diff --git a/keyboards/sauce/mild/config.h b/keyboards/sauce/mild/config.h
new file mode 100644
index 00000000000..6e203a4341e
--- /dev/null
+++ b/keyboards/sauce/mild/config.h
@@ -0,0 +1,58 @@
+/* Copyright 2021 Andy Yong (Sauce)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID 0x8367 // "SC"
+#define PRODUCT_ID 0x7783 // "MS"
+#define DEVICE_VER 0x0001
+#define MANUFACTURER Sauce
+#define PRODUCT Mild
+
+/* key matrix size */
+#define MATRIX_ROWS 6
+#define MATRIX_COLS 17
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ * ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+*/
+#define MATRIX_ROW_PINS { C13, C14, C15, A15, F0, F1 }
+#define MATRIX_COL_PINS { A10, A9, A8, B11, B10, B2, B1, B0, A7, A5, A4, A3, A2, A1, B6, B5, B4 }
+#define UNUSED_PINS
+
+/* COL2ROW, ROW2COL*/
+#define DIODE_DIRECTION COL2ROW
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 5
+
+/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+#define LOCKING_SUPPORT_ENABLE
+/* Locking resynchronize hack */
+#define LOCKING_RESYNC_ENABLE
+
+#define LED_CAPS_LOCK_PIN A6
+#define LED_SCROLL_LOCK_PIN B14
diff --git a/keyboards/sauce/mild/info.json b/keyboards/sauce/mild/info.json
new file mode 100644
index 00000000000..d722a03d8b2
--- /dev/null
+++ b/keyboards/sauce/mild/info.json
@@ -0,0 +1,17 @@
+{
+ "keyboard_name": "Sauce - Mild",
+ "url": "",
+ "maintainer": "Sauce",
+ "layouts": {
+ "LAYOUT_all": {
+ "layout": [
+ {"x":0, "y":0}, {"x":2, "y":0}, {"x":3, "y":0}, {"x":4, "y":0}, {"x":5, "y":0}, {"x":6.5, "y":0}, {"x":7.5, "y":0}, {"x":8.5, "y":0}, {"x":9.5, "y":0}, {"x":11, "y":0}, {"x":12, "y":0}, {"x":13, "y":0}, {"x":14, "y":0}, {"x":15.25, "y":0}, {"x":16.25, "y":0}, {"x":17.25, "y":0},
+ {"x":0, "y":1.25}, {"x":1, "y":1.25}, {"x":2, "y":1.25}, {"x":3, "y":1.25}, {"x":4, "y":1.25}, {"x":5, "y":1.25}, {"x":6, "y":1.25}, {"x":7, "y":1.25}, {"x":8, "y":1.25}, {"x":9, "y":1.25}, {"x":10, "y":1.25}, {"x":11, "y":1.25}, {"x":12, "y":1.25}, {"x":13, "y":1.25}, {"x":14, "y":1.25}, {"x":15.25, "y":1.25}, {"x":16.25, "y":1.25}, {"x":17.25, "y":1.25},
+ {"x":0, "y":2.25, "w":1.5}, {"x":1.5, "y":2.25}, {"x":2.5, "y":2.25}, {"x":3.5, "y":2.25}, {"x":4.5, "y":2.25}, {"x":5.5, "y":2.25}, {"x":6.5, "y":2.25}, {"x":7.5, "y":2.25}, {"x":8.5, "y":2.25}, {"x":9.5, "y":2.25}, {"x":10.5, "y":2.25}, {"x":11.5, "y":2.25}, {"x":12.5, "y":2.25}, {"x":13.5, "y":2.25, "w":1.5}, {"x":15.25, "y":2.25}, {"x":16.25, "y":2.25}, {"x":17.25, "y":2.25},
+ {"x":0, "y":3.25, "w":1.75}, {"x":1.75, "y":3.25}, {"x":2.75, "y":3.25}, {"x":3.75, "y":3.25}, {"x":4.75, "y":3.25}, {"x":5.75, "y":3.25}, {"x":6.75, "y":3.25}, {"x":7.75, "y":3.25}, {"x":8.75, "y":3.25}, {"x":9.75, "y":3.25}, {"x":10.75, "y":3.25}, {"x":11.75, "y":3.25}, {"x":12.75, "y":3.25, "w":2.25},
+ {"x":0, "y":4.25, "w":1.25}, {"x":1.25, "y":4.25}, {"x":2.25, "y":4.25}, {"x":3.25, "y":4.25}, {"x":4.25, "y":4.25}, {"x":5.25, "y":4.25}, {"x":6.25, "y":4.25}, {"x":7.25, "y":4.25}, {"x":8.25, "y":4.25}, {"x":9.25, "y":4.25}, {"x":10.25, "y":4.25}, {"x":11.25, "y":4.25}, {"x":12.25, "y":4.25, "w":1.75}, {"x":14, "y":4.25}, {"x":16.25, "y":4.25},
+ {"x":0, "y":5.25, "w":1.5}, {"x":2.5, "y":5.25, "w":1.5}, {"x":4, "y":5.25, "w":7}, {"x":11, "y":5.25, "w":1.5}, {"x":13.5, "y":5.25, "w":1.5}, {"x":15.25, "y":5.25}, {"x":16.25, "y":5.25}, {"x":17.25, "y":5.25}
+ ]
+ }
+ }
+}
diff --git a/keyboards/sauce/mild/keymaps/default/keymap.c b/keyboards/sauce/mild/keymaps/default/keymap.c
new file mode 100644
index 00000000000..4b6f63aa117
--- /dev/null
+++ b/keyboards/sauce/mild/keymaps/default/keymap.c
@@ -0,0 +1,36 @@
+/* Copyright 2021 Andy Yong (Sauce)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+ [0] = LAYOUT_all(
+ KC_ESC, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, KC_PSCR, KC_SLCK, KC_PAUS,
+ KC_GRV, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_MINS, KC_EQL, KC_BSPC, KC_BSPC, KC_INS, KC_HOME, KC_PGUP,
+ KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_LBRC, KC_RBRC, KC_BSLS, KC_DEL, KC_END, KC_PGDN,
+ KC_CAPS, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT, KC_ENT,
+ KC_LSFT, KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT, KC_RSFT, KC_UP,
+ KC_LCTL, KC_LALT, KC_SPC, MO(1), KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT),
+
+ [1] = LAYOUT_all(
+ RESET, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_MPLY, KC_MUTE, KC_VOLU,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_MPRV, KC_MNXT, KC_VOLD,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS),
+
+};
diff --git a/keyboards/sauce/mild/keymaps/via/keymap.c b/keyboards/sauce/mild/keymaps/via/keymap.c
new file mode 100644
index 00000000000..01f5742d0de
--- /dev/null
+++ b/keyboards/sauce/mild/keymaps/via/keymap.c
@@ -0,0 +1,52 @@
+/* Copyright 2021 Andy Yong (Sauce)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+ [0] = LAYOUT_all(
+ KC_ESC, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, KC_PSCR, KC_SLCK, KC_PAUS,
+ KC_GRV, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_MINS, KC_EQL, KC_BSPC, KC_BSPC, KC_INS, KC_HOME, KC_PGUP,
+ KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_LBRC, KC_RBRC, KC_BSLS, KC_DEL, KC_END, KC_PGDN,
+ KC_CAPS, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT, KC_ENT,
+ KC_LSFT, KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT, KC_RSFT, KC_UP,
+ KC_LCTL, KC_LALT, KC_SPC, MO(1), KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT),
+
+ [1] = LAYOUT_all(
+ RESET, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_MPLY, KC_MUTE, KC_VOLU,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_MPRV, KC_MNXT, KC_VOLD,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS),
+
+ [2] = LAYOUT_all(
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS),
+
+ [3] = LAYOUT_all(
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS),
+
+};
diff --git a/keyboards/sauce/mild/keymaps/via/rules.mk b/keyboards/sauce/mild/keymaps/via/rules.mk
new file mode 100644
index 00000000000..1e5b99807cb
--- /dev/null
+++ b/keyboards/sauce/mild/keymaps/via/rules.mk
@@ -0,0 +1 @@
+VIA_ENABLE = yes
diff --git a/keyboards/sauce/mild/mild.c b/keyboards/sauce/mild/mild.c
new file mode 100644
index 00000000000..963cbede9e6
--- /dev/null
+++ b/keyboards/sauce/mild/mild.c
@@ -0,0 +1,17 @@
+/* Copyright 2021 Andy Yong (Sauce)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+
+#include "mild.h"
diff --git a/keyboards/sauce/mild/mild.h b/keyboards/sauce/mild/mild.h
new file mode 100644
index 00000000000..3dbd2630efd
--- /dev/null
+++ b/keyboards/sauce/mild/mild.h
@@ -0,0 +1,37 @@
+/* Copyright 2021 Andy Yong (Sauce)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+
+#pragma once
+
+#include "quantum.h"
+
+#define ____ KC_NO
+
+#define LAYOUT_all( \
+ K000, K001, K002, K003, K004, K005, K006, K007, K008, K009, K010, K011, K012, K014, K015, K016, \
+ K100, K101, K102, K103, K104, K105, K106, K107, K108, K109, K110, K111, K112, K113, K412, K114, K115, K116, \
+ K200, K201, K202, K203, K204, K205, K206, K207, K208, K209, K210, K211, K212, K213, K214, K215, K216, \
+ K300, K301, K302, K303, K304, K305, K306, K307, K308, K309, K310, K311, K314, \
+ K400, K501, K401, K402, K403, K404, K405, K406, K407, K408, K409, K410, K411, K413, K415, \
+ K500, K503, K505, K510, K513, K514, K515, K516 \
+) { \
+ { K000, K001, K002, K003, K004, K005, K006, K007, K008, K009, K010, K011, K012, ____, K014, K015, K016 }, \
+ { K100, K101, K102, K103, K104, K105, K106, K107, K108, K109, K110, K111, K112, K113, K114, K115, K116 }, \
+ { K200, K201, K202, K203, K204, K205, K206, K207, K208, K209, K210, K211, K212, K213, K214, K215, K216 }, \
+ { K300, K301, K302, K303, K304, K305, K306, K307, K308, K309, K310, K311, ____, K314, ____, ____, ____ }, \
+ { K400, K401, K402, K403, K404, K405, K406, K407, K408, K409, K410, K411, K412, K413, ____, K415, ____ }, \
+ { K500, K501, ____, K503, ____, K505, ____, ____, ____, ____, K510, ____, ____, K513, K514, K515, K516 } \
+}
diff --git a/keyboards/sauce/mild/readme.md b/keyboards/sauce/mild/readme.md
new file mode 100644
index 00000000000..70202f19ef3
--- /dev/null
+++ b/keyboards/sauce/mild/readme.md
@@ -0,0 +1,17 @@
+# Sauce Mild
+
+Mild is a basic TKL keyboard
+
+* Keyboard Maintainer: [Sauce](https://github.com/andyywz)
+* Hardware Supported: Mild pcb
+* Hardware Availability: -
+
+Make example for this keyboard (after setting up your build environment):
+
+ make sauce/mild:default
+
+Flashing example for this keyboard:
+
+ make sauce/mild:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
diff --git a/keyboards/sauce/mild/rules.mk b/keyboards/sauce/mild/rules.mk
new file mode 100644
index 00000000000..e913552c9b0
--- /dev/null
+++ b/keyboards/sauce/mild/rules.mk
@@ -0,0 +1,24 @@
+# MCU name
+MCU = STM32F072
+
+# Bootloader selection
+BOOTLOADER = stm32-dfu
+
+# Build Options
+# change yes to no to disable
+#
+BOOTMAGIC_ENABLE = yes # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = yes # Mouse keys
+EXTRAKEY_ENABLE = yes # Audio control and System control
+CONSOLE_ENABLE = no # Console for debug
+COMMAND_ENABLE = no # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = yes # USB Nkey Rollover
+BACKLIGHT_ENABLE = no # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no # Enable keyboard RGB underglow
+AUDIO_ENABLE = no # Audio output
+
+# Enter lower-power sleep mode when on the ChibiOS idle thread
+OPT_DEFS += -DCORTEX_ENABLE_WFI_IDLE=TRUE