From 4d64fd8faa8b1a0ceb9019446ba6915aaf1812ea Mon Sep 17 00:00:00 2001
From: tmk <nobody@nowhere>
Date: Sat, 9 Mar 2013 11:22:27 +0900
Subject: Add bootmagic.c and fix bootloader_jump

---
 common/bootloader.c | 100 ++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 77 insertions(+), 23 deletions(-)

(limited to 'common/bootloader.c')

diff --git a/common/bootloader.c b/common/bootloader.c
index 6e04efbbda..77fa1b30a7 100644
--- a/common/bootloader.c
+++ b/common/bootloader.c
@@ -1,15 +1,16 @@
+#include <stdint.h>
+#include <stdbool.h>
 #include <avr/io.h>
 #include <avr/interrupt.h>
+#include <avr/wdt.h>
 #include <util/delay.h>
 #include "bootloader.h"
 
-/* Start Bootloader from Application
- * See 
- * http://www.pjrc.com/teensy/jump_to_bootloader.html
- * http://www.fourwalledcubicle.com/files/LUFA/Doc/120219/html/_page__software_bootloader_start.html
- */
+#ifdef PROTOCOL_LUFA
+#include <LUFA/Drivers/USB/USB.h>
+#endif
+
 
-// TODO: support usbasp
 /* Boot Section Size in bytes
  * Teensy halfKay   512
  * Atmel DFU loader 4096
@@ -18,28 +19,82 @@
 #ifndef BOOT_SIZE
 #define BOOT_SIZE 512
 #endif
-
 #define FLASH_SIZE          (FLASHEND + 1)
-#define BOOTLOADER_START    (FLASHEND - BOOT_SIZE)
+#define BOOTLOADER_START    (FLASH_SIZE - BOOT_SIZE)
 
+
+/* 
+ * 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")));
+
+/* initialize MCU status by watchdog reset */
 void bootloader_jump(void) {
+#ifdef PROTOCOL_LUFA
+    USB_Disable();
     cli();
+    _delay_ms(2000);
+#endif
 
-    //
-    //Teensy
-    //
-#if defined(__AVR_AT90USB162__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__)
-    // disable watchdog, if enabled
-    // disable all peripherals
+#ifdef PROTOCOL_PJRC
+    cli();
     UDCON = 1;
-    USBCON = (1<<FRZCLK);  // disable USB
+    USBCON = (1<<FRZCLK);
     UCSR1B = 0;
     _delay_ms(5);
-#else
-    // This makes custom USBasploader come up.
-    MCUSR = 0;
 #endif
 
+    // 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) {
+
+        #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
+        // This makes custom USBasploader come up.
+        MCUSR = 0;
+        #endif
+
+        reset_key = 0;
+        ((void (*)(void))BOOTLOADER_START)();
+    }
+}
+
+
+#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?
+ */
+void bootloader_jump(void) {
+#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
+
+    /*
+     * Initialize
+     */
 #if defined(__AVR_AT90USB162__)
     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
     TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
@@ -62,10 +117,9 @@ void bootloader_jump(void) {
     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
 #endif
 
-
-    //
-    //USBasp
-    //
+    /*
+     * USBaspLoader
+     */
 #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
     // This makes custom USBasploader come up.
     MCUSR = 0;
@@ -81,7 +135,7 @@ void bootloader_jump(void) {
     ADCSRA = 0; TWCR = 0; UCSR0B = 0;
 #endif
 
-
     // start Bootloader
     ((void (*)(void))BOOTLOADER_START)();
 }
+#endif     
-- 
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