From 9fdc27626097ae03b767a09427efc90475d90955 Mon Sep 17 00:00:00 2001
From: Jack Humbert <jack.humb@gmail.com>
Date: Mon, 27 Nov 2017 23:08:21 -0500
Subject: Updates bootloader settings, adds file size check (#2029)

* pull fuse settings for bootloader jump

* fix 32a chips

* make automatic bootloader selection optional

* quantify bootloaders

* fixs #164, speeds up dfu reset

* fix for chips w/o usb

* missing an n

* fix bootloader sizes, use words for addresses

* fix bmini, pearl, and [[ issue, make things quiet

* ignore avr errors on arm for now

* update settings for the light

* document bootloader stuff

* add bootloader title
---
 tmk_core/common/avr/bootloader.c | 196 +++++++++++++++++++++------------------
 1 file changed, 105 insertions(+), 91 deletions(-)

(limited to 'tmk_core/common/avr/bootloader.c')

diff --git a/tmk_core/common/avr/bootloader.c b/tmk_core/common/avr/bootloader.c
index 34db8d0b0a..ee150817c3 100644
--- a/tmk_core/common/avr/bootloader.c
+++ b/tmk_core/common/avr/bootloader.c
@@ -6,6 +6,7 @@
 #include <avr/wdt.h>
 #include <util/delay.h>
 #include "bootloader.h"
+#include <avr/boot.h>
 
 #ifdef PROTOCOL_LUFA
 #include <LUFA/Drivers/USB/USB.h>
@@ -56,14 +57,17 @@
  *          |  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_SIZE     4096
-#endif
 
-#define FLASH_SIZE          (FLASHEND + 1L)
-#define BOOTLOADER_START    (FLASH_SIZE - BOOTLOADER_SIZE)
+#define FLASH_SIZE (FLASHEND + 1L)
+
+#if !defined(BOOTLOADER_SIZE)
+    uint16_t bootloader_start;
+#endif
 
+#define BOOT_SIZE_256  0b110
+#define BOOT_SIZE_512  0b100
+#define BOOT_SIZE_1024 0b010
+#define BOOT_SIZE_2048 0b000
 
 /*
  * Entering the Bootloader via Software
@@ -74,34 +78,62 @@ uint32_t reset_key  __attribute__ ((section (".noinit")));
 
 /* initialize MCU status by watchdog reset */
 void bootloader_jump(void) {
-    #ifndef CATERINA_BOOTLOADER
-
-        #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 (;;);
+    #if !defined(BOOTLOADER_SIZE)
+        uint8_t high_fuse = boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS);
+
+        if (high_fuse & BOOT_SIZE_256) { 
+            bootloader_start = (FLASH_SIZE - 512) >> 1;
+        } else if (high_fuse & BOOT_SIZE_512) {
+            bootloader_start = (FLASH_SIZE - 1024) >> 1;
+        } else if (high_fuse & BOOT_SIZE_1024) {
+            bootloader_start = (FLASH_SIZE - 2048) >> 1;
+        } else {
+            bootloader_start = (FLASH_SIZE - 4096) >> 1;
+        }
+    #endif
 
-    #else
+    // 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
 
@@ -118,83 +150,65 @@ void bootloader_jump(void) {
 
         while(1) {} // wait for watchdog timer to trigger
 
+    #else // Assume remaining boards are DFU, even if the flag isn't set
+
+        #ifndef __AVR_ATmega32A__ // 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
+
 }
 
 #ifdef __AVR_ATmega32A__
-// MCUSR is actually called MCUCSR in ATmega32A
-#define MCUSR MCUCSR
+    // 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")));
 void bootloader_jump_after_watchdog_reset(void)
 {
-    if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
-        reset_key = 0;
+    #ifndef BOOTLOADER_HALFKAY
+        if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
+            reset_key = 0;
+
+            // My custom USBasploader requires this to come up.
+            MCUSR = 0;
 
-        // My custom USBasploader requires this to come up.
-        MCUSR = 0;
+            // Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog.
+            MCUSR &= ~(1<<WDRF);
+            wdt_disable();
 
-        // Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog.
-        MCUSR &= ~(1<<WDRF);
-        wdt_disable();
 
-        // This is compled into 'icall', address should be in word unit, not byte.
-        ((void (*)(void))(BOOTLOADER_START/2))();
-    }
+            // 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
 }
 
 
 #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;
-    DDRB = 0; DDRC = 0; DDRD = 0;
-    PORTB = 0; PORTC = 0; PORTD = 0;
-#elif defined(__AVR_ATmega32U4__)
-    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;
-#elif defined(__AVR_AT90USB646__)
-    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;
-#elif defined(__AVR_AT90USB1286__)
-    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;
-#endif
-
     /*
-     * USBaspLoader
+     * USBaspLoader - I'm not sure if this is used at all in any projects
+     *                would love to support it if it is -Jack
      */
 #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
     // This makes custom USBasploader come up.
-- 
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