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Riot-OS fw-update example running on Atmel SAM-R21

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Daniele Lacamera 2019-01-27 14:46:01 +01:00
parent 41dd57d557
commit bde9b2c31b
18 changed files with 1347 additions and 1 deletions
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.gitmodules vendored
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[submodule "contiki-nrf52/contiki"]
path = contiki-nrf52/contiki
url = https://github.com/danielinux/contiki
[submodule "riotOS-samr21/RIOT"]
path = riotOS-samr21/RIOT
url = https://github.com/danielinux/RIOT

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riotOS-samr21/Makefile 100644
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all:
make wolfboot -C fw-update
flash:
make wolfboot-flash -C fw-update
clean:
make clean -C fw-update

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riotOS-samr21/README.md 100644
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# fw-update
Firmware update example on RIOT-OS, using serial console to transfer the update
This project is meant to demonstrate a firmware upgrade mechanism based on [wolfBoot secure bootloader](https://github.com/wolfssl/wolfBoot), powered by wolfSSL.
The bootloader expect the application to transfer the new firmware, store it in the update partition on the flash memory and trigger an upgrade on the next reboot.
The application in this example uses USB CDC-ACM to download a new firmware image from the host machine. Once the transfer is complete, the target is rebooted into
the bootloader, which validates the new image and copies it to the active boot partition.
## Components
- Bootloader: [wolfBoot](https://github.com/wolfssl/wolfBoot) by wolfSSL
- OS: [RIOT-OS](https://riot-os.org/)
- Application: Custom firmware update RIOT-os application that downloads the update through USB CDC-ACM
## Preparing the initial firmware
The flash memory on the samR21 is divided as follows:
```
- 0x000000 - 0x007fff : Bootloader partition for wolfBoot
- 0x008000 - 0x022fff : Active (boot) partition
- 0x023000 - 0x03efff : Upgrade partition
- 0x03e000 - 0x03e0ff : Swap sector
```
Running `make` assembles the following images:
- wolfBoot compiled to run on SamR21
- RIOT-OS with automatic start-up of the firmware update process, in a signed image that can be verified by wolfBoot during start-up
Running `make wolfboot-flash` will upload the two components into the respective partitions onto the target.
More information about wolfBoot upgrade mechanism can be found in the [wolfBoot](https://github.com/wolfSSL/wolfBoot) repository.
## Firmware update
The directory [fw-update-server](fw-update-server) contains a small exaple DTLS v1.2 server that can be used to transfer a (signed) image to any client requesting a firmware upgrade.
To compile fw-update-server for the host system, simply run `make` within the directory.
To run the fw-update-server, simply run `./server` followed by the path of the signed firmware to transfer. The firmware previously compiled and signed with `make` can be found in `fw-update/bin/samr21-xpro/fw-update.bin.v5.signed`.
When launched, the server transmits the size of the firmware, and then the flash area content in chunks of 16B each.
When the transfer is complete, a flag is activated at the end of the flash area to notify wolfBoot of a pending upgrade (using `wolfBoot_update_trigger()`)
After reboot, wolfBoot will copy the image from the secondary partition to the primary partition, to allow the new firmware to run, but only if the new firmware can be authenticated using the public Ed25519 key stored in the bootloader image. In all other cases, the upgrade is canceled and the old firmware can be started again.
## Copyright notice
fw-update-server example is Copyright (c) 2018 wolfSSL Inc., and distributed under the term of GNU GPL2.
fw-update embedded application for RIOT-os is Copyright (c) 2018 wolfSSL Inc., and distributed under the term of GNU GPL2.
wolfBoot, wolfSSL (formerly known as CyaSSL) and wolfCrypt are Copyright (c) 2006-2018 wolfSSL Inc., and licensed for use under GPLv2.
RIOT-OS is distributed under the term of GNU LGPL v2.1.
See the documentation within each component subdirectory for more information about using and distributing this software.

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riotOS-samr21/RIOT 160000

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Subproject commit 62f7888cbd362f2500bd998d0e2ec48fc4244195

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riotOS-samr21/fw-update-server/LICENSE 100644
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riotOS-samr21/fw-update-server/Makefile 100644
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CC=gcc
CFLAGS=-Wall -DWOLFSSL_DTLS -DWOLFSSL_DEBUG -DTFM_TIMING_RESISTANT -g -ggdb
EXE=server
LIBS=-lwolfssl -lpthread
$(EXE): $(EXE).o
$(CC) -o $@ $^ $(CFLAGS) $(LIBS)
clean:
rm -f *.o $(EXE)

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riotOS-samr21/fw-update-server/server.c 100644
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/* usb-server.c
*
* Copyright (C) 2006-2019 wolfSSL Inc.
*
* This file is part of wolfSSL. (formerly known as CyaSSL)
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*
*=============================================================================
*
* OTA Upgrade mechanism implemented using DTLS 1.2
*
*/
#define _XOPEN_SOURCE 600
#include <stdio.h> /* standard in/out procedures */
#include <stdlib.h> /* defines system calls */
#include <string.h> /* necessary for memset */
#include <netdb.h>
#include <sys/socket.h> /* used for all socket calls */
#include <netinet/in.h> /* used for sockaddr_in6 */
#include <arpa/inet.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <termios.h>
#include <signal.h>
#include <errno.h>
#define MSGLEN (4 + 4 + 8)
#define PORT "/dev/ttyACM0"
static volatile int cleanup; /* To handle shutdown */
union usb_ack {
uint32_t offset;
uint8_t u8[4];
};
static uint8_t pktbuf[MSGLEN];
static unsigned int pktbuf_size = 0;
static int serialfd = -1;
static uint32_t high_ack;
void alarm_handler(int signo)
{
if (serialfd >= 0 && pktbuf_size > 0) {
write(serialfd, pktbuf, pktbuf_size);
printf("retransmitting...\n");
}
}
static int recv_ack(union usb_ack *ack)
{
unsigned char c;
int res;
int err = 0;
while (1) {
res = read(serialfd, &c, 1);
if (res <= 0) {
continue;
}
if (c == '#') {
int i = 0;
err = 0;
ack->offset = 0;
while (i < 4) {
res = read(serialfd, &c, 1);
if (res < 1) {
usleep(10000);
continue;
}
ack->u8[i++] = c;
}
return 0;
}
if (c == '!') {
if (++err > 3) {
return -1;
}
}
}
}
static void check(uint8_t *pkt)
{
uint16_t *c = (uint16_t *)(pkt + 2);
int i;
uint16_t *p = (uint16_t *)(pkt + 4);
*c = 0;
pkt[0] = 0xA5;
pkt[1] = 0x5A;
for (i = 0; i < 6; i++)
*c += p[i];
}
int main(int argc, char** argv)
{
/* Variables for awaiting datagram */
int res = 1;
uint32_t len, tot_len;
int ffd; /* Firmware file descriptor */
struct stat st;
union usb_ack ack;
struct termios tty;
sigset(SIGALRM, alarm_handler);
if (argc != 2) {
printf("Usage: %s firmware_filename\n", argv[0]);
exit(1);
}
ffd = open(argv[1], O_RDONLY);
if (ffd < 0) {
perror("opening file");
exit(2);
}
res = fstat(ffd, &st);
if (res != 0) {
perror("fstat file");
exit(2);
}
tot_len = st.st_size;
serialfd = open(PORT, O_RDWR | O_NOCTTY);
tcgetattr(serialfd, &tty);
cfsetospeed(&tty, B115200);
cfsetispeed(&tty, B115200);
tty.c_cflag = (tty.c_cflag & ~CSIZE) | (CS8);
tty.c_iflag &= ~(IGNBRK | IXON | IXOFF | IXANY| INLCR | ICRNL);
tty.c_oflag &= ~OPOST;
tty.c_oflag &= ~(ONLCR|OCRNL);
tty.c_cflag &= ~(PARENB | PARODD | CSTOPB);
tty.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
tty.c_iflag &= ~ISTRIP;
tty.c_cc[VMIN] = 0;
tty.c_cc[VTIME] = 5;
tcsetattr(serialfd, TCSANOW, &tty);
/* Await Start hash */
while (1) {
char c;
res = read(serialfd, &c, 1);
if (res <= 0) {
usleep(10000);
continue;
}
if (c == '#') {
break;
}
else {
printf("%c",c);
fflush(stdout);
}
}
printf("Target connected.\n");
usleep(500000);
printf("Starting update.\n");
do {
uint8_t hdr[2] = { 0xA5, 0x5A};
len = 0;
lseek(ffd, 0, SEEK_SET);
write(serialfd, &hdr, 2);
write(serialfd, &tot_len, sizeof(uint32_t));
printf("Sent image file size (%d)\n", tot_len);
while (len < tot_len) {
res = recv_ack(&ack);
if (res == 0) {
if (ack.offset > tot_len) {
printf("Ignore bogus ack...\n");
continue;
}
if (ack.offset < high_ack) {
printf("Ignore low ack...\n");
continue;
}
high_ack = ack.offset;
pktbuf_size = 0;
if (ack.offset != len) {
printf("buf rewind %u\n", ack.offset);
lseek(ffd, ack.offset, SEEK_SET);
len = ack.offset;
}
memcpy(pktbuf + 4, &len, sizeof(len));
res = read(ffd, pktbuf + 4 + sizeof(uint32_t), MSGLEN - (4 + sizeof(uint32_t)));
if (res < 0) {
printf("EOF\r\n");
cleanup = 1;
break;
}
pktbuf_size = res + 4 + sizeof(uint32_t);
check(pktbuf);
write(serialfd, pktbuf, pktbuf_size);
len += res;
printf("Sent bytes: %d/%d %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x \r", len, tot_len, pktbuf[0], pktbuf[1], pktbuf[2], pktbuf[3], pktbuf[4], pktbuf[5], pktbuf[6], pktbuf[7]);
fflush(stdout);
alarm(2);
}
}
printf("\n\n");
} while (0);
printf("waiting for last ack...\n");
while(!cleanup) {
res = recv_ack(&ack);
if ((res == 0 ) && (ack.offset == tot_len)) {
printf("Transfer complete.\n");
break;
}
}
printf("All done.\n");
close(serialfd);
return 0;
}

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riotOS-samr21/fw-update/.gdbinit 100644
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tar rem:3333
file ../../wolfBoot/wolfboot.elf
add-symbol-file bin/samr21-xpro/ota-update.elf 0x8100
foc c

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riotOS-samr21/fw-update/Makefile 100644
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# name of your application
APPLICATION = fw-update
WOLFBOOT_OFFSET=32768
WOLFBOOT_PARTITION_SIZE=110592
IMAGE_VERSION=5
# If no BOARD is found in the environment, use this default:
BOARD ?= samr21-xpro
# This has to be the absolute path to the RIOT base directory:
RIOTBASE ?= $(CURDIR)/../RIOT/
# Comment this out to disable code in RIOT that does safety checking
# which is not needed in a production environment but helps in the
# development process:
DEVELHELP ?= 1
# Change this to 0 show compiler invocation lines by default:
QUIET ?= 0
EXTERNAL_MODULE_DIRS += $(CURDIR)/libwolfboot
USEMODULE += libwolfboot
USEMODULE += gnrc_netdev_default
USEMODULE += auto_init_gnrc_netif
# Specify the mandatory networking modules for IPv6 and UDP
USEMODULE += gnrc_ipv6_default
USEMODULE += gnrc_sock_udp
USEMODULE += periph_flashpage
#USEMODULE += shell
WOLFBOOT_DIR=$(abspath $(RIOTBASE)/../../wolfBoot)
USEMODULE_INCLUDES+=-I$(WOLFBOOT_DIR)/include
include $(RIOTBASE)/Makefile.include
include ../wolfboot.mk

21
riotOS-samr21/fw-update/README.md 100644
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Hello World!
============
This is a basic example how to use RIOT in your embedded application.
It prints out the famous text `Hello World!`.
This example should foremost give you an overview how to use the Makefile system:
* First you must give your application a name, which is commonly the same as the name of the directory it resides in.
Then you can define a default BOARD for which the application was written.
By using e.g. `make BOARD=msba2` you can override the default board.
With `make buildtest` the application gets compiled for all supported boards.
* The variable `RIOTBASE` contains an absolute or relative path to the directory where you have checked out RIOT.
If your code resides in a subdirectory of RIOT, then you can use `$(CURDIR)` as it's done in here.
* The variable `QUIET`, which is either `1` or `0`, defines whether to print verbose compile information, or hide them, respectively.
* The last line of your Makefile must be `include $(RIOTBASE)/Makefile.include`.
The code itself may look like your usual *C* beginners hello-world example.

6
riotOS-samr21/fw-update/libwolfboot/Makefile 100644
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WOLFBOOT_DIR=../../../../wolfBoot
INCLUDES+=-I$(WOLFBOOT_DIR)/include
SRC+=libwolfboot.c samr21.c
NO_AUTO_SRC = 1
include $(RIOTBASE)/Makefile.base

134
riotOS-samr21/fw-update/libwolfboot/libwolfboot.c 100644
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/* libwolfboot.c
*
* Copyright (C) 2018 wolfSSL Inc.
*
* This file is part of wolfBoot.
*
* wolfBoot is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfBoot is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
#include <hal.h>
#include <stdint.h>
#include <inttypes.h>
#include <wolfboot/wolfboot.h>
static uint8_t *get_trailer(uint8_t part)
{
if (part == PART_BOOT)
return (void *)(WOLFBOOT_PARTITION_BOOT_ADDRESS + WOLFBOOT_PARTITION_SIZE);
else if (part == PART_UPDATE)
return (void *)(WOLFBOOT_PARTITION_UPDATE_ADDRESS + WOLFBOOT_PARTITION_SIZE);
else
return (void *)0;
}
int wolfBoot_set_partition_state(uint8_t part, uint8_t newst)
{
uint8_t *trailer_end = get_trailer(part);
uint32_t *magic;
uint8_t *state;
uint32_t wolfboot_magic_trail = WOLFBOOT_MAGIC_TRAIL;
if (!trailer_end)
return -1;
magic = (uint32_t *)(trailer_end - sizeof(uint32_t));
if (*magic != WOLFBOOT_MAGIC_TRAIL)
hal_flash_write((uint32_t)magic, (void *)&wolfboot_magic_trail, sizeof(uint32_t));
state = (trailer_end - sizeof(uint32_t)) - 1;
if (*state != newst)
hal_flash_write((uint32_t)state, (void *)&newst, 1);
return 0;
}
int wolfBoot_set_sector_flag(uint8_t part, uint8_t sector, uint8_t newflag)
{
uint8_t *trailer_end = get_trailer(part);
uint32_t *magic;
uint8_t *flags;
uint8_t fl_value;
uint32_t wolfboot_magic_trail = WOLFBOOT_MAGIC_TRAIL;
uint8_t pos = sector >> 1;
if (!trailer_end)
return -1;
magic = (uint32_t *)(trailer_end - sizeof(uint32_t));
if (*magic != WOLFBOOT_MAGIC_TRAIL)
hal_flash_write((uint32_t)magic, (void *)&wolfboot_magic_trail, sizeof(uint32_t));
flags = (trailer_end - sizeof(uint32_t)) - (2 + pos);
if (sector == (pos << 1))
fl_value = (*flags & 0xF0) | (newflag & 0x0F);
else
fl_value = ((newflag & 0x0F) << 4) | (*flags & 0x0F);
if (fl_value != *flags)
hal_flash_write((uint32_t)flags, &fl_value, 1);
return 0;
}
int wolfBoot_get_partition_state(uint8_t part, uint8_t *st)
{
uint8_t *trailer_end = get_trailer(part);
uint32_t *magic;
uint8_t *state;
if (!trailer_end)
return -1;
magic = (uint32_t *)(trailer_end - sizeof(uint32_t));
if (*magic != WOLFBOOT_MAGIC_TRAIL)
return -1;
state = (trailer_end - sizeof(uint32_t)) - 1;
*st = *state;
return 0;
}
int wolfBoot_get_sector_flag(uint8_t part, uint8_t sector, uint8_t *flag)
{
uint8_t *trailer_end = get_trailer(part);
uint32_t *magic;
uint8_t *flags;
uint8_t pos = sector >> 1;
if (!trailer_end)
return -1;
magic = (uint32_t *)(trailer_end - sizeof(uint32_t));
if (*magic != WOLFBOOT_MAGIC_TRAIL)
return -1;
flags = (trailer_end - sizeof(uint32_t)) - (2 + pos);
if (sector == (pos << 1))
*flag = *flags & 0x0F;
else
*flag = (*flags & 0xF0) >> 4;
return 0;
}
void wolfBoot_erase_partition(uint8_t part)
{
if (part == PART_BOOT)
hal_flash_erase(WOLFBOOT_PARTITION_BOOT_ADDRESS, WOLFBOOT_PARTITION_SIZE);
if (part == PART_UPDATE)
hal_flash_erase(WOLFBOOT_PARTITION_UPDATE_ADDRESS, WOLFBOOT_PARTITION_SIZE);
if (part == PART_SWAP)
hal_flash_erase(WOLFBOOT_PARTITION_SWAP_ADDRESS, WOLFBOOT_SECTOR_SIZE);
}
void wolfBoot_update_trigger(void)
{
uint8_t st = IMG_STATE_UPDATING;
hal_flash_unlock();
wolfBoot_set_partition_state(PART_UPDATE, st);
hal_flash_lock();
}
void wolfBoot_success(void)
{
uint8_t st = IMG_STATE_SUCCESS;
hal_flash_unlock();
wolfBoot_set_partition_state(PART_BOOT, st);
hal_flash_lock();
}

216
riotOS-samr21/fw-update/libwolfboot/samr21.c 100644
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/* samr21.c
*
* Copyright (C) 2018 wolfSSL Inc.
*
* This file is part of wolfBoot.
*
* wolfBoot is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfBoot is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
#include <stdint.h>
/* Clock settings for cpu samd21g18a @ 48MHz */
#define CPU_FREQ (48000000)
#define GCLK_CTRL_RESET (1)
#define GCLK_GENDIV_DIVSHIFT (8)
#define GCLK_CLKCTRL_GENSHIFT (8)
#define GCLK_STATUS_SYNCBUSY (1 << 7)
#define GCLK_GENCTRL_SRC_OSC8M (6 << 8)
#define GCLK_GENCTRL_EN (1 << 16)
#define GCLK_GENCTRL_SRC_FDPLL (1 << 11)
#define GCLK_CLKCTRL_GEN_CLK7 (7 << 8)
#define GCLK_CLKCTRL_CLKEN (1 << 14)
#define WAITSTATES (1)
/* Flash settings for samd21g18a */
#define FLASH_SIZE (256 * 1024)
#define FLASH_PAGESIZE 64
#define FLASH_N_PAGES 4096
#define WDT_CTRL *((volatile uint8_t *)(0x40001000))
#define WDT_EN (1 << 1)
#define APBAMASK_REG *((volatile uint32_t *)(0x40000418))
#define APBAMASK_PM_EN (1 << 1)
#define APBAMASK_SYSCTRL_EN (1 << 2)
#define APBAMASK_GCLK_EN (1 << 3)
#define APBBMASK_REG *((volatile uint32_t *)(0x4000041C))
#define APBBMASK_NVM_EN (1 << 2)
#define NVMCTRL_BASE (0x41004000)
#define NVMCTRLA_REG *((volatile uint16_t *)(NVMCTRL_BASE))
#define NVMCTRLB_REG *((volatile uint32_t *)(NVMCTRL_BASE + 4))
#define NVMCTRL_INTFLAG *((volatile uint8_t *)(NVMCTRL_BASE + 0x14))
#define NVMCTRL_ADDR *((volatile uint32_t *)(NVMCTRL_BASE + 0x1c))
#define NVMCMD_KEY (0xA500)
#define NVMCMD_ERASE (0x02)
#define NVMCMD_WP (0x04)
#define NVMCMD_PBC (0x44)
#define NVMCTRL_INTFLAG_NVMREADY (1)
#define GCLK_BASE (0x40000C00)
#define GCLK_CTRL *((volatile uint8_t *)(GCLK_BASE))
#define GCLK_STATUS *((volatile uint8_t *)(GCLK_BASE + 1))
#define GCLK_CLKCTRL *((volatile uint16_t *)(GCLK_BASE + 2))
#define GCLK_GENCTRL *((volatile uint32_t *)(GCLK_BASE + 4))
#define GCLK_GENDIV *((volatile uint32_t *)(GCLK_BASE + 8))
#define SYSCTRL_OSC8M *((volatile uint32_t *)(0x40000820))
#define SYSCTRL_OSC8M_ENABLE (1 << 1)
#define SYSCTRL_OSC8M_ONDEMAND (1 << 7)
#define SYSCTRL_OSC8M_PRESC_MASK (3 << 8)
#define SYSCTRL_OSC8M_RUNSTDBY (1 << 6)
#define SYSCTRL_PLLK_SR *((volatile uint32_t *)(0x4000080c))
#define PLLK_SR_OSC8M_RDY (1 << 3)
#define OSC8M_WAITBUSY() { while (!(SYSCTRL_PLLK_SR & (PLLK_SR_OSC8M_RDY))) {} }
#define SYSCTRL_DPLL (0x40000844)
#define SYSCTRL_DPLLCTRLA *((volatile uint8_t *)(0x40000844))
#define SYSCTRL_DPLLRATIO *((volatile uint32_t *)(0x40000848))
#define SYSCTRL_DPLLCTRLB *((volatile uint32_t *)(0x4000084C))
#define SYSCTRL_DPLLSTATUS *((volatile uint8_t *)(0x40000850))
#define DPLLCTRLA_ENABLE (1 << 1)
#define DPLLCTRLB_REFCLK_GCLK (1 << 5)
#define DPLLSTATUS_CLKRDY (1 << 1)
#define DPLLSTATUS_LOCK (1 << 0)
#define SYSCTRL_DPLLSTATUS_WAITLOCK() { while (!(SYSCTRL_DPLLSTATUS & (DPLLSTATUS_CLKRDY | DPLLSTATUS_LOCK))) {} }
#define PAC1_BASE (0x41000000)
#define PAC1_WPCLR *((volatile uint32_t *)(PAC1_BASE)) /* Register to clear write protection (unlock flash) */
#define PAC1_WPSET *((volatile uint32_t *)(PAC1_BASE + 4)) /* Register to set write protection (lock flash) */
#define PAC_WP_NVMCTL (1 << 1) /* Bit position for NVM in WPCLR/WPSET registers */
#define GCLK_WAITBUSY() { while (GCLK_STATUS & GCLK_STATUS_SYNCBUSY) {} }
void hal_init(void)
{
WDT_CTRL &= (~WDT_EN);
__asm__ volatile ("cpsid i");
uint32_t i, reg;
/* enable clocks for the power, sysctrl and gclk modules */
APBAMASK_REG = APBAMASK_PM_EN | APBAMASK_SYSCTRL_EN | APBAMASK_GCLK_EN;
/* set NVM wait states */
APBBMASK_REG |= APBBMASK_NVM_EN;
NVMCTRLB_REG |= ((WAITSTATES & 0x0f) << 1);
APBBMASK_REG &= ~APBBMASK_NVM_EN;
/* Set 8MHz oscillator */
reg = SYSCTRL_OSC8M & (~(SYSCTRL_OSC8M_PRESC_MASK | SYSCTRL_OSC8M_RUNSTDBY));
SYSCTRL_OSC8M = reg | SYSCTRL_OSC8M_ENABLE | SYSCTRL_OSC8M_ONDEMAND;
OSC8M_WAITBUSY();
/* Set PLL config */
GCLK_CTRL = GCLK_CTRL_RESET;
GCLK_WAITBUSY();
GCLK_GENDIV = (8 << GCLK_GENDIV_DIVSHIFT) | 1;
GCLK_GENCTRL = GCLK_GENCTRL_EN | GCLK_GENCTRL_SRC_OSC8M | 1;
GCLK_CLKCTRL = (1 << GCLK_CLKCTRL_GENSHIFT) | GCLK_CLKCTRL_CLKEN | 1;
GCLK_WAITBUSY();
SYSCTRL_DPLLRATIO = (47);
SYSCTRL_DPLLCTRLB = DPLLCTRLB_REFCLK_GCLK;
SYSCTRL_DPLLCTRLA = DPLLCTRLA_ENABLE;
SYSCTRL_DPLLSTATUS_WAITLOCK();
GCLK_GENDIV = (1 << GCLK_GENDIV_DIVSHIFT) | 0;
GCLK_GENCTRL = GCLK_GENCTRL_EN | GCLK_GENCTRL_SRC_FDPLL;
GCLK_WAITBUSY();
for (i = 3; i <= 34; i++) {
GCLK_CLKCTRL = GCLK_CLKCTRL_GEN_CLK7 | i;
GCLK_WAITBUSY();
}
}
void hal_prepare_boot(void)
{
/* Reset NVM wait states */
APBBMASK_REG |= APBBMASK_NVM_EN;
NVMCTRLB_REG &= ~((WAITSTATES & 0x0f) << 1);
APBBMASK_REG &= ~APBBMASK_NVM_EN;
/* Reset clock controller */
GCLK_CTRL = GCLK_CTRL_RESET;
GCLK_WAITBUSY();
}
int hal_flash_write(uint32_t address, const uint8_t *data, int len)
{
int i = 0;
uint32_t *src, *dst;
if (len <= 0)
return 0;
/* Clear page buffer */
NVMCTRLA_REG = (NVMCMD_PBC | NVMCMD_KEY);
while (i < len) {
if ((len - i > 3) && ((((address + i) & 0x03) == 0) && ((((uint32_t)data) + i) & 0x03) == 0)) {
dst = (uint32_t *)address;
src = (uint32_t *)data;
dst[i >> 2] = src[i >> 2];
i+=4;
} else {
uint32_t val;
uint8_t *vbytes = (uint8_t *)(&val);
uint32_t off = (address % 4);
dst = (uint32_t *)(address - off);
uint32_t dst_idx = (i + off) >> 2;
val = dst[dst_idx];
while (off < 4) {
if (i < len)
vbytes[off++] = data[i++];
else
off++;
}
dst[dst_idx] = val;
}
}
/* Enable write protection */
NVMCTRLA_REG = (NVMCMD_WP | NVMCMD_KEY);
return 0;
}
void hal_flash_unlock(void)
{
if (PAC1_WPSET & (PAC_WP_NVMCTL))
PAC1_WPCLR |= (PAC_WP_NVMCTL);
}
void hal_flash_lock(void)
{
if (PAC1_WPCLR & (PAC_WP_NVMCTL))
PAC1_WPSET |= (PAC_WP_NVMCTL);
}
int hal_flash_erase(uint32_t address, int len)
{
while (len > 0) {
NVMCTRL_ADDR = (address >> 1); /* This register holds the address of a 16-bit row */
NVMCTRLA_REG = NVMCMD_ERASE | NVMCMD_KEY;
while(!(NVMCTRL_INTFLAG & NVMCTRL_INTFLAG_NVMREADY))
len -= FLASH_PAGESIZE;
}
return 0;
}

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riotOS-samr21/fw-update/main.c 100644
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/* main.c
*
* Copyright (C) 2019 wolfSSL Inc.
*
* wolfBoot fw-update example RIOT application, running on samR21.
*
* wolfBoot is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfBoot is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
#include <stdio.h>
#include "net/ipv6/addr.h"
#include "net/gnrc.h"
#include "net/gnrc/netif.h"
#include "target.h"
#include "shell.h"
#include "wolfboot/wolfboot.h"
#include "hal.h"
#include "periph/flashpage.h"
extern void wolfBoot_success(void);
#define MSGSIZE (4 + 4 + 8)
#define PAGESIZE (256)
uint8_t page[PAGESIZE];
static uint32_t next_seq;
static uint32_t tot_len = 0;
const char err[]="!!!!";
static void reboot(void)
{
# define SCB_AIRCR (*((volatile uint32_t *)(0xE000ED0C)))
# define AIRCR_VECTKEY (0x05FA0000)
# define SYSRESET (1 << 2)
SCB_AIRCR = AIRCR_VECTKEY | SYSRESET;
}
static void ack(uint32_t _off)
{
uint32_t off = _off;
uint8_t ack_start = '#';
write(STDOUT_FILENO, &ack_start, 1);
write(STDOUT_FILENO, &off, 4);
}
static int check(uint8_t *pkt, int size)
{
int i;
uint16_t c = 0;
uint16_t c_rx = *((uint16_t *)(pkt + 2));
uint16_t *p = (uint16_t *)(pkt + 4);
for (i = 0; i < ((size - 4) >> 1); i++)
c += p[i];
if (c == c_rx)
return 0;
return -1;
}
static uint8_t msg[MSGSIZE];
static void update_loop(void)
{
int r;
uint32_t tlen = 0;
volatile uint32_t recv_seq;
uint32_t r_total = 0;
memset(page, 0xFF, PAGESIZE);
while (1) {
r_total = 0;
do {
while(r_total < 2) {
r = read(STDIN_FILENO, msg + r_total, 2 - r_total);
if (r <= 0)
continue;
r_total += r;
if ((r_total == 2) && ((msg[0] != 0xA5) || msg[1] != 0x5A)) {
r_total = 0;
continue;
}
}
r = read(STDIN_FILENO, msg + r_total, MSGSIZE - r_total);
if (r <= 0)
continue;
r_total += r;
if ((tot_len == 0) && r_total == 2 + sizeof(uint32_t))
break;
if ((r_total > 8) && (tot_len <= ((r_total - 8) + next_seq)))
break;
} while (r_total < MSGSIZE);
if (tot_len == 0) {
tlen = msg[2] + (msg[3] << 8) + (msg[4] << 16) + (msg[5] << 24);
if (tlen > WOLFBOOT_PARTITION_SIZE - 8) {
write(STDOUT_FILENO, err, 4);
break;
}
tot_len = tlen;
ack(0);
continue;
}
if (check(msg, r_total) < 0) {
ack(next_seq);
continue;
}
recv_seq = msg[4] + (msg[5] << 8) + (msg[6] << 16) + (msg[7] << 24);
if (recv_seq == next_seq)
{
int psize = r_total - 8;
int page_idx = recv_seq % PAGESIZE;
memcpy(&page[recv_seq % PAGESIZE], msg + 8, psize);
page_idx += psize;
if ((page_idx == PAGESIZE) || (next_seq + psize >= tot_len)) {
uint32_t dst = (WOLFBOOT_PARTITION_UPDATE_ADDRESS + recv_seq) / PAGESIZE;
flashpage_write_and_verify(dst, page);
memset(page, 0xFF, PAGESIZE);
}
next_seq += psize;
}
ack(next_seq);
if (next_seq >= tot_len) {
/* Update complete */
wolfBoot_update_trigger();
reboot();
while(1)
;
}
}
}
int main(void)
{
char x = '#';
puts("OTA example running on RIOT");
gnrc_netif_t *netif = NULL;
while ((netif = gnrc_netif_iter(netif))) {
ipv6_addr_t ipv6_addrs[GNRC_NETIF_IPV6_ADDRS_NUMOF];
int res = gnrc_netapi_get(netif->pid, NETOPT_IPV6_ADDR, 0, ipv6_addrs,
sizeof(ipv6_addrs));
if (res < 0) {
continue;
}
for (unsigned i = 0; i < (unsigned)(res / sizeof(ipv6_addr_t)); i++) {
char ipv6_addr[IPV6_ADDR_MAX_STR_LEN];
ipv6_addr_to_str(ipv6_addr, &ipv6_addrs[i], IPV6_ADDR_MAX_STR_LEN);
printf("IPv6 Link local address: %s\n", ipv6_addr);
ipv6_addrs[i].u8[0] = 0xFE;
ipv6_addrs[i].u8[1] = 0xC0;
ipv6_addrs[i].u8[2] = 0x00;
ipv6_addrs[i].u8[3] = 0x0a;
gnrc_netif_ipv6_addr_add(netif, &ipv6_addrs[i], 64, GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_VALID);
ipv6_addr_to_str(ipv6_addr, &ipv6_addrs[i], IPV6_ADDR_MAX_STR_LEN);
printf("IPv6 Site local address: %s\n", ipv6_addr);
}
}
printf("You are running RIOT on %s.\n", RIOT_BOARD);
printf("This board features a %s MCU.\n", RIOT_MCU);
printf("Boot address: 0x%08x\n", WOLFBOOT_PARTITION_BOOT_ADDRESS);
irq_disable();
wolfBoot_success();
irq_enable();
write(STDOUT_FILENO, &x, 1);
update_loop();
return 0;
}

1
riotOS-samr21/openocd.sh 100755
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sudo openocd -c 'source [find interface/cmsis-dap.cfg]' -f RIOT/boards/samr21-xpro/dist/openocd.cfg

16
riotOS-samr21/target.h 100644
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#ifndef H_TARGETS_TARGET_
#define H_TARGETS_TARGET_
/* Example flash partitioning.
* Ensure that your firmware entry point is
* at FLASH_AREA_IMAGE_0_OFFSET + 0x100
*/
#define WOLFBOOT_SECTOR_SIZE 0x100
#define WOLFBOOT_PARTITION_SIZE 0x1B000
#define WOLFBOOT_PARTITION_BOOT_ADDRESS 0x08000
#define WOLFBOOT_PARTITION_UPDATE_ADDRESS 0x23000
#define WOLFBOOT_PARTITION_SWAP_ADDRESS 0x3E000
#endif

66
riotOS-samr21/wolfboot.mk 100644
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ifdef WOLFBOOT_OFFSET
WOLFBOOT:=$(abspath $(RIOTBASE)/../../wolfBoot/)
CFLAGS += -I$(WOLFBOOT)/include
SIGNTOOL ?= $(WOLFBOOT)/tools/ed25519/ed25519_sign
KEYGENTOOL ?= $(WOLFBOOT)/tools/ed25519/ed25519_keygen
BINFILE ?= $(BINDIR)/$(APPLICATION).bin
SIGN_BINFILE = $(BINDIR)/$(APPLICATION).bin.v5.signed
WOLFBOOT_KEYFILE ?= $(WOLFBOOT)/ed25519.der
WOLFBOOT_BIN ?= $(WOLFBOOT)/wolfboot.bin
export IMAGE_HDR_SIZE ?= 256
wolfboot-create-key: $(WOLFBOOT_KEYFILE)
$(WOLFBOOT_KEYFILE):
make -C $(WOLFBOOT) clean
make -C $(WOLFBOOT) distclean
cp $(RIOTBASE)/../target.h $(WOLFBOOT)/include
make -C $(WOLFBOOT) TARGET=samr21 TARGET_ARCH= DEBUG=0 BOOT0_OFFSET=$(WOLFBOOT_OFFSET) ed25519.der
wolfboot: wolfboot-create-key link
@$(COLOR_ECHO)
@$(COLOR_ECHO) '$(COLOR_PURPLE)Re-linking for wolfBoot at $(WOLFBOOT_OFFSET)...$(COLOR_RESET)'
@$(COLOR_ECHO)
@$(COLOR_ECHO) 'sources:'
@$(COLOR_ECHO) $(SRC)
@$(COLOR_ECHO)
$(_LINK) $(LINKFLAGPREFIX)--defsym=_rom_start_addr="$$(($(WOLFBOOT_OFFSET) + $(IMAGE_HDR_SIZE)))" \
$(LINKFLAGPREFIX)--defsym=length="$$(($(WOLFBOOT_PARTITION_SIZE) - $(IMAGE_HDR_SIZE)))" \
$(LINKFLAGPREFIX)--defsym=image_header="$(IMAGE_HDR_SIZE)" -o $(ELFFILE) && \
$(OBJCOPY) $(OFLAGS) -Obinary $(ELFFILE) $(BINFILE) && \
$(SIGNTOOL) $(BINFILE) $(WOLFBOOT_KEYFILE) $(IMAGE_VERSION) $(WOLFBOOT_OFFSET)
@$(COLOR_ECHO)
@$(COLOR_ECHO) '$(COLOR_PURPLE)Signed with $(WOLFBOOT_KEYFILE) for version $(IMAGE_VERSION) \
$(COLOR_RESET)'
@$(COLOR_ECHO)
$(WOLFBOOT_BIN):
@$(COLOR_ECHO) 'sources:'
@$(COLOR_ECHO) $(SRC)
@$(COLOR_ECHO)
make -C $(WOLFBOOT) clean
cp $(RIOTBASE)/../target.h $(WOLFBOOT)/include
make -C $(WOLFBOOT) TARGET=samr21 TARGET_ARCH= DEBUG=0 BOOT0_OFFSET=$(WOLFBOOT_OFFSET) wolfboot.bin
.PHONY: wolfboot-flash-bootloader wolfboot-flash
wolfboot-flash-bootloader: HEXFILE = $(WOLFBOOT_BIN)
wolfboot-flash-bootloader: $(WOLFBOOT_BIN) $(FLASHDEPS)
sudo $(FLASHER) $(FFLAGS) -o 0x0
wolfboot-flash: HEXFILE = $(SIGN_BINFILE)
wolfboot-flash: wolfboot $(FLASHDEPS) wolfboot-flash-bootloader
sudo $(FLASHER) $(FFLAGS) -o $(WOLFBOOT_OFFSET)
else
wolfboot:
$(Q)echo "error: wolfboot not supported on board $(BOARD)!"
$(Q)false
endif # WOLFBOOT_OFFSET

2
wolfBoot

@ -1 +1 @@
Subproject commit a23627cfc2211035ec596ed6c1b19221653dc915
Subproject commit aa2abc8da2583b1433c8cbf4efebfabaaf173fa8