MSB-A2

Caution

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Tip

When using this board with RIOT, set the BOARD variable to msba2 in your Makefile. If you follow the standard RIOT project structure, your Makefile should look like this:

./Makefile

# name of your application
APPLICATION = hello-world

# Change this to your board if you want to build for a different board
BOARD ?= msba2

# This has to be the absolute path to the RIOT base directory:
RIOTBASE ?= $(CURDIR)/RIOT

include $(RIOTBASE)/Makefile.include

Support for the ScatterWeb MSB-A2 board

Overview

Hardware

MCU:	LPC2387 ARM7-TDMI
RAM:	96KiB
Flash:	512KiB

More info

Board Schematics

Circuit Diagrams

MSB-A2 page @ Freie Universität Berlin/CST

Flashing

The MSB-A2 is programmed via an ISP bootloader over UART. The board includes an FTDI USB-TTL converter, which is connected to the left USB Mini-B connector (see picture above). Connect the MSB-A2 using that connector to your PC and run from within the folder of your application to flash:

BOARD=msba2 make flash

You’ll notice that during the first invocation takes a bit longer, as the tool lpc2k_pgm used to flash the MSB-A2 is also compiled.

You can connect to the shell by running:

BOARD=msba2 make term

Debugging

Some rigorous hardware modification is needed to access the JTAG interface of the MSB-A2.

The following wires need to be soldered on:

Signal	Place
JTAG-TDO	IC2, Pin 1
JTAG-TDI	IC2, Pin 2
JTAG-TMS	IC2, Pin 3
JTAG-TRST	IC2, Pin 4
JTAG-TCK	IC2, Pin 5
JTAG-RTCK (*)	IC2, Pin 100
RESET	right pad of R6 (easier to solder) or IC2, Pin 17
GND	The bottom left through-hole pad

(*) You can safely omit the connection to JTAG-RTCK.

As debugger an FT2232HL is used, the cheapest version costs less 10€ (often nicknamed CJMCU-2232HL).

Connect as follows:

FT2232HL	MSB-A2
GND	GND
AD0	JTAG-TCK
AD1	JTAG-TDI
AD2	JTAG-TDO
AD3	JTAG-TMS
AD4	JTAG-TRST
AD5	RESET

Once this is done, debugging is as simple as running:

BOARD=msba2 make debug

Flashing via OpenOCD

Theoretically you should be able to flash also via JTAG. But do not expect this to be faster. Also: Do you really want to risk bricking the MSB-A2 you spend so much time to modify? The author of this text surely didn’t want to risk that…