Micro:bit hand assemble

This page describe how to make a program without programming environment.

Tool

• PC(Windows, Mac, Linux)
• Notebook
• Pencil
• Binary editor

Documents

https://infocenter.nordicsemi.com/pdf/nRF51822_PS_v3.3.pdf?cp=4_4_0_0

https://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf?cp=4_2_0

https://static.docs.arm.com/ddi0419/d/DDI0419D_armv6m_arm.pdf

https://github.com/bbcmicrobit/hardware/blob/master/SCH_BBC-Microbit_V1.3B.pdf

How to light LED

1. About hardware

First, we need to know about processor information which Micro:bit use.
https://tech.microbit.org/hardware/

2. Pin information

This document shows information that which pins connect to LEDs.

https://github.com/bbcmicrobit/hardware/blob/master/SCH_BBC-Microbit_V1.3B.pdf

These pins (P0.04 ~ P0.15) connected LEDs.

Instruction set

we know only three instruction sets.
LDR, STR and B. These information is needed when hand assemble.

https://static.docs.arm.com/ddi0419/d/DDI0419D_armv6m_arm.pdf

LDR (Load Register)

STR (Store)

B (Branch)

GPIO information

https://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf?cp=4_2_0

Vector table

https://static.docs.arm.com/ddi0419/d/DDI0419D_armv6m_arm.pdf

Stack pointer

https://github.com/lancaster-university/microbit-dal/blob/master/inc/core/MicroBitConfig.h#L47

Write assembly code !

Hand assemble !

Hand assemble ! Write offset address.

Hand assemble ! Write register information.

Hand assemble ! Complete hand assemble.

Make a program !

Download a program