Board: Mulle

The Mulle is a miniature wireless Embedded Internet System suitable for wireless sensors connected to the Internet of Things, and designed for rapid prototyping. It can be bought directly from Eistec AB.

• Official homepage
• Eistec wiki

Components

https://github.com/eistec/mulle/wiki/Datasheets contains a list of relevant documentation for the components.

MCU	MK60DN512VLL10 – Cortex-M4, 512 kB flash, 64kB RAM
radio chipset	AT86RF212B, sub-GHz IEEE802.15.4 transceiver, similar to the AT86RF233
external flash memory	Micron M25P16 16 Mbits external NOR flash, used for storing configuration, measurements and other slow changing non-volatile data
external FRAM memory	Cypress/Ramtron FM25L04B 4 Kbits external F-RAM, used for storing counters and other rapidly changing non-volatile data
accelerometer	ST micro LIS3DH MEMS accelerometer,

Layout

Implementation Status

Device	ID	Supported	Comments
MCU	MK60DN512VLL10	partly	See below
Low-level driver	GPIO	yes
	PWM	no	not started
	UART	yes	RX and TX works in examples/default using UART1, implemented but not tested other ports
	I2C	no	not started, first priority
	SPI	in progress	implemented core functionality, needs refactoring for PCS and CTAR config
	USB	no	not started
	RTT	in progress	untested, ported from Contiki
	RNG	no	not started
	hwtimer	yes	hwtimer uses LPTMR module for timer, 32.768 kHz tick rate
	timer	yes	in progress, uses PIT for additional timers, F_BUS tick rate (48 MHz default)
	LPM/LLWU	no	not started, will port some code from Contiki for low power modes
Radio Chip	AT86RF212B	no	waiting for refactoring work being done for the IoT_Lab-M3
Accelerometer	LIS3DH	no	will port from Contiki
Flash	M25P16	no	will port from Contiki
FRAM	FM25L04B	no	will port from Contiki

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.

Toolchains

See ARM Family, and Eistec wiki - Installing-toolchain (GCC)

Working:

• gcc-arm-embedded
• Clang 3.4, Clang 3.5 - Install procedure not documented but pretty straightforward (Gentoo: USE=multitarget), Makefiles and build system is fully functional with Clang.

Not working:

• Link time optimization (LTO) - Requires the GOLD linker, which currently fails on the K60 ldscripts. Needs refactoring of the ldscripts.

Programming and Debugging

See Eistec wiki.