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avr/bootloader.c: Now compatible with bootloaders which always run first.

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The boot loader now knows when to go into bootstrap mode by
looking for a specific EEPROM value. Also updated code style
to match Contiki code style guidelines.
This commit is contained in:
Robert Quattlebaum 2012-05-17 08:48:41 -07:00
parent 5df586e09d
commit 9c17a542a7
2 changed files with 71 additions and 39 deletions
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108
cpu/avr/bootloader.c
View file

@ -5,69 +5,99 @@
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include "dev/usb/usb_drv.h"
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <avr/eeprom.h>
//Not all AVR toolchains alias MCUSR to the older MSUSCR name
//#if defined (__AVR_ATmega8__) || defined (__AVR_ATmega8515__) || defined (__AVR_ATmega16__)
/* Not all AVR toolchains alias MCUSR to the older MSUSCR name */
#if !defined (MCUSR) && defined (MCUCSR)
#warning *** MCUSR not defined, using MCUCSR instead ***
#define MCUSR MCUCSR
#endif
#ifndef EEPROM_MAGIC_BYTE_ADDR
#define EEPROM_MAGIC_BYTE_ADDR (uint8_t*)(E2END-3)
#endif
volatile uint32_t Boot_Key ATTR_NO_INIT;
extern void Bootloader_Jump_Check(void) ATTR_INIT_SECTION(3);
bool
bootloader_is_present(void) {
#if defined(RAMPZ)
return pgm_read_word_far(BOOTLOADER_START_ADDRESS)!=0xFFFF;
bootloader_is_present(void)
{
#if defined(BOOTLOADER_START_ADDRESS)
return pgm_read_word_far(BOOTLOADER_START_ADDRESS) != 0xFFFF;
#else
/* Probably can just return false when < 64K flash */
// return pgm_read_word_near(BOOTLOADER_START_ADDRESS)!=0xFFFF;
return false;
return false;
#endif
}
void
Jump_To_Bootloader(void)
{
uint8_t i;
/* Disable all interrupts */
cli();
#ifdef UDCON
// If USB is used, detach from the bus
Usb_detach();
/* If USB is used, detach from the bus */
Usb_detach();
uint8_t i;
/* Wait two seconds for the USB detachment to register on the host */
for(i = 0; i < 200; i++) {
_delay_ms(10);
watchdog_periodic();
}
#endif
// Disable all interrupts
cli();
/* Set the bootloader key to the magic value and force a reset */
Boot_Key = MAGIC_BOOT_KEY;
// Set the bootloader key to the magic value and force a reset
Boot_Key = MAGIC_BOOT_KEY;
eeprom_write_byte(EEPROM_MAGIC_BYTE_ADDR, 0xFF);
// Wait two seconds for the USB detachment to register on the host
for (i = 0; i < 128; i++)
_delay_ms(16);
/* Enable interrupts */
sei();
// Set the bootloader key to the magic value and force a reset
Boot_Key = MAGIC_BOOT_KEY;
watchdog_reboot();
watchdog_reboot();
}
extern void Bootloader_Jump_Check(void) ATTR_INIT_SECTION(3);
void
Bootloader_Jump_Check(void)
{
// If the reset source was the bootloader and the key is correct, clear it and jump to the bootloader
if(MCUSR & (1<<WDRF)) {
MCUSR = 0;
if(Boot_Key == MAGIC_BOOT_KEY) {
Boot_Key = 0;
wdt_disable();
((void (*)(void))BOOTLOADER_START_ADDRESS)();
} else {
Boot_Key++;
}
} else {
Boot_Key = MAGIC_BOOT_KEY-4;
}
/* If the reset source was the bootloader and the key is correct,
* clear it and jump to the bootloader
*/
if(MCUSR & (1 << WDRF)) {
MCUSR = 0;
if(Boot_Key == MAGIC_BOOT_KEY) {
Boot_Key = 0;
wdt_disable();
/* Disable all interrupts */
cli();
eeprom_write_byte(EEPROM_MAGIC_BYTE_ADDR, 0xFF);
/* Enable interrupts */
sei();
((void (*)(void))(BOOTLOADER_START_ADDRESS)) ();
} else {
/* The watchdog fired. Probably means we
* crashed. Wait two seconds before continuing.
*/
Boot_Key++;
uint8_t i;
for(i = 0; i < 200; i++) {
_delay_ms(10);
watchdog_periodic();
}
}
} else {
Boot_Key = MAGIC_BOOT_KEY - 4;
}
}

2
platform/avr-ravenusb/Makefile.avr-ravenusb
View file

@ -2,6 +2,8 @@ CONTIKI_TARGET_DIRS = . apps net loader dev/usb dev/serial
CONTIKI_CORE=contiki-raven-main
CONTIKI_TARGET_MAIN = ${CONTIKI_CORE}.o
BOOTLOADER_START = 0x1F000
#USB Ethernet Interface + USB Serial Port TX Only
USB = uart_usb_lib.c \
cdc_task.c \