summaryrefslogtreecommitdiffstats
path: root/platforms
diff options
context:
space:
mode:
Diffstat (limited to 'platforms')
-rw-r--r--platforms/arm_atsam/bootloaders/md_boot.c (renamed from platforms/arm_atsam/bootloader.c)38
-rw-r--r--platforms/arm_atsam/gpio.h12
-rw-r--r--platforms/arm_atsam/suspend.c7
-rw-r--r--platforms/avr/bootloader.c293
-rw-r--r--platforms/avr/bootloaders/bootloadhid.c33
-rw-r--r--platforms/avr/bootloaders/caterina.c39
-rw-r--r--platforms/avr/bootloaders/dfu.c52
-rw-r--r--platforms/avr/bootloaders/halfkay.c128
-rw-r--r--platforms/avr/bootloaders/none.c (renamed from platforms/chibios/boards/GENERIC_STM32_G431XB/configs/config.h)14
-rw-r--r--platforms/avr/bootloaders/usbasploader.c56
-rw-r--r--platforms/avr/drivers/i2c_master.c7
-rw-r--r--platforms/avr/drivers/serial.c46
-rw-r--r--platforms/avr/gpio.h17
-rw-r--r--platforms/avr/suspend.c13
-rw-r--r--platforms/chibios/boards/BLACKPILL_STM32_F401/configs/bootloader_defs.h5
-rw-r--r--platforms/chibios/boards/BLACKPILL_STM32_F411/configs/bootloader_defs.h5
-rw-r--r--platforms/chibios/boards/GENERIC_STM32_F042X6/configs/bootloader_defs.h5
-rw-r--r--platforms/chibios/boards/GENERIC_STM32_F072XB/configs/bootloader_defs.h5
-rw-r--r--platforms/chibios/boards/GENERIC_STM32_F303XC/configs/bootloader_defs.h5
-rw-r--r--platforms/chibios/boards/GENERIC_STM32_F405XG/configs/config.h2
-rw-r--r--platforms/chibios/boards/GENERIC_STM32_F407XE/configs/config.h2
-rw-r--r--platforms/chibios/boards/GENERIC_STM32_F446XE/configs/config.h2
-rw-r--r--platforms/chibios/boards/GENERIC_STM32_L412XB/configs/config.h1
-rw-r--r--platforms/chibios/boards/GENERIC_STM32_L432XC/board/board.mk9
-rw-r--r--platforms/chibios/boards/GENERIC_STM32_L432XC/configs/config.h10
-rw-r--r--platforms/chibios/boards/GENERIC_STM32_L432XC/configs/mcuconf.h267
-rw-r--r--platforms/chibios/boards/GENERIC_STM32_L433XC/configs/config.h1
-rw-r--r--platforms/chibios/boards/GENERIC_WB32_F3G71XX/configs/bootloader_defs.h12
-rw-r--r--platforms/chibios/boards/QMK_PROTON_C/configs/bootloader_defs.h7
-rw-r--r--platforms/chibios/bootloader.c145
-rw-r--r--platforms/chibios/bootloaders/gd32v_dfu.c40
-rw-r--r--platforms/chibios/bootloaders/halfkay.c25
-rw-r--r--platforms/chibios/bootloaders/kiibohd.c32
-rw-r--r--platforms/chibios/bootloaders/none.c23
-rw-r--r--platforms/chibios/bootloaders/stm32_dfu.c94
-rw-r--r--platforms/chibios/bootloaders/stm32duino.c21
-rw-r--r--platforms/chibios/bootloaders/tinyuf2.c34
-rw-r--r--platforms/chibios/drivers/i2c_master.c59
-rw-r--r--platforms/chibios/drivers/i2c_master.h61
-rw-r--r--platforms/chibios/drivers/serial.c19
-rw-r--r--platforms/chibios/drivers/serial_usart.c32
-rw-r--r--platforms/chibios/eeprom_teensy.c59
-rw-r--r--platforms/chibios/gpio.h24
-rw-r--r--platforms/chibios/suspend.c9
-rw-r--r--platforms/common.mk2
-rw-r--r--platforms/suspend.h1
-rw-r--r--platforms/test/bootloaders/none.c (renamed from platforms/test/bootloader.c)0
47 files changed, 1002 insertions, 771 deletions
diff --git a/platforms/arm_atsam/bootloader.c b/platforms/arm_atsam/bootloaders/md_boot.c
index 9015b00aab..9cf16f3597 100644
--- a/platforms/arm_atsam/bootloader.c
+++ b/platforms/arm_atsam/bootloaders/md_boot.c
@@ -15,13 +15,17 @@
*/
#include "bootloader.h"
+
#include "samd51j18a.h"
-#include "md_bootloader.h"
-// Set watchdog timer to reset. Directs the bootloader to stay in programming mode.
+// WARNING: These are only for CTRL bootloader release "v2.18Jun 22 2018 17:28:08" for bootloader_jump support
+extern uint32_t _eram;
+#define BOOTLOADER_MAGIC 0x3B9ACA00
+#define MAGIC_ADDR (uint32_t *)((intptr_t)(&_eram) - 4)
+
+// CTRL keyboards released with bootloader version below must use RAM method. Otherwise use WDT method.
void bootloader_jump(void) {
#ifdef KEYBOARD_massdrop_ctrl
- // CTRL keyboards released with bootloader version below must use RAM method. Otherwise use WDT method.
uint8_t ver_ram_method[] = "v2.18Jun 22 2018 17:28:08"; // The version to match (NULL terminated by compiler)
uint8_t *ver_check = ver_ram_method; // Pointer to version match string for traversal
uint8_t *ver_rom = (uint8_t *)0x21A0; // Pointer to address in ROM where this specific bootloader version would exist
@@ -34,24 +38,28 @@ void bootloader_jump(void) {
if (!*ver_check) { // If check version pointer is NULL, all characters have matched
*MAGIC_ADDR = BOOTLOADER_MAGIC; // Set magic number into RAM
NVIC_SystemReset(); // Perform system reset
- while (1) {
- } // Won't get here
+ while (1)
+ ; // Won't get here
}
#endif
+ // Set watchdog timer to reset. Directs the bootloader to stay in programming mode.
WDT->CTRLA.bit.ENABLE = 0;
- while (WDT->SYNCBUSY.bit.ENABLE) {
- }
- while (WDT->CTRLA.bit.ENABLE) {
- }
+
+ while (WDT->SYNCBUSY.bit.ENABLE)
+ ;
+ while (WDT->CTRLA.bit.ENABLE)
+ ;
+
WDT->CONFIG.bit.WINDOW = 0;
WDT->CONFIG.bit.PER = 0;
WDT->EWCTRL.bit.EWOFFSET = 0;
WDT->CTRLA.bit.ENABLE = 1;
- while (WDT->SYNCBUSY.bit.ENABLE) {
- }
- while (!WDT->CTRLA.bit.ENABLE) {
- }
- while (1) {
- } // Wait on timeout
+
+ while (WDT->SYNCBUSY.bit.ENABLE)
+ ;
+ while (!WDT->CTRLA.bit.ENABLE)
+ ;
+ while (1)
+ ; // Wait on timeout
}
diff --git a/platforms/arm_atsam/gpio.h b/platforms/arm_atsam/gpio.h
index 915ed0ef4f..a42aaff54d 100644
--- a/platforms/arm_atsam/gpio.h
+++ b/platforms/arm_atsam/gpio.h
@@ -22,9 +22,9 @@
typedef uint8_t pin_t;
-#define SAMD_PORT(pin) ((pin & 0x20) >> 5)
-#define SAMD_PIN(pin) (pin & 0x1f)
-#define SAMD_PIN_MASK(pin) (1 << (pin & 0x1f))
+#define SAMD_PORT(pin) (((pin)&0x20) >> 5)
+#define SAMD_PIN(pin) ((pin)&0x1f)
+#define SAMD_PIN_MASK(pin) (1 << ((pin)&0x1f))
#define setPinInput(pin) \
do { \
@@ -48,12 +48,16 @@ typedef uint8_t pin_t;
PORT->Group[SAMD_PORT(pin)].PINCFG[SAMD_PIN(pin)].bit.PULLEN = 1; \
} while (0)
-#define setPinOutput(pin) \
+#define setPinOutputPushPull(pin) \
do { \
PORT->Group[SAMD_PORT(pin)].DIRSET.reg = SAMD_PIN_MASK(pin); \
PORT->Group[SAMD_PORT(pin)].OUTCLR.reg = SAMD_PIN_MASK(pin); \
} while (0)
+#define setPinOutputOpenDrain(pin) _Static_assert(0, "arm_atsam platform does not implement an open-drain output")
+
+#define setPinOutput(pin) setPinOutputPushPull(pin)
+
#define writePinHigh(pin) \
do { \
PORT->Group[SAMD_PORT(pin)].OUTSET.reg = SAMD_PIN_MASK(pin); \
diff --git a/platforms/arm_atsam/suspend.c b/platforms/arm_atsam/suspend.c
index e51426128d..73bebc4308 100644
--- a/platforms/arm_atsam/suspend.c
+++ b/platforms/arm_atsam/suspend.c
@@ -3,13 +3,6 @@
#include "md_rgb_matrix.h"
#include "suspend.h"
-/** \brief Suspend idle
- *
- * FIXME: needs doc
- */
-void suspend_idle(uint8_t time) { /* Note: Not used anywhere currently */
-}
-
/** \brief Run user level Power down
*
* FIXME: needs doc
diff --git a/platforms/avr/bootloader.c b/platforms/avr/bootloader.c
deleted file mode 100644
index c0272903b8..0000000000
--- a/platforms/avr/bootloader.c
+++ /dev/null
@@ -1,293 +0,0 @@
-#include <stdint.h>
-#include <stdbool.h>
-#include <avr/io.h>
-#include <avr/eeprom.h>
-#include <avr/interrupt.h>
-#include <avr/wdt.h>
-#include <util/delay.h>
-#include "bootloader.h"
-#include <avr/boot.h>
-
-#ifdef PROTOCOL_LUFA
-# include <LUFA/Drivers/USB/USB.h>
-#endif
-
-/** \brief Bootloader Size in *bytes*
- *
- * AVR Boot section size are defined by setting BOOTSZ fuse in fact. Consult with your MCU datasheet.
- * Note that 'Word'(2 bytes) size and address are used in datasheet while TMK uses 'Byte'.
- *
- * Size of Bootloaders in bytes:
- * Atmel DFU loader(ATmega32U4) 4096
- * Atmel DFU loader(AT90USB128) 8192
- * LUFA bootloader(ATmega32U4) 4096
- * Arduino Caterina(ATmega32U4) 4096
- * USBaspLoader(ATmega***) 2048
- * Teensy halfKay(ATmega32U4) 512
- * Teensy++ halfKay(AT90USB128) 1024
- *
- * AVR Boot section is located at the end of Flash memory like the followings.
- *
- * byte Atmel/LUFA(ATMega32u4) byte Atmel(AT90SUB128)
- * 0x0000 +---------------+ 0x00000 +---------------+
- * | | | |
- * | | | |
- * | Application | | Application |
- * | | | |
- * = = = =
- * | | 32KB-4KB | | 128KB-8KB
- * 0x7000 +---------------+ 0x1E000 +---------------+
- * | Bootloader | 4KB | Bootloader | 8KB
- * 0x7FFF +---------------+ 0x1FFFF +---------------+
- *
- *
- * byte Teensy(ATMega32u4) byte Teensy++(AT90SUB128)
- * 0x0000 +---------------+ 0x00000 +---------------+
- * | | | |
- * | | | |
- * | Application | | Application |
- * | | | |
- * = = = =
- * | | 32KB-512B | | 128KB-1KB
- * 0x7E00 +---------------+ 0x1FC00 +---------------+
- * | Bootloader | 512B | Bootloader | 1KB
- * 0x7FFF +---------------+ 0x1FFFF +---------------+
- */
-#define FLASH_SIZE (FLASHEND + 1L)
-
-#if !defined(BOOTLOADER_SIZE)
-uint16_t bootloader_start;
-#endif
-
-// compatibility between ATMega8 and ATMega88
-#if !defined(MCUCSR)
-# if defined(MCUSR)
-# define MCUCSR MCUSR
-# endif
-#endif
-
-/** \brief Entering the Bootloader via Software
- *
- * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
- */
-#define BOOTLOADER_RESET_KEY 0xB007B007
-uint32_t reset_key __attribute__((section(".noinit,\"aw\",@nobits;")));
-
-/** \brief initialize MCU status by watchdog reset
- *
- * FIXME: needs doc
- */
-__attribute__((weak)) void bootloader_jump(void) {
-#if !defined(BOOTLOADER_SIZE)
- uint8_t high_fuse = boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS);
-
- if (high_fuse & ~(FUSE_BOOTSZ0 & FUSE_BOOTSZ1)) {
- bootloader_start = (FLASH_SIZE - 512) >> 1;
- } else if (high_fuse & ~(FUSE_BOOTSZ1)) {
- bootloader_start = (FLASH_SIZE - 1024) >> 1;
- } else if (high_fuse & ~(FUSE_BOOTSZ0)) {
- bootloader_start = (FLASH_SIZE - 2048) >> 1;
- } else {
- bootloader_start = (FLASH_SIZE - 4096) >> 1;
- }
-#endif
-
- // Something like this might work, but it compiled larger than the block above
- // bootloader_start = FLASH_SIZE - (256 << (~high_fuse & 0b110 >> 1));
-
-#if defined(BOOTLOADER_HALFKAY)
- // http://www.pjrc.com/teensy/jump_to_bootloader.html
- cli();
- // disable watchdog, if enabled (it's not)
- // disable all peripherals
- // a shutdown call might make sense here
- UDCON = 1;
- USBCON = (1 << FRZCLK); // disable USB
- UCSR1B = 0;
- _delay_ms(5);
-# if defined(__AVR_AT90USB162__) // Teensy 1.0
- EIMSK = 0;
- PCICR = 0;
- SPCR = 0;
- ACSR = 0;
- EECR = 0;
- TIMSK0 = 0;
- TIMSK1 = 0;
- UCSR1B = 0;
- DDRB = 0;
- DDRC = 0;
- DDRD = 0;
- PORTB = 0;
- PORTC = 0;
- PORTD = 0;
- asm volatile("jmp 0x3E00");
-# elif defined(__AVR_ATmega32U4__) // Teensy 2.0
- EIMSK = 0;
- PCICR = 0;
- SPCR = 0;
- ACSR = 0;
- EECR = 0;
- ADCSRA = 0;
- TIMSK0 = 0;
- TIMSK1 = 0;
- TIMSK3 = 0;
- TIMSK4 = 0;
- UCSR1B = 0;
- TWCR = 0;
- DDRB = 0;
- DDRC = 0;
- DDRD = 0;
- DDRE = 0;
- DDRF = 0;
- TWCR = 0;
- PORTB = 0;
- PORTC = 0;
- PORTD = 0;
- PORTE = 0;
- PORTF = 0;
- asm volatile("jmp 0x7E00");
-# elif defined(__AVR_AT90USB646__) // Teensy++ 1.0
- EIMSK = 0;
- PCICR = 0;
- SPCR = 0;
- ACSR = 0;
- EECR = 0;
- ADCSRA = 0;
- TIMSK0 = 0;
- TIMSK1 = 0;
- TIMSK2 = 0;
- TIMSK3 = 0;
- UCSR1B = 0;
- TWCR = 0;
- DDRA = 0;
- DDRB = 0;
- DDRC = 0;
- DDRD = 0;
- DDRE = 0;
- DDRF = 0;
- PORTA = 0;
- PORTB = 0;
- PORTC = 0;
- PORTD = 0;
- PORTE = 0;
- PORTF = 0;
- asm volatile("jmp 0xFC00");
-# elif defined(__AVR_AT90USB1286__) // Teensy++ 2.0
- EIMSK = 0;
- PCICR = 0;
- SPCR = 0;
- ACSR = 0;
- EECR = 0;
- ADCSRA = 0;
- TIMSK0 = 0;
- TIMSK1 = 0;
- TIMSK2 = 0;
- TIMSK3 = 0;
- UCSR1B = 0;
- TWCR = 0;
- DDRA = 0;
- DDRB = 0;
- DDRC = 0;
- DDRD = 0;
- DDRE = 0;
- DDRF = 0;
- PORTA = 0;
- PORTB = 0;
- PORTC = 0;
- PORTD = 0;
- PORTE = 0;
- PORTF = 0;
- asm volatile("jmp 0x1FC00");
-# endif
-
-#elif defined(BOOTLOADER_CATERINA)
- // this block may be optional
- // TODO: figure it out
-
- uint16_t *const bootKeyPtr = (uint16_t *)0x0800;
-
- // Value used by Caterina bootloader use to determine whether to run the
- // sketch or the bootloader programmer.
- uint16_t bootKey = 0x7777;
-
- *bootKeyPtr = bootKey;
-
- // setup watchdog timeout
- wdt_enable(WDTO_60MS);
-
- while (1) {
- } // wait for watchdog timer to trigger
-
-#elif defined(BOOTLOADER_USBASP)
- // Taken with permission of Stephan Baerwolf from https://github.com/tinyusbboard/API/blob/master/apipage.c
- wdt_enable(WDTO_15MS);
- wdt_reset();
- asm volatile("cli \n\t"
- "ldi r29 , %[ramendhi] \n\t"
- "ldi r28 , %[ramendlo] \n\t"
-# if (FLASHEND > 131071)
- "ldi r18 , %[bootaddrhi] \n\t"
- "st Y+, r18 \n\t"
-# endif
- "ldi r18 , %[bootaddrme] \n\t"
- "st Y+, r18 \n\t"
- "ldi r18 , %[bootaddrlo] \n\t"
- "st Y+, r18 \n\t"
- "out %[mcucsrio], __zero_reg__ \n\t"
- "bootloader_startup_loop%=: \n\t"
- "rjmp bootloader_startup_loop%= \n\t"
- :
- : [mcucsrio] "I"(_SFR_IO_ADDR(MCUCSR)),
-# if (FLASHEND > 131071)
- [ramendhi] "M"(((RAMEND - 2) >> 8) & 0xff), [ramendlo] "M"(((RAMEND - 2) >> 0) & 0xff), [bootaddrhi] "M"((((FLASH_SIZE - BOOTLOADER_SIZE) >> 1) >> 16) & 0xff),
-# else
- [ramendhi] "M"(((RAMEND - 1) >> 8) & 0xff), [ramendlo] "M"(((RAMEND - 1) >> 0) & 0xff),
-# endif
- [bootaddrme] "M"((((FLASH_SIZE - BOOTLOADER_SIZE) >> 1) >> 8) & 0xff), [bootaddrlo] "M"((((FLASH_SIZE - BOOTLOADER_SIZE) >> 1) >> 0) & 0xff));
-
-#else // Assume remaining boards are DFU, even if the flag isn't set
-
-# if !(defined(__AVR_ATmega32A__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__) || defined(__AVR_ATtiny85__)) // no USB - maybe BOOTLOADER_BOOTLOADHID instead though?
- UDCON = 1;
- USBCON = (1 << FRZCLK); // disable USB
- UCSR1B = 0;
- _delay_ms(5); // 5 seems to work fine
-# endif
-
-# ifdef BOOTLOADER_BOOTLOADHID
- // force bootloadHID to stay in bootloader mode, so that it waits
- // for a new firmware to be flashed
- eeprom_write_byte((uint8_t *)1, 0x00);
-# endif
-
- // watchdog reset
- reset_key = BOOTLOADER_RESET_KEY;
- wdt_enable(WDTO_250MS);
- for (;;)
- ;
-#endif
-}
-
-/* this runs before main() */
-void bootloader_jump_after_watchdog_reset(void) __attribute__((used, naked, section(".init3")));
-void bootloader_jump_after_watchdog_reset(void) {
-#ifndef BOOTLOADER_HALFKAY
- if ((MCUCSR & (1 << WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
- reset_key = 0;
-
- // My custom USBasploader requires this to come up.
- MCUCSR = 0;
-
- // Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog.
- MCUCSR &= ~(1 << WDRF);
- wdt_disable();
-
-// This is compled into 'icall', address should be in word unit, not byte.
-# ifdef BOOTLOADER_SIZE
- ((void (*)(void))((FLASH_SIZE - BOOTLOADER_SIZE) >> 1))();
-# else
- asm("ijmp" ::"z"(bootloader_start));
-# endif
- }
-#endif
-}
diff --git a/platforms/avr/bootloaders/bootloadhid.c b/platforms/avr/bootloaders/bootloadhid.c
new file mode 100644
index 0000000000..ae58760d7d
--- /dev/null
+++ b/platforms/avr/bootloaders/bootloadhid.c
@@ -0,0 +1,33 @@
+/* Copyright 2021 QMK
+ *
+ * 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 3 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "bootloader.h"
+
+#include <avr/eeprom.h>
+#include <avr/wdt.h>
+
+__attribute__((weak)) void bootloader_jump(void) {
+ // force bootloadHID to stay in bootloader mode, so that it waits
+ // for a new firmware to be flashed
+ // NOTE: this byte is part of QMK's "magic number" - changing it causes the EEPROM to be re-initialized
+ // thus every time the device is flashed the EEPROM will be wiped
+ eeprom_write_byte((uint8_t *)1, 0x00);
+
+ // watchdog reset
+ wdt_enable(WDTO_250MS);
+ for (;;)
+ ;
+}
diff --git a/platforms/avr/bootloaders/caterina.c b/platforms/avr/bootloaders/caterina.c
new file mode 100644
index 0000000000..82a16a3765
--- /dev/null
+++ b/platforms/avr/bootloaders/caterina.c
@@ -0,0 +1,39 @@
+/* Copyright 2021 QMK
+ *
+ * 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 3 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "bootloader.h"
+
+#include <avr/wdt.h>
+
+__attribute__((weak)) void bootloader_jump(void) {
+ // this block may be optional
+ // TODO: figure it out
+
+ uint16_t *const bootKeyPtr = (uint16_t *)0x0800;
+
+ // Value used by Caterina bootloader use to determine whether to run the
+ // sketch or the bootloader programmer.
+ uint16_t bootKey = 0x7777;
+
+ *bootKeyPtr = bootKey;
+
+ // setup watchdog timeout
+ wdt_enable(WDTO_60MS);
+
+ // wait for watchdog timer to trigger
+ while (1) {
+ }
+}
diff --git a/platforms/avr/bootloaders/dfu.c b/platforms/avr/bootloaders/dfu.c
new file mode 100644
index 0000000000..cb42821a93
--- /dev/null
+++ b/platforms/avr/bootloaders/dfu.c
@@ -0,0 +1,52 @@
+/* Copyright 2021 QMK
+ *
+ * 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 3 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "bootloader.h"
+
+#include <avr/wdt.h>
+#include <util/delay.h>
+
+#define FLASH_SIZE (FLASHEND + 1L)
+
+/** \brief Entering the Bootloader via Software
+ *
+ * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
+ */
+#define BOOTLOADER_RESET_KEY 0xB007B007
+uint32_t reset_key __attribute__((section(".noinit,\"aw\",@nobits;")));
+
+__attribute__((weak)) void bootloader_jump(void) {
+ UDCON = 1;
+ USBCON = (1 << FRZCLK); // disable USB
+ UCSR1B = 0;
+ _delay_ms(5); // 5 seems to work fine
+
+ // watchdog reset
+ reset_key = BOOTLOADER_RESET_KEY;
+ wdt_enable(WDTO_250MS);
+ for (;;)
+ ;
+}
+
+/* this runs before main() */
+void bootloader_jump_after_watchdog_reset(void) __attribute__((used, naked, section(".init3")));
+void bootloader_jump_after_watchdog_reset(void) {
+ if ((MCUSR & (1 << WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
+ reset_key = 0;
+
+ ((void (*)(void))((FLASH_SIZE - BOOTLOADER_SIZE) >> 1))();
+ }
+}
diff --git a/platforms/avr/bootloaders/halfkay.c b/platforms/avr/bootloaders/halfkay.c
new file mode 100644
index 0000000000..6ce2e19114
--- /dev/null
+++ b/platforms/avr/bootloaders/halfkay.c
@@ -0,0 +1,128 @@
+/* Copyright 2021 QMK
+ *
+ * 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 3 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "bootloader.h"
+
+#include <avr/interrupt.h>
+#include <util/delay.h>
+
+__attribute__((weak)) void bootloader_jump(void) {
+ // http://www.pjrc.com/teensy/jump_to_bootloader.html
+
+ cli();
+ // disable watchdog, if enabled (it's not)
+ // disable all peripherals
+ // a shutdown call might make sense here
+ UDCON = 1;
+ USBCON = (1 << FRZCLK); // disable USB
+ UCSR1B = 0;
+ _delay_ms(5);
+
+#if defined(__AVR_AT90USB162__) // Teensy 1.0
+ EIMSK = 0;
+ PCICR = 0;
+ SPCR = 0;
+ ACSR = 0;
+ EECR = 0;
+ TIMSK0 = 0;
+ TIMSK1 = 0;
+ UCSR1B = 0;
+ DDRB = 0;
+ DDRC = 0;
+ DDRD = 0;
+ PORTB = 0;
+ PORTC = 0;
+ PORTD = 0;
+ asm volatile("jmp 0x3E00");
+#elif defined(__AVR_ATmega32U4__) // Teensy 2.0
+ EIMSK = 0;
+ PCICR = 0;
+ SPCR = 0;
+ ACSR = 0;
+ EECR = 0;
+ ADCSRA = 0;
+ TIMSK0 = 0;
+ TIMSK1 = 0;
+ TIMSK3 = 0;
+ TIMSK4 = 0;
+ UCSR1B = 0;
+ TWCR = 0;
+ DDRB = 0;
+ DDRC = 0;
+ DDRD = 0;
+ DDRE = 0;
+ DDRF = 0;
+ TWCR = 0;
+ PORTB = 0;
+ PORTC = 0;
+ PORTD = 0;
+ PORTE = 0;
+ PORTF = 0;
+ asm volatile("jmp 0x7E00");
+#elif defined(__AVR_AT90USB646__) // Teensy++ 1.0
+ EIMSK = 0;
+ PCICR = 0;
+ SPCR = 0;
+ ACSR = 0;
+ EECR = 0;
+ ADCSRA = 0;
+ TIMSK0 = 0;
+ TIMSK1 = 0;
+ TIMSK2 = 0;
+ TIMSK3 = 0;
+ UCSR1B = 0;
+ TWCR = 0;
+ DDRA = 0;
+ DDRB = 0;
+ DDRC = 0;
+ DDRD = 0;