#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>
#endif
-/* Boot Section Size in *BYTEs*
- * Teensy halfKay 512
- * Teensy++ halfKay 1024
- * Atmel DFU loader 4096
- * LUFA bootloader 4096
- * USBaspLoader 2048
+/* 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 +---------------+
*/
#ifndef BOOTLOADER_SIZE
#warning To use bootloader_jump() you need to define BOOTLOADER_SIZE in config.h.
#define BOOTLOADER_START (FLASH_SIZE - BOOTLOADER_SIZE)
-/*
- * Entering the Bootloader via Software
+/*
+ * Entering the Bootloader via Software
* http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
*/
#define BOOTLOADER_RESET_KEY 0xB007B007
/* initialize MCU status by watchdog reset */
void bootloader_jump(void) {
-#ifdef PROTOCOL_LUFA
- USB_Disable();
- cli();
- _delay_ms(2000);
-#endif
+ #ifndef CATERINA_BOOTLOADER
-#ifdef PROTOCOL_PJRC
- cli();
- UDCON = 1;
- USBCON = (1<<FRZCLK);
- UCSR1B = 0;
- _delay_ms(5);
-#endif
+ #ifdef PROTOCOL_LUFA
+ USB_Disable();
+ cli();
+ _delay_ms(2000);
+ #endif
+
+ #ifdef PROTOCOL_PJRC
+ cli();
+ UDCON = 1;
+ USBCON = (1<<FRZCLK);
+ UCSR1B = 0;
+ _delay_ms(5);
+ #endif
+
+ #ifdef BOOTLOADHID_BOOTLOADER
+ // 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 (;;);
+
+ #else
+ // this block may be optional
+ // TODO: figure it out
+
+ uint16_t *const bootKeyPtr = (uint16_t *)0x0800;
- // watchdog reset
- reset_key = BOOTLOADER_RESET_KEY;
- wdt_enable(WDTO_250MS);
- for (;;);
+ // 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
+
+ #endif
}
+#ifdef __AVR_ATmega32A__
+// MCUSR is actually called MCUCSR in ATmega32A
+#define MCUSR MCUCSR
+#endif
/* this runs before main() */
void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3")));
#if 0
/* Jumping To The Bootloader
* http://www.pjrc.com/teensy/jump_to_bootloader.html
- *
+ *
* This method doen't work when using LUFA. idk why.
* - needs to initialize more regisers or interrupt setting?
*/