# Basic concepts:

* ValueMutex
* PubSub, Publisher, Subscriber
* ValueManager
* LayeredReducer

# HAL

We use [Zephyr HAL](https://docs.zephyrproject.org/latest/reference/peripherals/index.html).

# OS

We use [CMSIS OS v2](https://www.keil.com/pack/doc/CMSIS_Dev/RTOS2/html/group__CMSIS__RTOS.html) for thread management and IPC.

# UI

* **[Input](API:Input)**

* **[Display](API:Display)**

* **[LED](API:LED)**

## vibro

* **[Sound](API:Sound)**

## backlight

# System

## batt voltage

## batt charge

# CC1101

## SPI

## IRQ

# SD Card

## SPI

# NFC

## SPI

## IRQ

# IR

## TX LED

## RX ADC

# RFID 125 kHz

## Carrier

## Pull

## Comparator RX (shared with touch key)

# Touch key

## Pull

## Comparator RX (shared with RFID 125 kHz)

# External GPIO

# External SPI

# External I2C

# UART

# USB

# BLE