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RESET protocol to jump from application to boot loader without power cycling
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683056bca7
commit
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2
PROTOCOL
2
PROTOCOL
@ -7,6 +7,8 @@ Protocol
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1 0 0 Pong (maybe return version string in the future)
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2 0 0 Reset (64 bytes reset secret)
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4 0 N Unlock secret (64 bytes payload)
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4 1..N-1 N Firmware binary (64 bytes payload)
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4 N N First half of hash
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@ -30,7 +30,7 @@ OBJCOPY = $(AVR_PREFIX)objcopy
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#OBJDUMP = $(AVR_PREFIX)objdump
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SIZE = $(AVR_PREFIX)size
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OBJS = $(NAME).o dispatch.o hash.o $(COMMON_OBJS)
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OBJS = $(NAME).o dispatch.o hash.o reset.o $(COMMON_OBJS)
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BOOT_OBJS = boot.o flash.o fw.o $(COMMON_OBJS)
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COMMON_OBJS = rf.o spi.o
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@ -87,7 +87,7 @@ clean:
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rm -f version.c version.d version.o
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nosecrets:
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rm -f unlock-secret.inc image-secret.inc
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rm -f unlock-secret.inc reset-secret.inc image-secret.inc
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# ----- Build version ---------------------------------------------------------
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@ -129,10 +129,14 @@ SECRET = { dd if=$(RANDOM) iflag=fullblock bs=$(1) count=1 status=noxfer | \
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unlock-secret.inc:
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$(BUILD) $(call SECRET,64) >$@ || { rm -f $@; exit 1; }
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reset-secret.inc:
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$(BUILD) $(call SECRET,64) >$@ || { rm -f $@; exit 1; }
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image-secret.inc:
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$(BUILD) $(call SECRET,128) >$@ || { rm -f $@; exit 1; }
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fw.o: unlock-secret.inc
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reset.o: unlock-secret.inc
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# ----- Dependencies ----------------------------------------------------------
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@ -23,8 +23,8 @@
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#include "dispatch.h"
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static const struct handler *protos[] = {
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&reset_handler,
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NULL
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};
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@ -39,12 +39,6 @@ int main(void)
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* It has also brought up RF and the underlying SPI.
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*/
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while (1) {
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SET(LED_B8);
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_delay_ms(100);
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CLR(LED_B8);
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_delay_ms(100);
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}
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while (1) {
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got = rf_recv(buf, sizeof(buf));
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if (got > 2)
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12
fw/boot.c
12
fw/boot.c
@ -57,9 +57,19 @@ int main(void)
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PORTD = 0;
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DDRD = 0xff;
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/* disable pull-ups */
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/* Disable pull-ups */
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MCUCR |= 1 << PUD;
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/*
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* Disable the watchdog timer, in case the boot loader has been
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* entered by a watchdog reset commanded by the application.
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*/
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MCUSR = 0; /* Remove override */
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WDTCSR |= 1 << WDCE; /* Enable change */
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WDTCSR = 1 << WDCE; /* Disable watchdog while still enabling
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change */
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rf_init();
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/*
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@ -26,6 +26,8 @@ struct handler {
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};
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extern struct handler reset_handler;
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bool dispatch(const uint8_t *buf, uint8_t len, const struct handler **protos);
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#endif /* !PROTO_H */
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6
fw/fw.c
6
fw/fw.c
@ -15,6 +15,9 @@
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#include <stdint.h>
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#include <string.h>
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#define F_CPU 8000000UL
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#include <util/delay.h>
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#include "io.h"
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#include "flash.h"
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#include "proto.h"
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@ -54,8 +57,9 @@ bool fw_packet(const uint8_t *buf, uint8_t len)
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static uint8_t limit;
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uint8_t ack[] = { FIRMWARE+1, buf[1], buf[2] };
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/* short (barely visible) flash to indicate reception */
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/* short flash to indicate reception */
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SET(LED_B7);
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_delay_ms(1);
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CLR(LED_B7);
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/* Check packet for formal validity */
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@ -18,6 +18,7 @@
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enum pck_type {
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PING = 0, /* version query */
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PONG = 1, /* version response */
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RESET = 2, /* reset to boot loader */
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FIRMWARE = 4, /* firmware upload */
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FIRMWARE_ACK = 5, /* firmware upload acknowledgement */
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IMAGE = 6, /* image upload */
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@ -49,6 +49,7 @@ static void rf_send(struct atrf_dsc *dsc, void *buf, int len)
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/* Copy the message to append the CRC placeholders */
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memcpy(tmp, buf, len);
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atrf_reg_write(dsc, REG_TRX_STATE, TRX_CMD_PLL_ON);
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flush_interrupts(dsc);
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atrf_buf_write(dsc, tmp, len+2);
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atrf_reg_write(dsc, REG_TRX_STATE, TRX_CMD_TX_START);
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wait_for_interrupt(dsc, IRQ_TRX_END,
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@ -98,17 +99,25 @@ static void ping(struct atrf_dsc *dsc)
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}
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static void packet(struct atrf_dsc *dsc,
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static void packet_noack(struct atrf_dsc *dsc,
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uint8_t type, uint8_t seq, uint8_t last, const void *payload, int len)
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{
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uint8_t tx_buf[PAYLOAD+3] = { type, seq, last };
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uint8_t rx_buf[10];
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int got;
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assert(len == PAYLOAD);
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memcpy(tx_buf+3, payload, len);
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while (1) {
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rf_send(dsc, tx_buf, sizeof(tx_buf));
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}
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static void packet(struct atrf_dsc *dsc,
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uint8_t type, uint8_t seq, uint8_t last, const void *payload, int len)
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{
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uint8_t rx_buf[10];
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int got;
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while (1) {
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packet_noack(dsc, type, seq, last, payload, len);
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if (verbose)
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write(2, ">", 1);
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got = rf_recv(dsc, rx_buf, sizeof(rx_buf));
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@ -146,6 +155,7 @@ static void send_firmware(struct atrf_dsc *dsc, void *buf, int len)
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write(2, "firmware ", 9);
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last = (len+63)/64;
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seq = 0;
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packet_noack(dsc, RESET, 0, 0, unlock_secret, PAYLOAD);
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packet(dsc, FIRMWARE, seq++, last, unlock_secret, PAYLOAD);
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while (len >= PAYLOAD) {
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packet(dsc, FIRMWARE, seq++, last, buf, PAYLOAD);
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