# Experimental port for Semtech SX1280 2.4 GHz Multi Protocol Controller
## Overview
This port targets the Semtech SX1280 radio controller. The Host Stack and the Controller (incl. Link Layer) run on a STM32 MCU, with the SX1280 connected via SPI.
It uses the SX1280 C-Driver from Semtech to communicate with the SX1280. The main modification was to provide an optimized polling SPI driver that is faster then the one provided by STM32CubeMX.
## Status
Only tested with the Miromico FMLR-80-P-STL4E module so far. On this module, the 52 Mhz clock for the SX1280 is controlled by the MCU.
Segger RTT is used for debug output, so a Segger J-Link programmer is required.
Uses 32.768 kHz crytstal as LSE for timing
Support for Broadcaster and Peripheral roles.
The current Makefile project compiles the gatt_counter.c example.
## Limitation
### Advertising State:
- Only advertises on Channel 37
- Advertises as fast as possible, back to back
- Only Connectable Advertising supported
- Only fixed public BD_ADDR of 33:33:33:33:33:33 is used
### Connection State:
- Only a single packet is sent in each Connection Interval
For the FMLR-80-P-STL4E module, just run make. You can upload the .elf file created in build folder e.g. with Ozone using the provided stm32-sx1280.jdebug and run it.
## TODO
### General
- advertise on all configured channels
- only advertise with advertising interval
- indicate random address in adertising pdus
- allow to set random BD_ADDR via HCI command
- handle Connection Param Update
- multiple packets per connection interval
- handle Encryption
## Low Power
- enter STANDY_RC mode when idle
- implement MCU sleep (if next wakeup isn't immediate)
- sleep after connection request until first packet from Central
- replace SysTick with tick counter based on LPTIM1
