qi-hardware/antorcha
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RESET protocol to jump from application to boot loader without power cycling

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This commit is contained in:
Werner Almesberger
2012-06-18 20:31:20 -03:00
parent 683056bca7
commit cc4b5607c7
8 changed files with 42 additions and 15 deletions
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8
fw/Makefile
View File

@@ -30,7 +30,7 @@ OBJCOPY = $(AVR_PREFIX)objcopy
#OBJDUMP = $(AVR_PREFIX)objdump
SIZE = $(AVR_PREFIX)size
OBJS = $(NAME).o dispatch.o hash.o $(COMMON_OBJS)
OBJS = $(NAME).o dispatch.o hash.o reset.o $(COMMON_OBJS)
BOOT_OBJS = boot.o flash.o fw.o $(COMMON_OBJS)
COMMON_OBJS = rf.o spi.o
@@ -87,7 +87,7 @@ clean:
rm -f version.c version.d version.o
nosecrets:
rm -f unlock-secret.inc image-secret.inc
rm -f unlock-secret.inc reset-secret.inc image-secret.inc
# ----- Build version ---------------------------------------------------------
@@ -129,10 +129,14 @@ SECRET = { dd if=$(RANDOM) iflag=fullblock bs=$(1) count=1 status=noxfer | \
unlock-secret.inc:
$(BUILD) $(call SECRET,64) >$@ || { rm -f $@; exit 1; }
reset-secret.inc:
$(BUILD) $(call SECRET,64) >$@ || { rm -f $@; exit 1; }
image-secret.inc:
$(BUILD) $(call SECRET,128) >$@ || { rm -f $@; exit 1; }
fw.o: unlock-secret.inc
reset.o: unlock-secret.inc
# ----- Dependencies ----------------------------------------------------------

8
fw/antorcha.c
View File

@@ -23,8 +23,8 @@
#include "dispatch.h"
static const struct handler *protos[] = {
&reset_handler,
NULL
};
@@ -39,12 +39,6 @@ int main(void)
* It has also brought up RF and the underlying SPI.
*/
while (1) {
SET(LED_B8);
_delay_ms(100);
CLR(LED_B8);
_delay_ms(100);
}
while (1) {
got = rf_recv(buf, sizeof(buf));
if (got > 2)

12
fw/boot.c
View File

@@ -57,9 +57,19 @@ int main(void)
PORTD = 0;
DDRD = 0xff;
/* disable pull-ups */
/* Disable pull-ups */
MCUCR |= 1 << PUD;
/*
* Disable the watchdog timer, in case the boot loader has been
* entered by a watchdog reset commanded by the application.
*/
MCUSR = 0; /* Remove override */
WDTCSR |= 1 << WDCE; /* Enable change */
WDTCSR = 1 << WDCE; /* Disable watchdog while still enabling
change */
rf_init();
/*

2
fw/dispatch.h
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@@ -26,6 +26,8 @@ struct handler {
};
extern struct handler reset_handler;
bool dispatch(const uint8_t *buf, uint8_t len, const struct handler **protos);
#endif /* !PROTO_H */

6
fw/fw.c
View File

@@ -15,6 +15,9 @@
#include <stdint.h>
#include <string.h>
#define F_CPU 8000000UL
#include <util/delay.h>
#include "io.h"
#include "flash.h"
#include "proto.h"
@@ -54,8 +57,9 @@ bool fw_packet(const uint8_t *buf, uint8_t len)
static uint8_t limit;
uint8_t ack[] = { FIRMWARE+1, buf[1], buf[2] };
/* short (barely visible) flash to indicate reception */
/* short flash to indicate reception */
SET(LED_B7);
_delay_ms(1);
CLR(LED_B7);
/* Check packet for formal validity */

1
fw/proto.h
View File

@@ -18,6 +18,7 @@
enum pck_type {
PING = 0, /* version query */
PONG = 1, /* version response */
RESET = 2, /* reset to boot loader */
FIRMWARE = 4, /* firmware upload */
FIRMWARE_ACK = 5, /* firmware upload acknowledgement */
IMAGE = 6, /* image upload */