# zig-bare-metal-microbit

See also [zig-bare-metal-raspberry-pi](https://github.com/markfirmware/zig-bare-metal-raspberry-pi) and [Awesome Zig Bootables](https://github.com/nrdmn/awesome-zig/blob/master/readme.md#Bootables)

* Displays "Z" on the leds
* Events from buttons A and B are broadcast on ble and when received are printed on the uart line

The goal is to replace the [ble buttons broadcaster](https://github.com/markfirmware/microbit-samples/blob/master/source/examples/blebuttonsbroadcaster/main.cpp) with zig on bare metal. This broadcaster is processed by [ultibo-ble-observer](https://github.com/markfirmware/ultibo-ble-observer/releases). Although it has no encryption, no privacy and no authentication, it is still useful for controlling a model railroad in a home or club setting, or at a demo.


* [microbit](https://tech.microbit.org)
    * [runtime - not used in this bare-metal project](https://lancaster-university.github.io/microbit-docs/#)
        * [led matrix display driver](https://github.com/lancaster-university/microbit-dal/blob/master/source/drivers/MicroBitDisplay.cpp)
    * [nrf51822](https://infocenter.nordicsemi.com/pdf/nRF51822_PS_v3.1.pdf)
    * [reference](https://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf)
    * [arm cortex-m0](https://developer.arm.com/ip-products/processors/cortex-m/cortex-m0)
        * [cortex m0 user's guide](https://static.docs.arm.com/dui0497/a/DUI0497A_cortex_m0_r0p0_generic_ug.pdf?_ga=2.60319917.1865497363.1577386349-160760379.1577386349)
    * [armv6m](https://static.docs.arm.com/ddi0419/e/DDI0419E_armv6m_arm.pdf?_ga=2.152616249.101383920.1573135559-619929151.1573135559)
    * [edge connector and pins](https://tech.microbit.org/hardware/edgeconnector)
    * [pin assignments (sheet 5 of schematic)](https://github.com/bbcmicrobit/hardware/blob/master/SCH_BBC-Microbit_V1.3B.pdf)