trezorhal/sbu.c',
     'embed/trezorhal/sdcard.c',
     'embed/trezorhal/stm32_it.c',
     'embed/trezorhal/stm32_system.c',
diff --git a/embed/extmod/modtrezorio/modtrezorio-sbu.h b/embed/extmod/modtrezorio/modtrezorio-sbu.h
new file mode 100644
index 0000000000..fb50066c03
--- /dev/null
+++ b/embed/extmod/modtrezorio/modtrezorio-sbu.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) Pavol Rusnak, SatoshiLabs
+ *
+ * Licensed under TREZOR License
+ * see LICENSE file for details
+ */
+
+#if defined TREZOR_STM32
+#include "sbu.h"
+#elif defined TREZOR_UNIX
+#include "unix-sbu-mock.h"
+#else
+#error Unsupported TREZOR port. Only STM32 and UNIX ports are supported.
+#endif
+
+/// class SBU:
+///     '''
+///     '''
+typedef struct _mp_obj_SBU_t {
+    mp_obj_base_t base;
+} mp_obj_SBU_t;
+
+/// def __init__(self) -> None:
+///     '''
+///     '''
+STATIC mp_obj_t mod_trezorio_SBU_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    mp_arg_check_num(n_args, n_kw, 0, 0, false);
+    mp_obj_SBU_t *o = m_new_obj(mp_obj_SBU_t);
+    o->base.type = type;
+    sbu_init();
+    return MP_OBJ_FROM_PTR(o);
+}
+
+/// def set(self, sbu1: bool, sbu2: bool) -> None:
+///     '''
+///     Sets SBU wires to sbu1 and sbu2 values respectively
+///     '''
+STATIC mp_obj_t mod_trezorio_SBU_set(mp_obj_t self, mp_obj_t sbu1, mp_obj_t sbu2) {
+    sbu_set(mp_obj_is_true(sbu1), mp_obj_is_true(sbu2));
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_trezorio_SBU_set_obj, mod_trezorio_SBU_set);
+
+STATIC const mp_rom_map_elem_t mod_trezorio_SBU_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_set), MP_ROM_PTR(&mod_trezorio_SBU_set_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(mod_trezorio_SBU_locals_dict, mod_trezorio_SBU_locals_dict_table);
+
+STATIC const mp_obj_type_t mod_trezorio_SBU_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_SBU,
+    .make_new = mod_trezorio_SBU_make_new,
+    .locals_dict = (void*)&mod_trezorio_SBU_locals_dict,
+};
diff --git a/embed/extmod/modtrezorio/modtrezorio.c b/embed/extmod/modtrezorio/modtrezorio.c
index 71a85fab88..0a7bd3bb1c 100644
--- a/embed/extmod/modtrezorio/modtrezorio.c
+++ b/embed/extmod/modtrezorio/modtrezorio.c
@@ -11,12 +11,15 @@
 
 #if MICROPY_PY_TREZORIO
 
+#include "modtrezorio-sbu.h"
 #include "modtrezorio-sdcard.h"
 #include "modtrezorio-msg.h"
 
 STATIC const mp_rom_map_elem_t mp_module_trezorio_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_trezorio) },
 
+    { MP_ROM_QSTR(MP_QSTR_SBU), MP_ROM_PTR(&mod_trezorio_SBU_type) },
+
     { MP_ROM_QSTR(MP_QSTR_SDCard), MP_ROM_PTR(&mod_trezorio_SDCard_type) },
 
     { MP_ROM_QSTR(MP_QSTR_USB), MP_ROM_PTR(&mod_trezorio_USB_type) },
diff --git a/embed/extmod/modtrezorio/unix-sbu-mock.h b/embed/extmod/modtrezorio/unix-sbu-mock.h
new file mode 100644
index 0000000000..758cf00ce0
--- /dev/null
+++ b/embed/extmod/modtrezorio/unix-sbu-mock.h
@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) Pavol Rusnak, SatoshiLabs
+ *
+ * Licensed under TREZOR License
+ * see LICENSE file for details
+ */
+
+#include "../../trezorhal/sbu.h"
+
+int sbu_init(void)
+{
+    return 0;
+}
+
+void sbu_set(bool sbu1, bool sbu2)
+{
+}
diff --git a/embed/trezorhal/sbu.c b/embed/trezorhal/sbu.c
new file mode 100644
index 0000000000..d290ef9ac7
--- /dev/null
+++ b/embed/trezorhal/sbu.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) Pavol Rusnak, SatoshiLabs
+ *
+ * Licensed under TREZOR License
+ * see LICENSE file for details
+ */
+
+#include STM32_HAL_H
+
+#include "sbu.h"
+
+int sbu_init(void) {
+    GPIO_InitTypeDef GPIO_InitStructure;
+
+    // SBU1/PA2 SBU2/PA3
+    GPIO_InitStructure.Pin = GPIO_PIN_2 | GPIO_PIN_3;
+    GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
+    GPIO_InitStructure.Pull = GPIO_NOPULL;
+    GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+    HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
+
+    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_2, GPIO_PIN_RESET);
+    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_3, GPIO_PIN_RESET);
+
+    return 0;
+}
+
+void sbu_set(bool sbu1, bool sbu2) {
+    HAL_GPIO_WritePin(GPIOC, GPIO_PIN_2, sbu1 ? GPIO_PIN_SET : GPIO_PIN_RESET);
+    HAL_GPIO_WritePin(GPIOC, GPIO_PIN_3, sbu2 ? GPIO_PIN_SET : GPIO_PIN_RESET);
+}
diff --git a/embed/trezorhal/sbu.h b/embed/trezorhal/sbu.h
new file mode 100644
index 0000000000..9682dafb32
--- /dev/null
+++ b/embed/trezorhal/sbu.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) Pavol Rusnak, SatoshiLabs
+ *
+ * Licensed under TREZOR License
+ * see LICENSE file for details
+ */
+
+#ifndef __TREZORHAL_SBU_H__
+#define __TREZORHAL_SBU_H__
+
+#include <stdbool.h>
+
+int sbu_init(void);
+void sbu_set(bool sbu1, bool sbu2);
+
+#endif