IoT-LAB M3 open node

Support for the iotlab-m3 board. More...

Detailed Description

Support for the iotlab-m3 board.


MCU ST2M32F103REY – 32-bits, 64kB RAM
sensors Light (ISL29020)
Pressure (LPS331AP)
Tri-axis accelerometer/magnetometer (LSM303DLHC)
Tri-axis gyrometer (L3G4200D)
external memory 128 Mbits external Nor flash (N25Q128A13E1240F)
power 3,7V LiPo battery – 650 mAh (063040)
radio chipset AT86RF231
a IEEE802.15.4-compliant radio at 2.4 GHz

Board HW overview

IoT-LAB M3 Layout

Board Architecture

IoT-LAB M3 Architecture

Board schematics

, wiring, pinouts, etc...

Implementation Status

Device ID Supported Comments
MCU STM23F103REY partly Energy saving modes not fully utilized
Low-level driver GPIO yes
PWM no #4227
UART yes
I2C yes
SPI yes
USB no
RTT yes
Timer yes
Radio Chip AT86RF231 yes
Accelerometer L3G4200D yes
Magnetometer L3G4200D yes
Gyroscope LSM303DLHC yes
Pressure Sensor LPS331AP yes
Light Sensor ISL29020 yes


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=iotlab-m3 GDB connects to openocd, loads the elf-file and puts the MCU into halt state. Befor 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.


The M3 Open Node can reset, debug and program the STM32 on JTAG through the FTDI2322H connected to the USB. This component allows also a UART link to the STM32. The Open Node connector gives access to 3 STM32/GPIO and the STM32/I2C. Two power lines are accessible on this connector: a + 5.0 volts for the board power supply a 3.3 volts for the consumption monitoring of the STM32, the RF component and the sensors

The M3 Open Node can be used standalone without a gateway connected to the M3 Open node connector. The powering of the board is then assumed by a battery or by the USB connector The choice of the power input is done electronically (power management).

IoT-LAB M3 architecture


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=iotlab-m3 make
Building application default for iotlab-m3 w/ MCU stm32f1.
[user@hostdefault]$ BOARD=iotlab-m3 make debug
RIOT/boards/hikob-common/dist/ RIOT/boards/iotlab-m3/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/iotlab-m3/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

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 reseted 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  boards/iotlab-m3/include/board.h
 Board specific definitions for the iotlab-m3 board.
file  boards/iotlab-m3/include/periph_conf.h
 Peripheral MCU configuration for the iotlab-m3 board.