diff --git a/common_features.mk b/common_features.mk
index a76c522bfc..f5fce5441c 100644
--- a/common_features.mk
+++ b/common_features.mk
@@ -124,7 +124,7 @@ endif
 ifeq ($(strip $(RGB_MATRIX_ENABLE)), yes)
     OPT_DEFS += -DRGB_MATRIX_ENABLE
     SRC += is31fl3731.c
-    SRC += twi2c.c
+    I2C_ENABLE = yes
     SRC += $(QUANTUM_DIR)/color.c
     SRC += $(QUANTUM_DIR)/rgb_matrix.c
     CIE1931_CURVE = yes
@@ -205,7 +205,7 @@ ifeq ($(strip $(USB_HID_ENABLE)), yes)
 endif
 
 ifeq ($(strip $(I2C_SLAVE_ENABLE)), yes)
-    SRC += twi2c.c
+    I2C_ENABLE = yes
     OPT_DEFS += -DI2C_SLAVE_ENABLE
 endif
 
@@ -214,6 +214,14 @@ ifeq ($(strip $(ENCODER_ENABLE)), yes)
     SRC += $(QUANTUM_DIR)/encoder.c
 endif
 
+ifeq ($(strip $(QWIIC_KEYBOARD_ENABLE)), yes)
+    SRC += qwiic/qwiic_keyboard.c
+    OPT_DEFS += -DQWIIC_KEYBOARD_ENABLE
+endif
+
+ifeq ($(strip $(I2C_ENABLE)), yes)
+    SRC += twi2c.c
+endif
 
 QUANTUM_SRC:= \
     $(QUANTUM_DIR)/quantum.c \
diff --git a/drivers/arm/twi2c.c b/drivers/arm/twi2c.c
index 53af437bc2..973a822430 100644
--- a/drivers/arm/twi2c.c
+++ b/drivers/arm/twi2c.c
@@ -20,10 +20,6 @@
 #include "chprintf.h"
 #include "memstreams.h"
 #include "printf.h"
-#include "matrix.h"
-
-#ifdef I2C_SLAVE_ENABLE
-
 #include "hal_i2cslave.h"
 
 /**
@@ -40,9 +36,8 @@
 //   400000
 // };
 
-I2CSlaveMsgCB twi2c_slave_message_process, catchError, clearAfterSend;
-
-#endif
+I2CSlaveMsgCB twi2c_incoming_message_process, twi2c_catch_error, twi2c_clear_after_send;
+twi2c_message_received twi2c_message_received_callback;
 
 static uint8_t twi2c_address;
 
@@ -54,62 +49,6 @@ static const I2CConfig i2cconfig = {
   0
 };
 
-char initialReplyBody[50] = "Initial reply";        // 'Status' response if read without preceding write
-
-
-uint32_t messageCounter = 0;                /* Counts number of messages received to return as part of response */
-
-uint8_t  rxBody[2];                       /* stores last message master sent us (intentionally a few bytes smaller than txBody) */
-uint8_t  txBody[MATRIX_ROWS/2];                       /* Return message buffer for computed replies */
-
-BaseSequentialStream *chp = NULL;           // Used for serial logging
-
-
-#ifdef I2C_SLAVE_ENABLE
-
-// Handler when something sent to us
-const I2CSlaveMsg echoRx =
-{
-  sizeof(rxBody),       /* max sizeof received msg body */
-  rxBody,               /* body of received msg */
-  NULL,                 /* do nothing on address match */
-  twi2c_slave_message_process,     /* Routine to process received messages */
-  catchError            /* Error hook */
-};
-
-
-// // 'Empty' reply when nothing to say, and no message received. In RAM, to allow update
-I2CSlaveMsg initialReply =
-{
-  sizeof(initialReplyBody),   /* trailing zero byte will be repeated as needed */
-  (uint8_t *)initialReplyBody,
-  NULL,                 /* do nothing on address match */
-  NULL,                 /* do nothing after reply sent */
-  catchError            /* Error hook */
-};
-
-// // 'Empty' reply when nothing to say, and no message received. In RAM, to allow update
-// I2CSlaveMsg initialReply =
-// {
-//   0,  /* trailing zero byte will be repeated as needed */
-//   NULL,
-//   NULL,                 /* do nothing on address match */
-//   NULL,                 /* do nothing after reply sent */
-//   catchError            /* Error hook */
-// };
-
-
-// Response to received messages
-I2CSlaveMsg echoReply = {  /* this is in RAM so size may be updated */
-  MATRIX_ROWS / 2,                    /* filled in with the length of the message to send */
-  txBody,               /* Response message */
-  NULL,                 /* do nothing special on address match */
-  clearAfterSend,       /* Clear receive buffer once replied */
-  catchError            /* Error hook */
-};
-
-
-
 /**
  * Track I2C errors
  */
@@ -123,95 +62,26 @@ void noteI2cError(uint32_t flags)
   gotI2cError = 1;
 }
 
-
-
 /**
  * Generic error handler
  *
  * Called in interrupt context, so need to watch what we do
  */
-void catchError(I2CDriver *i2cp)
+void twi2c_catch_error(I2CDriver *i2cp)
 {
   noteI2cError(i2cp->errors);
 }
 
-extern void matrix_copy(matrix_row_t * copy);
-
-const char hexString[16] = "0123456789abcdef";
-
-
-
-/**
- *  Message processor - looks at received message, determines reply as quickly as possible
- *
- *  Responds with the value of the messageCounter (in hex), followed by the received message in [..]
- *
- *  Note: Called in interrupt context, so need to be quick!
- */
-void twi2c_slave_message_process(I2CDriver *i2cp) {
-
-  // size_t len = i2cSlaveBytes(i2cp);         // Number of bytes received
-
-  // memset(txBody, 0, MATRIX_ROWS / 2 * sizeof(matrix_row_t));
-  matrix_copy(txBody);
-
-  echoReply.size =  MATRIX_ROWS / 2;
-  i2cSlaveReplyI(i2cp, &echoReply);
-}
-
-
 /**
  * Callback after sending of response complete - restores default reply in case polled
  */
-void clearAfterSend(I2CDriver *i2cp)
+void twi2c_clear_after_send(I2CDriver *i2cp)
 {
   // echoReply.size = 0;               // Clear receive message
   // i2cSlaveReplyI(i2cp, &initialReply);
 }
 
-
-/**
- * Start the I2C Slave port to accept comms from master CPU
- *
- * We then go into a loop checking for errors, and never return
- */
-
-void twi2c_slave_init(void) {
-
-  twi2c_init();
-
-
-  i2cStart(&I2C_DRIVER, &i2cconfig);
-#if HAL_USE_I2C_SLAVE
-  I2C_DRIVER.slaveTimeout = MS2ST(100);       // Time for complete message
-#endif
-
-  // i2cSlaveConfigure(&I2C_DRIVER, &echoRx, &initialReply);
-
-  memset(txBody, 0, MATRIX_ROWS / 2 * sizeof(matrix_row_t));
-
-  i2cSlaveConfigure(&I2C_DRIVER, &echoRx, &echoReply);
-
-  // Enable match address after everything else set up
-  i2cMatchAddress(&I2C_DRIVER, slaveI2Caddress/2);
-//  i2cMatchAddress(&I2C_DRIVER, myOtherI2Caddress/2);
- // i2cMatchAddress(&I2C_DRIVER, 0);  /* "all call" */
-
-  printf("Slave I2C started\n\r");
-
-}
-
-void twi2c_slave_task(void) {
-    if (gotI2cError) {
-      gotI2cError = 0;
-        printf("I2cError: %04x\r\n", lastI2cErrorFlags);
-    }
-}
-
-#endif
-
-uint8_t twi2c_start(uint8_t address) {
-  twi2c_address = address;
+uint8_t twi2c_start(void) {
   i2cStart(&I2C_DRIVER, &i2cconfig);
   return 0;
 }
@@ -233,8 +103,66 @@ uint8_t twi2c_write(uint8_t data) {
   return i2cMasterTransmitTimeout(&I2C_DRIVER, twi2c_address/2, &data, 1, 0, 0, MS2ST(100));
 }
 
-uint8_t twi2c_transmit(uint8_t address, uint8_t* data, uint16_t length) {
-  twi2c_address = address;
-  i2cStart(&I2C_DRIVER, &i2cconfig);
-  return i2cMasterTransmitTimeout(&I2C_DRIVER, twi2c_address/2, data, length, 0, 0, MS2ST(100));
+uint8_t twi2c_transmit(uint8_t address, uint8_t * data, uint16_t length) {
+  return i2cMasterTransmitTimeout(&I2C_DRIVER, address/2, data, length, 0, 0, MS2ST(100));
+}
+
+uint8_t twi2c_receive(uint8_t address, uint8_t * data, uint16_t length) {
+  return i2cMasterReceiveTimeout(&I2C_DRIVER, address/2, data, length, MS2ST(100));
+}
+
+
+uint8_t twi2c_incoming_body[50];
+uint8_t twi2c_outgoing_body[1024];
+
+// Response to received messages
+I2CSlaveMsg twi2c_incoming_message = {
+  sizeof(twi2c_incoming_body),
+  twi2c_incoming_body,
+  NULL,
+  twi2c_incoming_message_process,
+  twi2c_catch_error                   /* Error hook */
+};
+
+void twi2c_incoming_message_process(I2CDriver * i2cp) {
+  size_t len = i2cSlaveBytes(i2cp);
+  (*twi2c_message_received_callback)(i2cp, twi2c_incoming_body, len);
+}
+
+// Response to received messages
+I2CSlaveMsg twi2c_outgoing_message = {
+  sizeof(twi2c_outgoing_body),
+  twi2c_outgoing_body,
+  NULL,
+  twi2c_clear_after_send,
+  twi2c_catch_error
+};
+
+uint8_t twi2c_reply(I2CDriver * i2cp, uint8_t * data, uint16_t length) {
+  memcpy(twi2c_outgoing_body, data, length);
+  twi2c_outgoing_message.size = length;
+  i2cSlaveReplyI(i2cp, &twi2c_outgoing_message);
+  return 0;
+}
+
+uint8_t twi2c_transmit_receive(uint8_t address, uint8_t * tx_body, uint16_t tx_length, uint8_t * rx_body, uint16_t rx_length) {
+  return i2cMasterTransmitTimeout(&I2C_DRIVER, address/2, tx_body, tx_length, rx_body, rx_length, MS2ST(100));
+}
+
+uint8_t twi2c_start_listening(uint8_t address, twi2c_message_received callback) {
+  twi2c_message_received_callback = callback;
+  I2C_DRIVER.slaveTimeout = MS2ST(100);
+  i2cSlaveConfigure(&I2C_DRIVER, &twi2c_incoming_message, &twi2c_outgoing_message);
+  i2cMatchAddress(&I2C_DRIVER, address/2);
+  return 0;
+}
+
+uint8_t twi2c_restart_listening(uint8_t address) {
+  i2cMatchAddress(&I2C_DRIVER, address/2);
+  return 0;
+}
+
+void twi2c_stop(void) {
+  i2cUnmatchAll(&I2C_DRIVER);
+  i2cStop(&I2C_DRIVER);
 }
diff --git a/drivers/arm/twi2c.h b/drivers/arm/twi2c.h
index 57cc54070e..daa55fb2d1 100644
--- a/drivers/arm/twi2c.h
+++ b/drivers/arm/twi2c.h
@@ -14,6 +14,9 @@
  * along with this program.  If not, see .
  */
 
+#ifndef TWI2C_H
+#define TWI2C_H
+
 #include "ch.h"
 #include "hal.h"
 
@@ -23,17 +26,11 @@
 
 #define slaveI2Caddress  0x30       /* Address in our terms - halved by later code */
 //#define myOtherI2Caddress 0x19
-
-#ifdef I2C_SLAVE_ENABLE
-
-I2CSlaveMsgCB twi2c_slave_message_process, catchError, clearAfterSend;
-
-void twi2c_slave_init(void);
-
-#endif
+I2CSlaveMsgCB twi2c_incoming_message_process, twi2c_catch_error, twi2c_clear_after_send;
+typedef void (*twi2c_message_received)(I2CDriver *, uint8_t *, uint16_t);
 
 void twi2c_init(void);
-uint8_t twi2c_start(uint8_t address);
+uint8_t twi2c_start(void);
 uint8_t twi2c_write(uint8_t data);
 uint8_t twi2c_read_ack(void);
 uint8_t twi2c_read_nack(void);
@@ -42,3 +39,10 @@ uint8_t twi2c_receive(uint8_t address, uint8_t* data, uint16_t length);
 uint8_t twi2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length);
 uint8_t twi2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length);
 void twi2c_stop(void);
+
+uint8_t twi2c_reply(I2CDriver * i2cp, uint8_t * data, uint16_t length);
+uint8_t twi2c_transmit_receive(uint8_t address, uint8_t * tx_body, uint16_t tx_length, uint8_t * rx_body, uint16_t rx_length);
+uint8_t twi2c_start_listening(uint8_t address, twi2c_message_received callback);
+uint8_t twi2c_restart_listening(uint8_t address);
+
+#endif
diff --git a/drivers/qwiic/qwiic_keyboard.c b/drivers/qwiic/qwiic_keyboard.c
new file mode 100644
index 0000000000..088c70f848
--- /dev/null
+++ b/drivers/qwiic/qwiic_keyboard.c
@@ -0,0 +1,199 @@
+/* Copyright 2018 Jack Humbert
+ *
+ * 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 "qwiic_keyboard.h"
+#include "keymap.h"
+#include "matrix.h"
+#include "keyboard.h"
+#include "twi2c.h"
+#include 
+#include "usb_main.h"
+#include "usb_driver.h"
+
+#define QWIIC_KEYBOARD_LAYERS 16
+#define QWIIC_KEYBOARD_ROWS 8
+#define QWIIC_KEYBOARD_COLS 8
+
+#define qwiic_matrix_t uint8_t
+
+#define QWIIC_KEYBOARD_HANDSHAKE_ADDRESS       0b01010100
+#define QWIIC_KEYBOARD_LISTENING_ADDRESS_START 0b01010110
+#define QWIIC_KEYBOARD_HANDSHAKE_MESSAGE_SIZE  (QWIIC_KEYBOARD_LAYERS * QWIIC_KEYBOARD_ROWS * QWIIC_KEYBOARD_COLS)
+#define QWIIC_KEYBOARD_MATRIX_MESSAGE_SIZE     MATRIX_ROWS
+
+void qwiic_keyboard_write_keymap(uint8_t * pointer);
+void qwiic_keyboard_read_keymap(uint8_t * pointer);
+
+bool qwiic_keyboard_master = false;
+bool qwiic_keyboard_connected = false;
+uint8_t qwiic_keyboard_handshake_message[QWIIC_KEYBOARD_HANDSHAKE_MESSAGE_SIZE] = {0};
+uint8_t qwiic_keyboard_matrix_message[QWIIC_KEYBOARD_ROWS] = {0};
+twi2c_message_received qwiic_keyboard_message_received_ptr = qwiic_keyboard_message_received;
+
+uint16_t qwiic_keyboard_keymap[QWIIC_KEYBOARD_LAYERS][QWIIC_KEYBOARD_ROWS][QWIIC_KEYBOARD_COLS] = {0};
+uint8_t qwiic_keyboard_listening_address = QWIIC_KEYBOARD_LISTENING_ADDRESS_START;
+uint8_t qwiic_keyboard_processing_slave = false;
+
+void qwiic_keyboard_init(void) {
+  twi2c_init();
+  twi2c_start();
+  twi2c_start_listening(QWIIC_KEYBOARD_HANDSHAKE_ADDRESS, qwiic_keyboard_message_received_ptr);
+}
+
+void qwiic_keyboard_set_master(void) {
+  twi2c_stop();
+  twi2c_start();
+  qwiic_keyboard_master = true;
+}
+
+uint8_t command[1] = { 0x00 };
+
+void qwiic_keyboard_task(void) {
+  if (USB_DRIVER.state == USB_ACTIVE)
+    qwiic_keyboard_master = true;
+  else
+    qwiic_keyboard_master = false;
+  if (qwiic_keyboard_master) {
+    if (qwiic_keyboard_connected) {
+      // send empty message, expecting matrix info
+      if (MSG_OK == twi2c_transmit_receive(qwiic_keyboard_listening_address,
+        command, 1,
+        qwiic_keyboard_matrix_message, QWIIC_KEYBOARD_MATRIX_MESSAGE_SIZE
+      )) {
+        // majority of this is pulled from keyboard.c:keyboard_task()
+        static qwiic_matrix_t matrix_prev[QWIIC_KEYBOARD_ROWS];
+        qwiic_matrix_t matrix_row = 0;
+        qwiic_matrix_t matrix_change = 0;
+        qwiic_keyboard_processing_slave = true;
+        for (uint8_t r = 0; r < QWIIC_KEYBOARD_ROWS; r++) {
+          matrix_row = qwiic_keyboard_matrix_message[r];
+          matrix_change = matrix_row ^ matrix_prev[r];
+          if (matrix_change) {
+            for (uint8_t c = 0; c < QWIIC_KEYBOARD_COLS; c++) {
+              if (matrix_change & ((qwiic_matrix_t)1<= QMK_KEYS_PER_SCAN)
+                #endif
+                // process a key per task call
+                //goto MATRIX_LOOP_END;
+              }
+            }
+          }
+        }
+        // call with pseudo tick event when no real key event.
+        #ifdef QMK_KEYS_PER_SCAN
+          // we can get here with some keys processed now.
+          if (!keys_processed)
+        #endif
+        action_exec(TICK);
+        //MATRIX_LOOP_END:
+        qwiic_keyboard_processing_slave = false;
+      } else {
+        // disconnect
+        // qwiic_keyboard_connected = false;
+      }
+    } else { // if not connected
+      // send new address to listen on, expect back keymap
+      if (MSG_OK == twi2c_transmit_receive(QWIIC_KEYBOARD_HANDSHAKE_ADDRESS,
+        &qwiic_keyboard_listening_address, 1,
+        qwiic_keyboard_handshake_message, QWIIC_KEYBOARD_HANDSHAKE_MESSAGE_SIZE
+      )) {
+        qwiic_keyboard_connected = true;
+        // load keymap into memory
+        qwiic_keyboard_read_keymap(qwiic_keyboard_handshake_message);
+      }
+    }
+  }
+}
+
+float song_one_up[][2]  = SONG(ONE_UP_SOUND);
+bool first_message = true;
+
+void qwiic_keyboard_message_received(I2CDriver *i2cp, uint8_t * body, uint16_t size) {
+  if (qwiic_keyboard_connected) {
+    for (uint8_t row = 0; row < QWIIC_KEYBOARD_ROWS; row++) {
+      if (row < MATRIX_ROWS) {
+        qwiic_keyboard_matrix_message[row] = matrix_get_row(row);
+      } else {
+        qwiic_keyboard_matrix_message[row] = 0;
+      }
+    }
+    twi2c_reply(i2cp, qwiic_keyboard_matrix_message, QWIIC_KEYBOARD_MATRIX_MESSAGE_SIZE);
+    if (first_message) {
+      PLAY_SONG(song_one_up);
+      first_message = false;
+    }
+  } else {
+    qwiic_keyboard_connected = true;
+    qwiic_keyboard_master = false;
+    qwiic_keyboard_listening_address = body[0];
+    twi2c_restart_listening(qwiic_keyboard_listening_address);
+    qwiic_keyboard_write_keymap(qwiic_keyboard_handshake_message);
+    twi2c_reply(i2cp, qwiic_keyboard_handshake_message, QWIIC_KEYBOARD_HANDSHAKE_MESSAGE_SIZE);
+  }
+}
+
+// qwiic_keyboard_message_received_ptr = qwiic_keyboard_message_received;
+
+__attribute__((optimize("O0")))
+void qwiic_keyboard_write_keymap(uint8_t * pointer) {
+  for (uint8_t layer = 0; layer < QWIIC_KEYBOARD_LAYERS; layer++) {
+    for (uint8_t row = 0; row < QWIIC_KEYBOARD_ROWS; row++) {
+      for (uint8_t col = 0; col < QWIIC_KEYBOARD_COLS; col++) {
+        uint16_t keycode = pgm_read_word(&keymaps[layer][row][col]);
+        *pointer++ = (keycode >> 8);
+        *pointer++ = (keycode & 0xFF);
+      }
+    }
+  }
+}
+
+void qwiic_keyboard_read_keymap(uint8_t * pointer) {
+  for (uint8_t layer = 0; layer < QWIIC_KEYBOARD_LAYERS; layer++) {
+    for (uint8_t row = 0; row < QWIIC_KEYBOARD_ROWS; row++) {
+      for (uint8_t col = 0; col < QWIIC_KEYBOARD_COLS; col++) {
+        uint16_t keycode = *pointer++;
+        keycode |= ((*pointer++) << 8);
+        qwiic_keyboard_keymap[layer][row][col] = keycode;
+      }
+    }
+  }
+}
+
+// overwrite the built-in function - slaves don't need to process keycodes
+bool is_keyboard_master(void) {
+  return qwiic_keyboard_master;
+}
+
+// overwrite the built-in function
+uint16_t keymap_key_to_keycode(uint8_t layer, keypos_t key) {
+  if (qwiic_keyboard_processing_slave) {
+    // trick the built-in handling to accept our replacement keymap
+    //return qwiic_keyboard_keymap[(layer)][(key.row)][(key.col)];
+    return KC_A;
+  } else {
+    // Read entire word (16bits)
+    return pgm_read_word(&keymaps[(layer)][(key.row)][(key.col)]);
+  }
+}
diff --git a/drivers/qwiic/qwiic_keyboard.h b/drivers/qwiic/qwiic_keyboard.h
new file mode 100644
index 0000000000..813a02bb9e
--- /dev/null
+++ b/drivers/qwiic/qwiic_keyboard.h
@@ -0,0 +1,26 @@
+/* Copyright 2018 Jack Humbert
+ *
+ * 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 .
+ */
+
+#ifndef QWIIC_KEYBOARD_H
+#define QWIIC_KEYBOARD_H
+
+#include "quantum.h"
+
+void qwiic_keyboard_init(void);
+void qwiic_keyboard_task(void);
+void qwiic_keyboard_message_received(I2CDriver *i2cp, uint8_t * body, uint16_t size);
+
+#endif
diff --git a/keyboards/_qmk_handwire/keymaps/default/readme.md b/keyboards/_qmk_handwire/keymaps/default/readme.md
deleted file mode 100644
index 32d4bfba61..0000000000
--- a/keyboards/_qmk_handwire/keymaps/default/readme.md
+++ /dev/null
@@ -1 +0,0 @@
-# The default keymap for clueboard 60%
diff --git a/keyboards/muon_light/config.h b/keyboards/muon_light/config.h
index b4c7b6051b..b8df031a4a 100644
--- a/keyboards/muon_light/config.h
+++ b/keyboards/muon_light/config.h
@@ -149,4 +149,6 @@ along with this program.  If not, see .
 #define DRIVER_2_LED_TOTAL 24
 #define DRIVER_LED_TOTAL DRIVER_1_LED_TOTAL + DRIVER_2_LED_TOTAL
 
+#define NO_USB_STARTUP_CHECK
+
 #endif
diff --git a/keyboards/muon_light/halconf.h b/keyboards/muon_light/halconf.h
index c3e0cbb728..2e8eed14f4 100644
--- a/keyboards/muon_light/halconf.h
+++ b/keyboards/muon_light/halconf.h
@@ -79,6 +79,13 @@
 #define HAL_USE_I2C                 TRUE
 #endif
 
+/**
+ * @brief   Enables the I2C Slave subsystem.
+ */
+#if !defined(HAL_USE_I2C_SLAVE) || defined(__DOXYGEN__)
+#define HAL_USE_I2C_SLAVE           TRUE
+#endif
+
 /**
  * @brief   Enables the I2S subsystem.
  */
diff --git a/keyboards/muon_light/muon_light.c b/keyboards/muon_light/muon_light.c
index 1896a40c0d..9b6cbb824c 100644
--- a/keyboards/muon_light/muon_light.c
+++ b/keyboards/muon_light/muon_light.c
@@ -28,13 +28,13 @@ void matrix_scan_kb(void) {
   matrix_scan_user();
 }
 
-void suspend_power_down_kb(void) {
-  rgb_matrix_set_suspend_state(true);
-}
+// void suspend_power_down_kb(void) {
+//   rgb_matrix_set_suspend_state(true);
+// }
 
-void suspend_wakeup_init_kb(void) {
-  rgb_matrix_set_suspend_state(false);
-}
+// void suspend_wakeup_init_kb(void) {
+//   rgb_matrix_set_suspend_state(false);
+// }
 
 const uint8_t music_map[MATRIX_ROWS][MATRIX_COLS] = LAYOUT_ortho_4x6(
   18, 19, 20, 21, 22, 23,
@@ -43,73 +43,73 @@ const uint8_t music_map[MATRIX_ROWS][MATRIX_COLS] = LAYOUT_ortho_4x6(
   0,  1,  2,  3,  4,  5
 );
 
-const is31_led g_is31_leds[DRIVER_LED_TOTAL] = {
-/* Refer to IS31 manual for these locations
- *   driver
- *   |  R location
- *   |  |      G location
- *   |  |      |      B location
- *   |  |      |      | */
-    {0, C1_3,  C2_3,  C3_3},
-    {0, C1_4,  C2_4,  C3_4},
-    {0, C1_5,  C2_5,  C3_5},
-    {0, C1_11, C2_11, C3_11},
-    {0, C1_12, C2_12, C3_12},
-    {0, C1_13, C2_13, C3_13},
+// const is31_led g_is31_leds[DRIVER_LED_TOTAL] = {
+// /* Refer to IS31 manual for these locations
+//  *   driver
+//  *   |  R location
+//  *   |  |      G location
+//  *   |  |      |      B location
+//  *   |  |      |      | */
+//     {0, C1_3,  C2_3,  C3_3},
+//     {0, C1_4,  C2_4,  C3_4},
+//     {0, C1_5,  C2_5,  C3_5},
+//     {0, C1_11, C2_11, C3_11},
+//     {0, C1_12, C2_12, C3_12},
+//     {0, C1_13, C2_13, C3_13},
 
-    {0, C1_6,  C2_6,  C3_6},
-    {0, C1_7,  C2_7,  C3_7},
-    {0, C1_8,  C2_8,  C3_8},
-    {0, C1_14, C2_14, C3_14},
-    {0, C1_15, C2_15, C3_15},
-    {0, C1_16, C2_16, C3_16},
+//     {0, C1_6,  C2_6,  C3_6},
+//     {0, C1_7,  C2_7,  C3_7},
+//     {0, C1_8,  C2_8,  C3_8},
+//     {0, C1_14, C2_14, C3_14},
+//     {0, C1_15, C2_15, C3_15},
+//     {0, C1_16, C2_16, C3_16},
 
-    {0, C9_1,  C8_1,  C7_1},
-    {0, C9_2,  C8_2,  C7_2},
-    {0, C9_3,  C8_3,  C7_3},
-    {0, C9_9,  C8_9,  C7_9},
-    {0, C9_10, C8_10, C7_10},
-    {0, C9_11, C8_11, C7_11},
+//     {0, C9_1,  C8_1,  C7_1},
+//     {0, C9_2,  C8_2,  C7_2},
+//     {0, C9_3,  C8_3,  C7_3},
+//     {0, C9_9,  C8_9,  C7_9},
+//     {0, C9_10, C8_10, C7_10},
+//     {0, C9_11, C8_11, C7_11},
 
-    {0, C9_4,  C8_4,  C7_4},
-    {0, C9_5,  C8_5,  C7_5},
-    {0, C9_6,  C8_6,  C7_6},
-    {0, C9_12, C8_12, C7_12},
-    {0, C9_13, C8_13, C7_13},
-    {0, C9_14, C8_14, C7_14}
-};
+//     {0, C9_4,  C8_4,  C7_4},
+//     {0, C9_5,  C8_5,  C7_5},
+//     {0, C9_6,  C8_6,  C7_6},
+//     {0, C9_12, C8_12, C7_12},
+//     {0, C9_13, C8_13, C7_13},
+//     {0, C9_14, C8_14, C7_14}
+// };
 
-const rgb_led g_rgb_leds[DRIVER_LED_TOTAL] = {
+// const rgb_led g_rgb_leds[DRIVER_LED_TOTAL] = {
 
-    /*{row | col << 4}
-      |             {x=0..224, y=0..64}
-      |              |                 modifier
-      |              |                 | */
-    {{0|(0<<4)},   {20.36*0, 21.33*0}, 1},
-    {{0|(1<<4)},   {20.36*1, 21.33*0}, 0},
-    {{0|(2<<4)},   {20.36*2, 21.33*0}, 0},
-    {{0|(3<<4)},   {20.36*3, 21.33*0}, 0},
-    {{0|(4<<4)},   {20.36*4, 21.33*0}, 0},
-    {{0|(5<<4)},   {20.36*5, 21.33*0}, 0},
+//     {row | col << 4}
+//       |             {x=0..224, y=0..64}
+//       |              |                 modifier
+//       |              |                 |
+//     {{0|(0<<4)},   {20.36*0, 21.33*0}, 1},
+//     {{0|(1<<4)},   {20.36*1, 21.33*0}, 0},
+//     {{0|(2<<4)},   {20.36*2, 21.33*0}, 0},
+//     {{0|(3<<4)},   {20.36*3, 21.33*0}, 0},
+//     {{0|(4<<4)},   {20.36*4, 21.33*0}, 0},
+//     {{0|(5<<4)},   {20.36*5, 21.33*0}, 0},
 
-    {{1|(0<<4)},   {20.36*0, 21.33*1}, 1},
-    {{1|(1<<4)},   {20.36*1, 21.33*1}, 0},
-    {{1|(2<<4)},   {20.36*2, 21.33*1}, 0},
-    {{1|(3<<4)},   {20.36*3, 21.33*1}, 0},
-    {{1|(4<<4)},   {20.36*4, 21.33*1}, 0},
-    {{1|(5<<4)},   {20.36*5, 21.33*1}, 0},
+//     {{1|(0<<4)},   {20.36*0, 21.33*1}, 1},
+//     {{1|(1<<4)},   {20.36*1, 21.33*1}, 0},
+//     {{1|(2<<4)},   {20.36*2, 21.33*1}, 0},
+//     {{1|(3<<4)},   {20.36*3, 21.33*1}, 0},
+//     {{1|(4<<4)},   {20.36*4, 21.33*1}, 0},
+//     {{1|(5<<4)},   {20.36*5, 21.33*1}, 0},
 
-    {{2|(0<<4)},   {20.36*0, 21.33*2}, 1},
-    {{2|(1<<4)},   {20.36*1, 21.33*2}, 0},
-    {{2|(2<<4)},   {20.36*2, 21.33*2}, 0},
-    {{2|(3<<4)},   {20.36*3, 21.33*2}, 0},
-    {{2|(4<<4)},   {20.36*4, 21.33*2}, 0},
-    {{2|(5<<4)},   {20.36*5, 21.33*2}, 0},
+//     {{2|(0<<4)},   {20.36*0, 21.33*2}, 1},
+//     {{2|(1<<4)},   {20.36*1, 21.33*2}, 0},
+//     {{2|(2<<4)},   {20.36*2, 21.33*2}, 0},
+//     {{2|(3<<4)},   {20.36*3, 21.33*2}, 0},
+//     {{2|(4<<4)},   {20.36*4, 21.33*2}, 0},
+//     {{2|(5<<4)},   {20.36*5, 21.33*2}, 0},
 
-    {{3|(0<<4)},   {20.36*0, 21.33*3}, 1},
-    {{3|(1<<4)},   {20.36*1, 21.33*3}, 1},
-    {{3|(2<<4)},   {20.36*2, 21.33*3}, 1},
-    {{3|(3<<4)},   {20.36*3, 21.33*3}, 1},
-    {{3|(4<<4)},   {20.36*4, 21.33*3}, 1},
-    {{3|(5<<4)},   {20.36*5, 21.33*3}, 0}
-};
+//     {{3|(0<<4)},   {20.36*0, 21.33*3}, 1},
+//     {{3|(1<<4)},   {20.36*1, 21.33*3}, 1},
+//     {{3|(2<<4)},   {20.36*2, 21.33*3}, 1},
+//     {{3|(3<<4)},   {20.36*3, 21.33*3}, 1},
+//     {{3|(4<<4)},   {20.36*4, 21.33*3}, 1},
+//     {{3|(5<<4)},   {20.36*5, 21.33*3}, 0}
+// };
diff --git a/keyboards/muon_light/rules.mk b/keyboards/muon_light/rules.mk
index 7047f6566e..4cca7a3b0c 100644
--- a/keyboards/muon_light/rules.mk
+++ b/keyboards/muon_light/rules.mk
@@ -51,12 +51,13 @@ COMMAND_ENABLE = yes    # Commands for debug and configuration
 NKRO_ENABLE = yes     # USB Nkey Rollover
 CUSTOM_MATRIX = yes # Custom matrix file
 AUDIO_ENABLE = yes
-RGB_MATRIX_ENABLE = yes
-ENCODER_ENABLE = yes
+# RGB_MATRIX_ENABLE = yes
+# ENCODER_ENABLE = yes
 # SERIAL_LINK_ENABLE = yes
+I2C_SLAVE_ENABLE = yes
+QWIIC_KEYBOARD_ENABLE = yes
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
 SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
 
 LAYOUTS = ortho_4x6
-LAYOUTS_HAS_RGB = no
diff --git a/keyboards/_qmk_handwire/boards/GENERIC_STM32_F303XC/board.c b/keyboards/proton_c/boards/GENERIC_STM32_F303XC/board.c
similarity index 100%
rename from keyboards/_qmk_handwire/boards/GENERIC_STM32_F303XC/board.c
rename to keyboards/proton_c/boards/GENERIC_STM32_F303XC/board.c
diff --git a/keyboards/_qmk_handwire/boards/GENERIC_STM32_F303XC/board.h b/keyboards/proton_c/boards/GENERIC_STM32_F303XC/board.h
similarity index 100%
rename from keyboards/_qmk_handwire/boards/GENERIC_STM32_F303XC/board.h
rename to keyboards/proton_c/boards/GENERIC_STM32_F303XC/board.h
diff --git a/keyboards/_qmk_handwire/boards/GENERIC_STM32_F303XC/board.mk b/keyboards/proton_c/boards/GENERIC_STM32_F303XC/board.mk
similarity index 100%
rename from keyboards/_qmk_handwire/boards/GENERIC_STM32_F303XC/board.mk
rename to keyboards/proton_c/boards/GENERIC_STM32_F303XC/board.mk
diff --git a/keyboards/_qmk_handwire/bootloader_defs.h b/keyboards/proton_c/bootloader_defs.h
similarity index 100%
rename from keyboards/_qmk_handwire/bootloader_defs.h
rename to keyboards/proton_c/bootloader_defs.h
diff --git a/keyboards/_qmk_handwire/chconf.h b/keyboards/proton_c/chconf.h
similarity index 100%
rename from keyboards/_qmk_handwire/chconf.h
rename to keyboards/proton_c/chconf.h
diff --git a/keyboards/_qmk_handwire/config.h b/keyboards/proton_c/config.h
similarity index 98%
rename from keyboards/_qmk_handwire/config.h
rename to keyboards/proton_c/config.h
index fe0ad1d5c4..ad14553bed 100644
--- a/keyboards/_qmk_handwire/config.h
+++ b/keyboards/proton_c/config.h
@@ -23,8 +23,8 @@
 #define PRODUCT_ID      0x1770
 #define DEVICE_VER      0x0001
 #define MANUFACTURER    QMK
-#define PRODUCT         Handwire
-#define DESCRIPTION     "Handwire protoboard"
+#define PRODUCT         Proton C
+#define DESCRIPTION     "Proton C protoboard"
 
 /* key matrix size */
 #define MATRIX_ROWS 12
diff --git a/keyboards/_qmk_handwire/halconf.h b/keyboards/proton_c/halconf.h
similarity index 100%
rename from keyboards/_qmk_handwire/halconf.h
rename to keyboards/proton_c/halconf.h
diff --git a/keyboards/_qmk_handwire/keymaps/default/keymap.c b/keyboards/proton_c/keymaps/default/keymap.c
similarity index 99%
rename from keyboards/_qmk_handwire/keymaps/default/keymap.c
rename to keyboards/proton_c/keymaps/default/keymap.c
index 168be875c2..ee2b13e588 100644
--- a/keyboards/_qmk_handwire/keymaps/default/keymap.c
+++ b/keyboards/proton_c/keymaps/default/keymap.c
@@ -1,4 +1,4 @@
-#include "_qmk_handwire.h"
+#include QMK_KEYBOARD_H
 
 #define _______ KC_TRNS
 
diff --git a/keyboards/proton_c/keymaps/default/readme.md b/keyboards/proton_c/keymaps/default/readme.md
new file mode 100644
index 0000000000..3aec70f621
--- /dev/null
+++ b/keyboards/proton_c/keymaps/default/readme.md
@@ -0,0 +1 @@
+# The default keymap for the Proton C
diff --git a/keyboards/_qmk_handwire/led.c b/keyboards/proton_c/led.c
similarity index 100%
rename from keyboards/_qmk_handwire/led.c
rename to keyboards/proton_c/led.c
diff --git a/keyboards/_qmk_handwire/matrix.c b/keyboards/proton_c/matrix.c
similarity index 100%
rename from keyboards/_qmk_handwire/matrix.c
rename to keyboards/proton_c/matrix.c
diff --git a/keyboards/_qmk_handwire/mcuconf.h b/keyboards/proton_c/mcuconf.h
similarity index 100%
rename from keyboards/_qmk_handwire/mcuconf.h
rename to keyboards/proton_c/mcuconf.h
diff --git a/keyboards/_qmk_handwire/_qmk_handwire.c b/keyboards/proton_c/proton_c.c
similarity index 96%
rename from keyboards/_qmk_handwire/_qmk_handwire.c
rename to keyboards/proton_c/proton_c.c
index a7f460b1a9..33ba31a080 100644
--- a/keyboards/_qmk_handwire/_qmk_handwire.c
+++ b/keyboards/proton_c/proton_c.c
@@ -14,7 +14,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see .
  */
-#include "_qmk_handwire.h"
+#include "proton_c.h"
 
 void matrix_init_kb(void) {
 
diff --git a/keyboards/_qmk_handwire/_qmk_handwire.h b/keyboards/proton_c/proton_c.h
similarity index 93%
rename from keyboards/_qmk_handwire/_qmk_handwire.h
rename to keyboards/proton_c/proton_c.h
index f482861f9a..d3d1049c6d 100644
--- a/keyboards/_qmk_handwire/_qmk_handwire.h
+++ b/keyboards/proton_c/proton_c.h
@@ -14,15 +14,15 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see .
  */
-#ifndef QMK_HANDWIRE_H
-#define QMK_HANDWIRE_H
+#ifndef PROTON_C_H
+#define PROTON_C_H
 
 #include "quantum.h"
 
 /*
- * These are shortcuts to help you work with the various layout options. If your 
+ * These are shortcuts to help you work with the various layout options. If your
  * keymap works with one of the LAYOUT_...() macros you are encouraged to use that
- * and to contribute your keymap to the corresponding layout in 
+ * and to contribute your keymap to the corresponding layout in
  * `qmk_firmware/layouts/community`.
  */
 
@@ -56,4 +56,4 @@
     { k50, k51, k52, 0,   0,   0,   0   } \
 }
 
-#endif
\ No newline at end of file
+#endif
diff --git a/keyboards/_qmk_handwire/readme.md b/keyboards/proton_c/readme.md
similarity index 83%
rename from keyboards/_qmk_handwire/readme.md
rename to keyboards/proton_c/readme.md
index d74c3aa52d..e133cd9e0f 100644
--- a/keyboards/_qmk_handwire/readme.md
+++ b/keyboards/proton_c/readme.md
@@ -1,14 +1,14 @@
-# QMK Handwire
+# Proton C
 
 An Arm-based handwire board.
 
 * Keyboard Maintainer: [Jack Humbert](https://github.com/jackhumbert)
-* Hardware Supported: QMK Handwire
+* Hardware Supported: QMK Proton C
   * rev1 (1.0)
 * Hardware Availability: [qmk.fm](https://qmk.fm/)
 
 Make example for this keyboard (after setting up your build environment):
 
-    make _qmk_handwire:default
+    make proton_c:default
 
 See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
diff --git a/keyboards/_qmk_handwire/rules.mk b/keyboards/proton_c/rules.mk
similarity index 100%
rename from keyboards/_qmk_handwire/rules.mk
rename to keyboards/proton_c/rules.mk
diff --git a/lib/chibios b/lib/chibios
index 587968d6cb..c846437e39 160000
--- a/lib/chibios
+++ b/lib/chibios
@@ -1 +1 @@
-Subproject commit 587968d6cbc2b0e1c7147540872f2a67e59ca18b
+Subproject commit c846437e39423ef9394aecd3a96393db24c51ebf
diff --git a/tmk_core/common/keyboard.c b/tmk_core/common/keyboard.c
index 4eff764e2d..07f6c6eb33 100644
--- a/tmk_core/common/keyboard.c
+++ b/tmk_core/common/keyboard.c
@@ -69,6 +69,9 @@ along with this program.  If not, see .
 #ifdef MIDI_ENABLE
 #   include "process_midi.h"
 #endif
+#ifdef QWIIC_KEYBOARD_ENABLE
+#   include "qwiic/qwiic_keyboard.h"
+#endif
 
 #ifdef MATRIX_HAS_GHOST
 extern const uint16_t keymaps[][MATRIX_ROWS][MATRIX_COLS];
@@ -181,11 +184,14 @@ void keyboard_init(void) {
 #if defined(NKRO_ENABLE) && defined(FORCE_NKRO)
     keymap_config.nkro = 1;
 #endif
+#ifdef QWIIC_KEYBOARD_ENABLE
+    qwiic_keyboard_init();
+#endif
 }
 
 /** \brief Keyboard task: Do keyboard routine jobs
  *
- * Do routine keyboard jobs: 
+ * Do routine keyboard jobs:
  *
  * * scan matrix
  * * handle mouse movements
@@ -291,6 +297,10 @@ MATRIX_LOOP_END:
     midi_task();
 #endif
 
+#ifdef QWIIC_KEYBOARD_ENABLE
+    qwiic_keyboard_task();
+#endif
+
     // update LED
     if (led_status != host_keyboard_leds()) {
         led_status = host_keyboard_leds();