Support for the fox board. More...

Detailed Description

Support for the fox board.


MCU ST2M32F103REY – 32-bits
Flash 512KiB
radio chipset AT86RF231
a IEEE802.15.4-compliant radio at 2.4 GHz

Implementation Status

Device ID Supported Comments
MCU STM23F103REY partly Energy saving modes not fully utilized
Low-level driver GPIO yes
PWM no
UART full
I2C yes
SPI yes one SPI device for now
USB no
RTT yes in progress
RNG no no HW module
Timer full
Radio Chip AT86RF231 partly will be remodelled soon

Note on at86rf231 radio driver

The current implementation of the radio driver for the at86rf231 chip uses the basic operation modes. This gives you basic sending and receiving functionality but no hardware address filtering and no auto-ACKs etc. Due to the fact this radio device is an IEEE 802.15.4 compliant device it supports radio channels from 11 to 26. When trying to set a channel out of range the driver returns an error and prints a message with DEVELHELP enabled.


See ARM Family

Working: gcc-arm-embedded gcc-linaro

Programming and Debugging

In order to program (flash) and debug the node you need OpenOCD and an ARM version of gdb (arm-none- eabi-gdb), which provided by most toolchains. Most Linux distributions provide also a package for OpenOCD. The required configuration files are provided by RIOT. When starting the debugger with make debug BOARD=fox GDB connects to openocd, loads the elf-file and puts the MCU into halt state. Before setting breakpoints it is sometimes needed to use the following workflow

monitor reset run
monitor reset halt
b <breakpoint>

For best debugging experience also change the -Os flag in Makefile.inlcude's CFLAGS variable to -O0.


For debugging you need to open a terminal. Here you simply have to call make debug - assuming that the current directory is your application directory. It establishes an openocd connection to the device and starts gdb connected to the openocd instance. For example, it should look something like this

[user@host RIOT]$ cd examples/default/
[user@host default]$ BOARD=fox make
Building application default for fox w/ MCU stm32f1.
[user@hostdefault]$ BOARD=fox make debug
RIOT/boards/hikob-common/dist/ RIOT/boards/fox/dist/gdb.conf
Open On-Chip Debugger 0.8.0 (2014-07-27-20:18)
Licensed under GNU GPL v2
For bug reports, read
GNU gdb (GNU Tools for ARM Embedded Processors)
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=x86_64-apple-darwin10 --target=arm-none-
For bug reporting instructions, please see:
Reading symbols from RIOT/examples/default/bin/fox/default.elf...done.
idle_thread (arg=<optimized out>) at RIOT/core/kernel_init.c:67
67 lpm_set(LPM_IDLE);
JTAG tap: stm32f1x.cpu tap/device found: 0x3ba00477 (mfg: 0x23b, part:
0xba00, ver: 0x3)
JTAG tap: tap/device found: 0x06414041 (mfg: 0x020, part: 0x6414,
ver: 0x0)
target state: halted
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x0800027c msp: 0x20002200
Loading section .text, size 0x6df4 lma 0x8000000
Loading section .ARM.exidx, size 0x8 lma 0x8006df4
Loading section .relocate, size 0x120 lma 0x8006dfc
Start address 0x8000000, load size 28444
Transfer rate: 11 KB/sec, 7111 bytes/write.
(gdb) c
void kernel_init(void)
Initializes scheduler and creates main and idle task.
void free(void *ptr)
This is a no-op.
Thread struct within mqtt paho.
Definition: paho_mqtt.h:177

The node will reboot and you can continue to use gdb like you're used to. In some cases it seems necessary to prepend a monitor reset run before executing continue. In general you can use openocd commands prepended by monitor. In the case the node crashes it can be reset with the following sequence

(gdb) monitor reset halt
(gdb) monitor reset run


For terminal output on OS X (make term) you need to install a driver:


file  board.h
 Board specific definitions for the fox board.
file  periph_conf.h
 Peripheral MCU configuration for the fox board.