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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/interrupt.h>
#include <avr/pgmspace.h> #include <avr/pgmspace.h>
#include "dev/usb/usb_drv.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 /* Not all AVR toolchains alias MCUSR to the older MSUSCR name */
//#if defined (__AVR_ATmega8__) || defined (__AVR_ATmega8515__) || defined (__AVR_ATmega16__)
#if !defined (MCUSR) && defined (MCUCSR) #if !defined (MCUSR) && defined (MCUCSR)
#warning *** MCUSR not defined, using MCUCSR instead *** #warning *** MCUSR not defined, using MCUCSR instead ***
#define MCUSR MCUCSR #define MCUSR MCUCSR
#endif #endif
#ifndef EEPROM_MAGIC_BYTE_ADDR
#define EEPROM_MAGIC_BYTE_ADDR (uint8_t*)(E2END-3)
#endif
volatile uint32_t Boot_Key ATTR_NO_INIT; volatile uint32_t Boot_Key ATTR_NO_INIT;
extern void Bootloader_Jump_Check(void) ATTR_INIT_SECTION(3);
bool bool
bootloader_is_present(void) { bootloader_is_present(void)
#if defined(RAMPZ) {
return pgm_read_word_far(BOOTLOADER_START_ADDRESS)!=0xFFFF; #if defined(BOOTLOADER_START_ADDRESS)
return pgm_read_word_far(BOOTLOADER_START_ADDRESS) != 0xFFFF;
#else #else
/* Probably can just return false when < 64K flash */ return false;
// return pgm_read_word_near(BOOTLOADER_START_ADDRESS)!=0xFFFF;
return false;
#endif #endif
} }
void void
Jump_To_Bootloader(void) Jump_To_Bootloader(void)
{ {
uint8_t i; /* Disable all interrupts */
cli();
#ifdef UDCON #ifdef UDCON
// If USB is used, detach from the bus /* If USB is used, detach from the bus */
Usb_detach(); 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 #endif
// Disable all interrupts /* Set the bootloader key to the magic value and force a reset */
cli(); Boot_Key = MAGIC_BOOT_KEY;
// Set the bootloader key to the magic value and force a reset eeprom_write_byte(EEPROM_MAGIC_BYTE_ADDR, 0xFF);
Boot_Key = MAGIC_BOOT_KEY;
// Wait two seconds for the USB detachment to register on the host /* Enable interrupts */
for (i = 0; i < 128; i++) sei();
_delay_ms(16);
// Set the bootloader key to the magic value and force a reset watchdog_reboot();
Boot_Key = MAGIC_BOOT_KEY;
watchdog_reboot();
} }
extern void Bootloader_Jump_Check(void) ATTR_INIT_SECTION(3);
void void
Bootloader_Jump_Check(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 the reset source was the bootloader and the key is correct,
if(MCUSR & (1<<WDRF)) { * clear it and jump to the bootloader
MCUSR = 0; */
if(Boot_Key == MAGIC_BOOT_KEY) { if(MCUSR & (1 << WDRF)) {
Boot_Key = 0; MCUSR = 0;
wdt_disable(); if(Boot_Key == MAGIC_BOOT_KEY) {
Boot_Key = 0;
((void (*)(void))BOOTLOADER_START_ADDRESS)(); wdt_disable();
} else {
Boot_Key++; /* Disable all interrupts */
} cli();
} else {
Boot_Key = MAGIC_BOOT_KEY-4; 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_CORE=contiki-raven-main
CONTIKI_TARGET_MAIN = ${CONTIKI_CORE}.o CONTIKI_TARGET_MAIN = ${CONTIKI_CORE}.o
BOOTLOADER_START = 0x1F000
#USB Ethernet Interface + USB Serial Port TX Only #USB Ethernet Interface + USB Serial Port TX Only
USB = uart_usb_lib.c \ USB = uart_usb_lib.c \
cdc_task.c \ cdc_task.c \